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13 Cards in this Set
- Front
- Back
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anatomically programmed radiography (APR) |
radiographic technique chart programmed into x-ray console, anatomy/body habitus indicated |
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factors that are selected by APR (6) |
kVp, mAs, AEC ionization chamber, FSS, tube, bucky |
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automatic exposure control regulates _ _ without technologist involvement |
exposure time |
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AEC |
radiation detection device that measures the quantity of x-rays received by the patient or IR. exposures reaches predetermined values the system terminates exposure. value set at installation based on receptor system and density desired |
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types of AEC |
phototimer, ionization chambers |
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phototimer is located |
under the cassette |
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ionization chambers are located |
under patient, above cassette |
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phototimber utilize |
photomultiplier tube |
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ionization chambers utilize |
a parallel plate ionization chamber, "cells" or "chambers" |
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minimum reaction time |
length of time necessary for AEC to respond to radiation and for generator to terminate exposure |
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back up time or mAs |
protects patient if AEC isn't working at 150% of expected mAs |
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back up activation (6) |
wrong detector selected, wrong tube selected, incorrect tube (bucky alignment), prostheses, lead shield, incorrect back up timer setting |
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factors that affect AEC |
patient position, ion chamber selection, density selector, collimation, image receptor speed, prosthesis, back up timer |
