Mosby's Exam Review for CT 2026
Questions and Answers
180-dgree linear interpolation (180 LI) - Correct answer-Type of algorith used for
MSCT image reconstruction in which data acquired from a shorter distance (180
degrees) away from the reconstructed slice location are interpolated.
absorbed dose - Correct answer-the amount of x-ray energy absorbed in a unit of
mass. It is measured in grays. (Gy)
360-degree linear interpolation (360 LI) - Correct answer-type of algorithm used
for MSCT image reconstruction in which two sets of projection data acquired 360
degress apart are used to form an image at a precise z-axis location.
absorptopm efficiency - Correct answer-the ability of an individual CT detector to
absorb and measure the transmitted x-ray intensity incident upon it. primarilly
controlled by the characteristics and physical makeup of the detector material.
adaptive array - Correct answer-the type of MSCT detector array configured with
the thinnest detectors at the center, surrounded by detectors of incrementally
increasing widths along the z-axis.
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,advanced single-slice rebinning (ASSR) algorithm - Correct answer-cone beam
correction algorithm used to overcome potential attenuation calculation errors from
the divergent beam of MSCT systems.
afterglow - Correct answer-the tendency of a scintillation-type CT detector to
continue to glow in response to x-radiation after the exposure source has been
terminated.
Agatston score - Correct answer-quantification of the volume and density of
calcium within the coronary arteries. as calculated a CT coronary artery
calcification (CAC) examination, the Agatston score is used to indicate a patient's
risk of suffering a cardiac event.
ALARA - Correct answer-acronym for "as low as reasonably achievable," the
cardinal principle of radiation dose reduction for all radiologic procedures,
including CT.
algorithm - Correct answer-mathematical filter applied to raw data during image
reconstruction to remove blurring artifact inherent to back-projection. may also be
referred to as kernel.
aliasing - Correct answer-a form of streak artifact caused by an isufficient number
of views (data samples) obtained during data acquisition.
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, analog-to-digital converter - Correct answer-component of the data acquisition
system (DAS) responsible for converting the electronic signal emitted by the CT
detectors into digital form.
archival - Correct answer-the storage of CT data in either hard (film) or soft
(digital) form.
array processor - Correct answer-component of the CT computer system
responsible for receiving raw scan data, performing all of the major processing of
the CT image, and returning the reconstructed image to the storage memory of the
host computer.
arterial phase - Correct answer-period of peak arterial enhancement following the
bolus IV administration of iodinated contrast materia. for example, the hepatic
arterial phase occurs approximately 25-35 seconds after the initiation of contrast
agent administration.
Artifact - Correct answer-a form of noise on the CT image resulting from errors
during the measurement of transmitted radiation by the detectors.
attenuation - Correct answer-the reduction in intensity of a radiation beam as it
passes through a substance.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Questions and Answers
180-dgree linear interpolation (180 LI) - Correct answer-Type of algorith used for
MSCT image reconstruction in which data acquired from a shorter distance (180
degrees) away from the reconstructed slice location are interpolated.
absorbed dose - Correct answer-the amount of x-ray energy absorbed in a unit of
mass. It is measured in grays. (Gy)
360-degree linear interpolation (360 LI) - Correct answer-type of algorithm used
for MSCT image reconstruction in which two sets of projection data acquired 360
degress apart are used to form an image at a precise z-axis location.
absorptopm efficiency - Correct answer-the ability of an individual CT detector to
absorb and measure the transmitted x-ray intensity incident upon it. primarilly
controlled by the characteristics and physical makeup of the detector material.
adaptive array - Correct answer-the type of MSCT detector array configured with
the thinnest detectors at the center, surrounded by detectors of incrementally
increasing widths along the z-axis.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,advanced single-slice rebinning (ASSR) algorithm - Correct answer-cone beam
correction algorithm used to overcome potential attenuation calculation errors from
the divergent beam of MSCT systems.
afterglow - Correct answer-the tendency of a scintillation-type CT detector to
continue to glow in response to x-radiation after the exposure source has been
terminated.
Agatston score - Correct answer-quantification of the volume and density of
calcium within the coronary arteries. as calculated a CT coronary artery
calcification (CAC) examination, the Agatston score is used to indicate a patient's
risk of suffering a cardiac event.
ALARA - Correct answer-acronym for "as low as reasonably achievable," the
cardinal principle of radiation dose reduction for all radiologic procedures,
including CT.
algorithm - Correct answer-mathematical filter applied to raw data during image
reconstruction to remove blurring artifact inherent to back-projection. may also be
referred to as kernel.
aliasing - Correct answer-a form of streak artifact caused by an isufficient number
of views (data samples) obtained during data acquisition.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, analog-to-digital converter - Correct answer-component of the data acquisition
system (DAS) responsible for converting the electronic signal emitted by the CT
detectors into digital form.
archival - Correct answer-the storage of CT data in either hard (film) or soft
(digital) form.
array processor - Correct answer-component of the CT computer system
responsible for receiving raw scan data, performing all of the major processing of
the CT image, and returning the reconstructed image to the storage memory of the
host computer.
arterial phase - Correct answer-period of peak arterial enhancement following the
bolus IV administration of iodinated contrast materia. for example, the hepatic
arterial phase occurs approximately 25-35 seconds after the initiation of contrast
agent administration.
Artifact - Correct answer-a form of noise on the CT image resulting from errors
during the measurement of transmitted radiation by the detectors.
attenuation - Correct answer-the reduction in intensity of a radiation beam as it
passes through a substance.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
