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adv img CT 2

advanced imaging - CT set 2

QuestionAnswer
What percentage of radiology exams are CT? 12% of diagnostics
What percentage of the US population’s radiation dose is due to CT? 45%
Axial CT alternate name conventional tomography
CT alternate name trans-axial
Who invented CT and when? Godfrey Houndsfeld in 1967
A voxel is also called what? a houndsfeld unit
What was the first CT unit installed? Where? England, 1969
What type of CT was the first one and who made it? A head unit by EMI
Major downfall of first generation CT scanners? long scan time
Major downfall of third generation CT scanners: ring artifact
What is significant about the second generation CT scanners? they used a fan-shaped beam
What is significant about the fourth generation CT scanners? detectors were stationary
Major downfall of fourth generation CT scanners? pt. dose
What are the advantages of the 5th generation CT scanner? faster, real time
Alternate name for 5th generation CT scanners electron beam tomography
What is significant about 6th generation CT scanners? they’re helical or “spiral” allowing continuous spin of the tube
What is the major advantage of 6th generation CT scanners? abdomen scan time is 30-45s.
What determines section thickness for the 6th gen CT scanner? detector
What do “slices” mean? number of images produced with one tube rotation
What is found in the gantry? x-ray tube, detector array, high voltage generator, couch and mechanical supports
Created by: annaluz87