EXP ch 5 Flashcards
small focal spot sizes
25,50,100,200
large focal spot size
200,300,400,500,600,800,100,1200
ma setting
dtermines how hot filament gets
mas
total quantity of xray beam
___% change to see density
30%
3 usese of reciprocity law
control motion, small focal spot, breathing tech
invese square law
intensity is inversly proportionate to square of distance from source
sid is doubled the intensity is 4x _____: If sid is cut in half the intensity is 4x _____
4X
ionization chamber
measures intensity
sid doubled then mas increased ___ X: Sid cut in half then mas is decreased ___X
4X
high contrast-
Low Contrast
low kvp-black/white/short scale
high kvp-greys-long scale
subject contrast
differences in composition of patients body tissue
air fat water muscle bone enamel
less abosorbing power-more rad density
more absorb power-less rad density
major kvp vs minor kvp
changes kvp by 10
by 1 or 2
scatter lower ___
contrast
