Computed Tomography Quiz Test! Trivia

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Computed Tomography Quiz Test! Trivia - Quiz


Do you know anything about computer tomography? Computed tomography refers to a computerized x-ray imaging procedure. A narrow beam of x-rays is directed at the patient and quickly rotated around the body, producing signals processed by the machine’s computer to create cross-sectional images of the body. Take this quiz and see how much you know about computed tomography.


Questions and Answers
  • 1. 

    What are the advantages of scans of the pituitary taken in the coronal plane?

    • A.

      IV contrast material is better visualized

    • B.

      Streak aritfacts are reduced or eliminated

    • C.

      The PT is more comfortable during scanning

    • D.

      The PT receives a lower dose of radiation

    Correct Answer
    B. Streak aritfacts 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 lines or streaks that can appear on the image, often caused by dense structures or metallic objects. By using the coronal plane, which is a vertical slice from front to back, these artifacts are minimized or removed, resulting in a clearer and more accurate image of the pituitary gland. This allows for better visualization and interpretation of the scan.

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  • 2. 

    Which of the following is true concerning CT studies of the musculoskeletal system?

    • A.

      IV contrast is never necessary

    • B.

      A single bone window is adequate for most studies

    • C.

      When possible, the normal side should be examined, with the two sides placed symmetrically

    • D.

      Slice thickness is typically 1-2mm and never exceeds 3mm

    Correct Answer
    C. When possible, the normal side should be examined, with the two sides placed symmetrically
    Explanation
    When possible, the normal side should be examined, with the two sides placed symmetrically. This means that when conducting CT studies of the musculoskeletal system, it is important to compare the affected side with the normal side to identify any abnormalities or differences. By examining both sides symmetrically, it allows for a more accurate assessment and comparison of the musculoskeletal structures.

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  • 3. 

    A typical presentation of an abcess on an contrast enhanced CT study is

    • A.

      That the abscess remains entirely unaffected by the contrast material and presents as a low attenuatioin area

    • B.

      A low attenuation are surrounded by a ring of enhancement

    • C.

      A high attenuation are because the contrast pools in the abcess, often creating clear fluid levels

    • D.

      That the following contrast enhancement, the abcess becomes isodense with the surrounding tissue

    Correct Answer
    B. A low attenuation are surrounded by a ring of enhancement
    Explanation
    The correct answer is that a typical presentation of an abscess on a contrast-enhanced CT study is a low attenuation area surrounded by a ring of enhancement. This means that the abscess appears as a darker area with reduced density compared to the surrounding tissue, and it is surrounded by a brighter ring of increased density due to the contrast material. This pattern is commonly seen in abscesses and helps to differentiate them from other types of lesions or fluid collections.

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  • 4. 

    When is it essential to perform a precontracted study on the abdomen along with the post-contrast images.

    • A.

      When the PT has a history of HEP B

    • B.

      When the contrasted exam is performed by injection at a high flow rate with the use of a mechanical injector and the scans are performed in the spiral mode

    • C.

      When the entire liver cannot be imaged before equilibrium phase

    • D.

      When the PT has a history of CHF.

    Correct Answer
    C. When the entire liver cannot be imaged before equilibrium phase
    Explanation
    Performing a precontracted study on the abdomen along with the post-contrast images is essential when the entire liver cannot be imaged before the equilibrium phase. This is because the precontrast study helps in identifying any abnormalities or lesions in the liver that may not be clearly visible in the post-contrast images alone. By comparing the precontrast and post-contrast images, a more accurate diagnosis can be made.

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  • 5. 

    Enhancement of most brain lesions is due to

    • A.

      The intrinsic vascularity of the brain

    • B.

      The high subject contrast inherent in the brain

    • C.

      The disruption of the blood brain barrier

    • D.

      Their unique ability to resist IV contrast media

    Correct Answer
    C. The disruption of the blood brain barrier
    Explanation
    The enhancement of most brain lesions is due to the disruption of the blood brain barrier. The blood brain barrier is a protective barrier that prevents certain substances from entering the brain tissue. When there is damage or inflammation in the brain, the blood brain barrier can become compromised, allowing contrast agents to leak into the brain tissue. This leakage causes the lesions to appear enhanced on imaging studies, making them more visible and easier to detect.

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  • 6. 

    Pleural effusion can be defined as

    • A.

      Fluid in the pericardial cavity, between the visceral and parietal pericardia

    • B.

      An accumulation of serous fluid in the peritoneal cavity

    • C.

      A local generalized condition in which the body tissue contain an excessive amount of tissue fluid

    • D.

      The escape of fluid into the thoracic cavity, between the visceral and parietal pleurae

    Correct Answer
    D. The escape of fluid into the thoracic cavity, between the visceral and parietal pleurae
    Explanation
    Pleural effusion is the accumulation of fluid in the thoracic cavity, specifically between the visceral and parietal pleurae. This condition occurs when fluid escapes into the pleural space, leading to an excessive amount of fluid in the area surrounding the lungs.

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  • 7. 

    What technique can be used to improve visualization of the small pituitary lesions?

    • A.

      IV contrast dose is doubled, and scanning begins 45 minutes after injection

    • B.

      Scans are performed without an IV contrast medium

    • C.

      Intrathecal contrast is administrered by lumbar puncture with scanning approximately 1 hour later

    • D.

      A bolus of IV contrast, followed by rapid sequence scanning

    Correct Answer
    D. A bolus of IV contrast, followed by rapid sequence scanning
    Explanation
    A bolus of IV contrast, followed by rapid sequence scanning, can be used to improve visualization of small pituitary lesions. This technique involves injecting contrast dye into the patient's bloodstream, which enhances the visibility of the lesions during the scan. Rapid sequence scanning refers to performing the scan immediately after the contrast injection, allowing for real-time visualization of the lesions. This method is effective in highlighting small pituitary lesions and obtaining clear and detailed images for accurate diagnosis and treatment planning.

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  • 8. 

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

    • A.

      High mA and short scan time

    • B.

      Low KVP and high contrast or bone algorithm

    • C.

      Adjust the angle of the gantry and widen the window with

    • D.

      Smal focal spot and small display field

    Correct Answer
    C. Adjust the angle of the gantry and widen the window with
    Explanation
    Adjusting the angle of the gantry and widening the window can help reduce the effect of dental filling in a sinus study. By adjusting the angle of the gantry, the dental filling can be positioned out of the field of view, minimizing its impact on the study. Widening the window can increase the range of pixel values displayed, allowing for better visualization of the sinus area and reducing the prominence of the dental filling.

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  • 9. 

    In filming the brain, why is it common practice to use a wider window width through the posterior fossa?

    • A.

      To reduce the radiation exposure to the PT

    • B.

      To decrease the pixel size

    • C.

      To reduce the appearance of beam hardening artifacts

    • D.

      To compensate for the small focal spot that is used in the posterior fossa

    Correct Answer
    C. To reduce the appearance of beam hardening artifacts
    Explanation
    In filming the brain, it is common practice to use a wider window width through the posterior fossa to reduce the appearance of beam hardening artifacts. Beam hardening artifacts occur when the X-ray beam passing through different materials in the body gets hardened, leading to streaks or dark bands in the image. By using a wider window width, the range of X-ray energies that contribute to the image is increased, reducing the visibility of these artifacts and improving the overall image quality.

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  • 10. 

    Which of the following conditions may be visualized in a CT study of the brain

    • A.

      Glioblastoma

    • B.

      Krukenberg tumor

    • C.

      Wilms tumor

    • D.

      Plasmacytosis

    Correct Answer
    A. Glioblastoma
    Explanation
    A CT study of the brain may visualize glioblastoma, which is a type of brain tumor. Glioblastoma is an aggressive and malignant tumor that arises from the glial cells in the brain. It is often characterized by its rapid growth and invasion into surrounding brain tissue. CT scans can help detect glioblastoma by showing abnormal areas of increased density or mass in the brain. This imaging technique can provide valuable information about the location, size, and extent of the tumor, which is crucial for diagnosis and treatment planning.

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  • 11. 

    Which of the following is affected by the slice spacing in the CT study?

    • A.

      Spatial resolution

    • B.

      Quantum mottle

    • C.

      Radiation dose to the PT

    • D.

      Signal to noise ratio

    Correct Answer
    C. Radiation dose to the PT
    Explanation
    The slice spacing in a CT study refers to the distance between consecutive slices. The radiation dose to the patient (PT) is affected by the slice spacing because a smaller spacing requires more slices to be taken, resulting in a higher radiation dose. Therefore, the radiation dose to the PT is directly influenced by the slice spacing in a CT study.

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  • 12. 

    What is an advantage of using a spiral scan technique for a thorax study?

    • A.

      It is less likely to miss small lesions

    • B.

      Image noise is decreased

    • C.

      It is not necessary for the PT to hold their breath

    • D.

      The software that corrects for table motion also eliminates artifacts from PT motion

    Correct Answer
    A. It is less likely to miss small lesions
    Explanation
    The advantage of using a spiral scan technique for a thorax study is that it is less likely to miss small lesions. This is because the spiral scan technique allows for continuous and uninterrupted scanning of the thorax, capturing a more comprehensive view of the area being studied. By eliminating any gaps or spaces between individual scans, the likelihood of missing small lesions is reduced, improving the accuracy and reliability of the study results.

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  • 13. 

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

    • A.

      Choroid plexus

    • B.

      Pineal gland

    • C.

      Caudate nucleus

    • D.

      Middle cerebral artery

    Correct Answer
    B. Pineal gland
    Explanation
    The pineal gland is a small pine cone-shaped structure located in the brain. It is responsible for producing and secreting melatonin, a hormone that regulates sleep-wake cycles. In CT images, the pineal gland can often be seen as calcified, appearing as a bright spot. This calcification is a normal age-related process and is more commonly seen in older individuals. The other options listed (choroid plexus, caudate nucleus, and middle cerebral artery) are all structures in the brain but do not typically appear calcified in CT images.

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  • 14. 

    What is the normal range of CT attenuation measurements for a non contrasted liver in an adult PT?

    • A.

      -60 to -20 HU

    • B.

      0 to 25 HU

    • C.

      38 to 80 HU

    • D.

      108 to 143 HU

    Correct Answer
    C. 38 to 80 HU
    Explanation
    The normal range of CT attenuation measurements for a non contrasted liver in an adult PT is 38 to 80 HU. CT attenuation measurements are used to assess the density of tissues and structures in the body. In this case, the range indicates the normal density range for the liver without the use of contrast agents. Values outside this range may indicate abnormalities or pathology in the liver.

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  • 15. 

    What part of the inner ear play a role in the sense of equilibrium?

    • A.

      Incus

    • B.

      Epitympanic recess

    • C.

      Semicircular canals

    • D.

      Superior sagittal sinus

    Correct Answer
    C. Semicircular canals
    Explanation
    The semicircular canals in the inner ear play a crucial role in the sense of equilibrium. These canals are filled with fluid and are responsible for detecting rotational movements of the head. When the head moves, the fluid inside the canals also moves, which in turn stimulates hair cells that send signals to the brain, allowing us to maintain our balance and sense of spatial orientation. The other options mentioned, such as incus, epitympanic recess, and superior sagittal sinus, are not directly involved in the sense of equilibrium.

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  • 16. 

    By selecting an algorithm, the tech selects

    • A.

      A mathematical formula for processing data

    • B.

      The average photon energy of the x-ray beam

    • C.

      The shades of gray displayed on the image

    • D.

      The center pixel value in the window width

    Correct Answer
    A. A mathematical formula for processing data
    Explanation
    The correct answer is "a mathematical formula for processing data". When selecting an algorithm, the tech is choosing a specific mathematical formula that will be used to process the data. Different algorithms can be used to manipulate and analyze the data in different ways, depending on the desired outcome. This choice of algorithm is crucial in determining how the data will be processed and ultimately interpreted.

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  • 17. 

    What limitation is inherent in using a partial scan to create an image?

    • A.

      Image noise is always excessive because adequate MAS cannot be achieved

    • B.

      Scan data cannot be retrospectively segmented

    • C.

      Longer scan time increases the likelihood of motion artifacts

    • D.

      Beam hardening artifacts are increased

    Correct Answer
    B. Scan data cannot be retrospectively segmented
    Explanation
    Using a partial scan to create an image means that only a portion of the object or area being scanned is captured. This limitation arises because the scan data cannot be retrospectively segmented, meaning that it is not possible to go back and extract specific details or sections from the scan after it has been completed. This can be problematic if there is a need to focus on a particular area of interest or if further analysis or measurements need to be made on specific regions within the image.

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  • 18. 

    The right ventricle sends blood to the

    • A.

      Right atrium

    • B.

      Left atrium

    • C.

      Inferior vena cave

    • D.

      Lungs

    Correct Answer
    D. Lungs
    Explanation
    The right ventricle sends blood to the lungs. This is because the right ventricle receives deoxygenated blood from the right atrium and pumps it to the lungs through the pulmonary artery. In the lungs, the blood is oxygenated and then returned to the left atrium through the pulmonary veins.

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  • 19. 

    What organ produces the digestive enzymes protease, lipase, and amylase?

    • A.

      Gallbladder

    • B.

      Stomach

    • C.

      Small bowel

    • D.

      Pancreas

    Correct Answer
    D. Pancreas
    Explanation
    The pancreas is the organ that produces the digestive enzymes protease, lipase, and amylase. These enzymes are essential for breaking down proteins, fats, and carbohydrates in the digestive system. The pancreas releases these enzymes into the small bowel to aid in the digestion and absorption of nutrients. The gallbladder stores and releases bile, which helps in the digestion of fats, but it does not produce the digestive enzymes mentioned. The stomach produces gastric juices, including pepsin, which aids in protein digestion, but it does not produce the specific enzymes mentioned. Therefore, the correct answer is the pancreas.

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  • 20. 

    An area on a scan has an associated measurment of 900HU, it is most likely to be composed of

    • A.

      Bone

    • B.

      Fat

    • C.

      Water

    • D.

      Air

    Correct Answer
    A. Bone
    Explanation
    Given that the area on the scan has an associated measurement of 900HU, it is most likely to be composed of bone. This is because bone typically has a higher density compared to other tissues in the body, such as fat, water, or air. The Hounsfield Unit (HU) scale is used in medical imaging to measure the density of different tissues, with bone having a higher HU value due to its higher density. Therefore, the measurement of 900HU suggests that the area is composed of bone.

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  • 21. 

    Crohn disease is primarily a disease of the

    • A.

      Gastrointestinal tract

    • B.

      Respiratory system

    • C.

      Lymphatic system

    • D.

      Intergumentary system

    Correct Answer
    A. Gastrointestinal tract
    Explanation
    Crohn's disease is a chronic inflammatory condition that primarily affects the gastrointestinal tract. It causes inflammation and damage to the lining of the digestive system, leading to symptoms such as abdominal pain, diarrhea, and weight loss. The disease can affect any part of the gastrointestinal tract, from the mouth to the anus. It is characterized by periods of flare-ups and remission, and the exact cause is still unknown. Crohn's disease is different from other inflammatory bowel diseases like ulcerative colitis, which primarily affects the colon and rectum.

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  • 22. 

    The area within the gantry for which raw data are acquired is called

    • A.

      SFOV

    • B.

      DFOV

    • C.

      Scannable range

    • D.

      Gantry aperture

    Correct Answer
    A. SFOV
    Explanation
    The area within the gantry for which raw data are acquired is called the SFOV (Scanning Field of View). This refers to the specific region that is captured by the imaging system during a scan. It determines the extent of the anatomical area that will be visualized in the resulting image.

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  • 23. 

    Another word used to describe a volume element is

    • A.

      Pixel

    • B.

      Particle

    • C.

      Interpolated plane

    • D.

      Voxel

    Correct Answer
    D. Voxel
    Explanation
    A voxel is a three-dimensional volume element, often used in medical imaging and computer graphics. It represents a single point within a three-dimensional space and is analogous to a pixel in two-dimensional images. Therefore, voxel is another term used to describe a volume element.

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  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 29, 2008
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    Leclark
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