1982-1983 / 3581
Can there be a good external surrogate for
the position of a lung/liver tumour?
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No surrogate is good enough
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Solution 1: use large margins ( approx equal to free breathing)
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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