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RADT 456: Image Acq

ARRT registry review covering image acqusition and evaluation

what factors affect recorded detail SID,OID, focal spot size, patient factors, intensifying screens, and motion
factors describing distortion are magnification, elongation, and foreshortening
true or false: an increase in OID will increase magnification true
if you increase the SID what do you do to recorded retail increase
true or false: a smaller focal spot gives less recorded detail false
the angle of the anode can have a significant effect on recorded detail
to minimize involuntary motion you should use the shortest exposure time possible
an increase in phosphor size means in increase in screen speed
what is used to periodically evaluate screen contact specially designed wire mesh
what is the overall amount of blackening on an x-ray image or a portion of the image density
any combination of mA and exposure time that will produce a particular mAs, will produce the identical image density is known as reciprocity law
as distance is decreased, the intensity of the x-ray beam increases
an increase in image density results with an increase in kV
what is the most important way to reduce the production of scattered radiation collimate
you should use a grid when the body part measures 10 cm or greater
defined as the height of the lead strips compared with the distance between them grid ratio
the addition of a grid requires a significant increase in mAs
what increases the overall energy of the x-ray beam filtration
the primary beam has a total filtration of 2.5-mm Al equivalent
used to provide more uniform density when structures have different thickness/absorption properties compensating filter
what are examples of additive pathologic conditions ascites,rheumatoid arthritis, pneumonia, CHF
what are examples of destructive pathologic conditions osteoporosis,osteomalacia, emphysema, degenerative arthritis
an x-ray image that exhibits many shades of gray from white to black is described as long-scale contrast
what transforms the violet light emitted by the PSP into the image seen on the CRT the ADC
what component of an IP records the CR image photostimulable phosphor
the x-ray detection system that does not have a scintillation component is direct DR
what is usually adjusted to compensate for differences between single-phase and three-phase generators mAs
a decrease in developer temperature of what will produce a dramatic decrease in optimal density 2-3 degrees
high contrast is known as ______ and uses ____ kV short scale contrast, low
high contrast studies consist of bonework
low contrast studies consist of abdomen,chest
Created by: bmhedinger