Method for determining radiating field output dose accurately in conformalradiotherapy

A radiation field, precise technology, applied in radiation therapy, phototherapy, X-ray/γ-ray/particle irradiation therapy, etc. Correct and reliable results

Inactive Publication Date: 2007-08-08
成都奇林科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be pointed out that in actual radiotherapy planning, especially conformal planning, the shape of the radiation field is often irregular, and most of them are eccentric fields, and it is difficult to obtain the percentage depth dose PDD under these radiation fields; Uniformity and body surface curvature are different, and have a relatively large impact on dose. It is very difficult to obtain accurate output dose jumps of the radiation field by the above method
Since the above method is too regular and lacks general applicability, it must be improved

Method used

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  • Method for determining radiating field output dose accurately in conformalradiotherapy
  • Method for determining radiating field output dose accurately in conformalradiotherapy
  • Method for determining radiating field output dose accurately in conformalradiotherapy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] This example uses an accelerator: Varian 23ex, the photon beam energy is 6MV, and the specific implementation method is as follows:

[0052] (1) Made of plexiglass plate into 25×25×25cm 3 The phantom is placed in the middle of the phantom with a measurement probe ionization chamber simulation rod. The top of the simulation rod is a hollow sphere, which is used to place the dosimeter ionization chamber probe. The midpoint of the probe is 10 cm from the surface of the phantom, as shown in Figure 3.

[0053] (2) Perform a CT scan on the fabricated plexiglass phantom, then input the CT tomography into the computer, and set the radiation field parameters, including: the number of beams, the angle of the gantry, the angle of the handpiece, the angle of the bed, the size of the radiation field, the distance from the source to the skin, the prescription Dose, etc., follow steps a to e in the above-mentioned specific implementation method, and finally determine the output hop nu...

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Abstract

The invention relates to a method for accurately fixing the radiation output amount in radiotheraphy, which comprises that setting coordinate on patient, to obtain the information of ill part; setting the radiation coordinate at the injection direction of accelerator, building the projection between the human coordinate and the injection coordination; calculating out the agent distribution generated in the injection grid matrix of injection coordinate; building the formula of output MU; building the body model, processing radiation analogue calculation on the body model, radiating with machine, detecting the radiation amount via the detector in the body model, checking the error between the analogue calculated agent and the detected agent, to reach the demand. The invention builds accurate algorism (A) to be used in variable radiation systems with high accuracy.

Description

technical field [0001] The invention relates to a clinical radiotherapy technology, specifically, how to accurately determine the output of the accelerator or the cobalt generator through the radiotherapy planning system of the equipment when a medical accelerator photon beam or a cobalt generator gamma beam is used to irradiate a tumor patient. A method for the required therapeutic dose to the tumor ward. Background technique [0002] Before a hospital uses a medical accelerator photon beam or a cobalt gamma beam to irradiate a tumor patient, the radiation therapy planning system (TPS) must be used to make a radiation therapy plan for the patient, and then the patient will be irradiated according to the plan. When implementing radiation therapy, it is necessary to give the output dose hop count MU (Monitor Unit, 1MU=1CGY) or radiation time of each beam radiation field of the accelerator or cobalt machine, and then the operator will perform radiation therapy on the patient a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/00A61N5/06A61N5/10A61B19/00G06F19/00A61B18/18
Inventor 杨代伦吴章文勾成俊罗正明
Owner 成都奇林科技有限责任公司
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