Question

Which of these statements are true?

a. The number of measurements for reconstruction is dependent on the number of detectors

b. Filter back projection is the most common image reconstruction technique used

c. In filter back projection, the effect of the neighbouring beam on each pixel is directly proportional to their distance

d. The partial volume effect is greater in spiral CT

e. Helical/spiral CT needs more heat capacity

Answer 1

a. True. Number of measurements for reconstruction of the image = number of detectors number of scans at 360°.

b. True.

c. False. The effect of the neighbouring beam is inversely proportional to the distance.

d. False. The advantages of helical/spiral CT are: high speed, reduced misregistration, continuous data acquisition, a single exposure and reduced partial volume effect. In spiral CT, less contrast medium is required but more heat loading or capacity is needed.

e. True.