CT Physics Trivia Quiz

Reviewed by Matt Balanda
Matt Balanda, BS (Aerospace Engineering) |
Science Teacher
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Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.
 , BS (Aerospace Engineering)
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  • 1/24 Questions

    Computed Tomography (CT) results in a/an

    • Analog image
    • Linear image
    • Digital image
    • Image in time
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About This Quiz

CT Physics- Computed Tomography is a popular term. We've designed here an interesting 'CT Physics Trivia Quiz' to test your knowledge about computed tomography and its related concepts. Do you think you'll be able to pass this test? Let's see how much you can score. We'll give you a certificate in the end that will display your final scores. So, get ready and start answering these questions. Wishing good luck to you!

CT Physics Trivia Quiz - Quiz

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  • 2. 

    Which of the following scientists were instrumental in the initial development of CT? 1. Alan Cormack 2. Raymond Damadian 3. Godfrey Hounsfield 4. Paul Lauterbur

    • Only 1, 2, and 3 are correct

    • Only 1 and 3 are correct

    • Only 2 and 4 are correct

    • Only 4 is correct

    • All are correct

    Correct Answer
    A. Only 1 and 3 are correct
    Explanation
    Alan Cormack and Godfrey Hounsfield were instrumental in the initial development of CT. Alan Cormack developed the mathematical technique known as the "back-projection algorithm," which is used to reconstruct images from X-ray projections in CT scans. Godfrey Hounsfield built upon Cormack's work and developed the first commercially viable CT scanner, known as the EMI scanner. Together, their contributions revolutionized medical imaging and paved the way for the widespread use of CT technology in healthcare.

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  • 3. 

    When compared to projection radiography, conventional tomography shows

    • Better spatial resolution

    • Improved contrast resolution

    • Reduced patient dose

    • Less operator involvement

    Correct Answer
    A. Improved contrast resolution
    Explanation
    Conventional tomography shows improved contrast resolution compared to projection radiography. This means that conventional tomography is able to distinguish between different shades of gray more effectively, allowing for better visualization and differentiation of structures within the image. This improvement in contrast resolution can be beneficial in identifying abnormalities or subtle changes in the tissues or organs being examined.

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  • 4. 

    The first CT image was demonstrated by

    • Alan Cormack

    • Raymond Damadian

    • Godfrey Hounsfield

    • Frank Lauterbur

    • Larry Rothenberg

    Correct Answer
    A. Godfrey Hounsfield
    Explanation
    Godfrey Hounsfield is credited with demonstrating the first CT image. He developed the technique of computed tomography (CT) in the early 1970s, which involved using X-rays to create cross-sectional images of the body. Hounsfield's work revolutionized medical imaging by providing detailed, three-dimensional views of internal structures. His invention led to significant advancements in the diagnosis and treatment of various medical conditions.

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  • 5. 

    The principal advantage of CT over conventional tomography is

    • Speed of image acquisition

    • Reduced patient dose

    • Improved contrast resolution

    • Improved spatial resolution

    • Fewer artifacts

    Correct Answer
    A. Improved contrast resolution
    Explanation
    CT (Computed Tomography) has an advantage over conventional tomography in terms of improved contrast resolution. This means that CT scans are able to differentiate between different tissues and structures in the body more clearly, allowing for better visualization and diagnosis of abnormalities. This is beneficial in identifying subtle differences in densities, enhancing the ability to detect and characterize various conditions.

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  • 6. 

    The mathematics of back projection applied to image reconstruction in CT is credited to:

    • Alan cormack

    • Raymond Damadian

    • Frank Lauterbur

    Correct Answer
    A. Alan cormack
    Explanation
    The correct answer is Alan Cormack. Alan Cormack is credited with developing the mathematics of back projection applied to image reconstruction in CT (Computed Tomography). CT is a medical imaging technique that uses X-rays to create detailed cross-sectional images of the body. Cormack's work was instrumental in the development of CT technology, allowing for the reconstruction of images from multiple X-ray projections. His contributions have had a significant impact on the field of medical imaging and have greatly improved diagnostic capabilities.

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  • 7. 

    Which of the following imaging modalities appeared first

    • Emission imaging with radioisotopes

    • Diagnostic ultrasound

    • Projection radiography

    • Electron beam CT (EBCT)

    • Spiral CT

    Correct Answer
    A. Projection radiography
    Explanation
    Projection radiography, also known as X-ray imaging, is the oldest imaging modality among the options provided. It was first discovered and used in medical imaging in the late 19th century by Wilhelm Conrad Roentgen. This technique involves passing X-rays through the body and capturing the transmitted radiation on a photographic plate or digital detector, creating a two-dimensional image. Emission imaging with radioisotopes, diagnostic ultrasound, electron beam CT (EBCT), and Spiral CT were developed and introduced later in the 20th century.

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  • 8. 

    The principal advantage of CT over projection radiography is

    • Speed of image acquisition

    • Energy resolution

    • Contrast resolution

    • Spatial resolution

    Correct Answer
    A. Contrast resolution
    Explanation
    CT (computed tomography) has a principal advantage over projection radiography in terms of contrast resolution. Contrast resolution refers to the ability of an imaging technique to distinguish between different tissues or structures based on their differences in contrast. In CT, contrast resolution is significantly better than in projection radiography. CT can differentiate between tissues with similar densities and can provide detailed images with high contrast between different structures. This is achieved by using a combination of X-ray beams and computer algorithms to create cross-sectional images of the body, allowing for better visualization and diagnosis of various conditions.

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  • 9. 

    The data acquisition in CT results in a/an

    • Oblique image

    • Transverse image

    • Sagittal image

    • Coronal image

    • Volume image

    Correct Answer
    A. Transverse image
    Explanation
    The correct answer is transverse image. In CT (computed tomography), data acquisition involves taking multiple cross-sectional images of the body. A transverse image refers to a slice of the body that is taken horizontally, dividing it into upper and lower sections. This type of image provides a detailed view of structures and organs in a specific plane, allowing for accurate diagnosis and evaluation of abnormalities.

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  • 10. 

    Which of the following involves emission of a signal from a patient?

    • CT

    • Diagnostic ultrasound

    • Magnetic resonance imaging

    • Projection radiography

    Correct Answer
    A. Magnetic resonance imaging
    Explanation
    Magnetic resonance imaging (MRI) involves the emission of a signal from a patient. In MRI, a strong magnetic field is used to align the protons in the patient's body. Radiofrequency pulses are then applied to the patient, causing the protons to emit a signal. This signal is detected by the MRI machine and used to create detailed images of the patient's internal structures. CT, diagnostic ultrasound, and projection radiography do not involve the emission of a signal from the patient.

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  • 11. 

    A characteristic feature of a projection radiograph is

    • Poor spatial resolution

    • Lengthy data acquisition

    • Tissue superimposition

    • Excessive patient dose

    Correct Answer
    A. Tissue superimposition
    Explanation
    A characteristic feature of a projection radiograph is tissue superimposition. This refers to the overlapping of different structures and tissues in the image, which can make it difficult to distinguish individual details. Tissue superimposition is a common limitation in projection radiography, as it is a 2D imaging technique that does not provide depth information. This can be overcome by using other imaging modalities such as CT or MRI, which provide more detailed and accurate images.

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  • 12. 

    Which of the following involves emission of a signal from a patient?

    • CT

    • Diagnostic ultrasound

    • Projection radiography

    • Radioisotope imaging

    • Spiral CT

    Correct Answer
    A. Radioisotope imaging
    Explanation
    Radioisotope imaging involves the emission of a signal from a patient. In this imaging technique, a small amount of radioactive material, known as a radioisotope, is injected into the patient's body. The radioisotope emits gamma rays, which are detected by a special camera or scanner. This allows for the visualization of internal organs or structures, as the emitted signal provides information about their function or metabolism. In contrast, CT, diagnostic ultrasound, projection radiography, and spiral CT do not involve the emission of a signal from the patient.

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  • 13. 

    Computed tomography is otherwise identified as

    • Emission tomography

    • Transmission tomography

    • Reflection tomography

    • Temporal tomography

    Correct Answer
    A. Transmission tomography
    Explanation
    Computed tomography is a medical imaging technique that uses X-ray technology to produce detailed cross-sectional images of the body. It is commonly referred to as transmission tomography because it measures the transmission of X-rays through the body to create these images. Emission tomography, on the other hand, involves the detection of radioactive substances emitted by the body, while reflection tomography and temporal tomography are not accurate descriptions of computed tomography.

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  • 14. 

    What is the principal cause of reduced contrast in projection radiography?

    • Useful beam radiation

    • Scatter radiation

    • Leakage radiation

    • Collimation

    • KVp

    Correct Answer
    A. Scatter radiation
    Explanation
    The principal cause of reduced contrast in projection radiography is scatter radiation. When X-rays pass through the patient's body, they can be scattered in different directions, leading to a decrease in contrast on the radiographic image. This scatter radiation can originate from various sources, such as the patient's body tissues or the equipment itself. It is important to minimize scatter radiation by using collimation and other techniques to improve image quality and diagnostic accuracy.

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  • 15. 

    Image presentation in conventional tomography is

    • Axial

    • Coronal

    • Sagittal

    • Transverse

    • Volumetric

    Correct Answer
    A. Axial
    Explanation
    The correct answer is axial. Axial refers to a plane that is parallel to the long axis of the body or a body part. In conventional tomography, images are taken in the axial plane, which allows for detailed visualization of structures in a specific region of interest. This imaging technique is particularly useful for examining structures that lie deep within the body, such as the brain, spine, and chest.

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  • 16. 

    Which of the following image modalities are likely to have less scatter radiation affecting the image?

    • Fluoroscopy

    • Projection of radiography

    • Conventional tomography

    • CT

    • Radioisotope emission tomography

    Correct Answer
    A. CT
    Explanation
    CT (Computed Tomography) is likely to have less scatter radiation affecting the image compared to other image modalities listed. This is because CT uses a narrow beam of x-rays that rotates around the patient to create cross-sectional images. The use of a narrow beam and the rotating nature of the x-ray source help to minimize scatter radiation, resulting in clearer and more accurate images. In contrast, fluoroscopy, projection radiography, conventional tomography, and radioisotope emission tomography may have more scatter radiation due to their different imaging techniques.

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  • 17. 

    When compared to projection radiography, conventional tomography shows

    • Better spatial resolution

    • Less tissue superimposition

    • Reduced patient dose

    • Relaxed quality control

    Correct Answer
    A. Less tissue superimposition
    Explanation
    Conventional tomography shows less tissue superimposition compared to projection radiography. This means that in conventional tomography, the overlapping of different layers of tissue is minimized, allowing for clearer and more detailed imaging of specific structures or areas of interest. This is beneficial as it helps to improve the accuracy and clarity of the images obtained, leading to better diagnostic capabilities.

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  • 18. 

    Which of the following finds application in bone mineral assay for evaluation of osteoporosis?

    • Radioisotope emission tomography

    • Conventional tomography

    • CT

    • Projection radiography

    Correct Answer
    A. CT
    Explanation
    CT (Computed Tomography) finds application in bone mineral assay for evaluation of osteoporosis. CT scans use X-ray technology to create detailed cross-sectional images of the body, allowing for the measurement of bone density. This is important in the assessment of osteoporosis, a condition characterized by weak and brittle bones. CT scans can accurately measure bone mineral density and provide valuable information for diagnosis and monitoring of osteoporosis.

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  • 19. 

    The term "projection" when applied to CT, refers to

    • Speed of image acquisition

    • A data set representing x-ray attenuation in the patient

    • The size of the x-ray beam projected on the patient

    • The shape of the x-ray beam projected on the patient

    • The mathematics of image reconstruction

    Correct Answer
    A. A data set representing x-ray attenuation in the patient
    Explanation
    In CT imaging, "projection" refers to the process of obtaining multiple x-ray images from different angles around the patient. These images are then used to create a data set that represents the x-ray attenuation in the patient's body. This data set contains information about the different tissues and structures in the patient, allowing for the creation of detailed cross-sectional images through the process of image reconstruction. Therefore, the correct answer is "a data set representing x-ray attenuation in the patient."

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  • 20. 

    Which of the following are characteristic limitations of CT?1. spatial resolution2. artifact generation3. z-axis resolution4. patient dose

    • Only 1, 2, and 3 are correct

    • Only 1 and 3 are correct

    • Only 2 and 4 are correct

    • Only 4 is correct

    • All are correct

    Correct Answer
    A. All are correct
    Explanation
    CT (Computed Tomography) has several characteristic limitations.

    1. Spatial resolution refers to the ability of CT to distinguish small structures and details. CT has a limited spatial resolution, which means it may not be able to accurately detect very small abnormalities or lesions.

    2. Artifact generation is another limitation of CT. Artifacts are unwanted features or distortions in the CT image that can occur due to various factors such as patient motion, metal implants, or high-density structures. These artifacts can obscure or distort the true anatomy.

    3. Z-axis resolution refers to the ability of CT to distinguish structures in the z-axis or the depth direction. CT has a limited z-axis resolution, which means it may not accurately depict fine details in the depth dimension.

    4. Patient dose is also a limitation of CT. CT involves the use of ionizing radiation to generate images, and repeated or excessive CT scans can increase the radiation dose to the patient, which may pose potential risks.

    Therefore, all of the given options (1, 2, 3, and 4) correctly represent the characteristic limitations of CT.

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  • 21. 

    Place the following in chronological order 1. CT 2. electron beam CT (EBCT) 3. multi-section computed tomography 4. Spiral CT

    • 1,2,3,4

    • 1,2,4,3

    • 1,3,2,4

    • 1,4,2,3

    • 1,3,4,2

    Correct Answer
    A. 1,2,4,3
    Explanation
    The correct chronological order for the development of computed tomography (CT) techniques is as follows: 1. CT, 2. electron beam CT (EBCT), 3. Spiral CT, 4. Multi-section computed tomography. CT was the earliest technique developed, followed by the advancement of EBCT, which uses an electron beam instead of a traditional X-ray tube. Spiral CT was then introduced, which allowed for continuous scanning in a spiral pattern. Finally, multi-section computed tomography was developed, which refers to the ability to acquire multiple slices simultaneously.

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  • 22. 

    Compared to projection radiography, conventional tomography results in improved contrast resolution because

    • Imaging time is reduced

    • Out of plane tissues are blurred

    • Tissues are superimposed

    • Precise beam collimation is employed

    Correct Answer
    A. Out of plane tissues are blurred
    Explanation
    Conventional tomography results in improved contrast resolution because out of plane tissues are blurred. In projection radiography, tissues that are not in the same plane as the area of interest can overlap and obscure the details. However, in conventional tomography, the X-ray tube and the image receptor move in opposite directions during the exposure, blurring the out of plane tissues and allowing for better visualization of the structures in the desired plane. This blurring effect helps to enhance the contrast resolution and improve the quality of the image.

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  • 23. 

    Computed tomography results in improved contrast resolution because

    • Digital techniques are employed

    • Tissue superimposition is reduced

    • Tissues are superimposed

    • Precise beam collimation is employed

    Correct Answer
    A. Precise beam collimation is employed
    Explanation
    Computed tomography (CT) results in improved contrast resolution because precise beam collimation is employed. Precise beam collimation refers to the ability to narrow down the X-ray beam to a specific area of interest, allowing for better differentiation between tissues and reducing the effect of tissue superimposition. This technique helps to enhance the clarity and contrast of the resulting CT images, making it easier to identify and distinguish different structures within the body.

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  • 24. 

    Compared to projection radiography, conventional tomography will improve 1. contrast resolution 2. patient dose 3. superimposition of tissues 4. spatial resolution

    • Only 1, 2, and 3 are correct.

    • Only 1 and 2 are correct.

    • Only 2 and 4 are correct.

    • Only 4 is correct.

    • All are correct.

    Correct Answer
    A. Only 1 and 2 are correct.
    Explanation
    Conventional tomography improves contrast resolution and patient dose compared to projection radiography. Contrast resolution refers to the ability to distinguish between different shades of gray in an image, allowing for better visualization of subtle differences in tissues. Tomography reduces superimposition of tissues by selectively blurring structures that are not in the plane of interest, resulting in clearer images. Additionally, tomography helps in reducing patient dose by focusing the radiation only on the area of interest, minimizing exposure to other areas.

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Matt Balanda |BS (Aerospace Engineering) |
Science Teacher
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

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