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RADT 456: Image Acq
ARRT registry review covering image acqusition and evaluation
| Question | Answer |
|---|---|
| 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
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