A Calculation and Verification Method of Rapid Afterloading Radiotherapy Dose

A verification method and dose technology, which is applied in radiation therapy, X-ray/γ-ray/particle irradiation therapy, treatment, etc., can solve the problems of heavy clinical tasks of physicists, no after-installation radiation therapy dose verification method, and difficult implementation

Active Publication Date: 2021-05-11
SICHUAN CANCER HOSPITAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After foreign physicists or dosimetrists complete the treatment plan design through the Treatment Planning System (TPS) (the treatment planning system is the existing software used by physicists or dosimetrists to design radiation therapy plans for patients), there are usually additional An experienced physicist conducts dose verification of the treatment plan, but physicists in my country have heavy clinical tasks, and it is difficult to rely on another physicist to verify the dose of the treatment plan
As early as 2004, the European Radiation Therapy Association recommended that each afterloading radiotherapy center should have a dose verification method independent of the treatment planning system, but there is no research on the dose verification method of afterloading radiotherapy in my country.

Method used

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  • A Calculation and Verification Method of Rapid Afterloading Radiotherapy Dose
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  • A Calculation and Verification Method of Rapid Afterloading Radiotherapy Dose

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Embodiment 1

[0057] Such as figure 1 As shown, a method for calculating and verifying the dose of fast afterloading radiotherapy includes the following steps:

[0058] a. Export the DICOM file corresponding to the patient from the treatment planning system and save it in a fixed folder;

[0059] b. Scan the fixed folder and read the required dose calculation information from the DICOM file;

[0060] c. Obtain radioactive source parameters and establish a dose rate distribution table;

[0061] d. Determine the direction of the radiation source, perform dose calculation according to the dose calculation information, and obtain the dose calculation result;

[0062] e. Compare the obtained dose calculation result with the dose result in the treatment planning system to obtain the deviation value Dev and γ verification results;

[0063] f. After the comparison is completed, the deviation value Dev and γ verification results are saved to a fixed folder, and the DICOM files in the fixed folder...

Embodiment 2

[0066] In this embodiment, on the basis of Embodiment 1, in the step c, the radioactive source parameters are acquired according to the data recommended by AAPM and ESTRO. In order to ensure the independence of the dose calculation of the software, the radiation source parameters are not obtained from the radiotherapy planning system, but the data recommended by AAPM (American Association of Physicists in Medicine) and ESTRO (European Society for Radiotherapy and Oncology) are used.

Embodiment 3

[0068] In this embodiment, on the basis of Embodiment 2, establishing a dose rate distribution table in the step c includes the following steps:

[0069] Calculate the dose rate at a certain dose calculation point in, is the dose rate at the dose calculation point, r is the distance from the dose calculation point to the center of the radioactive source, r 0 =1cm, θ is the angle between the dose calculation point and the long axis V direction of the radioactive source in the polar coordinate system, θ 0 = π / 2, S k is the air kerma intensity, Λ is the dose rate constant, G is the geometry factor, g is the radial dose function, and F is the anisotropy function;

[0070] According to the symmetry of the dose distribution around the radioactive source, calculate the two-dimensional dose rate distribution table T(m, n) along the long axis V direction of the radioactive source and perpendicular to the long axis U direction of the radioactive source, and store it in the computer...

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Abstract

The invention discloses a method for calculating and verifying the dose of post-loading radiotherapy rapidly. The DICOM file corresponding to the patient is exported from the treatment planning system and saved in a fixed folder; the fixed folder is scanned to read the DICOM file from the DICOM file. The required dose calculation information; obtain the radiation source parameters, establish the dose rate distribution table, determine the direction of the radiation source, and perform dose calculation; compare the calculated dose results with the dose results in the treatment planning system to obtain the deviation values ​​Dev and γ Verification results; after the comparison is completed, the deviation value Dev and γ verification results are saved to a fixed folder, and the DICOM files in the fixed folder are automatically deleted. The invention can perform dose verification before treatment, which is simple and fast, and improves accuracy and efficiency. The whole verification process only takes a few minutes, does not require too much human-computer interaction, and can be used in various after-installed radiotherapy planning systems. It improves the quality control and assurance of afterloading radiation therapy and is suitable for promotion.

Description

technical field [0001] The invention relates to the technical field of backloading radiation therapy, in particular to a method for calculating and verifying fast afterloading radiation therapy doses. Background technique [0002] Backloading radiation therapy is an effective method of cancer treatment, evaluating the accuracy of dose calculation is crucial to ensure accurate afterloading radiation therapy; the process of radiation therapy is to dose the treatment plan after the treatment plan is approved and before the implementation begins verify. [0003] After foreign physicists or dosimetrists complete the treatment plan design through the Treatment Planning System (TPS) (the treatment planning system is the existing software used by physicists or dosimetrists to design radiation therapy plans for patients), there are usually additional An experienced physicist performs dose verification of the treatment plan, but physicists in my country have heavy clinical tasks, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N5/10
CPCA61N5/1031A61N5/1048
Inventor 王先良王培侯氢黎杰康盛伟李厨荣
Owner SICHUAN CANCER HOSPITAL
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