Download Radiology Exam Questions and Answers: X-Ray Circuitry and Tube Components and more Exams Advanced Education in PDF only on Docsity!
LRA 222 FINAL EXAM QUESTIONS AND ANSWERS
First 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 frequencygenerators
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 thecycle. - Answer positive part of cycle Full wave rectification three phase units provide an x-ray beam at - Answer 360 pulsesper 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 highestquantity and quality Answer
The medical imaging industry standard for calculating high voltage generator power isto 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, filamenttransformer and rectifiers
Thermionic emission at the filament determines______ milliamperage across the x-raytube 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 voltagetransformer is - Answer amplitude
Differences in power supply sent to the x-ray machine is equalized by the - Answer linevoltage 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 enoughradiation has reached the image receptor
the focal spot is the - Answer source of radiation in the x-ray tube Each tube has its own tube rating chart to show - Answer maximum exposure times Extrafocal or off-focus radiation is produced from _____. - Answer rebounding electrons thermionic emission at the filament causes - Answer a space change The target of the rotating anode is usually coated with a _____ alloy. - Answer tungstenalloy
The effective focal spot size decreases with _____ target angle. -ANWER The most common cause of tube failure is _____.-ANWER tungsten vaporization High capacity tube rotors revolve at _____ rpm.-ANWER 10,000A dual focus tube has two _____. -ANWER filamentsThe negative side of the x-ray tube holds the _____. -ANWER filamentthe filament is made of _____ -ANWER
tungsten Formula for Heat Units is Units for a 3-phase 6-pulse x-ray machine is - Answer 1.35 xkVp x mA x seconds
Filament in an x-ray tube is about - Answer 1-2 cm in length The effective focal spot size is _______ than the actual focal spot size - Answer smaller
