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Method for establishing measurement data-based simple and convenient irradiation source model of medical linear accelerator

A linear accelerator and data measurement technology, applied in X-ray/γ-ray/particle irradiation therapy, special data processing applications, electrical digital data processing, etc., can solve problems such as non-uniform accelerator intensity

Inactive Publication Date: 2013-02-13
HEFEI UNIV OF TECH
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Problems solved by technology

However, due to the differences in the production and installation of each accelerator, there is often a certain degree of non-uniformity in the intensity of the opening field of the accelerator.

Method used

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  • Method for establishing measurement data-based simple and convenient irradiation source model of medical linear accelerator
  • Method for establishing measurement data-based simple and convenient irradiation source model of medical linear accelerator
  • Method for establishing measurement data-based simple and convenient irradiation source model of medical linear accelerator

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Embodiment

[0090] Taking a Varian 2300 C / D 6MeV 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. Measure the PDD of 2cm×2cm, 10cm×10cm, 35cm×35cm field and the OAR data of 1.5cm, 5cm, 10cm, 20cm and 30cm depth respectively, and all the dose data are normalized to d along the central axis of the irradiation field max Dose of depth. Invert the OAR data at a depth of 10cm to the lower surface of the MLC according to step 2 (assuming it is perpendicular to the central axis of the irradiation field and 46cm away from the upper surface of the water model, that is, the distance between the virtual point source of the accelerator irradiation and the lower surface of the MLC is SSD-46 =44cm). The following formula is the fitted flux map Boltzmann function fitting formula,

[0091] ...

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Abstract

The invention discloses a method for establishing a measurement data-based simple and convenient irradiation source model of a medical linear accelerator. The method is characterized by comprising the following steps of: supposing that an irradiation source of the medical linear accelerator is on the part of the bottommost end of an MLC (Multi-leaf Collimator); measuring a flux pattern of data inversion from the accelerator through adjustment; and realizing simulation of the irradiation source of the medical linear accelerator by using a method of combining weight of outgoing particles and flux strength by combining the position of the outgaining particles with the flux distribution. Dose distribution in a template is obtained by using geometric description of a particle transport model of classic monte carlo program EGSnrc and a model of DOSXYZnrc. The method is established based on measurement data of the medical linear accelerator, so that the dependence of the conventional full accelerator simulation on the technical detail of the structure of the accelerator and heavy calculation task brought by need of sectional re-simulation in each modification process of the simulation parameter are avoided. The model can be used as an irradiation source model for an accurate monte carlo dosage calculation tool in a human body and can also be used for providing a source model for a dosage verification tool in a treatment planning system and an analytical dosage calculation tool of a treatment scheme optimization algorithm.

Description

technical field [0001] The invention relates to a method for establishing a simple radiation source model of a medical linear accelerator based on measurement data, and the model can be used for accurately simulating the dose distribution in a human body in tumor external radiation therapy. Background technique [0002] Medical linear accelerators are important equipment for external radiation therapy of tumors. At present, the linear accelerators used in hospitals above the provincial level in my country are basically expensive foreign brands (such as Siemens, Medical University, Varian, etc.), and other The Tumor Radiation Therapy Planning System (TPS, Treatment Planning System) sold in bundles, and these products are often in continuous updating, causing a heavy economic burden on hospitals and patients. Accurate simulation of medical linear accelerator radiation sources is related to the accuracy of dose calculation in TPS. [0003] The traditional accelerator models in ...

Claims

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Application Information

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IPC IPC(8): A61N5/10G06F17/50
Inventor 林辉许良凤蔡金凤景佳裴曦曹瑞芬
Owner HEFEI UNIV OF TECH
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