Radiotherapy
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United States of America Patent
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app pub date -
Oct 9, 2012
filing date -
Apr 28, 2011
priority date (Note) -
Abandoned
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Abstract
Radiotherapy apparatus is disclosed, comprising a radiation source capable of emitting a beam of therapeutic radiation along a beam axis, collimation apparatus for delimiting the beam and comprising (i) a block of sufficient width to extend across the width of the beam, selectively movable into the beam from a first side of the beam axis, and (ii) an array of individually moveable elongate narrow leaves arranged side-by-side in a direction perpendicular to the beam, each being moveable longitudinally into the beam from a second and opposing side of the beam axis, in which there is no array of individually moveable elongate narrow leaves arranged side-by-side in a direction perpendicular to the beam moveable longitudinally into the beam from the first side of the beam axis. Thus, there is in effect a single bank of MLC leaves on one side of the aperture and a block collimator on the other.
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