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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...

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  • August 19, 2024
  • 19
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • helical scanning motion was first made possible by
  • the type of beam geometry used in modern ct scanne
  • the method of data acquisition gathers
  • when pitch is less than 1 the resulting bands of

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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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