Week 1

Question 1

CT tube voltages typically range from:

Answer 1

80 - 140 kV

Question 2

Using _______, the data acquired during a single scan can also be processed differently to display primarily soft tissue or bony anatomy.

Answer 2

Computer algorithms

Question 3

To date, there have been ____ major generations of CT equipment.

Answer 3

7

Question 4

_______ refers to the way the x-ray beam is emitted from the tube housing, passes through the patient, and is acquired by the CT detectors.

Answer 4

Beam geometry

Question 5

A high-kilovolt (kV) technique is necessary in CT imaging for all the following reasons except:
a. to reduce the contrast of bone relative to soft tissues.
b. to increase the probability of beam hardening.
c. to reduce the dependence of attenuation coefficients on photon energy.
d. to produce a high-radiation flux at the detector.

Answer 5

B

Question 6

The gantry houses:
x-ray tube
collimators
slip rings
all of the above

Answer 6

all of the above

Question 7

T/F: X-ray film is used as the detector in CT imaging.

Answer 7

False

Question 8

T/F: CT is better at recording very small differences in tissue contrast compared to conventional tomography.

Answer 8

True

Question 9

The range of CT numbers in an image is called the:

Answer 9

window width (WW)