Rotating intensity-modulated partition method and device of orthogonal double-layer grating
An intensity modulation and grating technology, which is applied in the medical field, can solve the problem that the rotary intensity modulation is difficult to further improve the treatment efficiency, and achieve the effect of improving the treatment efficiency and satisfying the treatment effect
Inactive Publication Date: 2019-11-05
SUZHOU LINATECH INTELLIGENT SCI & TECH CO LTD
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[0005] The object of the present invention is to provide a rotating intensity modulation segmentation method and device for orthogonal double-layer gratings to solve the problem that the rotating intensity modulation is difficult to further improve the treatment efficiency.
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[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0071] In the existing sub-field segmentation technology, whether it is a single-layer grating or a parallel double-layer grating, there are two problems: the conformity in the thickness direction of the leaf is not enough; a complex field requires multiple sub-fields to form , low irradiation efficiency. Orthogonal double-layer gratings have advantages in conformity and irradiation efficiency. In addition, double-layer gratings can effectively reduce grating leaka...
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The invention provides a rotating intensity-modulated partition method and device of an orthogonal double-layer grating, and relates to the technical field of medical treatment. The partition method comprises the steps that a rotating arc is discretized into a plurality of radiation fields with equal interval according to the radiotherapy prescription and target area characteristics; an intensitymap corresponding to each radiation field is calculated by using a conjugate gradient method; for the each radiation field, the intensity map is partitioned in an intensity-modulated mode by the orthogonal double-layer grating according to a velocity synthesis method, intensity-modulated sub-field shapes are obtained, the obtained intensity-modulated sub-field shapes for the multiple radiation fields are concatenated, and thus rotating intensity-modulated partition sub-fields are obtained. Firstly, the rotating arc is discretized into fixed fields with the equal interval, the dynamic partitionof the orthogonal double-layer grating is conducted on the basis, and finally, all the sub-fields are concatenated, the obtained rotating intensity-modulated partition combines the advantages of bothrotating intensity modulation and the orthogonal double-layer grating, the treatment effect is met, and the treatment efficiency is also improved.
Description
technical field [0001] The invention relates to the field of medical technology, in particular to a method and device for rotating intensity modulation segmentation of orthogonal double-layer gratings. Background technique [0002] Intensity modulation technology is a technology that adjusts the intensity of the incident beam to non-uniformly irradiate the target area. The beam superposition of different incident directions finally obtains an ideal dose distribution. Intensity modulated technology can largely concentrate the dose on the target area and reduce the exposure to organs at risk. [0003] At present, the more common technique for realizing intensity modulation in radiotherapy is to apply gratings for intensity modulation. In general, the thinner and more leaves of a multi-leaf collimator, the better its conformability. The capacity is limited. For the parallel double-layer grating, although the conformability of the blade thickness direction is improved compare...
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IPC IPC(8): A61N5/10
CPCA61N5/1031A61N5/1042A61N5/1045
Inventor 文虎儿关睿雪姚毅
Owner SUZHOU LINATECH INTELLIGENT SCI & TECH CO LTD