CT CrossTrainer Post Test! Hardest Trivia Quiz

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1/205 Questions

Which of the following should be done with a pediatric patient? 1. reduce the technique in order to minimize the dose. 2. decrease the amount of contrast media, proportional to the patient's body weight. 3. secure the patient's body in order to minimize motion.
- A. 1,2&3
- B. 1&2
- C. 1&3
- D. 2&3

About This Quiz

The CT CrossTrainer is a multiple choice post-test which includes questions related to fundamental physical concepts, jargons, and clinical imaging policy of Computed Tomography. This CT CrossTrainer quiz has been created to test and develop practical knowledge in clinical CT imaging. All questions are mandatory. Take your time and feel the pressure of the real exam. Let's take this challenging quiz. All the best!

CT CrossTrainer Post Test! Hardest Trivia Quiz - Quiz

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2.

What should be done if extravasation is noticed at the injection site?
- A. stop the injection
- B. apply heat during the injection
- C. slap the area
- D. apply ice during the injection
Correct Answer

A. A. stop the injection

Explanation

If extravasation is noticed at the injection site, it is important to stop the injection immediately. Extravasation refers to the leakage of medication from the blood vessels into the surrounding tissues. This can cause tissue damage, pain, and potential complications. By stopping the injection, further leakage and potential harm can be prevented. Applying heat, slapping the area, or applying ice during the injection would not address the issue of extravasation and could potentially worsen the situation.

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3.

When administering IV contrast media, which of the following is NOT acceptable sterile technique? 1. using dirty IV tubing. 2. using discolored contrast media. 3. continuing to wear the same gloves that were used with the previous patient.
- A. 1,2&3
- B. 2&3
- C. 1&3
- D. 1&2
Correct Answer

A. A. 1,2&3

Explanation

When administering IV contrast media, it is important to maintain sterile technique to prevent infection and ensure patient safety. Using dirty IV tubing (1), discolored contrast media (2), and continuing to wear the same gloves that were used with the previous patient (3) are all examples of unacceptable sterile techniques. Dirty IV tubing can introduce bacteria into the patient's bloodstream, discolored contrast media may indicate contamination or expiration, and wearing the same gloves increases the risk of cross-contamination between patients. Therefore, options 1, 2, and 3 are all not acceptable sterile techniques.

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4.

CT is commonly referred to as all of the following names EXCEPT:
- A. digital subtraction angiography
- B. computed tomography
- C. CAT-scan
- D. computerized axial tomography
Correct Answer

A. A. digital subtraction angiography

Explanation

CT, or computed tomography, is a medical imaging technique that uses X-rays and computer processing to create detailed cross-sectional images of the body. It is commonly referred to as computed tomography or CAT-scan. However, it is not referred to as digital subtraction angiography, which is a different imaging technique used specifically to visualize blood vessels by subtracting a pre-contrast image from a post-contrast image.

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1
5.

Patients are asked to hold their breath during a CT scan to:
- A. reduce the edge gradient artifact
- B. minimize motion artifacts and to avoid misregistration of slices
- C. keep the patient from touching the sides of the gantry
- D. minimize the amount of air in the lungs
Correct Answer

A. B. minimize motion artifacts and to avoid misregistration of slices

Explanation

During a CT scan, patients are asked to hold their breath to minimize motion artifacts and avoid misregistration of slices. When the patient breathes, there is movement in the chest and abdomen, which can cause blurring or distortion in the images. By holding their breath, the patient reduces this movement, resulting in clearer and more accurate images. Misregistration of slices can occur when there is movement between consecutive images, leading to misalignment and potential errors in diagnosis. Therefore, asking the patient to hold their breath helps to minimize these issues and improve the quality of the CT scan.

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6.

Which of the following imaging modalities uses ionizing radiation? 1. conventional radiography. 2. mammography. 3. computed tomography.
- A. 1,2&3
- B. 1&3
- C. 1&2
- D. 2&3
Correct Answer

A. A. 1,2&3

Explanation

Conventional radiography, mammography, and computed tomography all use ionizing radiation for imaging. Conventional radiography uses X-rays to produce images, mammography uses low-dose X-rays to examine the breasts, and computed tomography uses X-rays to create cross-sectional images of the body. Therefore, the correct answer is a. 1,2&3.

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7.

Archiving refers to which of the following?
- A. saving the images for long term storage
- B. converting from raw data to CT images
- C. a reduction in the number of x-ray photons in the x-ray beam
- D. detecting the x-ray photons after they have passed through the patient
Correct Answer

A. A. saving the images for long term storage

Explanation

Archiving refers to saving the images for long term storage. This means that the images are stored and preserved for future reference or retrieval. Archiving is typically done to ensure that the images are securely stored and can be accessed when needed, even after a long period of time. It allows for the preservation of important medical records and imaging data for patient care, research, and legal purposes.

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1
8.

The________provides the high voltage to the CT x-ray tube.
- A. high voltage generator
- B. host computer
- C. array processor
- D. scan controller
Correct Answer

A. A. high voltage generator

Explanation

The high voltage generator is responsible for providing the high voltage required for the CT x-ray tube. This is necessary in order to generate the necessary x-rays for the imaging process. The host computer, array processor, and scan controller are not directly involved in providing the high voltage for the x-ray tube.

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9.

Of the following, which contributes most to the shade of gray assigned to a pixel in a CT image?
- A. the heat capacity of the x-ray tube
- B. the x-ray attenuation properties of the tissue represented in the pixel
- C.whether the scanner is third- or fourth-generation
- D. the type of detectors used in the scanner
Correct Answer

A. B. the x-ray attenuation properties of the tissue represented in the pixel

Explanation

The shade of gray assigned to a pixel in a CT image is primarily determined by the x-ray attenuation properties of the tissue represented in the pixel. X-ray attenuation refers to the ability of different tissues to absorb x-rays to varying degrees. Tissues with higher attenuation properties will appear darker in the image, while tissues with lower attenuation properties will appear lighter. The heat capacity of the x-ray tube, the generation of the scanner, and the type of detectors used do not directly contribute to the shade of gray assigned to a pixel in a CT image.

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10.

Which of the following strategies can minimize metal artifacts? 1. remove as much metal from the patient as possible. 2. orient slices to avoid the metal. 3. inspect the localizer for any metal on the patient.
- A. 1,2&3
- B. 1&3
- C. 2&3
- D. 1&2
Correct Answer

A. A. 1,2&3

Explanation

Removing as much metal from the patient as possible, orienting slices to avoid the metal, and inspecting the localizer for any metal on the patient are all strategies that can minimize metal artifacts. By removing metal from the patient, such as jewelry or other metallic objects, the chances of metal artifacts appearing in the image are reduced. Orienting slices to avoid the metal ensures that the metal does not obstruct the area of interest and cause artifacts. Inspecting the localizer for any metal on the patient allows for adjustments to be made to avoid or minimize artifacts caused by the metal. Therefore, all three strategies can work together to minimize metal artifacts.

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11.

It is acceptable to perform a CT scan on a pregnant patient only:
- A. during the first trimester
- B. during the second trimester
- C. if the radiologist determines the benefit of the scan outweighs the risk to the patient
- D. if the technologist determines the scan is medically necessary
Correct Answer

A. C. if the radiologist determines the benefit of the scan outweighs the risk to the patient

Explanation

Performing a CT scan on a pregnant patient can pose risks to both the mother and the fetus. Therefore, it should only be done if the potential benefits of the scan outweigh the potential risks. This decision is typically made by a radiologist, who will evaluate the specific circumstances and medical needs of the patient before determining whether or not to proceed with the scan.

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12.

In the CT department the term "axial" is frequently used to reference which of the following orientations?
- A. sagittal
- B. transverse
- C. oblique images
- D. coronal
Correct Answer

A. B. transverse

Explanation

The term "axial" in the CT department refers to the transverse orientation. Axial images are obtained by taking slices of the body in a horizontal plane, perpendicular to the long axis of the body. This allows for a cross-sectional view of the structures being imaged. Sagittal refers to a vertical plane dividing the body into left and right halves, transverse refers to a horizontal plane dividing the body into upper and lower halves, oblique images are taken at an angle, and coronal refers to a vertical plane dividing the body into front and back halves.

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13.

Arrange MR imaging, CT imaging and plain film x-ray imaging in order from best to worst in their ability to differentiate soft tissues in the body:
- A. x-ray is better that CT is better than MRI
- B. MRI is better than CT is better than x-ray
- C. CT is better than MRI is better than x-ray
- D. x-ray is better than MRI is better than CT
Correct Answer

A. B. MRI is better than CT is better than x-ray

Explanation

MRI imaging is the best among the three options as it provides the highest level of detail and contrast resolution, allowing for excellent differentiation of soft tissues. CT imaging is the second-best option as it also provides good differentiation of soft tissues but with slightly lower resolution compared to MRI. Plain film x-ray imaging is the least effective in differentiating soft tissues as it has the lowest resolution and contrast, making it difficult to distinguish between different types of soft tissues.

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14.

Tungsten is used as the target material in a CT tube because it has a_____atomic weight and a_____melting point.
- A. high, high
- B. low, low
- C. high, low
- D. low, hig
Correct Answer

A. A. high, high

Explanation

Tungsten is used as the target material in a CT tube because it has a high atomic weight and a high melting point. The high atomic weight of tungsten allows for efficient x-ray production, as it can effectively interact with the electrons in the target material. Additionally, the high melting point of tungsten allows for the generation of high-energy x-rays without the risk of the target material melting or degrading. Therefore, using tungsten as the target material in a CT tube ensures optimal x-ray production and durability.

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15.

Which of the following is an advantage of a helical study compared to a conventional CT study? 1. can cover a given range of anatomy faster. 2. more coverage in a breath-hold. 3. minimal anatomical misregistration sometimes caused by inconsistent breath-holding.
- A. 1,2&3
- B. 1&3
- C. 1&2
- D. 2&3
Correct Answer

A. A. 1,2&3

Explanation

A helical study has several advantages compared to a conventional CT study. Firstly, it can cover a given range of anatomy faster, allowing for quicker imaging and reducing patient discomfort. Secondly, it provides more coverage in a breath-hold, meaning that a larger area can be imaged without the need for the patient to hold their breath multiple times. Lastly, a helical study minimizes anatomical misregistration that can be caused by inconsistent breath-holding, resulting in more accurate and reliable imaging. Therefore, all three options (1, 2, and 3) are advantages of a helical study.

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16.

The detectors:
- A. shield the patient from the x-rays
- B. produce the beam of x-rays
- C. increase the x-ray exposure of the film
- D. measure the x-rays that pass through the patient's body
Correct Answer

A. D. measure the x-rays that pass through the patient's body

Explanation

Detectors in medical imaging are used to measure the x-rays that pass through the patient's body. They are not involved in shielding the patient from x-rays, producing the beam of x-rays, or increasing the x-ray exposure of the film. Instead, detectors capture the x-rays that have passed through the patient, converting them into an electrical signal that can be used to create an image of the internal structures.

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17.

Things which are digital: 1. are less accurate than their analog counter parts. 2. can be electronically transported to remote locations. 3. are easily stored on a computer.
- A. 2 only
- B. 1&2
- C. 2&3
- D. 1 only
Correct Answer

A. C. 2&3

Explanation

Digital things can be electronically transported to remote locations because they can be easily converted into electronic signals and transmitted over networks. Additionally, digital things are easily stored on a computer because they can be saved as files or data on a storage device. This allows for convenient access, organization, and retrieval of digital content.

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18.

CT systems:
- A. utilize radio waves
- B. utilize ionizing radiation
- C. have no moving parts
- D. are limited to scanning strictly in the transverse orientation
Correct Answer

A. B. utilize ionizing radiation

Explanation

CT systems utilize ionizing radiation to create detailed images of the body's internal structures. Ionizing radiation is used because it has the ability to penetrate through the body and interact with the tissues, creating a contrast in the images. This allows for the detection of abnormalities, such as tumors or fractures, that may not be visible with other imaging techniques. However, it is important to note that the use of ionizing radiation carries potential risks, such as an increased risk of cancer, which should be carefully considered and balanced against the potential benefits of the CT scan.

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19.

CT images which are NOT strictly transverse can be directly acquired by:
- A. shielding the patient
- B. tilting the gantry
- C. collimating the x-ray beam
- D. turning the x-ray tube
Correct Answer

A. B. tilting the gantry

Explanation

CT images are typically acquired in a transverse plane, meaning that the patient is positioned horizontally on the table and the x-ray beam is directed perpendicular to the patient's body. However, in certain cases, it may be necessary to acquire images in a different plane. One way to do this is by tilting the gantry, which allows the x-ray beam to be directed at an angle other than perpendicular. By tilting the gantry, images can be obtained in oblique or coronal planes, providing additional information for diagnosis.

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20.

A first-generation scanner:
- A. used a curved array of detectors
- B. produced an image in less than 5 seconds
- C. used multiple detectors
- D. used a pencil beam of x-rays
Correct Answer

A. D. used a pencil beam of x-rays

Explanation

A first-generation scanner used a pencil beam of x-rays. This means that the scanner emitted a thin, focused beam of x-rays that would pass through the body and be detected on the other side. This method allowed for the creation of an image by measuring the amount of x-rays that were able to pass through different tissues.

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21.

The CT x-ray tube:
- A. measures the x-ray information coming from the patient
- B. moves the patient table during the scan
- C. produces the beam of x-rays
- D. shields the patient from the x-rays
Correct Answer

A. C. produces the beam of x-rays

Explanation

The CT x-ray tube produces the beam of x-rays used in the scan. It is responsible for generating the x-rays that pass through the patient's body and create the images. The tube contains a heated filament that emits electrons, which are then accelerated towards a metal target. When the electrons collide with the target, they produce x-rays. Therefore, option c is the correct answer as it accurately describes the function of the CT x-ray tube.

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1
22.

Continuously without stopping and incrementally, stopping at discrete positions, are typical movements of the__________through the gantry.
- A. detector array
- B. CT tube
- C. patient table
- D. DAC
Correct Answer

A. C. patient table

Explanation

The correct answer is c. patient table. The question is asking about the typical movements of something through the gantry. The gantry is a part of a CT scanner that houses the X-ray tube and detector array. The X-ray tube and detector array are stationary and do not move during the scan. The patient table, on the other hand, moves continuously and incrementally through the gantry, stopping at discrete positions to capture images of different sections of the body. Therefore, the patient table is responsible for the continuous and incremental movements through the gantry.

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1
23.

What control does the operator have over the x-rays in a CT exam?
- A. temperature and color of the x-rays can be tuned
- B. volume and tone of the x-rays can be dialed
- C.energy level and quantity of x-rays can be selected
- D. phase and frequency of the x-rays can be adjusted
Correct Answer

A. C.energy level and quantity of x-rays can be selected

Explanation

The operator has control over the energy level and quantity of x-rays in a CT exam. This means they can adjust the strength of the x-rays and determine how many x-rays are used during the exam. This control is important because it allows the operator to customize the imaging process based on the specific needs of the patient and the area being examined.

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1
24.

The____controls the energy level of the x-ray photons and the____controls the number of x-ray photons emitted from the tube.
- A. mA,mA
- B. kV,mA
- C. mA,kV
- D. kV,kV
Correct Answer

A. B. kV,mA

Explanation

The explanation for the correct answer is that the kV (kilovolt) controls the energy level of the x-ray photons, while the mA (milliamperes) controls the number of x-ray photons emitted from the tube. The kV determines the penetration power of the x-rays, while the mA determines the quantity or intensity of the x-rays produced. Therefore, the combination of kV and mA allows for control over both the quality and quantity of the x-ray beam.

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25.

In order for an x-ray photon to be measured it must: 1. produce a measurable event. 2. collide with a detector atom. 3. enter the detector.
- A. 1,2&3
- B. 1&2
- C. 1&3
- D. 2&3
Correct Answer

A. A. 1,2&3

Explanation

To measure an x-ray photon, it must first produce a measurable event, such as interacting with matter. Then, it must collide with a detector atom, which allows for the detection of the photon. Finally, it must enter the detector in order to be measured. Therefore, all three conditions must be met for an x-ray photon to be measured.

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26.

Which of the following is NOT a function of a PACS system?
- A. long term data storage
- B. reconstruction of the image from the raw data
- C. digital distribution of images
- D. image display for the radiologists
Correct Answer

A. B. reconstruction of the image from the raw data

Explanation

A PACS system, or Picture Archiving and Communication System, is used for the storage, distribution, and display of medical images. It allows for long term data storage, digital distribution of images, and image display for radiologists. However, the reconstruction of the image from the raw data is not a function of a PACS system. This process is typically done by the imaging equipment itself, such as an MRI or CT scanner, before the image is sent to the PACS system for storage and distribution.

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27.

A CT artifact is:
- A. a parameter used to control the brightness of the image
- B. an anomaly in the CT image
- C. always a reason to call for repair of the CT scanner
- D. used to time the injection of contrast media
Correct Answer

A. B. an anomaly in the CT image

Explanation

A CT artifact refers to an anomaly in the CT image. It is an unintended distortion or interference that can occur during the imaging process, resulting in abnormalities or inconsistencies in the final image. These artifacts can be caused by various factors such as patient movement, equipment malfunction, or imaging technique. Identifying and understanding these artifacts is crucial for accurate interpretation of CT images and to ensure the quality of diagnostic information provided.

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28.

Which of the following affects beam hardening? 1. the energies of the photons in the x-ray beam. 2. the thickness of the tissues penetrated by the x-ray beam. 3. the types of tissues penetrated by the x-ray beam.
- A. 1&2
- B. 1,2&3
- C. 2&3
- D. 1&3
Correct Answer

A. B. 1,2&3

Explanation

Beam hardening is a phenomenon that occurs in computed tomography (CT) imaging where the x-ray beam becomes harder (i.e., higher energy) as it passes through a patient's body. This is caused by the preferential absorption of lower energy photons by the tissues, resulting in a higher proportion of higher energy photons remaining in the beam. Therefore, all three factors mentioned in the options can affect beam hardening. The energies of the photons in the x-ray beam, the thickness of the tissues penetrated, and the types of tissues penetrated can all contribute to the degree of beam hardening.

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29.

Which of the following may be the cause of a metal artifiact? 1. a zipper on the patient's clothing. 2. jewelry. 3. dental fillings.
- A. 1&2
- B. 1&3
- C. 2&3
- D. 1,2&3
Correct Answer

A. D. 1,2&3

Explanation

The correct answer is d. 1,2&3. All three options, a zipper on the patient's clothing, jewelry, and dental fillings, can cause a metal artifact. Metal artifacts can be seen on medical imaging scans such as X-rays or MRI scans and can interfere with the quality of the image. Zippers, jewelry, and dental fillings are all made of metal and can create a bright or dark spot on the image, making it difficult to interpret. Therefore, all three options can be potential causes of a metal artifact.

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30.

For a 5 cc/sec IV contrast injection, on a patient with good veins, for a CTA study, which of the following is the best choice?
- A. 18 gauge catheter
- B. 21 gauge catheter
- C. you will have equal success with all of these
- D. butterfly needle
Correct Answer

A. A. 18 gauge catheter

Explanation

An 18 gauge catheter is the best choice for a 5 cc/sec IV contrast injection on a patient with good veins for a CTA study. A larger gauge catheter allows for a faster flow rate, which is important for delivering the contrast agent quickly and efficiently. This size catheter is less likely to cause resistance or occlusion, ensuring a smooth injection process. The other options, a 21 gauge catheter and a butterfly needle, have smaller gauges and may not allow for the desired flow rate. Therefore, the 18 gauge catheter is the most suitable choice.

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31.

Which of the following will increase the number of x-ray photons produced by the CT x-ray tube?
- A. decreased mA
- B. increased mA
- C. decreased kV
- D. increased kV
Correct Answer

A. B. increased mA

Explanation

Increasing the mA (milliamperage) will increase the number of x-ray photons produced by the CT x-ray tube. mA is a measure of the current passing through the tube, and increasing it will result in more electrons being accelerated across the tube, leading to an increase in the number of x-ray photons generated.

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32.

Collimators: 1. reduce scatter radiation. 2. restrict the path of the x-ray beam. 3. minimize the x-ray dose to the patient.
- A. 1&3
- B. 1,2&3
- C. 1&2
- D. 2&3
Correct Answer

A. B. 1,2&3

Explanation

Collimators are devices used in radiography to restrict the path of the x-ray beam. They are designed to reduce scatter radiation, which can be harmful to both the patient and the healthcare professional operating the equipment. By limiting the size and shape of the x-ray beam, collimators also help to minimize the x-ray dose to the patient. Therefore, the correct answer is b. 1,2&3.

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33.

If we want to accentuate the bony detail on a case of ankle trauma,________reconstruction filter would be the best choice.
- A. no
- B. a sharp
- C. a multiplanar
- D. a smooth
Correct Answer

A. B. a sharp

Explanation

A sharp reconstruction filter enhances the edges and details in an image, making them more prominent and defined. In the case of ankle trauma, using a sharp filter would help accentuate the bony detail, allowing for better visualization and analysis of the injury. This filter would be the best choice as it would provide a clear and detailed image of the bones in the ankle, aiding in diagnosis and treatment planning.

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34.

A CTA study requires:
- A. an overnight hospital stay
- B. intrathecal contrast
- C. extra patient preparation compared to a typical CT exam
- D. IV constrast
Correct Answer

A. D. IV constrast

Explanation

A CTA study requires IV contrast because it is used to enhance the blood vessels and provide better visualization of the structures being examined. This contrast material is injected into the patient's veins through an IV line, allowing the radiologist to see the blood vessels more clearly and detect any abnormalities or blockages. Unlike intrathecal contrast, which is injected into the spinal canal, IV contrast does not require an overnight hospital stay or extra patient preparation.

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35.

Which of the following are settings on a power injector? 1. kV. 2. flow rate. 3. amount of contrast administered.
- A. 3 only
- B. 1 only
- C. 2 only
- D. 2&3
Correct Answer

A. D. 2&3

Explanation

The correct answer is d. 2&3. This is because the settings on a power injector include the flow rate (option 2) and the amount of contrast administered (option 3). The kV (option 1) is not a setting on a power injector.

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36.

Which of the following events is responsible for changing the raw data into image data?
- A. attenuation
- B. ionization
- C. reconstruction
- D. reconversion
Correct Answer

A. C. reconstruction

Explanation

Reconstruction is the process responsible for changing raw data into image data. This involves taking the collected raw data, such as X-ray measurements, and using algorithms and mathematical techniques to convert it into a visual representation, such as a medical image. Attenuation refers to the reduction of intensity of a signal, ionization refers to the process of removing electrons from atoms, and reconversion is not a recognized term in this context.

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37.

Through which component are most of the commands from the technologist entered?
- A. ADC
- B. array processor
- C. amplifier
- D. operator's console
Correct Answer

A. D. operator's console

Explanation

Most of the commands from the technologist are entered through the operator's console. The operator's console is a component that allows the technologist to interact with the system and input commands. It provides a user interface where the technologist can control and monitor the system's operations. This component is essential for managing and operating the system effectively.

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38.

Which of the following is NOT on the inside of the CT x-ray tube?
- A. filament
- B. rotating anode
- C. collimator
- D. tungsten target
Correct Answer

A. C. collimator

Explanation

The collimator is not on the inside of the CT x-ray tube. A collimator is a device that helps control the size and shape of the x-ray beam that is emitted from the tube. It is usually located outside the tube, near the exit point of the x-ray beam. The filament, rotating anode, and tungsten target are all components that are found inside the x-ray tube and play a role in generating and focusing the x-ray beam.

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39.

The main purpose of the detector is to:
- A. amplify the measured signal
- B. collimate the x-ray beam before it enters the patient's body
- C. generate a measurable signal from captured x-ray photons
- D. limit the x-ray dose to the patient
Correct Answer

A. C. generate a measurable signal from captured x-ray photons

Explanation

The main purpose of the detector is to generate a measurable signal from captured x-ray photons. This means that the detector is responsible for converting the x-ray photons that pass through the patient's body into an electrical signal that can be measured and used to create an image. The detector plays a crucial role in the imaging process by capturing the x-ray photons and converting them into a form that can be analyzed and interpreted by medical professionals.

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40.

If the x-ray tube is positioned directly above a supine patient(lying face up) during a localizer scan, what type of localizer image will result?
- A. transverse
- B. AP
- C. oblique
- D. lateral
Correct Answer

A. B. AP

Explanation

If the x-ray tube is positioned directly above a supine patient during a localizer scan, an AP (anterior-posterior) localizer image will result. This is because the x-ray beam will pass from the anterior (front) to the posterior (back) of the patient's body, capturing an image from that perspective.

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41.

Which of the following would result if no reconstruction filter was used in the image reconstruction process? 1. tissues in the resulting images would have blurry edges. 2. the resulting images would appear speckled, or grainy. 3. the resulting image would be inverted.
- A. 1&2
- B. 2&3
- C. 2 only
- D. 1 only
Correct Answer

A. A. 1&2

Explanation

If no reconstruction filter is used in the image reconstruction process, the resulting images would have blurry edges (option 1) and appear speckled or grainy (option 2). The reconstruction filter helps to smooth out the image and reduce noise, resulting in clearer and more defined edges. Without the filter, the image would lack sharpness and have an increased presence of noise, causing both blurry edges and a speckled or grainy appearance.

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42.

Which of the following would reduce the viscosity of an IV contrast agent?
- A. cooling
- B. shaking
- C. warming
- D. stirring
Correct Answer

A. C. warming

Explanation

Warming would reduce the viscosity of an IV contrast agent because increasing the temperature of a substance typically decreases its viscosity. As the temperature rises, the molecules within the contrast agent gain more energy and move more quickly, causing them to spread out and flow more easily. This results in a lower viscosity, making the contrast agent less resistant to flow. Cooling, shaking, and stirring would not have the same effect and may even increase the viscosity of the contrast agent.

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43.

For typical CT exams of the abdomen:
- A. oral contrast agents are never used
- B. IV contrast agents are never used
- C. neither IV nor oral contrast agents are used
- D. both IV and oral contrast agents are often used together
Correct Answer

A. D. both IV and oral contrast agents are often used together

Explanation

For typical CT exams of the abdomen, both IV and oral contrast agents are often used together. This is because IV contrast agents help enhance the blood vessels and organs in the abdomen, providing better visualization of the structures. Oral contrast agents, on the other hand, help to highlight the gastrointestinal tract, allowing for better differentiation between the organs and surrounding tissues. By using both types of contrast agents, radiologists can obtain more detailed and accurate images of the abdomen, aiding in the diagnosis of various conditions and diseases.

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44.

The material in the CT x-ray tube which is bombarded with electrons and which gives off x-rays photons is known as the:
- A. detector
- B. target
- C.electrical brushes
- D. power supply
Correct Answer

A. B. target

Explanation

The material in the CT x-ray tube that is bombarded with electrons and emits x-ray photons is known as the "target." When high-speed electrons collide with the target material, they transfer their energy, causing the emission of x-ray photons. The target material is usually made of a heavy metal, such as tungsten, due to its high atomic number and ability to withstand the heat generated during the process. The x-ray photons produced by the target material are then used for imaging purposes in CT scans.

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1
45.

Collimation:
- A. is accomplished by physically blocking x-rays
- B. converts attenuation information into a form which can be used by computer components
- C. is used to reconstruct the CT images
- D. is the process of bombarding the cathode with electrons to produce the x-ray beam
Correct Answer

A. A. is accomplished by physically blocking x-rays

Explanation

Collimation refers to the process of restricting the size and shape of the x-ray beam. It is achieved by physically blocking or limiting the radiation emitted from the x-ray tube. This is typically done using a lead collimator, which has adjustable shutters that can be used to shape and restrict the x-ray beam to the desired area of interest. By blocking the x-rays that are not needed for imaging, collimation helps to reduce patient exposure to radiation and improve image quality by reducing scatter radiation.

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46.

The array processor:
- A. reduces the amount of scatter radiation
- B. greatly increases the strength of the detected attenuation information
- C. reconstructs the CT images from the raw data
- D. produces the x-ray beam
Correct Answer

A. C. reconstructs the CT images from the raw data

Explanation

The correct answer is c. The array processor reconstructs the CT images from the raw data. This means that the array processor takes the raw data obtained from the CT scanner and processes it to generate the final CT images. The raw data includes information about the attenuation of X-rays as they pass through different tissues in the body. The array processor uses mathematical algorithms to convert this raw data into detailed cross-sectional images that can be used for diagnosis and treatment planning.

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47.

The CT number of water is:
- A. +100
- B. 0
- C. -1000
- D. -100
Correct Answer

A. B. 0

Explanation

The CT number of water is 0 because water has a density similar to that of soft tissues in the body, which are assigned a CT number of 0. CT numbers are used to measure the attenuation of X-rays as they pass through different substances, and water is often used as a reference point for comparison.

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48.

Which of the following affects the patient dose? 1. rotation time. 2. anatomical coverage. 3. pitch.
- A. 1,2&3
- B. 1&3
- C. 2&3
- D. 1&2
Correct Answer

A. A. 1,2&3

Explanation

Rotation time, anatomical coverage, and pitch all affect the patient dose. Rotation time refers to the time it takes for the imaging equipment to complete a full rotation around the patient. A longer rotation time can increase the patient dose. Anatomical coverage refers to the area of the patient's body that is being imaged. A larger anatomical coverage can result in a higher patient dose. Pitch refers to the distance the table moves per rotation of the imaging equipment. A higher pitch can lead to a higher patient dose. Therefore, all three factors (rotation time, anatomical coverage, and pitch) affect the patient dose.

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49.

Which of the following is a valid method to prepare the basilic vein for IV contrast administration? 1. apply a tourniquet to the upper arm. 2. have the patient make a fist. 3. slap the vein briskly.
- A. 1&2
- B. 1,2&3
- C. 1&3
- D. 2&3
Correct Answer

A. B. 1,2&3

Explanation

To prepare the basilic vein for IV contrast administration, it is necessary to apply a tourniquet to the upper arm, have the patient make a fist, and slap the vein briskly. Applying a tourniquet helps to distend the vein and make it more visible and accessible for insertion. Having the patient make a fist helps to engorge the veins and make them easier to palpate. Slapping the vein briskly can help dilate the vein and make it easier to cannulate. Therefore, all three methods are valid and should be used in combination to prepare the basilic vein for IV contrast administration.

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CT CrossTrainer Post Test! Hardest Trivia Quiz

Which of the following should be done with a pediatric patient? 1. reduce the technique in order to minimize the dose. 2. decrease the amount of contrast media, proportional to the patient's body weight. 3. secure the patient's body in order to minimize motion.

Quiz Preview

What should be done if extravasation is noticed at the injection site?

When administering IV contrast media, which of the following is NOT acceptable sterile technique? 1. using dirty IV tubing. 2. using discolored contrast media. 3. continuing to wear the same gloves that were used with the previous patient.

CT is commonly referred to as all of the following names EXCEPT:

Patients are asked to hold their breath during a CT scan to:

Which of the following imaging modalities uses ionizing radiation? 1. conventional radiography. 2. mammography. 3. computed tomography.

Archiving refers to which of the following?

The________provides the high voltage to the CT x-ray tube.

Of the following, which contributes most to the shade of gray assigned to a pixel in a CT image?

Which of the following strategies can minimize metal artifacts? 1. remove as much metal from the patient as possible. 2. orient slices to avoid the metal. 3. inspect the localizer for any metal on the patient.

It is acceptable to perform a CT scan on a pregnant patient only:

In the CT department the term "axial" is frequently used to reference which of the following orientations?

Arrange MR imaging, CT imaging and plain film x-ray imaging in order from best to worst in their ability to differentiate soft tissues in the body:

Tungsten is used as the target material in a CT tube because it has a_____atomic weight and a_____melting point.

Which of the following is an advantage of a helical study compared to a conventional CT study? 1. can cover a given range of anatomy faster. 2. more coverage in a breath-hold. 3. minimal anatomical misregistration sometimes caused by inconsistent breath-holding.

The detectors:

Things which are digital: 1. are less accurate than their analog counter parts. 2. can be electronically transported to remote locations. 3. are easily stored on a computer.

CT systems:

CT images which are NOT strictly transverse can be directly acquired by:

A first-generation scanner:

The CT x-ray tube:

Continuously without stopping and incrementally, stopping at discrete positions, are typical movements of the__________through the gantry.

What control does the operator have over the x-rays in a CT exam?

The____controls the energy level of the x-ray photons and the____controls the number of x-ray photons emitted from the tube.

In order for an x-ray photon to be measured it must: 1. produce a measurable event. 2. collide with a detector atom. 3. enter the detector.

Which of the following is NOT a function of a PACS system?

A CT artifact is:

Which of the following affects beam hardening? 1. the energies of the photons in the x-ray beam. 2. the thickness of the tissues penetrated by the x-ray beam. 3. the types of tissues penetrated by the x-ray beam.

Which of the following may be the cause of a metal artifiact? 1. a zipper on the patient's clothing. 2. jewelry. 3. dental fillings.

For a 5 cc/sec IV contrast injection, on a patient with good veins, for a CTA study, which of the following is the best choice?

Which of the following will increase the number of x-ray photons produced by the CT x-ray tube?

Collimators: 1. reduce scatter radiation. 2. restrict the path of the x-ray beam. 3. minimize the x-ray dose to the patient.

If we want to accentuate the bony detail on a case of ankle trauma,________reconstruction filter would be the best choice.

A CTA study requires:

Which of the following are settings on a power injector? 1. kV. 2. flow rate. 3. amount of contrast administered.

Which of the following events is responsible for changing the raw data into image data?

Through which component are most of the commands from the technologist entered?

Which of the following is NOT on the inside of the CT x-ray tube?

The main purpose of the detector is to:

If the x-ray tube is positioned directly above a supine patient(lying face up) during a localizer scan, what type of localizer image will result?

Which of the following would result if no reconstruction filter was used in the image reconstruction process? 1. tissues in the resulting images would have blurry edges. 2. the resulting images would appear speckled, or grainy. 3. the resulting image would be inverted.

Which of the following would reduce the viscosity of an IV contrast agent?

For typical CT exams of the abdomen:

The material in the CT x-ray tube which is bombarded with electrons and which gives off x-rays photons is known as the:

Collimation:

The array processor:

The CT number of water is:

Which of the following affects the patient dose? 1. rotation time. 2. anatomical coverage. 3. pitch.

Which of the following is a valid method to prepare the basilic vein for IV contrast administration? 1. apply a tourniquet to the upper arm. 2. have the patient make a fist. 3. slap the vein briskly.

Tungsten is used as the target material in a CT tube because it has a_atomic weight and a_melting point.

Thecontrols the energy level of the x-ray photons and thecontrols the number of x-ray photons emitted from the tube.