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ppt. x-ray machine operation: the x-ray circuit Exam| Questions and Answers Verified 100% Correct
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ppt. x-ray machine operation: the x-ray circuit Exam| Questions and Answers Verified 100% Correct
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ppt. x-ray machine operation: the x-ray circuitExam| Questions and Answers Verified 100%
Correct
what type of rectifiers does the modern x-ray machine use? - ✔✔solid state rectifiers
-diodes
whats the other usage for rectifier? - ✔✔measure current through the mA meter
how many rectifiers does a half wave rectification need? - ✔✔0-2
what happens to the negative half during half wave rectification? - ✔✔its omitted
-60 Dc pulses
how many rectifiers are needed during full wave rectification? - ✔✔4
what happens to the negative half during full wave rectification? - ✔✔inverted to positive
-120 DC pulses
how many pulses/sec are in a three phase 6 pulse rectification? - ✔✔360 pulses/second
how many pulses/sec are in a three phase 12 pulse rectification? - ✔✔720 pulses/second
what does p-n junction talk about? - ✔✔opposite attract, like charges repel electrons
**producing an x-ray
, when should we use high mA vs low mA? - ✔✔involuntary motion
high mA shorten time
what type of timer do we use today? - ✔✔electronic timer
impulse timer - ✔✔shortest time possible 1/120th of a sec
synchronous timer - ✔✔shortest time possible 1/60th of a sec
Electronic Timers - ✔✔manual timer
-that is what we use today
-shortest time possible 1ms
Automatic exposure control - ✔✔pre-programmed
-terminates the exposure when a certain amount of radiation reaches film
-uses ionization chamber, photomultiplier tube or solid state detector
photomultiplier tube (PMT) - ✔✔when there is enough intensity, switch opens and
terminates the exposure
photo= light
multiply = increase light
why do we need to do it?
create electrons and current from it
why do we want a current? so we can get a signal/information
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