System and method for calculating scatter radiation

G - Physics – 01 – J

Patent

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Details

G01J 3/44 (2006.01) A61N 5/00 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2287586

The present invention relates to a fast and accurate method for calculating fluence of a calculation plane (210) over a patient. According to an embodiment of the present invention, only a subset (560, 562) of the collimator leaves (104) are analyzed for the fluence calculation, thus reducing the number of calculations required. Additionally, pre-integrated values of scatter strips (520), associated with each point of the calculation plane (210), may be referenced in a lookup table (1010). The use of these pre-integrated values allows the avoidance of adding the fluence contribution of each square on the scattering plane (202). Rather, pre- calculated values of a subset (560, 562) of the scattering plane (202) (scatter strip (520)) may be referenced and combined, thus reducing the number of calculations required for a final scatter contribution to a point (500, 500a, 500b, 500c) on the calculation plane (210). Further, the thickness of the collimator leaves (104) is considered in the fluence calculation, thus providing a more accurate model for the scatter contributions of points on the scattering plane (202).

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