Method and apparatus for radiation therapy
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United States of America Patent
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Jun 18, 1996
Issued Date -
N/A
app pub date -
Feb 2, 1994
filing date -
Mar 19, 1992
priority date (Note) -
Expired
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Abstract
A radiation therapy apparatus includes a compensator having a plurality of leaves to divide the radiation beam into rays each of which may be effectively and individually attenuated over a range of attenuations by controlling the duty cycle of the leaves position between the open and closed states. An apparatus for controlling the compensator accounts for scattering of radiation through the deconvolution of a terma map and calculates a sinogram for controlling the compensator at a variety of angles about a patient using iterated forward and back projections efficiently calculated in frequency space.
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