X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1994-02-02
1996-06-18
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 69, A61N 510
Patent
active
055286500
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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Holmes Timothy
Mackie Thomas R.
Swerdloff Stuart
Bruce David Vernon
Porta David P.
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