926-927 / 3107
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.