Fig. 1
From: Clinical utility of Gafchromic film in an MRI-guided linear accelerator
A sample calibration film irradiated with a nine dose-level pattern (a) and the corresponding planar isodose distribution from the treatment planning system (b) are each registered to a binary matrix (c). The average optical density from the film and corresponding dose from the planar dose file, at each block of the registered binary matrix is used to generate the calibration curve