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Chapter 7
SWGTC-R/T-Chapter 7-Wallace-Radiographic Contrast
| Question | Answer |
|---|---|
| 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
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