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Image guidance
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Patients position less well than we think
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IGRT allows more accurate delivery of dose
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Deliver the dose to where you planned
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? Reduce PTV margins (don’t over-reduce)
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Reduces
total patient dose (integral dose)
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Delivers dose more precisely to target and normal tissue
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Especially important with steep dose gradients
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Skin set-up
Bone
Seeds
3D Displacement (mm)
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Prostate
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Skin set up
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Pelvic bone EPID
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Seed IGRT
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(Dr Yvonne Rimmer)