Exam (elaborations)
CT Registry Review - ARRT.
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- ARRT Registry
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- ARRT Registry
CT Registry Review - ARRT.
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CT Registry Review - ARRT1st gen translate-rotate principle - ANS-1 degree for 180 degrees
abdominal aorta bifurcates at what level - ANS-L4
Absorbed dose - ANS-the amount of energy absorbed per unit mass
(grays or rads)
absorption efficiency - ANS-ability of an individual CT detector to absorb & measure the
transmitted x-ray intensity incident upon it
Afterglow - ANS-detector continues to glow after radiaiton is terminated
(scintillation-type scanners)
ALARA - ANS-As Low As Reasonably Achievable
Algorithm - ANS-(AKA kernal)
filter applied to raw data during reconstruction to remove blurring artifacts
Aliasing - ANS-streak artifact caused by insufficient views (data samples) obtained
during data acquisition
Analog-to-Digital Converter (ADC) - ANS-converts electrical signal to digital form
(part of the DAS)
analytic method of CT image recon - ANS-filtered back-projection & Fourier
Transformation
Angle for insertion of a butterfly needle - ANS-15 degrees
array processor - ANS-reviews raw data & performs all major processing of image
arterial phase - ANS-peak arterial enhancement following the bolus IV administration of
iodinated contrast material.
Artifact - ANS-noise on an image
artifact not affected by the operator - ANS-ring artifact
, artifact unique to MDCT - ANS-cone beam artifact
ataxia - ANS-lack of muscle coordination
Atrial Systole corresponds with with which portion of the cardiac cycle - ANS-P-wave
Attenuation - ANS-reduction in intensity of a radiation beam as it passes through a
substance
attenuation coefficient - ANS-value given to an object rating its ability to absorb an x-ray
beam
automatic tube current modulation (ATCM) - ANS-software used to adjust the mA
throughout an acquisition to reduce patient dose
Automatic Tube Voltage Selection (ATVS) - ANS-software used to adjust kVp based on
the changing attenuation along the scan range to reduce patient dose
back projection - ANS-- 3rd step in IR loop of iterative reconstruction algorithm
- ray sum data are projected back onto a matrix.
beam hardening - ANS-the increase in average energy of x-ray beam as it penetrates
tissue
Beam Width - ANS-The dimension of the primary beam in the longitudinal or z-axis -
controlled by the pre-patient collimator.
blood urea nitrogen (BUN) - ANS-renal function (nitrogen in blood)
(7-25mg/dl)
bow-tie filter - ANS-Filter compensating for a cylindrical shape (body)
-filter is thicker at the ends
Cardiac Diastole corresponds with with which portion of the cardiac cycle - ANS-T-wave
Cine CT acquisition involves - ANS-multiple axial scans at the same location
Claudicaiton - ANS-condition of intermittent cramping in the legs due to poor circulation
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