objective of taking a radiograph
to achieve best diagnostic info with the least amount of radiation exposure
x ray is
a type of electromagnetic radiation that has a wave of high energy and a very short wavelength
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objective of taking a radiograph
to achieve best diagnostic info with the least amount of radiation exposure
x ray is
a type of electromagnetic radiation that has a wave of high energy and a very short wavelength
electromagnetic radiation 2 behaviors
travels in waves with a wavelength and frequency
behaves like particles
the shorter the wavelength
the higher the frequency
the more penetrating power it has
absorbed dose
the amount of energy transmited by ionizing x-rays to matter
dose equivalent
a measure of the biological damage to living tissue as a result of radiation exposure
gray
absorbed dose is measurement unit
sievert
dose equivalent measurement unit
maximum permissible dose
maximum dose of radiation that a person may be occupationally exposed to in a given amount of time without significant risk of side effects
occupationally exposed limit is
0.05 Sv
5 things needed to produce x-rays
vacuum containment area
target for electrons to strike
means of accelerating electrons
source of electrons
free electron path
cathode charge
negative
tungsten filament
in the cathode, when heated creates an electron cloud
focusing cup
in the cathode
made from molybdenum
contains the electron cloud
anode charge
positive
target
in the anode
made of tungsten
contains a focal spot
focal spot
the point of the target that electrons hit
x-rays and heat are produced when hit
rotating anodes
distribute heat better than stationary
produce more x rays
mA
voltage used to heat the filament
the more mA the more electrons and then xrays
kVp
measure of voltage of the step up ciurcut that accelerate the electrons to the target
the higher the kVp the better the penetrating power of the x rays