Physics Bucharest 2017

3-D / 4-D IGRT

• Preferred for tumours close to organs at risk

• Mobile tumours (4 th dimension is time) e.g. lung, lower oesophagus, liver

• Valuable for target volumes prone to changes in size and shape e.g. bladder, prostate, lung

• Essential for soft tissue tumours surrounded by soft tissue e.g. pancreas

• Essential for extra-cranial stereotactic XRT

• May enable reduction in planning margins which may improve treatment outcome and prognosis.