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Chapter 7

SWGTC-R/T-Chapter 7-Wallace-Radiographic Contrast

degree of differences between radiographic densities radiogaphic contrast
black and white= ______ contrast/ _______scale high, short
grays /black= ________contrast, _______scale low, long
What causes subject contrast? atomic number differences, tissue density differences, thickness differences of patients body parts.
what absorbs the most x-rays? bone
What absorbs the least amount of x-rays? air
differential absorption tissues in the body absorb x-ray photons differently depending on their density.
a patient in <good/bad> physical shape will display the highest subject contrast good
the liver, pancreas, spleen, stomach, kidneys, bowel will display a <low/high> subject contrast low
3 most common contrast agents air, barium, iodine
adding air <increases/decreases> radiographic density decreases
What contrast agent would you use in the GI tract? Barium and/or air
What contrast agent would you use in the kidney or gallbladder? iodine
Main controlling factor for contrast? kVp
"p" in kVp peak
high kVp= _____photon energy high
high kVp= high photon energy= ______contrast, low scale low
excess density fog
high kVp= _____ scattered radiation= _____ contrast image more, low
as x-ray photons are absorbed, scattered, or pass through, the intensity of the beam is reduced. this is called _______. attenuation
Created by: kristinalyn