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2D detectors [EPID]

EPID

primary

fluence

dose

calculation

algorithm

3. Predict primary fluence from transit images

Measure transit EPID dose

Convert to dose at EPID level

Deconvolve EPID dose with lateral scatter kernel and

back-project through patient/phantom to estimate primary

fluence

Use primary fluence as input to calculate dose distribution

in patient/phantom

Hansen

Med Phys (23) 1996

Kapatoes

Med Phys (28) 2001

Partridge

Med Phys (29) 2002