Quizlet Physics Ch. 5

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  1. autotransformer: supplied with 220v from primary circuit; taps used to alter kVp; voltage provided to autotransformer is the primary voltage; also provides voltage to filament transformer
  2. characteristics of overhead suspension: two sets of ceiling mounted rails; most flexible; most expensive; telescoping column
  3. dead man exposure switches: finger has to be on switch to continue action
  4. electronic: resistor; length of exposure is determined by the time required to charge a capacitor through a selected variable resistance; time is varied by changing the resistance in the circuit; accurately measure times as short as 1ms
  5. exposure switch: anode must bea at correct speed before exposure is taken; exposure switch must be connected to the control console so that operator cannot be exposed (law); equipment is designed to prevent the tube from being manipulated into a position that will expose the operator, exposure switches must be of "dead man" type
  6. incoming line current: 110-120v @ 60 Hz
  7. kVp adjustment: selects appropiate taps on the autotransformer; allows for selection of penetrating power of x-ray beam; pre-reading voltmeter
  8. line compensator: a meter for measure of voltage supplied to unit; control to precisely adjust voltage; automatic on newer radiographic units; in line before autotransformer
  9. main x-ray circuit: modifies the incoming power to the proper form to supply the x-ray tube
  10. mechanical timer circuit: rare, spring driven, inaccurate old
  11. most widely used type of timer circuit: electronic
  12. pre-reading voltmeter: pre-reads voltage before voltage before it goes to high voltage transformer; part of kVp adjustment
  13. pulse-counting timer circuit: crystal oscillations at a determined frequency, would vibrate crystals at specific frequnces and the it would measure the # of vibrations
  14. single phase power: full wave rectification; 100% voltage ripple; 120 pulsations per sec.
  15. special circuitry that will evalute the combination of mA, time, and/or kVp section for: heat loading, and legal exposure limits
  16. synchronous timer circuit: timing related to frequency of electric current
  17. table ancillary equipment: foot board; shoulder supports; handgrips; compression band
  18. table bucky tray: holds cassettes; grid; phototiming equipment AEC
  19. table top: radiolucent; flat or curved top; smooth easily cleaned hard surface; motor driven or floating
  20. table units: Fixed-diagnostic only; may have adjustable height Tilting-r&f rooms; may be described by tilting capabilities; fixed height to high for pt.
  21. three phase power: incoming full-wave rectified current sequenced at 120 degrees; resulting in a six-pulse waveform; three phase, six pulse,;360 pulses per sec; voltage never drops to zero; three phase, twelve pulse
  22. timer circuit: in line on primary side of high voltage transformer
  23. types of timer circuits: mechanical; synchronous; pulse-counting; electronic
  24. types of tube support: overhead suspension; floor to ceiling; floor suspension; mobile; c-arm; head units; other-mammo, tomo, panoramic, CT, urologic