LRA- 222 Final Questions and Answers

LRA- 222 Final Questions and Answers The three main parts of the x-ray imaging system are the x-ray tube, ___ , and ____ - Answer-operating console, high voltage generator The step-up transformer increases voltage ____ times - Answer-500-1000 The x-ray beam generated by the circuit with the ___ voltage ripple has the ____ - Answer-Lowest, highest What is the industry standard formula for calculating high voltage generator power - Answer-power = max mA (@100 kVp and 100 ms) 100 kVp Most mammography units operate with _____ generators. - Answer-high frequency The principal disadvantage of three-phase equipment is - Answer-to cost The high voltage generator contains the high voltage transformer, the ____, and the _____ - Answer-filament transformer, rectifiers Thermionic emission at the filament determines the _____ across the x-ray tube during an exposure. - Answer-milliamperage A diode allows electrons to flow from _____. - Answer-cathode to anode The mAs timer is usually set to give the ____ mA at the ____ time - Answer-highest, shortest The difference in the waveform between the primary and secondary sides of the high voltage transformer is ____ - Answer-amplitude Variations in power distribution to the x-ray machine are corrected by the _____. - Answer-line voltage compensator The most accurate type of timer is the ____ timer - Answer-electronic In modern imaging systems, the components for rectification are ____ - Answer-solid state semiconductors The automatic exposure control (AEC) terminates the exposure when _____ - Answer-sufficient radiation reaches the image receptor