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Patients position less well than we think
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IGRT allows more accurate delivery of dose
Deliver the dose to where you planned
? Reduce PTV margins (don’t over-reduce)
If no reduction of margin, delivers dose more precisely to
target and (probably) normal tissue
Especially important with steep dose gradients
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Skin set-up
Bone
Seeds
3D Displacement (mm)
Prostate
Skin set up
Pelvic bone EPID
Seed IGRT
(Dr Yvonne Rimmer)