CT Multiple Choice Questions
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Question 1 of 20
1. Question
Concerning the principles of CT
(a) The CT number represents the X-ray attenuation of the denser tissue within a voxel
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Question 2 of 20
2. Question
Concerning the principles of CT
(b) Halving the voxel size will increase image noise, if mA is unchanged
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Question 3 of 20
3. Question
Concerning the principles of CT
(c) The CT number of water is +1000
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Question 4 of 20
4. Question
Concerning the principles of CT
(d) Muscle has lower CT number than fat
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Question 5 of 20
5. Question
Concerning the principles of CT
(e) The same region of a CT slice acquired at 120kV or 100 kV will present the same CT number
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Question 6 of 20
6. Question
Concerning image quality in CT
(a) Soft kernels (filters) improve image Signal-to-Noise Ratio (SNR)
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Question 7 of 20
7. Question
Concerning image quality in CT
(b) Changing the Window and Level settings affects the image SNR
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Question 8 of 20
8. Question
Concerning image quality in CT
(c) Increasing the size of the acquisition Field-of-View (FoV) reduces detail visibility
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Question 9 of 20
9. Question
Concerning image quality in CT
(d) Reducing slice thickness improves spatial resolution and decreases dose
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Question 10 of 20
10. Question
Concerning image quality in CT
(e) A head CT scan at 140kV displays reduced soft tissue contrast compared to a scan acquired at 120 kV
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Question 11 of 20
11. Question
Concerning artefacts in CT imaging
(a) Regions affected by beam hardening present increased CT numbers
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Question 12 of 20
12. Question
Concerning artefacts in CT imaging
(b) A faulty detector can cause a ring artefact
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Question 13 of 20
13. Question
Concerning artefacts in CT imaging
(c) Photon starvation (e.g. due to large patient) causes dark lines
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Question 14 of 20
14. Question
Concerning artefacts in CT imaging
(d) Beam hardening artefacts may occur when scanning ‘bonny’ anatomy or metal
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Question 15 of 20
15. Question
Concerning artefacts in CT imaging
(e) Beam hardening and scatter both produce dark streaks artefacts.
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Question 16 of 20
16. Question
Modern CT scanners
(a) Use 3rd generation geometry
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Question 17 of 20
17. Question
Modern CT scanners
(b) Use a pencil-shaped X-ray beam
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Question 18 of 20
18. Question
Modern CT scanners
(c) Have a detector bank composed of multiple detector rows (e.g. 64 to 320)
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Question 19 of 20
19. Question
Modern CT scanners
(d) Offer tube voltage (kV) range between 100 – 150 kV
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Question 20 of 20
20. Question
Modern CT scanners
(e) Use collimators to define the slice thickness
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