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Terms in this set (37)
Rotate-rotate geometry principle CT scanner with a fan beam.
Classified a high-speed CT scanner with Electron Beam scanning instead of traditional x-ray beam,
Detector array consists of two separate rings in a 260 degree arc.
Fifth generation or electron beam
This generation of scanners were developed to suppress ring artifacts. Consisted of rotating fan beam within circular stationary ring of detectors.
This CT scanner utilized pencil-beam shaped x-ray with a translate-translate principle.
This generation of CT scanner was only capable of scanning the head.
First CT scanner capable of scanning full body.
This generation CT scanner employed the translate-translate principle with a fan beam.
This generation CT scanner are known as dual source in an effort to improve temporal resolution.
This scanner has two x-ray tubes coupled to two detector systems.
Sixth generational scanners employ two DAS off set by 90 degrees. The first detector has a SFOV ______ and the second has a SFOV_____.
The purpose of fifth generation/electron beam scanners is____________.
The purpose of sixth generation/dual source scanners is to improve_______________.
temporal and spacial resolution
This gen utilizes image reconstruction including: subtraction method and beam hardening elimination.
Thickness of object
Lambert-Beer Law =
Complete purpose of CT is to find the value ___ in Lambert-Beer Law.
Current CT generators have a maximum power of ____
CT uses _______ generators.
Scintillation detectors convert x-ray energy into _____. Then that is converted into electrical energy.
Detector array-several small detectors of the same dimension are arranged in rows of identical thickness.
Detector array-detector width gradually increases in thickness as it moves away from the center of axis rotation.
Detector array-composed of thin detectors at the center and thick detectors on either side of the central detectors.
A group of detector electronics that measures the transmitted radiation beam, encodes these measurements into binary data, and transmits binary data to the computer.
data acquisition system
_______ slice thickness aids in reducing the aliasing artifact related to under sampling.
Purpose of ____________ collimation is to reduce patient dose and minimize penumbra caused by focal spot size.
Prepatient collimation is found between _____ and ______.
xray tube patient
Purpose of ________ collimation is to define slice thickness and minimize signal contribution scatter radiation.
Post patient collimators are fixed and found between _____ after the attenuation through the patient.
Number of detector rows x detector aperture size=
beam collimation width
Extension of the computer's arithmetic logic unit capable of performing simultaneous computations.
CT architectures accommodate fast image reconstruction, networking functions, and archiving image data.
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