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Radiology

Chapter 6 Vocab - Part 1

QuestionAnswer
Anatomically Programmed Radiography (APR) A computerized control that is programmable so that exposure factors from a conventional technique chart can be made available from within the computer.
Automatic Exposure Control (AEC) An electronic circut within the x-ray machine that automatically terminates the exposure time when a certain quantity of radiation has been detected at the IR.
Autotransformer Its primary purpose is to vary the voltage to the primary side of the step-up transformer.
Back-up Time A manually set time that insures that an exposure will be terminated should the automatic exposure control fail.
Control Console The unit where the operator sets all of the exposure techniques, such as kilovolts peak, milliamperes, and exposure time.
Diode An electronic device that permits current to flow in one direction only.
Electric ground A device that absorbs or "drains off" excess electrical charges, resulting in zero electrical potential.
Exposure timer A device that terminates the exposure by opening a switch after a preset time has elapsed.
Exposure switch Closes the circuit, which allows current flow, creating voltage across the x-ray tube.
Electronic timer The most accurate form of manually set timers where exposure times are expressed in decimals. Designed for use with three-phase and high-frequency generators.
Full-wave rectification Redirecting the second half of the electrical cycle so that current will flow in the same direction during both halves of the cycle.
Half-wave rectification Negative voltage is suppressed so that the flow of current is only utilized during the positive flow of alternating current.
Heat units (HU) Determined by multiplying the mAs by the kVp. Used to calculate cooling times.
High-frequency x-ray generator These units employ special "inverter circuits" that convert rectified AC into a series of square pulses.
Ionization Chamber One type of automated exposure control where an enclosed volume of dry air is connected into a circuit. Located between the patient and the IR.
Created by: hollieritter
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