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Method and device for estimating dose distribution change, and method and system for direct machine parameter optimizing

A dose distribution and dose technology, applied in the field of dose distribution change estimation, can solve the problems of large amount of calculation, long time consumption, and large memory usage of computing equipment, etc., and achieve the effect of small amount of calculation, accurate dose estimation results, and fast calculation speed

Active Publication Date: 2015-05-20
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

The advantage of this method is that the dose does not need to be recalculated when the blade is adjusted, and the estimation of the dose change is relatively accurate, but the disadvantage is that the dose contribution of each small field needs to be calculated in advance, which requires a large amount of calculation, takes a long time, and consumes a lot of memory in the computing device. Occupy more

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  • Method and device for estimating dose distribution change, and method and system for direct machine parameter optimizing

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[0056] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0057] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0058] First of all, it should be explained that the "leaf" in this article refers to the blade in the multi-leaf collimator (MLC); "length" refers to the distance parallel to the direction of blade movement; The distance in the direction; "Projection" is the shadow projected by the irradiated object on a plane with the ray source as a point light source; "Plane" refers to each plane parallel to the preset isocentral plane.

[0059] refer...

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Abstract

The invention provides a method and a device for estimating dose distribution change, and a method and a system for direct machine parameter optimizing. The estimation method comprises the following steps of determining the initial dose distribution before a blade is moved; in the initial dose distribution, determining the dose change influence range caused by the blade moving; for an interest point in the dose change influence range, according to the initial dose distribution, obtaining the initial dose of the interest point before the blade moving, determining a reference point correlated with the interest point because of the blade moving, and according to the dose of the reference point in the initial dose distribution, obtaining the current dose of the interest point after the blade moving; according to the initial dose and the current dose of the interest point, calculating the dose change of the interest point. The estimation method has the advantages that the estimation accuracy on the dose distribution change is higher, the calculation speed is high, the calculation amount is less, the memory occupation is less, and the like.

Description

technical field [0001] The present invention mainly relates to intensity-modulated radiotherapy technology, and in particular to a method and device for estimating dose distribution changes caused by fine-tuning leaves of a multi-leaf grating, and a direct subfield optimization method and system. Background technique [0002] Direct sub-field optimization is the main method of radiotherapy plan optimization, including two aspects: multi-leaf grating leaf position adjustment and sub-field weight adjustment. Among them, the adjustment of the leaf position of the multi-leaf collimator is based on the change of the dose distribution caused by the fine-tuning of the leaf of the multi-leaf collimator, and the accuracy of the calculation of the change of the dose distribution largely affects the effect of the leaf position adjustment. At the same time, because the dose distribution change needs to be repeatedly calculated during the blade adjustment process, the algorithm speed of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/22A61N5/00
CPCA61N5/00G06F19/3481G06Q10/04
Inventor 周婧劼张鹏
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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