Part 1 Flashcards
Type of algorithm used for MSCT image reconstruction in which data acquired from a shorter distance (180 degrees) away from the reconstructed slice location are interpolated?
180- degree Linear Interpolation
What does 180LI stand for?
180- degree Linear Interpolation
Type of algorithm used for MSCT image reconstruction in which two sets of projection data acquired 360 degrees apart are used to form an image at a precise z-axis location?
360-degree Linear Interpolation
What does 360LI stand for?
360-degree Linear Interpolation
The amount of x-ray energy absorbed in a unit of mass?
Absorbed Dose
What is absorbed dose measure in?
Grays (Gy)
What does Gy stand for?
Grays
The ability of an individual CT detector to absorb and measure the transmitted x-ray intensity incident upon it?
Absorption Efficiency
What is primarily controlled by the characteristics and physical makeup of the detector material?
Absorption Efficiency
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?
Adaptive Array
Cone beam correction algorithm utilized to overcome potential attenuation calculation errors from the divergent beam of MSCT systems?
Advanced Single-Slice Rebinning (ASSR) Algorithm
What does ASSR stand for?
Advanced Single-Slice Rebinning (ASSR) Algorithm
The tendency of a scintillation-type CT detector to continue to glow in response to x-radiation after the exposure source has been terminated?
Afterglow
Quantification of the volume of density of calcium within the coronary arteries?
Agatston Score
What does CAC stand for?
Coronary Artery Calcification
As calculated during a CT coronary artery calcification (CAC) examination, the __________ __________ is used to indicate a patient’s risk of suffering a cardiac event.
Agatston Score
Acronym for as low as reasonably achievable, the cardinal principal of radiation dose reduction for all radiologic procedures, including CT?
ALARA
Mathematical filter applied to raw data during CT image reconstruction to remove blurring artifact inherent to back-projection?
Algorithm
What is also referred to as a kernel?
Algorithm
A form of streak artifact caused by an insufficient number of views (data samples) obtained during data acquisition?
Aliasing
What is another name for an insufficient number of views?
Data samples
What does DAS stand for?
Data Acquisition System
What does ADC stand for?
Analog-to-Digital Converter
Component of the data acquisition system (DAS) responsible for converting the electronic signal emitted by the CT detectors into digital form?
Analog-to-Digital Converter (ADC)
What does hard refer to?
Film
What does soft refer to?
Digital
What is the storage of Ct data in either hard (film), or soft (digital) form?
Archival
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?
Array Processor (AP)
Period of peak arterial enhancement following the bolus IV administration of iodinated contrast material?
For example, the hepatic arterial phase occurs approximately 25 to 35 seconds after the initiation of contrast agent administration.
Arterial Phase
When does the hepatic arterial phase occur?
Approximately 25 to 35 seconds after the initiation of contrast agent administration
A form of noise n the CT image resulting from errors during the measurement of transmitted radiation by the detectors?
Artifact
The reduction in intensity of a radiation beam as it passes through a substance?
Attenuation
The value assigned to an object quantifying its ability to attenuate an x-ray beam?
Attenuation Coefficient
Ct system software used to adjust the mA throughout an acquisition to reduce patient radiation dose to a minimum?
Automatic Tube Current Modulation (ATCM)
What does ATCM stand for?
Automatic Tube Current Modulation (ATCM)
