Absorbed dose correct answers the amount of energy absorbed per unit mass
(grays or rads)
back projection correct answers - 3rd step in IR loop of iterative reconstruction algorithm
- ray sum data are projected back onto a matrix.
blood urea nitrogen (BUN) correct answers renal function (ni...
Aliasing correct answers streak artifact caused by insufficient views (data samples) obtained
during data acquisition
Algorithm correct answers (AKA kernal)
filter applied to raw data during reconstruction to remove blurring artifacts
Afterglow correct answers detector continues to glow after radiaiton is terminated
(scintillation-type scanners)
absorption efficiency correct answers ability of an individual CT detector to absorb &
measure the transmitted x-ray intensity incident upon it
ALARA correct answers As Low As Reasonably Achievable
Analog-to-Digital Converter (ADC) correct answers converts electrical signal to digital form
(part of the DAS)
array processor correct answers reviews raw data & performs all major processing of image
arterial phase correct answers peak arterial enhancement following the bolus IV
administration of iodinated contrast material.
Artifact correct answers noise on an image
ataxia correct answers lack of muscle coordination
Attenuation correct answers reduction in intensity of a radiation beam as it passes through a
substance
attenuation coefficient correct answers value given to an object rating its ability to absorb an
x-ray beam
, automatic tube current modulation (ATCM) correct answers software used to adjust the mA
throughout an acquisition to reduce patient dose
Automatic Tube Voltage Selection (ATVS) correct answers software used to adjust kVp
based on the changing attenuation along the scan range to reduce patient dose
beam hardening correct answers the increase in average energy of x-ray beam as it penetrates
tissue
contrast resolution correct answers ability to detect an object with a small difference in
attenuation from surrounding tissue
Contrast Induced Nephropathy (CIN) correct answers substantial decline in renal function
after a patient receives IV contrast
Convolution correct answers filter used to remove blurring artifact during back-projection
Creatinine correct answers indication of renal function
(0.5-1.5mg/dl)
CT dose index (CTDI) correct answers an approximate measure of the radiation dose
received in a single slice
cupping artifact correct answers Middle of the image appears darker than periphery.
data acquisition system (DAS) correct answers electronic components of a CT system
responsible for measuring the transmitted x-radiation absorbed by the detectors
Diastole correct answers relaxation phase of the heart
(bottom # of BP)
display field of view (DFOV) correct answers scan factor measured from the center of the pt.
to the most distant edge of the pt.
dose length product (DLP) correct answers dose for the entire series of images
DLP Equaision correct answers DLP = CTDIvol x Scan length
dual-source CT correct answers system that consists of two seperate x-ray tubes and detector
arrays mounted 90 degrees from each other within the gantry
edge gradient correct answers streak artifact that occurs at the interface between a high-
density object and the lower-attenuation material surrounding it
(penumbra)
effective dose correct answers approximate relative risk from exposure to radiation
(sieverts or rem - 1Si=100rem)
EBCT correct answers -used for cardiac imaging
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