SWGTC-R/T-Chapter 7-Wallace-Radiographic Contrast
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| degree of differences between radiographic densities | radiogaphic contrast
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| black and white= ______ contrast/ _______scale | high, short
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| grays /black= ________contrast, _______scale | low, long
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| What causes subject contrast? | atomic number differences, tissue density differences, thickness differences of patients body parts.
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| what absorbs the most x-rays? | bone
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| What absorbs the least amount of x-rays? | air
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| differential absorption | tissues in the body absorb x-ray photons differently depending on their density.
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| a patient in <good/bad> physical shape will display the highest subject contrast | good
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| the liver, pancreas, spleen, stomach, kidneys, bowel will display a <low/high> subject contrast | low
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| 3 most common contrast agents | air, barium, iodine
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| adding air <increases/decreases> radiographic density | decreases
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| What contrast agent would you use in the GI tract? | Barium and/or air
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| What contrast agent would you use in the kidney or gallbladder? | iodine
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| Main controlling factor for contrast? | kVp
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| "p" in kVp | peak
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| high kVp= _____photon energy | high
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| high kVp= high photon energy= ______contrast, low scale | low
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| excess density | fog
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| high kVp= _____ scattered radiation= _____ contrast image | more, low
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| as x-ray photons are absorbed, scattered, or pass through, the intensity of the beam is reduced. this is called _______. | attenuation
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