Medical CT Registry Exam Review MCQ Test!

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  • 1/76 Questions

    Which of the following are benefits of narrower section thicknesses?

    • Reduced partial volume averaging and improved spatial resolution
    • Decreased scan time, and more anatomy covered
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About This Quiz


Try this Medical CT registry exam review MCQ test that we've prepared below for you. This CT registry review test is designed for technologists who need to prepare and pass the CT certification exam. You must already know that computed tomography (CT) is an imaging procedure that uses special x-ray equipment to create detailed scans of areas inside the body. Test your understanding of this concept by taking the quiz below and acing that upcoming final exam!

Medical CT Registry Exam Review MCQ Test! - Quiz

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  • 2. 

    What helical or spiral computed tomography term is defined as the table increment in distance per mm per 360 degrees gantry rotation divided by the section thickness in mm?

    • Rotation

    • Spiral

    • Helix

    • Pitch

    Correct Answer
    A. Pitch
    Explanation
    Pitch is the term that is defined as the table increment in distance per mm per 360 degrees gantry rotation divided by the section thickness in mm. In helical or spiral computed tomography, pitch refers to the distance the table moves per one complete rotation of the gantry. It is an important parameter that determines the speed at which the scanner acquires images and affects the image quality and radiation dose. A higher pitch value indicates a faster scan but lower image quality, while a lower pitch value provides better image quality but slower scan speed.

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  • 3. 

    Statistical noise appears as ___ on a CT image

    • Decreased contrast

    • Increased brightness

    • Concentric circles

    • Graininess

    Correct Answer
    A. Graininess
    Explanation
    Statistical noise refers to random variations in pixel values that can occur in CT images. This noise appears as graininess on the image. It is caused by factors such as low radiation dose, low signal-to-noise ratio, or technical limitations of the CT scanner. The graininess can reduce image quality and make it more challenging to interpret the image accurately.

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  • 4. 

    How often should an average CT number water calibration test be performed?

    • Daily

    • Monthly

    • Yearly

    • Weekly

    Correct Answer
    A. Daily
    Explanation
    An average CT number water calibration test should be performed daily to ensure accurate and consistent results. This frequent testing helps to calibrate the CT scanner and maintain the accuracy of the CT number measurements. By performing the calibration test daily, any changes or drifts in the CT scanner's performance can be detected and corrected promptly, ensuring reliable and high-quality imaging.

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  • 5. 

    The matrix size describes which of the following?

    • Aperture size used during data acquistion

    • Number of pixels used to display an image

    • Relationship between the field of view and algorithm

    Correct Answer
    A. Number of pixels used to display an image
    Explanation
    The matrix size refers to the number of pixels used to display an image. A matrix is a grid of pixels, and the size of the matrix determines the resolution of the image. A larger matrix size means more pixels and higher resolution, resulting in a clearer and more detailed image. Therefore, the matrix size directly affects the quality and clarity of the displayed image.

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  • 6. 

    Which two strategies can reduce the effect of dental fillings in a sinus study?

    • High mA and short scan time.

    • Low kVp and high contrast, or bone algorithm.

    • Adjust the angle of the gantry and widen the window width.

    • Small focal spot and small display field.

    Correct Answer
    A. Adjust the angle of the gantry and widen the window width.
  • 7. 

    Which of the following will magnify the image?

    • Increase the field of view.

    • Decreasing field of view.

    • Increasing section thickness.

    • Decreasing section thickness.

    Correct Answer
    A. Decreasing field of view.
    Explanation
    Decreasing the field of view will magnify the image because a smaller field of view allows for a closer and more detailed view of the object. When the field of view is decreased, the same amount of information is concentrated into a smaller area, resulting in a magnified image.

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  • 8. 

    What term is used to describe the computed tomography appearance of an intracerebral hemorrhage as a result of a higher CT number of the hemorrhage as compared to normal brain tissue?

    • Hyperdense

    • Isodense

    • Hypodense

    • Mass effect

    Correct Answer
    A. Hyperdense
    Explanation
    Hyperdense is the correct answer because it refers to the computed tomography appearance of an intracerebral hemorrhage where the hemorrhage appears brighter or denser on the CT scan compared to normal brain tissue. This is due to the higher CT number of the hemorrhage, indicating a higher density of blood in the area. Isodense refers to when the hemorrhage has a similar density to normal brain tissue, hypodense refers to when the hemorrhage appears darker or less dense than normal brain tissue, and mass effect refers to the displacement or compression of brain tissue by the hemorrhage.

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  • 9. 

    The term used to descibe the ability of a fluid to flow is

    • Density

    • Viscosity

    • Osmolality

    • Specific gravity

    Correct Answer
    A. Viscosity
    Explanation
    Viscosity is the correct answer as it is the term used to describe the ability of a fluid to flow. Viscosity refers to the internal friction or resistance to flow within a fluid. It is a measure of how thick or sticky a fluid is, and it determines how easily the fluid can be poured or moved. Different fluids have different viscosities, with some being more viscous (thicker) and others less viscous (thinner).

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  • 10. 

    Which of the following section widths would cause the greatest amount of partial volume averaging?

    • 1mm

    • 3mm

    • 5mm

    • 10mm

    Correct Answer
    A. 10mm
    Explanation
    A larger section width would cause a greater amount of partial volume averaging. This is because a wider section width would include more adjacent tissues and structures within the same voxel, leading to an averaging of their signal intensities. Therefore, a section width of 10mm would cause the greatest amount of partial volume averaging compared to section widths of 1mm, 3mm, and 5mm.

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  • 11. 

    What filter selection would provide the best detail for imaging of the internal auditory canals?

    • Smooth

    • Sharp

    • Standard

    • Soft

    Correct Answer
    A. Sharp
    Explanation
    The filter selection that would provide the best detail for imaging of the internal auditory canals is "sharp." A sharp filter enhances the edges and fine details in an image, which is crucial for accurately visualizing the intricate structures of the internal auditory canals. Smooth, standard, and soft filters are not as effective in enhancing details and may result in a less clear and accurate image of the canals.

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  • 12. 

    A patient has a severe vagal reaction to iodinated contrast material that includes bradycardia.  Initial treatment may include

    • Atropine

    • Diazapam

    • Rantidine hyrochloride (Zantac)

    • Albuterol sulfate (Proventil)

    Correct Answer
    A. Atropine
    Explanation
    A severe vagal reaction to iodinated contrast material can cause bradycardia, which is a slow heart rate. Atropine is a medication that can be used to increase heart rate by blocking the action of the vagus nerve, which slows down the heart. Therefore, atropine would be an appropriate initial treatment for this patient to counteract the bradycardia caused by the vagal reaction. Diazepam is a sedative and would not directly address the bradycardia. Ranitidine hydrochloride is an antacid and would also not be effective for treating bradycardia. Albuterol sulfate is a bronchodilator and would not have a direct effect on heart rate.

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  • 13. 

    What is an advantage of scans of the pituitary taken in the coronal plane?

    • IV contrast material is better visualized.

    • Streak artifacts are reduced or eliminated.

    • The patient is more comfortable during scanning.

    • The patient receives a lower radiation dose.

    Correct Answer
    A. Streak artifacts are reduced or eliminated.
    Explanation
    Scans of the pituitary taken in the coronal plane have the advantage of reducing or eliminating streak artifacts. Streak artifacts are unwanted streaks or lines that can appear on an image due to various factors such as metal objects, dense tissues, or motion. By taking scans in the coronal plane, which is a vertical plane that divides the body into front and back halves, the likelihood of streak artifacts is minimized. This allows for clearer and more accurate visualization of the pituitary gland, leading to better diagnostic outcomes.

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  • 14. 

    Which of the following is convolution?

    • Filtered back projection

    • Fourier transform

    • Iterative filtration

    • 3-d rendering

    Correct Answer
    A. Filtered back projection
    Explanation
    Filtered back projection is a mathematical technique used in computed tomography (CT) imaging to reconstruct an image from a series of x-ray projections. It involves convolving the projections with a filter function before back projecting them to form the final image. Convolution is a mathematical operation that combines two functions to produce a third function that represents how one function affects the other. In the case of filtered back projection, the convolution is performed between the projections and the filter function, making it the correct answer.

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  • 15. 

    What is the name of the pinecone-shaped structure of the brain the can often be seen as calcified in CT images?

    • Choroid Plexus

    • Pineal Gland

    • Caudate Nucleus

    • Middle cerebral Artery

    Correct Answer
    A. Pineal Gland
    Explanation
    The pineal gland is a small pinecone-shaped structure located in the brain. It is often seen as calcified in CT images, which means that it can appear as a white, dense area on the scan. The pineal gland plays a role in regulating sleep patterns and producing melatonin, a hormone that helps control the sleep-wake cycle. Its calcification can sometimes be associated with certain disorders or conditions, such as pineal gland tumors or calcium deposits.

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  • 16. 

    Which of the following is a streak artifact oriented tangentially to a flat surface having a high spatial frequency?

    • Low contrast artifact

    • Edge gradient artifact

    • Equipment induced artifact

    • Signal artifact

    Correct Answer
    A. Edge gradient artifact
    Explanation
    The correct answer is "edge gradient artifact." An edge gradient artifact is a streak artifact that occurs tangentially to a flat surface with a high spatial frequency. This artifact is caused by abrupt changes in pixel intensity along the edges of an object, resulting in streaks or lines appearing in the image. It is important to be aware of this artifact as it can affect the accuracy and interpretation of the image.

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  • 17. 

    The average CT value for blood is approximately

    • -50 HU

    • 0 HU

    • +45 HU

    • +100 HU

    Correct Answer
    A. +45 HU
    Explanation
    The Hounsfield Unit (HU) is a scale used in computed tomography (CT) to measure the density of a substance. A CT value of +45 HU for blood indicates that blood has a density higher than water, but lower than bone. This is expected since blood contains various components, such as red and white blood cells, plasma, and platelets, which contribute to its density. Therefore, +45 HU is a reasonable average CT value for blood.

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  • 18. 

    During CT angiography, images may be reconstructed using only the greastest density encountered along each ray.  This type of specialized CT image is called a(n)

    • 3 demensional model

    • Volume-rendered model

    • MIP image

    • Surface-rendered image

    Correct Answer
    A. MIP image
    Explanation
    During CT angiography, images may be reconstructed using only the greatest density encountered along each ray. This technique is known as Maximum Intensity Projection (MIP). In MIP images, the highest intensity values are displayed, which allows for better visualization of blood vessels and other structures with high contrast. MIP images are commonly used in angiography to highlight the vessels and provide a clearer representation of their anatomy.

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  • 19. 

    The mathematical technique that involves the estimation of an unknown value from values on either side of it its known as

    • Filtering

    • Interpolation

    • Convolution

    • Summation

    Correct Answer
    A. Interpolation
    Explanation
    Interpolation is the correct answer because it refers to the mathematical technique of estimating an unknown value based on known values on either side of it. It involves creating a function or curve that passes through the given data points and using this function to find the value at the desired point. Interpolation is commonly used in various fields such as mathematics, statistics, computer science, and engineering.

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  • 20. 

    Which of the following reconstruction methods is used by most modern CT scanners?

    • Back-projection

    • Iterative methods

    • Fourier tranform

    • Filtered back-projection

    Correct Answer
    A. Filtered back-projection
    Explanation
    Filtered back-projection is the most commonly used reconstruction method in modern CT scanners. This method involves taking multiple X-ray projections of the patient from different angles and then applying a filtering process to remove noise and artifacts. The filtered projections are then back-projected to create a 2D image of the scanned area. This method is preferred because it produces high-quality images with minimal artifacts and is computationally efficient compared to other methods such as iterative methods or Fourier transform.

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  • 21. 

    Which of the following determines the maximum number of shades of gray that can be displayed on the CT monitors?

    • Window level

    • Window width

    • Pixel size

    • Matrix size

    Correct Answer
    A. Window width
    Explanation
    The maximum number of shades of gray that can be displayed on CT monitors is determined by the window width. Window width refers to the range of Hounsfield units that are displayed on the monitor. A wider window width allows for a larger range of shades of gray to be displayed, resulting in more detailed and nuanced images. On the other hand, a narrower window width will limit the number of shades of gray that can be displayed, resulting in a less detailed image.

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  • 22. 

    Which of the following is the term used to describe a voxel value that is the average of multiple tissue types contained within the voxel?

    • Linear attenuation coefficient.

    • Partial volume averaging.

    • Low contrast resolution.

    • Edge gradient averaging.

    Correct Answer
    A. Partial volume averaging.
    Explanation
    Partial volume averaging is the term used to describe a voxel value that is the average of multiple tissue types contained within the voxel. This occurs when a voxel contains a mixture of different tissues, and the resulting voxel value represents an average of the different tissue densities. This phenomenon can lead to a loss of spatial resolution and can affect the accuracy of measurements and diagnoses in medical imaging.

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  • 23. 

    The interaction between xray and matter that is responsible for the production of the scatter radiation absorbed by the patient and detectors is

    • Compton interaction

    • Bremsstrahlung interaction

    • Photoelectric effect

    • Characteristic interaction

    Correct Answer
    A. Compton interaction
    Explanation
    The correct answer is Compton interaction. Compton interaction occurs when an x-ray photon interacts with an outer shell electron in an atom, causing the photon to scatter and lose energy. This scattered radiation can be absorbed by the patient and detectors. The other options, bremsstrahlung interaction, photoelectric effect, and characteristic interaction, are also interactions between x-rays and matter, but they do not specifically refer to the production of scatter radiation absorbed by the patient and detectors.

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  • 24. 

    Which fo the following is the central value in a range of gray shades used to display the image?

    • Window width

    • Window level

    • Region of interest

    • Dose index

    Correct Answer
    A. Window level
    Explanation
    The central value in a range of gray shades used to display an image is referred to as the window level. This value determines the brightness or intensity of the image. By adjusting the window level, the user can control the overall brightness of the image, making it easier to visualize specific structures or abnormalities.

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  • 25. 

    Third generation (rotate/rotate) scanners overcame which of the following limitations?

    • Detector singal drift sensitivity

    • Translation motion

    • Spurious signals from moving signal wires

    • Cost

    Correct Answer
    A. Translation motion
    Explanation
    Third generation (rotate/rotate) scanners overcame the limitation of translation motion. Translation motion refers to the linear movement of the scanner, which can cause blurring and distortions in the scanned image. Third generation scanners, with their rotating mechanism, eliminated the need for translation motion, resulting in more accurate and high-quality scans.

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  • 26. 

    What term is used to describe as the ability to display an image of a large object that is only slightly different in density from its surroundings?

    • Spatial resolution

    • Contrast resolution

    • Linearity

    • Clarity

    Correct Answer
    A. Contrast resolution
    Explanation
    Contrast resolution is the term used to describe the ability to display an image of a large object that is only slightly different in density from its surroundings. This means that the imaging technique has the capability to distinguish and visualize subtle differences in density or contrast between different tissues or structures in the body.

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  • 27. 

    What anatomical structure forms a roof over the posterior cranial fossa and is shaped like a tent?

    • Tentorium cerebelli

    • Falx cerebri

    • Pontine cistern

    • Pia mater

    Correct Answer
    A. Tentorium cerebelli
    Explanation
    The tentorium cerebelli is an anatomical structure that forms a roof over the posterior cranial fossa. It is shaped like a tent, with a horizontal portion separating the cerebellum from the occipital lobes of the brain. This structure provides support and protection to the brain, preventing downward displacement of the cerebellum. It also helps to compartmentalize the different regions of the brain, separating the cerebellum from the cerebral hemispheres.

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  • 28. 

    Which of the following interactions between xray and matter results in the largest amount of occupational exposure?

    • Characteristic effect

    • Compton effect

    • Bremsstrahlung effect

    • Photoelectric effect

    Correct Answer
    A. Compton effect
    Explanation
    The Compton effect is the correct answer because it involves the scattering of X-ray photons by the electrons in matter. This scattering can cause the X-ray photons to lose energy and change direction, resulting in a larger amount of occupational exposure. The other options, such as the characteristic effect, Bremsstrahlung effect, and photoelectric effect, also involve interactions between X-rays and matter but do not result in as much occupational exposure as the Compton effect.

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  • 29. 

    Before a CT image can be reconstructed by a computer, the transmission signal produced by the detectors must be converted into numeric information by a(n)

    • Kernel

    • Analog-to-digital converter

    • Array processor

    • Digital-to-analog converter

    Correct Answer
    A. Analog-to-digital converter
    Explanation
    An analog-to-digital converter is necessary to convert the transmission signal produced by the detectors in a CT scan into numeric information. This is because the detectors measure the intensity of the X-ray beams that pass through the body, which is an analog signal. The analog-to-digital converter converts this analog signal into digital data that can be processed by the computer to reconstruct the CT image.

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  • 30. 

    Which of the following will help to reduce partial volume artifacts?

    • Scanning thinner sections

    • Scanning thicker sections

    • Scanning using a higher technique

    • Scanning using a lower technique

    Correct Answer
    A. Scanning thinner sections
    Explanation
    Scanning thinner sections can help to reduce partial volume artifacts because when the sections are thinner, there is less overlap of different tissues within each voxel. This reduces the mixing of signals from different tissues, resulting in a more accurate representation of each individual tissue type. Consequently, the image will have improved spatial resolution and less blurring, leading to a reduction in partial volume artifacts.

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  • 31. 

    The type of filter used at the xray tube of a CT scanner is called a

    • Kernel

    • Water bath

    • Bow-tie filter

    • Wedge filter

    Correct Answer
    A. Bow-tie filter
    Explanation
    A bow-tie filter is used at the x-ray tube of a CT scanner. This filter is shaped like a bow-tie and is designed to reduce the amount of radiation that reaches the patient's body. It helps to shape the x-ray beam and ensures that the radiation is distributed evenly across the patient's body. This filter is important in CT scanning as it helps to reduce image artifacts and improve image quality.

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  • 32. 

    What determines the section thickness?

    • Scan arc

    • Filtration algorithm

    • Incident beam collimation

    • Detector alignment

    Correct Answer
    A. Incident beam collimation
    Explanation
    The section thickness is determined by the incident beam collimation. Incident beam collimation refers to the process of narrowing down the size of the beam before it interacts with the sample. By controlling the collimation, the size of the beam can be adjusted, which in turn affects the section thickness. A narrower beam will result in a thinner section, while a wider beam will result in a thicker section. Therefore, incident beam collimation plays a crucial role in determining the section thickness.

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  • 33. 

    What type of drug is Demerol?

    • Analgesic

    • Antipyretic

    • Antianxiety agent

    • Local anesthetic

    Correct Answer
    A. Analgesic
    Explanation
    Demerol is classified as an analgesic drug. Analgesics are medications that are used to relieve pain. They work by blocking or reducing the sensation of pain in the body. Demerol, also known as meperidine, is a synthetic opioid analgesic that is commonly used to treat moderate to severe pain. It acts on the central nervous system to alleviate pain by binding to opioid receptors in the brain and spinal cord. As an analgesic, Demerol does not have antipyretic (fever-reducing), antianxiety, or local anesthetic properties.

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  • 34. 

    Which of the following is a solid-state device used to record the light flashes given off by a scintillation crystal?

    • Photomultiplier tube

    • Anode

    • Photodiode

    • Input phosphor

    Correct Answer
    A. Photodiode
    Explanation
    A photodiode is a solid-state device used to record the light flashes given off by a scintillation crystal. It is a type of semiconductor device that converts light into an electrical current. When light strikes the photodiode, it generates a current proportional to the intensity of the light. This current can be measured and recorded, making the photodiode an ideal choice for detecting and recording the light flashes produced by a scintillation crystal.

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  • 35. 

    Which of the following is the recommended percentage of barium in a barium sulfate suspension utilized in abdominal computed tomography?

    • 1-3%

    • 10-20%

    • 30%

    • 50%

    Correct Answer
    A. 1-3%
    Explanation
    The recommended percentage of barium in a barium sulfate suspension utilized in abdominal computed tomography is 1-3%. This concentration range is commonly used because it provides sufficient contrast for imaging while minimizing the risk of adverse effects or complications. Higher concentrations may lead to a higher risk of side effects such as diarrhea or constipation, while lower concentrations may result in inadequate visualization of the gastrointestinal tract. Therefore, a concentration of 1-3% is considered optimal for abdominal CT scans.

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  • 36. 

    Which of the following is the correct order for the stages of infection?

    • Incubation, prodomal, active, convalescence

    • Convalescence, active, prodomal, incubation

    • Prodomal, incubation, convalescence, active

    • Incubation, convalescence, prodomal, active

    Correct Answer
    A. Incubation, prodomal, active, convalescence
    Explanation
    The correct order for the stages of infection is as follows: incubation, prodomal, active, convalescence. During the incubation stage, the pathogen enters the body and starts to multiply. The prodomal stage is characterized by the onset of non-specific symptoms such as fever and fatigue. The active stage is when the infection is at its peak, with specific symptoms and the highest level of pathogen replication. Finally, the convalescence stage is the recovery period, where the symptoms gradually subside and the body returns to its normal state.

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  • 37. 

    Which of the following is not commonly used as a CT scintillation detector material?

    • Ceramic rare earth

    • Silver halide

    • Bismuth germinate

    • Cadmium tungstate

    Correct Answer
    A. Silver halide
    Explanation
    Silver halide is not commonly used as a CT scintillation detector material. CT scintillation detectors are typically made from materials that can efficiently convert X-ray photons into visible light, such as ceramic rare earth, bismuth germinate, and cadmium tungstate. Silver halide, on the other hand, is commonly used in photographic films but not as a scintillation detector material in CT scans.

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  • 38. 

    Areas of a CT image that contain minimal changes in tissue density are electronically represented by 

    • Positive CT numbers

    • High spatial frequencies

    • Negative CT numbers

    • Low spatial frequencies

    Correct Answer
    A. Low spatial frequencies
    Explanation
    Low spatial frequencies in a CT image represent areas that contain minimal changes in tissue density. Spatial frequency refers to the number of changes in pixel intensity across an image. Low spatial frequencies indicate a smooth transition in tissue density, suggesting minimal changes or uniformity in the image. In contrast, high spatial frequencies represent areas with rapid changes in pixel intensity, indicating variations in tissue density. Therefore, low spatial frequencies are electronically represented by the given answer.

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  • 39. 

    Which of the following will have an effect on image quality?

    • Spatial resolution

    • Contrast resolution

    • Noise

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Spatial resolution, contrast resolution, and noise all have an effect on image quality. Spatial resolution refers to the ability to distinguish between two objects that are close together, and a higher spatial resolution results in a clearer and more detailed image. Contrast resolution relates to the ability to differentiate between different shades of gray, and a higher contrast resolution leads to better visualization of subtle differences in tissue density. Noise refers to random variations in image intensity, and high levels of noise can reduce image clarity and make it difficult to identify structures. Therefore, all three factors play a crucial role in determining the quality of an image.

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  • 40. 

    Where is contrast media introduced for a myelography exam of the spinal canal?

    • Subdural space

    • Epidural space

    • Subarachnoid space

    • Spinal cord

    Correct Answer
    A. Subarachnoid space
    Explanation
    Contrast media is introduced into the subarachnoid space for a myelography exam of the spinal canal. This space is located between the arachnoid mater and the pia mater, which surround the spinal cord. By injecting contrast media into the subarachnoid space, it can flow around the spinal cord and help visualize any abnormalities or blockages in the spinal canal. The subdural space is located between the dura mater and the arachnoid mater, the epidural space is located outside the dura mater, and the spinal cord is the structure within the spinal canal.

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  • 41. 

    Which of the following anatomical structures would be visualized first when obtaining sagittal sections from right to left?

    • C-loop of the duodenum

    • Tail of the pancreas

    • Gallbladder

    • Right kidney

    Correct Answer
    A. Gallbladder
    Explanation
    When obtaining sagittal sections from right to left, the first anatomical structure that would be visualized is the gallbladder. Sagittal sections are taken in a vertical plane that divides the body into right and left halves. The gallbladder is located on the right side of the abdomen, close to the liver. Therefore, it would be the first structure encountered when moving from the right side to the left side of the body.

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  • 42. 

    Which of the following describes rapid, irregular, ineffective twitches of the ventricles?

    • Ventricular regurgitation

    • Ventricular palpitations

    • Ventricular arrythmia

    • Ventricular fibrillation

    Correct Answer
    A. Ventricular fibrillation
    Explanation
    Ventricular fibrillation is a condition characterized by rapid, irregular, and ineffective twitches of the ventricles. During ventricular fibrillation, the heart's electrical signals become chaotic, causing the ventricles to quiver instead of contracting normally. This results in the heart being unable to pump blood effectively, leading to a lack of oxygen supply to the body. Ventricular fibrillation is a life-threatening condition that requires immediate medical intervention, such as defibrillation, to restore the heart's normal rhythm.

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  • 43. 

    Which of the following terms defines the increase in the mean energy of a polychromatic beam as it passes through an object?

    • Partial volume effect

    • Beam hardening

    • Cross-field uniformity

    • Linearity

    Correct Answer
    A. Beam hardening
    Explanation
    Beam hardening refers to the increase in the mean energy of a polychromatic beam as it passes through an object. This occurs because the lower energy photons are preferentially absorbed, resulting in a higher proportion of higher energy photons in the beam. This phenomenon can cause artifacts in computed tomography (CT) images, where the attenuation values of the object may be inaccurately represented due to the beam hardening effect.

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  • 44. 

    What change will occur in the number of detected photons if a section thickness is changed from 5 mm to 10mm?

    • Decrease 50%

    • Decrease 25%

    • Increase 50%

    • Increase 100%

    Correct Answer
    A. Increase 100%
    Explanation
    If the section thickness is changed from 5 mm to 10 mm, the number of detected photons will increase by 100%. This is because the thicker section allows for more photons to interact with the detector, resulting in a higher number of photons being detected.

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  • 45. 

    What is the primary type of interaction that contributes to the subject contrast in CT images?

    • Pair production

    • Photoelectric effect

    • Compton scattering

    • Linear attenuation

    Correct Answer
    A. Compton scattering
    Explanation
    Compton scattering is the primary type of interaction that contributes to the subject contrast in CT images. Compton scattering occurs when an incoming X-ray photon interacts with an outer shell electron in the subject, causing the photon to change direction and lose some of its energy. This scattering process leads to variations in the intensity of X-rays detected by the CT scanner, which ultimately contributes to the contrast seen in the resulting images.

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  • 46. 

    Which of the following is the primary interaction between xray photons and tissue during CT examinations?

    • Bremsstrahlung effect

    • Characteristic effect

    • Compton effect

    • Coherent scatter

    Correct Answer
    A. Compton effect
    Explanation
    The primary interaction between x-ray photons and tissue during CT examinations is the Compton effect. This occurs when an x-ray photon interacts with an outer shell electron in the tissue, causing the photon to scatter in a different direction and lose some of its energy. This interaction is important in CT imaging as it contributes to the formation of the image by providing information about the density and composition of the tissue being examined.

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  • 47. 

    An image that is reconstructed a second time with some change in technical factor is termed _____.

    • Reiterated

    • Post-processed

    • Retrospective

    • Reformatted

    Correct Answer
    A. Retrospective
    Explanation
    Retrospective refers to the act of looking back or reflecting on past events or experiences. In the context of the question, when an image is reconstructed a second time with some change in technical factors, it can be considered a retrospective action as it involves revisiting and modifying the image after its initial creation. The term "retrospective" accurately describes this process and aligns with the given scenario.

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  • 48. 

    What type of scan geometry is responsible for producing ring artifacts?

    • Translate-rotate

    • Rotate-rotate

    • Rotate only

    • Helical / spiral

    Correct Answer
    A. Rotate-rotate
    Explanation
    Rotate-rotate scan geometry is responsible for producing ring artifacts. In this type of scan geometry, the X-ray tube and detector rotate continuously around the patient in the same direction. This results in incomplete data acquisition and uneven sampling, leading to ring artifacts in the reconstructed images. These artifacts appear as concentric rings or circular patterns, causing image distortion and reducing image quality.

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  • 49. 

    The abdominal aorta bifurcates at the level of

    • T10

    • T12

    • L2

    • L4

    Correct Answer
    A. L4
    Explanation
    The correct answer is L4. The abdominal aorta bifurcates at the level of L4 into the right and left common iliac arteries. This is an important anatomical landmark as it marks the transition from the abdominal aorta to the pelvis and lower extremities.

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Quiz Review Timeline (Updated): Oct 16, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Oct 16, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 21, 2009
    Quiz Created by
    Akuhlman
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