X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1998-10-23
2000-08-01
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 62, 378 69, G21K 500
Patent
active
060977876
ABSTRACT:
The present invention relates to a fast and accurate method for calculating fluence of a calculation plane over a patient. According to an embodiment of the present invention, only a subset of the collimator leaves are analyzed for the fluence calculation, thus reducing the number of calculations required. Additionally, pre-integrated values of scatter strips, associated with each point of the calculation plane, may be referenced in a lookup table. The use of these pre-integrated values allows the avoidance of adding the fluence contribution of each square on the scattering plane. Rather, pre-calculated values of a subset of the scattering plane (scatter strip) may be referenced and combined, thus reducing the number of calculations required for a final scatter contribution to a point on the calculation plane. Further, the thickness of the collimator leaves is considered in the fluence calculation, thus providing a more accurate model for the scatter contributions of points on the scattering plane.
REFERENCES:
patent: 3871360 (1975-03-01), Van Horn et al.
patent: 5317616 (1994-05-01), Swerdloff et al.
patent: 5764723 (1998-06-01), Weinberger et al.
Bruce David V.
Siemens Medical Systems Inc.
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