CT Registry Certification Test Quiz!
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The Computed Tomography (CT) quiz has been developed to test your knowledge of different techniques and procedures used in the CT Scan. This exam is conducted by the American Registry of Radiologic Technologists (AART). Take this quiz to test your knowledge and learn about new topics. Read the questions carefully and answer.
- 1.The 'filter' in filtered back-projection refers to:
- A.
Bowtie filter between the beam and patient
- B.
Conversion between attenuation and Hounsfield units
- C.
Conversion between fan-beam and parallel geometry
- D.
Fix for the blurring inherent to backprojection
- 2.Changing filters (aka kernels) in filtered back-projection results in:
- A.
Trade-off between image sharpness and noise
- B.
Different window levels in CT images
- C.
Different patient dose
- D.
Different reconstructed field of view (FOV)
- 3.In helical CT, a single transverse slice represents:
- A.
A plane through the body perpendicular to the scan axis
- B.
A plane through the body oblique to the scan axis
- C.
A reconstruction made from projections at neighboring scan axis positions
- D.
None
- 4.In helical CT, a pitch is defined as:
- A.
Table movement in 360 degrees / beam width
- B.
Patient dose in 360 degrees / beam width
- C.
Reconstructed slice thickness / beam width
- D.
Gantry angle with respect to the scan axis
- 5.High-pitch techniques are useful for:
- A.
Very small findings (e.g. nondisplaced fracture)
- B.
Gated cardiac CT
- C.
Accurate multiplanar reconstructions
- D.
Fast scans
- 6.Which of the following numbers reported by the scanner best reflects the total amount of radiation delivered to the patient?
- A.
Dose
- B.
CT Dose Index (CTDI)
- C.
Pitch
- D.
Dose-length product (DLP)
- E.
Effective mAs
- 7.Decreasing kV in CT is advantageous because:
- A.
X-ray penetration improves
- B.
Tissue contrast improves
- C.
Scan times are reduced
- D.
Metal streak artifacts are improved
- 8.The goal of automated exposure compensation is:
- A.
To generate images of similar noise in different patient sizes
- B.
To scan patients of different sizes with the same kV and mAs settings
- C.
To obtain pretty, low-noise images
- D.
To eliminate the radiation risks from CT examinations
- 9.Which of the following is NOT an advantage to performing a CT scan for stroke?
- A.
CT can be rapidly performed
- B.
It is always possible to distinguish between old and new infarcts
- C.
CT allows easy exclusion of hemorrhage.
- D.
CT allows the assessment of prenchymal damage
- 10.Which of the following is NOT true concerning CT?
- A.
CT is the imaging modality of choice for the detecting subarachnoid hemorrhage
- B.
Small subarachnoid bleeds may be inapparent.
- C.
On CT, subarachnoid hemorrhage appears as high density within sulci and CSF cisterns.
- D.
CT becomes more sensitive days to weeks after the acute phase of a subarachnoid hemorrhage.
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