Lec 2 Flashcards
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3 conditions for producing x rays
source of e-, voltage driving force, target material
anode is blank and cathode is blank
+, -
most common target material in x rays
tungsten
energy lost by electron changing direction due to nucleus
bremsstrahlung radiation “x ray”
energy lost by electron changing direction from hitting another electron
characteristic radiation “x ray”
an electron hitting the nucleus creates blank energy transfer
maximum
quantity of radiation and exposure time are blank related
directly/linearly
area under the curve of photon energy vs relative number of photons
quantity of radiation
a deadman switch on the timer of the xray machine is what activates xray blank
impulses
aiming cylinder of the x ray machine is called
collimating tube (position indicating device) (beam indicating device)
high image density show up as blank on the film and the structures are called blank
dark, radiolucent
low image density show up as blank on the film and the structures are called blank
light, radiopaque
tooth enamel is blank
radiopaque
differentiation between light and dark
contrast
clarity of structures outlines
sharpness
few shades of gray
high contrast (short scale)
many shades of gray
low contrast (long scale)
lower energy in kVp causes blank contrast
high
higher energy in kVp causes blank contrast
low
technical term for unsharpness
penumbra
a better machine will have a blank
small focal spot
penumbra is going to show up more if the object is blank the source
closer to
way to accurately calibrate the penetrating ability of radiation from an x ray machine… aluminum is used
half value layer
half value layer is the thicknes of aluminum required to reduce beam intensity by blank
50%
intensity of radiation varies inversely as the blank
inverse square law (1/d^2)
