ARRT REGISTRY EXAM REVIEW 2026
COMPREHENSIVE STUDY GUIDE SOLVED
QUESTION BANK
◉ 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. Answer: streak 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. Answer: detector continues to glow after radiaiton is
terminated (scintillation-type scanners)
◉ absorption efficiency. Answer: ability of an individual CT detector to
absorb & measure the transmitted x-ray intensity incident upon it
◉ ALARA. Answer: As Low As Reasonably Achievable
◉ Analog-to-Digital Converter (ADC). Answer: converts electrical
signal to digital form
(part of the DAS)
◉ array processor. Answer: reviews raw data & performs all major
processing of image
◉ arterial phase. Answer: peak arterial enhancement following the bolus
IV administration of iodinated contrast material.
◉ Artifact. Answer: noise on an image
◉ ataxia. Answer: lack of muscle coordination
, ◉ Attenuation. Answer: reduction in intensity of a radiation beam as it
passes through a substance
◉ attenuation coefficient. Answer: value given to an object rating its
ability to absorb an x-ray beam
◉ automatic tube current modulation (ATCM). Answer: software used to
adjust the mA throughout an acquisition to reduce patient dose
◉ Automatic Tube Voltage Selection (ATVS). Answer: software used to
adjust kVp based on the changing attenuation along the scan range to
reduce patient dose
◉ beam hardening. Answer: the increase in average energy of x-ray
beam as it penetrates tissue
◉ contrast resolution. Answer: ability to detect an object with a small
difference in attenuation from surrounding tissue
◉ Contrast Induced Nephropathy (CIN). Answer: substantial decline in
renal function after a patient receives IV contrast
COMPREHENSIVE STUDY GUIDE SOLVED
QUESTION BANK
◉ 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. Answer: streak 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. Answer: detector continues to glow after radiaiton is
terminated (scintillation-type scanners)
◉ absorption efficiency. Answer: ability of an individual CT detector to
absorb & measure the transmitted x-ray intensity incident upon it
◉ ALARA. Answer: As Low As Reasonably Achievable
◉ Analog-to-Digital Converter (ADC). Answer: converts electrical
signal to digital form
(part of the DAS)
◉ array processor. Answer: reviews raw data & performs all major
processing of image
◉ arterial phase. Answer: peak arterial enhancement following the bolus
IV administration of iodinated contrast material.
◉ Artifact. Answer: noise on an image
◉ ataxia. Answer: lack of muscle coordination
, ◉ Attenuation. Answer: reduction in intensity of a radiation beam as it
passes through a substance
◉ attenuation coefficient. Answer: value given to an object rating its
ability to absorb an x-ray beam
◉ automatic tube current modulation (ATCM). Answer: software used to
adjust the mA throughout an acquisition to reduce patient dose
◉ Automatic Tube Voltage Selection (ATVS). Answer: software used to
adjust kVp based on the changing attenuation along the scan range to
reduce patient dose
◉ beam hardening. Answer: the increase in average energy of x-ray
beam as it penetrates tissue
◉ contrast resolution. Answer: ability to detect an object with a small
difference in attenuation from surrounding tissue
◉ Contrast Induced Nephropathy (CIN). Answer: substantial decline in
renal function after a patient receives IV contrast
