chapter 5 and 6 Flashcards
kVp
- kilo volt peak
- the highest voltage applied across the X-Ray tube
mAs
- milliamps per second
- current across the filament of X-Ray tube times the time the X-Rays are turned on (exposure time)
transformer
- definition
- equation
changes voltage to desired level (current changes in opposite direction)
- Vs/Vp = Ns/Np
HV transformer
convert household voltage to very high voltage
rectifier
converts AC voltage to DC
filter
thin wall designed to allow x-rays above a certain energy to escape
cathode
- definition
- location
- 2 parts
- source of e-
- negative side of the x-ray tube
- filament and focusing cup
filament
coil of wire that emits electrons when heated
focusing cup
-negatively charged so that it focuses the electron beam to a small area of the anode
anode
- location
- 2 types
- positive side
- stationary and rotating
stationary anode
used where high tube current and power are not required
-dentist
rotating anode
used in general purpose x-ray tubes because the tubes must be capable of producing high-intensity x-ray beams in a short times
target
- definition
- made of
area of the anode struck by the electrons from the cathide
-made of tungsten
protective housing
shields most x-rays except for primary beam and leakage
-filter and collimator
collimator
shields and narrows primary beam
