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adv img CT 1

advanced imaging - CT set 1

Narrow window width produces what? short scale
Wide window width produces what? long scale
Window allows the viewer to alter what? contrast
Window level controls what? density
Window width controls what? contrast
BUN number range for contrast: 7-18
Creatnine number range for contrast: .6-1.5
A “viscous” material is: thick
CTDI dose to pt within the primary beam
MSAD average dose pt receives during an exam
Noise in CT is: the variation in CT numbers above and below 0
Linearity: calibration of CT scanner so that water = 0
Most important component of the CT QC program is: spatial resolution test (bar or hole pattern)
Laser localizer for CT should be how accurate? to within +/- 1mm
How does pt dose change with slice thickness? thinner slices = more pt dose
Scintillation detector made of crystal with 50% detector efficiency. Most common.
Pre-patient collimation controls: pt dose
Postpatient (pre-detector) collimation controls: slice thickness
How must the CT computer be stored? in a cool dry place, under 68 degrees and 30% relative humidity
Formula for pixel size FOV / matrix size
Formula for voxel pixel size X slice thickness
CT numbers +1000 represent : hard bone
CT numbers -1000 represent: air
Ct numbers 0 represent : water
CT number range for lung tissue: -250 to -850
CT number range for blood fluid: +25 to +50
Created by: annaluz87 on 2009-08-06

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