Rad Ch. 6 Vocab
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| 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.
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| Automatic Exposure Control (AEC) | An electronic circuit within the x-ray machine that automatically terminates the exposure time when a certain quantity of radiation has been detected at the IR.
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| Autotransformer | Its primary purpose is to vary the voltage to the primary side of the step-up transformer.
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| Back-up Time | A manually set time that insures that an exposure will be terminated should the automatic exposure control fail.
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| Control Console | The unit where the operator sets all of the exposure techniques, such as kilovolts peak, milliamperes, and exposure time.
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| Diode | An electronic device that permits current to flow in one direction only.
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| Electric ground | A device that absorbs or drains off excess electrical charges, resulting in zero electrical potential.
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| Exposure timer | A device that terminates the exposure by opening a switch after a preset time has elapsed.
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| Exposure switch | Closes the circuit, which allows current flow, creating voltage across the x-ray tube.
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| 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.
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| Full-wave rectification | The redirection of the second half of the electrical cycle so that current will flow in the same direction during both halves of the cycle.
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| Half-wave rectification | Negative voltage is suppressed so that the flow of current is only utilized during the positive flow of alternating current.
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| Heat units (HU) | Determined by multiplying the MAS by the KVp; Used to calculate cooling times.
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| High-frequency x-ray generator | These units employ special Ainverter circuits that convert rectified AC into a series of square pulses.
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| 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.
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