Exam (elaborations)
LRA 222 FINAL EXAM QUESTIONS AND ANSWERS
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LRA 222 FINAL EXAM QUESTIONS AND ANSWERS...
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LRA 222 FINAL EXAM QUESTIONS AND ANSWERSFirst component in the x-ray circuit is the ________. Answer autotransformer
A step-down transformer is located in the ________. Answer filament circuit
Voltage across the x-ray tube is the most constant with ________. Answer high frequency
generators
Filament circuit provides electrons for the ________. Answer x-ray tube current
The operating console contains circuits that are ________. Answer low voltage only
A single-wave rectification ________. Answer has 100% ripple
Half-wave rectification current flows through the x-ray tube during the _____ part of the
cycle. - Answer positive part of cycle
Full wave rectification three phase units provide an x-ray beam at - Answer 360 pulses
per second
three main parts of the x-ray imaging system - Answer x-ray tube, operating console,
high voltage generator
step up transformer increases voltage - Answer 500-1000 times
X-ray beam generated by the circuit with the lowest voltage ripple has the highest
quantity and quality Answer
The medical imaging industry standard for calculating high voltage generator power is
to use the Answer maximum tube current at 100 kVp and 100ms
, Mammography units operate with the Answer high frequency generators
The major disadvantage of three-phase equipment is Answer cost
The high voltage generator contains______ high voltage transformer, filament
transformer and rectifiers
Thermionic emission at the filament determines______ milliamperage across the x-ray
tube during an exposure
A diode allows electrons to flow from______ Cathode to anode
The mAs timer is usually set to give the______ highest mA at the shortest amount of time
the change in waveform from the primary to secondary side of the high voltage
transformer is - Answer amplitude
Differences in power supply sent to the x-ray machine is equalized by the - Answer line
voltage compensator
The timer of maximum accuracy is the - Answer electronic timer
The rectification components in most contemporary imaging systems are _____. -
Answer solid state state semiconductors
the automatic exposure control (AEC) - Answer stops the exposure when enough
radiation has reached the image receptor
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