Week 3

Question 1

Occurs when the beam passes through dense material

Answer 1

beam hardening

Question 2

Which of the following is FALSE regarding single-detector CT?

it has limited reconstruction ability

slice thickness can be retrospectively changed

it acquires data slice by slice

beam width is determined by the slice thickness and number of detector channels

Answer 2

slice thickness can be retrospectively changed

Question 3

An increase in the scanner rotation time may also result in increased:

Answer 3

Noise

Question 4

In multidetector CT, beam pitch is calculated as table feed per rotation divided by:

Answer 4

Total collimation

Question 5

During the analog to digital conversion, the _____ assigns binary units to form the digital signal.

Answer 5

Coder

Question 6

A ring artifact usually results from:

Answer 6

missing data from a detector element

Question 7

T/F: A pitch greater than 1 result in increased patient dose.

Answer 7

False

Question 8

In multislice CT scanners, the definition of pitch is defined as:

Answer 8

P = distance the table travels per rotation (d)/total collimation (W)

Question 9

What type of detector is used in MSCT scanners?

Answer 9

Solid-state scintillation detector