CT exam questions boot camp
what radiation dose quantity is significantly influenced by the overall length of a CT scan? - Answer-dose
length product (DLP)
in what way do Compton scattering interactions affect the image quality of a CT scan? - Answer-
decreased contrast resolution
what liver pathology is commonly observed in CT as multiple hypoattenuating lesions - Answer-liver
mets
what is the primary indication for a CT colonography with volume rendering (VR)? - Answer-screening
for colorectal carcinoma
what CT windowing technique is appropriate for visualizing lung tissue? - Answer-1800 WW and -600
WL
what post processing method in CT is useful for creating images with variable transparency and colors? -
Answer-volume rendering
, what is the primary anatomical structure of interest when performing ejection fraction measurements in
CT? - Answer-left ventricle
which of the following exposure settings will produce an xray beam with the highest beam quantity?
A. 70 kVp 500 mA
B. 90 kVp 200 mA
C. 110 kVp 400 mA
D 140 kVp 300 mA - Answer-D
which of the following CT detector configurations should be used to minimize total scan time?
A. 64 rows x 0.625mm per row
B. 32 rows x 1.25 mm per row
C. 16 rows x 0.625mm per row
D. 8 rows x 1.25mm per row - Answer-B
what vessel is formed by the fusion of the vertebral arteries at the level of the foramen magnum? -
Answer-basilar artery
a single slice in a series of axial images shows a pattern of parallel streaks across the entire image. what
is the likely cause of the artifact? - Answer-xray tube output was temporarily lost
what xray beam geometry is used by a cone beam CT scanner? - Answer-3 dimensional xray beam
exposing several detector rows
what reconstruction algorithm decreases image noise at the expense of decreasing spatial resolution? -
Answer-standard algorithm
what radiation dose quantity is significantly influenced by the overall length of a CT scan? - Answer-dose
length product (DLP)
in what way do Compton scattering interactions affect the image quality of a CT scan? - Answer-
decreased contrast resolution
what liver pathology is commonly observed in CT as multiple hypoattenuating lesions - Answer-liver
mets
what is the primary indication for a CT colonography with volume rendering (VR)? - Answer-screening
for colorectal carcinoma
what CT windowing technique is appropriate for visualizing lung tissue? - Answer-1800 WW and -600
WL
what post processing method in CT is useful for creating images with variable transparency and colors? -
Answer-volume rendering
, what is the primary anatomical structure of interest when performing ejection fraction measurements in
CT? - Answer-left ventricle
which of the following exposure settings will produce an xray beam with the highest beam quantity?
A. 70 kVp 500 mA
B. 90 kVp 200 mA
C. 110 kVp 400 mA
D 140 kVp 300 mA - Answer-D
which of the following CT detector configurations should be used to minimize total scan time?
A. 64 rows x 0.625mm per row
B. 32 rows x 1.25 mm per row
C. 16 rows x 0.625mm per row
D. 8 rows x 1.25mm per row - Answer-B
what vessel is formed by the fusion of the vertebral arteries at the level of the foramen magnum? -
Answer-basilar artery
a single slice in a series of axial images shows a pattern of parallel streaks across the entire image. what
is the likely cause of the artifact? - Answer-xray tube output was temporarily lost
what xray beam geometry is used by a cone beam CT scanner? - Answer-3 dimensional xray beam
exposing several detector rows
what reconstruction algorithm decreases image noise at the expense of decreasing spatial resolution? -
Answer-standard algorithm
