advanced imaging - CT set 2
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| What percentage of radiology exams are CT? | 12% of diagnostics
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| What percentage of the US population’s radiation dose is due to CT? | 45%
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| Axial CT alternate name | conventional tomography
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| CT alternate name | trans-axial
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| Who invented CT and when? | Godfrey Houndsfeld in 1967
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| A voxel is also called what? | a houndsfeld unit
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| What was the first CT unit installed? Where? | England, 1969
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| What type of CT was the first one and who made it? | A head unit by EMI
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| Major downfall of first generation CT scanners? | long scan time
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| Major downfall of third generation CT scanners: | ring artifact
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| What is significant about the second generation CT scanners? | they used a fan-shaped beam
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| What is significant about the fourth generation CT scanners? | detectors were stationary
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| Major downfall of fourth generation CT scanners? | pt. dose
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| What are the advantages of the 5th generation CT scanner? | faster, real time
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| Alternate name for 5th generation CT scanners | electron beam tomography
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| What is significant about 6th generation CT scanners? | they’re helical or “spiral” allowing continuous spin of the tube
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| What is the major advantage of 6th generation CT scanners? | abdomen scan time is 30-45s.
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| What determines section thickness for the 6th gen CT scanner? | detector
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| What do “slices” mean? | number of images produced with one tube rotation
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| What is found in the gantry? | x-ray tube, detector array, high voltage generator, couch and mechanical supports
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