What algorithm produces a data set with minimized artifacts?
a.convolution
b.kernel
c.filtered back-projection
d.back projection filtered
back-projection
High frequency generators provide power to the x-ray tube, producing kV in
the range of:
a.60 kV-120 kV
b.80 kV-120 kV
c.60 kV-140 kV
d.80 kV-140 kV
80 kV-140 kV
For a CT Soft Tissue Neck exam, what can the CT technologist adjust to
reduce the effect of dental artifacts?
1. adjust the patient to ensure the OML is perpendicular to the floor 2. tilt the
gantry away from the teeth 3. ask the patient to remove items from their
mouth, such as dentures, prior to the scan
a. 1 and 2
,b. 2 and 3
c. 1 and 3
d. 1, 2, and 3
2 and 3
CT colonography requires:
a. 100-120 mL of contrast
b. 250-500 mL of contrast
c. 200-300 mL of contrast
d. CO2 insufflation
CO2 insufflation
Which of the following enhancement phases should be included for a
suspected liver hemagioma?
1. Arterial phase (35 sec) 2. portal venous phase (65 sec) 3. Excretory phase
(10 min)
a. 1 and 2
b. 2 and 3
c. 1 and 3
d. 1, 2, and 3
1, 2, and 3
Pixel size is defined by:
a. slice thickness multiplied by the length of the scan
b. the distance the table travels during a single breath hold
c. the display field of view (DFOV) divided by the matrix size
d. the number of rows divided by the number of columns in the matrix
,the display field of view (DFOV) divided by the matrix size
A CTA chest scan to rule out a pulmonary embolism terminates at the:
a. iliac crest
b. diaphragm
c. lung apices
d. mid-kidney
lung apices
The dose length product (DLP) is:
a. the volume of tissue being irradiated multiplied by the length of the scan
b. the effective dose multiplied by the length of multiple scans
c. the scan length multiplied by the CTDI volume
d. the volume of tissue being irradiated multiplied by the pitch the scan length
multiplied by the CTDI volume
What is another name for the late or delayed phase of the abdomen, which
occurs several minutes after contrast injection?
a. equilibrium phase
b. arterial phse
c. portal venous phase
d. hepatic phase
hepatic phase
Risk factors for contrast-induced nephrotoxicity include:
1. dehydration 2. diabetes 3. exceeding 200 mL of IV contrast in 24 hours
a. 1 and 2
, b. 2 and 3
c. 1 and 3
d. 1, 2, AND 3
1, 2, and 3
After a phantom scan, the line pairs results of different scanners are
compared. The scanner that identified ______ has the best spatial resolution.
a. 15 line pairs
b. 20 line pairs
c. 25 line pairs
d. 30 line pairs
30 line pairs
A water phantom is used in __________ testing to check for noise during daily
calibration
a. linearity
b. accuracy
c. standard deviation
d. uniformity
standard deviation
Which of the following patients receiving intravenous contrast require current
lab values prior to their appointment?
a. stroke patients
b. patient with known renal insufficiency
c. patients with previous contrast resolution
d. every patient requires lab work prior to IV contrast administration
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