MEDRADSC 3S03 Lecture Notes - Lecture 5: Mediastinum, Angling, National Research Council (Canada)

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 3S03
• Professor: Dawn Danko

Document Summary

Skin sparing effect (electrons are in forward. Lying directly overtop of them motion before they deposit the dose) * as the electron energy increases, the surface dose increases, high dose at depth. * for photon beam, as energy increases, surface dose decreases, but higher energy at depth. Ele(cid:272)t(cid:396)o(cid:374) does (cid:374)ot have a poi(cid:374)t sou(cid:396)(cid:272)e, it"s a(cid:374) area. The calculation of absorbed dose (or dose rate) in tissue from ionizing radiation. Determine the dose to points other than the prescription point. Cal(cid:272)ulate the ti(cid:373)e (cid:396)e(cid:395)ui(cid:396)ed to delive(cid:396) a p(cid:396)es(cid:272)(cid:396)i(cid:271)ed dose (cid:894)i(cid:374) (cid:373)i(cid:374)s o(cid:396) (cid:373)u"s(cid:895) Establishes the dose rate or calibration factor (cf) at one specific point, under specific conditions; Linacs are calibrated to deliver a specific dose per mu (usually 1 cgy/mu) to a specific point (usually the isocentre) under specific conditions (i. e. calibration conditions). Establishes the dose under conditions other than calibration conditions; stated in relative terms. Sc, sp, %dd data, tpr, tmr, tar, oar factors.