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106 Final
| Question | Answer |
|---|---|
| The use of contrast agents increases the amount of ________________. | differential absorption, Compton scatter and photoelectric absorption |
| Because of differential absorption, about _____% of the incident beam from the x-ray tube contributes to the finished image. | 0.5 |
| Differential absorption in diagnostic imaging is primarily caused by ____________. | pair production |
| Compton interactions, photoelectric absorption, and transmitted x-rays all contribute to _________________. | differential absorption |
| ___________ occurs only at the very high energies used in radiation therapy and in nuclear medicine P.E.T. imaging. | Pair production |
| As kVp ___________, the probability of photoelectric absorption ______________. | increases; decreases |
| Only at energies above 10 MeV can _______________ take place. | photodisintegration |
| A negative contrast agent is _________. | air |
| X-ray beam energy is improved by ____________. | increasing filtration |
| The HVL is lowered by a decrease in ________. | kVp |
| A compensating filter is used to create ________ exposure with a body part of _________ thickness. | uniform; nonuniform |
| The main purpose of added filtration is to reduce ____________. | patient dose |
| X-ray intensity is directly proportional to _____. | mAs |
| Increasing kVp increases the _________ of an x-ray beam. | energy |
| X-ray quantity is _______ proportional to the ________ of the distance from the source. | inversely; square |
Created by:
cathrvn