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CT Registry Review - ARRT Questions and Answers Fully Solved
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CT Registry Review - ARRT
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CT Registry Review - ARRTAbsorbed dose - answer the amount of energy absorbed per unit mass
(grays or rads)
back projection - answer- 3rd step in IR loop of iterative reconstruction algorithm
- ray sum data are projected back onto a matrix.
blood urea nitrogen (BUN) - answer renal function (nitrogen in blood)
(7-25mg/dl)
bow-tie filter - answer Filter compensating for a cylindrical shape (body)
-filter is thicker at the ends
contiguous images - answer images with equal section thicknesses & reconstruction
intervals
Aliasing - answerstreak artifact caused by insufficient views (data samples) obtained
during data acquisition
Algorithm - answer(AKA kernal)
filter applied to raw data during reconstruction to remove blurring artifacts
Afterglow - answerdetector continues to glow after radiaiton is terminated (scintillation-
type scanners)
absorption efficiency - answerability of an individual CT detector to absorb & measure
the transmitted x-ray intensity incident upon it
ALARA - answerAs Low As Reasonably Achievable
Analog-to-Digital Converter (ADC) - answerconverts electrical signal to digital form
(part of the DAS)
array processor - answerreviews raw data & performs all major processing of image
arterial phase - answerpeak arterial enhancement following the bolus IV administration
of iodinated contrast material.
Artifact - answernoise on an image
ataxia - answerlack of muscle coordination
, Attenuation - answerreduction in intensity of a radiation beam as it passes through a
substance
attenuation coefficient - answervalue given to an object rating its ability to absorb an x-
ray beam
automatic tube current modulation (ATCM) - answersoftware used to adjust the mA
throughout an acquisition to reduce patient dose
Automatic Tube Voltage Selection (ATVS) - answersoftware used to adjust kVp based
on the changing attenuation along the scan range to reduce patient dose
beam hardening - answerthe increase in average energy of x-ray beam as it penetrates
tissue
contrast resolution - answerability to detect an object with a small difference in
attenuation from surrounding tissue
Contrast Induced Nephropathy (CIN) - answersubstantial decline in renal function after
a patient receives IV contrast
Convolution - answerfilter used to remove blurring artifact during back-projection
Creatinine - answerindication of renal function
(0.5-1.5mg/dl)
CT dose index (CTDI) - answeran approximate measure of the radiation dose received
in a single slice
cupping artifact - answerMiddle of the image appears darker than periphery.
data acquisition system (DAS) - answerelectronic components of a CT system
responsible for measuring the transmitted x-radiation absorbed by the detectors
Diastole - answerrelaxation phase of the heart
(bottom # of BP)
display field of view (DFOV) - answerscan factor measured from the center of the pt. to
the most distant edge of the pt.
dose length product (DLP) - answerdose for the entire series of images
DLP Equaision - answerDLP = CTDIvol x Scan length
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