ASRT Modules Review Questions with 100% Correct Answers
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ASRT
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ASRT
ASRT Modules Review Questions with 100% Correct Answers
Helical scanning motion was first made possible by the unique construction of the ____________ scanner.
A) fourth generation B) fifth generation C) sixth generation D) seventh generation - Correct Answer 7th
The type of beam geometry use...
ASRT Modules Review Questions with 100%
Correct Answers
Helical scanning motion was first made possible by the unique construction of the ____________
scanner.
A) fourth generation B) fifth generation C) sixth generation D) seventh generation - Correct Answer
7th
The type of beam geometry used in modern CT scanners is called:
A) fan beam. B) wide beam. C) pencil beam. D) cone beam. - Correct Answer cone beam
The ___________ method of data acquisition gathers image data in distinct sections and is
sometimes describes as having a "start/stop" motion.
A) spiral B) sequential C) helical D) volume - Correct Answer sequential
When pitch is less than 1, the resulting bands of data are:
A) adjacent. B) distinct. C) overlapped. D) gapped - Correct Answer overlapping
Which of the following is not a component of the CT gantry?
A) X-ray tube B) Array processor C) Slip rings D) Digital acquisition system - Correct Answer array
processor
Detector systems in which the elements are not all the same size are referred to as:
A) adaptive arrays. B) volumetric arrays. C) symmetric arrays. D) unbalanced arrays. - Correct Answer
adaptive arrays
All of the following are characteristics of beam-shaping filters, except:
A) they are physical devices.
B) they change the spatial distribution of the beam.
C) they change the digital appearance of images.
D) they remove lower-energy x-rays from the beam. - Correct Answer they change digital appearance
of images
,The primary data processing component of the CT system is the:
A) array processor. B) digital acquisition system. C) PACS. D) amplifier. - Correct Answer array
processor
An increase in pitch also results in increased:
A) patient dose. B) scan speed. C) image quality. D) scan length. - Correct Answer scan speed
The largest piece of the CT device is called:
A) the gantry. B) the processor. C) the housing. D) the ring. - Correct Answer gantry
When considering detector efficiency, the measure of how consistently the detectors respond is
called:
A) capture efficiency. B) absorption efficiency. C) stability. D) response time. - Correct Answer stability
Which component of the CT gantry supplies electrical power to the x-ray tube and transfers the
signals from the detectors to the computer?
A) Generator B) Slip rings C) Photomultiplier D) Data acquisition system - Correct Answer slip rings
The first generation CT scan pattern was called _______ acquisition.
A) translate and rotate B) step-and-shoot C) helical D) linear - Correct Answer translate and rotate
Which of the following is false regarding conventional axial scanning compared to helical scanning?
A) Axial scanning requires more contrast media.
B) Axial scanning has greater potential for misalignment between scans.
C) Axial scanning is more sensitive to patient motion.
D) Axial scanning results in poorer image quality. - Correct Answer more sensitive to patient motion
The number of detectors the scanner uses to collect data for a particular scan is determined by the:
A) scan field of view. B) display field of view. C) pitch. D) slice thickness. - Correct Answer SFOV
Using a wider display field of view results in:
, A) reduced noise. B) improved spatial resolution. C) anatomy appearing larger. D) increased patient
dose. - Correct Answer reduced noise
The depth of a voxel is determined by the:
A) field of view. B) slice thickness. C) matrix size. D) pixel size. - Correct Answer slice thickness
The range of CT numbers displayed in the reconstructed image is controlled by:
A) subject contrast. B) inherent contrast C) window width. D) window level. - Correct Answer window
width
All of the following types of exams typically use a large SFOV, except for:
A) chest exams. B) spine exams. C) extremity exams. D) skull exams. - Correct Answer skull
Matrix size never changes, but the pixel size can vary based on the selected: A) scan field of view. B)
pitch. C) kVp. D) mAs. - Correct Answer SFOV
The element of a photomultiplier tube that converts the initial pulse of light to electrons is the: '
A) semiconductor. B) photocathode. C) dynode. D) scintillator. - Correct Answer photocathode
The ability of a detector to produce the same output given the same input is called its: A)
reproducibility. B) efficiency. C) stability. D) dynamic range. - Correct Answer reproducibility
Compared to helical scanning, axial scanning is associated with reduced:
A) misregistration artifact. B) stair-step artifact. C) partial volume averaging. D) low-contrast
resolution. - Correct Answer low contrast resolution
The main goal of dual source CT is improved ________ resolution.
A) spatial B) temporal C) low-contrast D) high-contrast - Correct Answer spatial
During analog-to-digital conversion, the _______ selects segments of the analog signal for further
analysis.
A) sampler B) quantizer C) coder D) digitizer - Correct Answer sampler
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