Knowing Your Limits
Did you know that there is a maximum dose of radiation that has been determined for each human body organ? This is a lifetime limit called the organ tolerance dose because radiation damages the tiny blood vessels inside organs, causing them to progressively narrow and scar — a process called obliterative endarteritis. Over time, normal tissue is replaced by stiff, fibrous scar tissue that has little capacity to function or heal. These changes are largely irreversible (1). So, with few exceptions, radiation therapy is a once-and-done treatment. The image above is of my treatment plan with the different colors representing different levels of radiation being delivered. The red in the center is the highest dose and the blue at the outside the lowest. This means that my scalp received the least amount of radiation, and therefore the lowest side-effects, like skin redness and hair loss. That doesn't mean I didn't experience it at all, but it was limited as much as possible: ...