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1 Cards in this Set

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  • 3rd side (hint)
4 R's of radiotherapy (why fractionate)
1. Redistribution
2. Repair
3. Repopulation
4. Reoxygenation
1. Redistribution
Cells more sensitive in mitotic phase, and by fractionating you catch more in the mitotic phase
2. Repair
normal tissue will repair between doses, cancer might not
3. Repopulation
allows normal cells time to repopulate
4. reoxygenation
allows time for cancer cells to become reoxygenated (center often crappy blood supply), making them sensitive again