CT Basic Module 2

Most modern CT scanner tables are made of:

a. carbon fiber
b. aluminum
c. copper
d. plastic resin
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Most modern CT scanner tables are made of:

a. carbon fiber
b. aluminum
c. copper
d. plastic resin
a. carbon fiber
In a busy CT department, an x-ray tube is expected to last approximately:

a. 6 months
b 1 year
c. 18 months
d. 2 years
b. 1 year
The detector's ability to gather the x-ray photons that pass through the patient is called _______ efficiency

a. absorption
b. reproducibility
c. capture
d. dynamic
c. capture
Which type of detectors are the industry standard because of their increased sensitivity and reliability?

a. gas ionization
b. screen capture
c. ceramic substrate
d. scintillation
d. scintillation
Collimators used in CT include: 1. prepatient 2. postpatient 3.automatic

a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1,2, and 3
a. 1 and 2
Which type of CT scanning is characterized by a stop-and-start rotation motion?

a. helical
b. axial
c. volume
d. interscan
b. axial
If a patient takes several breath holds with different levels of inspiration throughout the exam, the reconstructed images may demonstrate a specific type of artifact. What is the name of this artifact?

a. ring
b. aliasing
c. beam hardening
d. misregistration
d. misregistration
The development of _____ allowed the x-ray tube and detectors to rotate around a patient continuously

a. internal generators
b. rotating anodes
c. slip rings
d. multidetectors
c. slip rings
If gaps exist between slices of a CT scan, the pitch setting would be:

a. exactly 0
b. less than 1
c. exactly 1
d. greater than 1
d greater than 1
Which of the following factors determines pitch?

a. generator power
b. table movement
c. kVp setting
d. detector material
b. table movement
The actual area of interest scanned by the CT scanner is the: a. scan field of view b. display field of view c. matrix d. region of interesta. scan field of viewA(n) _____ image looks similar to a plain-film radiograph and is used to set the scan box a. volumetric b. scout c. misregistered d. annotatedb. scoutThe CT number for water is approximately: a. -1000 b. 0 c. +1000 d. +3000b. 0The window width adjustment influences: a. resolution b. patient dose c. blurring d. contrastd. contrastWhich CT computer component is responsible for applying algorithms to the attenuation data to produce the final CT image? a. archiving system b. array processor c. analog-to-digital converter d. sample/hold unitb. array processorWhich of the following is an information collection device in the data acquisition system used in digital imaging? a. analog-to-digital converter b. picture archiving and communication system c. detector d. algorithmc. detectorPixel size can be determined by dividing the field of view by the: a. matrix size b. voxel size c. scan time d. number of detectorsa matrix sizeWhich of the following are typical matrix sizes in CT? 1. 240 X 780 2. 512 x 512 3. 1024 X 1024 a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3c. 2 and 3Which type of voxel is equal on all sides (i.e., a perfect cube)? a. isotropic b. anisotropic c. multiplanar d. aliaseda. isotropic