TBR-CT - Training From The BACK Of The Room Certified Trainer
TBR-CT - Training from the BACK of the Room Certified Trainer
Exam (elaborations)
CT physics possible Questions and Answer 2024
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TBR-CT - Training from the BACK of the Room Certified Trainer
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TBR-CT - Training From The BACK Of The Room Certified Trainer
Exam of 8 pages for the course TBR-CT - Training from the BACK of the Room Certified Trainer at TBR-CT - Training from the BACK of the Room Certified Trainer (CT physics possible)
Q1. The image formed by the CT scanner is based on the attenuation of the x-rays via:
a. Photoelectric effect of x-rays in the patient.
b. Compton interaction of x-rays in the patient.
c. Compton interaction of x-rays in the detectors.
d. Compton and photoelectric effects at the detectors. - answer Compton interaction of
x-rays in the patient.
Q2. The principle advantage of CT over projection radiography is:
a. Speed of image acquisition
b. Energy resolution
c. Contrast resolution
d. Spatial resolution
e. Temporal resolution - answer Contrast resolution
Q3. When compared to the third-generation, fourth generation CT imagers usually have:
a. Higher patient dose
b. Better spatial resolution
c. Better contrast resolution
d. More noise
e. More artefacts - answerHigher patient dose
Q4. Which of the following characteristics contributes to heat dissipation in a CT x-ray
tube?
a. High-frequency generator
b. Increased beam filtration
c. Large diameter disk
d. Precise beam collimation
e. Small focal spot - answerLarge diameter disk
Q5. One troublesome result of using high kVp during CT imaging is the:
a. Reduction in image time
b. Reduction in image reconstruction time
c. Increase in radiation intensity at the image receptor
d. Increase patient dose
e. Increase in x-ray tube loading - answerIncrease in radiation intensity at the image
receptor
Q6. A restriction on the x-ray tube generator of CT scanners is that the beam intensity
should not vary by more than:
a. 20%
, b. 5.0%
c. 0.1%
d. 1.0% - answer1.0%
Q7. The scintillator detector most used in CT scanners is:
a. Sodium Iodide
b. Xenon
c. Cesium Iodide
d. Calcium Tungstate
e. Cadmium Tungstate - answerCadmium Tungstate
Q8. The principal reason to filter the x-ray beam of a CT scanner by aluminium is to:
a. Reduce patient dose
b. Homogenise the beam at the detector array
c. Equalise beam intensity at the detector array
d. Reduce imaging time
e. Remove image artefacts - answerReduce patient dose
Q9. Smoother reconstruction filters are used for:
a. High resolution imaging
b. Imaging of soft tissue
c. Low resolution imaging
d. High subject contrast imaging - answerImaging of soft tissue
Q10. One of the principal advantages of spiral (helical) CT over conventional CT is:
a. Improved contrast resolution
b. Improved image reconstruction
c. Improved spatial resolution
d. No intra-scan delay
e. Volumetric imaging within one breath-hold - answerNo intra-scan delay
Q11. When comparing 180-degrees interpolation with 360-degrees interpolation:
a. Contrast resolution is better
b. Image noise is less
c. Reconstruction time is reduced
d. Spatial resolution is better
e. Thinner slices are possible - answerReconstruction time is reduced
Q12. One statement is correct about "filtered back-projection" reconstruction in CT:
a. Back projection produces un-blurred trans-axial images
b. Back projection produces blurred trans-axial images
c. Projection data need to be filtered after image reconstruction
d. Projection data are not needed before image reconstruction - answerBack projection
produces un-blurred trans-axial images
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