Intensity modulated radiation therapy reverse optimization method and device

An intensity-modulated radiotherapy and reverse optimization technology, applied in radiotherapy, treatment and other directions, can solve the problems of major impact on plan quality, long time, and failure to meet the doctor's required treatment plan, so as to avoid poor quality of treatment plan and algorithm. The effect of fast convergence and reduced user workload

Active Publication Date: 2015-11-11
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the intensity-modulated radiotherapy plan, users usually rely on experience to select the direction of the radiation field. The selection of the radiation field direction has a great impact on the quality of the final plan. If the user is not experienced enough, it may lead to a treatment plan that does not meet the doctor's requirements after optimization.
At this time, if the field direction is adjusted again, the entire optimization process needs to be repeated, which will take a lot of time

Method used

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  • Intensity modulated radiation therapy reverse optimization method and device
  • Intensity modulated radiation therapy reverse optimization method and device
  • Intensity modulated radiation therapy reverse optimization method and device

Examples

Experimental program
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Embodiment 1

[0034] figure 1 It is a flow chart of the reverse optimization method for intensity-modulated radiotherapy according to the first embodiment of the present invention. refer to figure 1 As shown, the method of the present embodiment includes the following steps:

[0035] In step 101, a plurality of initial candidate fields are obtained.

[0036] The alternative radiation field is determined by its irradiation direction, which can be defined by the angle within the range of 360 degrees of the gantry angle. In one example, a plurality of control points can be selected as the angles of the alternative shooting fields within the range of 360 degrees of the frame angle, which is called the alternative angle, and the number N (positive integer) of the control points corresponds to the number of the alternative shooting fields. number, which can be preset by the method. The selection of multiple control points is, for example, uniformly selected within 360 degrees, or partial angl...

Embodiment 2

[0067] figure 2 It is a flow chart of the reverse optimization method for intensity-modulated radiotherapy according to the second embodiment of the present invention. refer to figure 2 As shown, the method includes the following steps:

[0068] In step 201, a plurality of initial candidate fields are obtained.

[0069] The alternative radiation field is determined by its irradiation direction, which can be defined by the angle within the range of 360 degrees of the gantry angle. In one example, a plurality of control points can be selected as the angles of the alternative shooting fields within the range of 360 degrees of the frame angle, which is called the alternative angle, and the number N (positive integer) of the control points corresponds to the number of the alternative shooting fields. number, which can be preset by the method. The selection of multiple control points is, for example, uniformly selected within 360 degrees, or partial angles are selected accordi...

Embodiment 3

[0104] image 3 It is a flow chart of the reverse optimization method for intensity-modulated radiotherapy according to the third embodiment of the present invention. refer to image 3 As shown, the method includes the following steps:

[0105] In step 301, the settings of the minimum number of irradiation hops MUmin for each subfield, the minimum subfield area SEGmin, and the maximum number of subfields for each subfield are accepted. The purpose of setting these three parameters is to avoid inefficient subfields and prolong the treatment time.

[0106] In step 302, a plurality of initial candidate fields are obtained.

[0107] The alternative radiation field is determined by its irradiation direction, which can be defined by the angle within the range of 360 degrees of the gantry angle. In one example, a plurality of control points can be selected as the angles of the alternative shooting fields within the range of 360 degrees of the frame angle, which is called the alte...

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Abstract

The invention provides an intensity modulated radiation therapy reverse optimization method and device. The method comprises the following steps that multiple initial candidate radiation fields are acquired; unit irradiation hop dose contribution of each sub-radiation beam to organ body elements in all the candidate radiation fields is calculated; one of multiple reference radiation fields enabling plan quality of intensity modulated radiation therapy to be enhanced at the maximum level in the multiple candidate radiation fields according to dose distribution of the candidate radiation fields and corresponding subfield shapes are solved; the number of irradiation hops required for the subfield shapes corresponding to all the reference radiation fields is solved; all the subfields included by all the reference radiation fields are optimized; and a subfield optimization result meeting the set requirements is outputted.

Description

technical field [0001] The present invention mainly relates to radiotherapy equipment, in particular to a reverse optimization method and device for intensity-modulated radiotherapy. Background technique [0002] Radiation therapy is the treatment of malignant tumors and some benign diseases by using one or more ionizing radiations. [0003] Intensity modulated radiation therapy (IMRT) is a kind of radiation therapy, developed from three-dimensional conformal radiation therapy. Intensity-modulated radiotherapy requires that the beam intensity in the radiation field (hereinafter referred to as the radiation field) be adjusted according to certain requirements. Intensity-modulated radiotherapy is to adjust the beam intensity according to the three-dimensional shape of the target area and the specific anatomical relationship between the vital organs and the target area under the condition that the shape of each radiation field is consistent with the target area. The beam inten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/00
Inventor 周婧劼冯源张鹏
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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