Method for establishing irradiation source model based on irradiation beam characteristics of medical linear accelerators
A linear accelerator and irradiation source technology, applied in X-ray/γ-ray/particle irradiation therapy, instruments, special data processing applications, etc., can solve problems such as time-consuming and labor-intensive extra simulation, errors, etc.
Active Publication Date: 2014-09-17
黄山市开发投资集团有限公司
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[0008] In order to avoid the deficiencies in the prior art, the present invention provides a method for establishing a radiation source model based on the characteristics of the radiation beam of a medical linear accelerator, and establishes the radiation source model of a medical linear accelerator based on the characteristics of the radiation beam of a real accelerator and the measurement data. In order to avoid the dependence of the traditional full accelerator simulation and the traditional accelerator multi-source model on the technical details of the accelerator structure, overcome the time-consuming and labor-intensive full-accelerator simulation and the introduction of the opening module to describe the irregular field by the traditional multi-source model and cause additional simulation errors shortcoming
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[0089] Taking an Elekta Synergy6MV X medical linear accelerator as an example, according to figure 1 Set the measurement conditions, SSD is 90cm, the irradiation isocenter is located at a depth of 10cm along the irradiation central axis below the water surface, and the source-isocenter distance SID is 100cm. The PDD of 2cm×2cm, 5cm×5cm, 10cm×10cm and 20cm×20cm field and the OAR data of 1.5cm, 10cm and 20cm depth were measured respectively. Set the area source of the irradiation field flux intensity map parallel to the upper 45.7 cm of the isocenter, invert the OAR data at a depth of 10 cm to the area source according to step 3, and obtain the irradiation field flux intensity map. The algorithm is implanted into the Monte Carlo program DPM, and the simulated and measured PDD curves are compared according to step 4 to obtain the photon energy spectrum (see Figure 4(a)). Compare the simulated and measured PDD curves according to step 5 to obtain the share of polluted electrons: ...
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The invention discloses a method for establishing an irradiation source model based on irradiation beam characteristics of medical linear accelerators. The method is characterized in that the dosage of the medical linear accelerator to be modeled in a standard water model is measured to obtain dosage measurement data in a typical rule view first; a Monte Carlo model of the known medical linear accelerator is established based on parameters of the known medical linear accelerator; a photon energy spectrum of the medical linear accelerator to be modeled, a contamination electron spectrum of the known medical linear accelerator and the synthesis proportion of a photon source and a contamination electron source of the medical linear accelerator to be modeled are obtained respectively, the outgoing particle angle distribution law of the medical linear accelerator to be modeled is obtained, and then the irradiation source model of the medical linear accelerator to be modeled is formed. The irradiation source model is established on the basis of the irradiation beam characteristics of the known medical linear accelerator and the measurement data of the medical linear accelerator to be modeled, so that dependency on the internal structure of the medical linear accelerator to be modeled is avoided.
Description
technical field [0001] The invention relates to a method for establishing an irradiation source model based on the characteristics of a medical linear accelerator irradiation beam. The method can be used in tumor external radiation therapy to accurately simulate the deposition dose distribution of a medical linear accelerator irradiation source in a phantom or a patient. Background technique [0002] Medical linear accelerators are important equipment for tumor external radiation therapy. At present, the linear accelerators used in hospitals above the provincial level in my country are basically expensive foreign brands such as Siemens, Varian, etc., as well as tumor radiation therapy bundled with them. The planning system TPS (Treatment Planning System), and these products are constantly being updated, causing a heavy economic burden on hospitals and patients. [0003] Accurate simulation of medical linear accelerator radiation sources is related to the accuracy of dose calc...
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IPC IPC(8): A61N5/10G06F17/50
Inventor 林辉吴东升谢聪景佳裴曦曹瑞芬
Owner 黄山市开发投资集团有限公司
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