2017_IGRT course book
Can there be a good external surrogate for the position of a lung/liver tumour?
• No surrogate is good enough
• Solution 1: use large margins ( approx equal to free breathing)
• Solution 2: image the tumour position daily with respiration- correlated (4D) IGRT ➢ 4D-CBCT for gated treatment ➢ Breath hold CBCT ➢ 2D + markers in the tumour
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