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Page 11
Oliver Jäkel
Medical Physics
Additional problem: Range uncertainty
Small uncertainties in density may result in larger
dose uncertainties as compared to MV photons
Page 12
Oliver Jäkel
Medical Physics
Beam stops at distal edge Beam overshoot
Courtesy of S.
Mori, G. Chen,
MGH, Boston
Initial Planning CT
GTV 115 cc
5 weeks later
GTV 39 cc
Lung Tumor shrinkage during p-therapy
Need for replanning and adaption during course of RT