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CT TUFFEST STUFF REGISTRY REVIEW QUESTIONS AND ANSWERS 100% CORRECT
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CT TUFFEST STUFF REGISTRY REVIEW
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CT TUFFEST STUFF REGISTRY REVIEWWhich of the following interactions is most responsible for patient dose in diagnostic
imaging?
a) Bremsstrahlung
b) Photoelectric
c) Characteristic
d) Comptom - answerB) Photoelectric
Which of the following units could be used to expresses the patient dose experienced
with CT procedures?
1) mR
2) C/kg
3) mrad
4) mGy
5) mSv
6) mrem - answer3 & 4 mrad and mGy
Technologist dose is expressed with which of the following units?
a) R or C/kg
b) rad or gray
c) rem or seivert
d) rep or ren - answerc) rem or seivert
Contrast resolution is maximized in CT most likely because the effects of which of the
following interactions are minimized?
a) Bremsstrahlung interactions
b) Characteristic
c) Compton Scatter
d) Photoelectric Effect - answerc) Compton Scatter
Which of the following is the most influential factor regarding the production of scatter
radiation?
a) kVp
b) field size
c) part thickness
d) focal spot size - answerb) field size
The production of scatter increases, as which of the following increases?
1) Field size
2) Part Thickness
3) kVp - answer1 thru 3 Field size, Part Thickness, kVp
,Which of the following geometries is most responsible for modern MDCT?
a) Third generation
b) Fourth generation
c) Fifth generation
d) EBCT - answera) Third generation
"Translate-Rotate" is in reference to which of the following generations of CT
geometries?
1) First
2) Second
3) Third
4) Fourth - answerb) 1 & 2 only First and Second
Which of the following statements is TRUE regarding the voxel?
a) Voxels are what we look at on the image display monitor.
b) Each voxel is assigned or designated a specific shade of density for each CT image.
c) Selecting the correct voxel leads to selecting the correct slice thickness.
d) Unlike a pixel a voxel possesses a "Z" axis. - answerd) Unlike a pixel a voxel
possesses a "Z" axis
Photons that pass through objects unimpeded most likely are related to which of the
following?
1) black densities
2) high CT numbers
3) white densities
4) low CT numbers - answerc) 1 &4 Black densities and Low CT numbers
With regard to attenuation, the quantity of photon interaction depends on which of the
following?
1) Part thickness
2) Object density
3) Part atomic number
4) kVp - answerd) 1 thru 4 Part Thickness, Object density, Part atomic number, kVp
Which of the following components specifically allows continuous rotation of the gantry
during MDCT procedures?
a) The ADC
b) Slip ring technology
c) The generator
d) 3rd or 4th generation geometry - answerb) Slip ring technology
Which of the following generator types is most commonly utilized in modern MDCT?
a) single phase, 2 pulse
b) single phase, high frequency
c) three phase. 6 pulse
d) three phase, 12 pulse - answerb) single phase, high frequency
, Relative to the modern CT imaging chain, within which of the following components are
EM energies converted to electrical impulses?
a) the solid state photodiode detector
b) the xenon gas detector
c) the ADC
d) the Array Processor - answera) the solid state photodiode detector
Within which of the following components is raw data converted to image data?
a) the ADC
b) the detector system
c) the DAC
d) the Array Processor - answerd) the Array Processor
Which of the following is a function of the bowtie filter used in modern MDCT?
1) Minimizes beam hardening artifact
2) Reduces radiation dose via skin sparing
3) Shapes the x-ray beam by removing low energy photons
4) Helps to control slice thickness - answer1 thru 3 only Minimizes beam hardening
artifact, Reduces radiation dose via skin sparing, Shapes the x-ray beam by removing
low energy photons
Which of the following is a function of the system of collimation in modern MDCT
systems?
1) Restricts the beam to a specific area
2) Reduces the production of scatter radiation
3) Improves contrast resolution
4) Assists in controlling slice thickness
5) Can be used to minimize patient dose - answer1 thru 5
Which of the following scanning modes results in the highest image quality CT
scanning?
a) Dynamic scanning
b) Axial scanning
c) Helical scanning
d) High resolution scanning - answerb) Axial scanning
During axial scanning, when the patient breathes differently with each scan acquisition,
which of the following would most likely be the result?
a) Inter-scan delay
b) Misregistration artifact
c) Motion artifact
d) Partial volume effect - answerb) Misregistration artifact
Which of the following is an advantage of helical geometry versus axial scanning?
1) The ISD is eliminated
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