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