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. Author manuscript; available in PMC: 2008 Aug 11.
Published in final edited form as: Med Phys. 2008 Jan;35(1):101–111. doi: 10.1118/1.2804616

FIG. 4.

FIG. 4

Projection images and corrections. Raw projection images (A, D, G, and J), flood field corrected projection images (B, E, H, and K), and line profiles (C, F, I, and L) along dotted lines in raw and flood field corrected images from the CCD scanner for the unirradiated PRESAGE™ insert (top panel), single rectangular beam treatment (second panel), parallel-opposed treatment (third panel) and IMRT treatment (bottom panel). Background inhomogeneities and light attenuating static impurity specs were eliminated by flood field correction of raw images.