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Radiotherapy dose measurement system based on fluorescent film and optical fiber probe

A fiber optic probe and radiotherapy technology, applied in the field of medical systems, can solve problems such as complex processing procedures, inability to achieve charged ion balance, and susceptibility to environmental conditions, and achieve the effect of reducing manufacturing costs

Inactive Publication Date: 2018-12-28
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these monitoring devices have certain shortcomings and limitations in practical applications.
Due to its good dosimetric response characteristics, the ionization chamber has long been used as a reference dosimeter for absolute metrology verification, but it has three disadvantages: (1) It needs to apply high voltage; (2) The spatial resolution is low; (3) When performing small field dose measurement It may not be possible to achieve the balance of charged ions, which will cause large measurement errors and need to be corrected accordingly.
Film has high spatial resolution and high positioning accuracy, but it is expensive, complicated to process, and easily affected by environmental conditions
The measurement accuracy of EPID can reach 0.1mm, which can be used for real-time and off-line verification of dose, but its equipment and software are relatively expensive, and absolute dose measurement cannot be performed

Method used

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  • Radiotherapy dose measurement system based on fluorescent film and optical fiber probe
  • Radiotherapy dose measurement system based on fluorescent film and optical fiber probe
  • Radiotherapy dose measurement system based on fluorescent film and optical fiber probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Used for accelerator field size verification and multi-leaf grating (Multi-leaf collimator, MLC) positioning accuracy verification, the specific implementation steps are as follows:

[0025] (1) Place the dosimeter 2 horizontally on the treatment bed 6, turn off the lighting in the treatment room, and turn on the laser positioning system, so that the laser lines in the front, back, left and right, and up and down directions are aligned with the laser positioning line 12 on the dosimeter 2, Fine-tuning is carried out through the horizontal adjustment nut 22, so that the laser line and the laser positioning line are completely coincident, and all lights of the laser positioning system and the treatment room are turned off;

[0026] (2) CCD camera 3 is connected on the computer 10, and open corresponding data acquisition software;

[0027] (3) Turn the MLC to the maximum field, set different field sizes in the accelerator 1, each field size is 100 MU, open th...

Embodiment 2

[0030] Embodiment 2: Daily morning inspection of accelerator 1, the specific implementation steps are as follows:

[0031] (1) is identical with step (1) among the example 1;

[0032] (2) The dosimeter 2 is connected to the computer through the optical fiber 7, the light intensity receiver 8 and the data line 9;

[0033] (3) Set different ray energies and types on the accelerator 1, as well as the corresponding measurement conditions and output the beam, and open the data acquisition software to obtain the signal of each fiber probe;

[0034] (4) Through software analysis and processing, the absolute measurement, field flatness and symmetry of different rays can be obtained, as well as the corresponding error information.

Embodiment 3

[0035] Embodiment 3: patient dose verification, the specific real-time steps are as follows:

[0036] (1) Create a virtual phantom on the radiotherapy planning system according to the size and material data of the dosimeter 2, and transplant each radiation field of the patient and its parameters to the dosimeter virtual phantom, and calculate each radiation field separately The dose distribution of the generated verification plan;

[0037] (2) Transmit the verification plan of each patient to the accelerator control platform through the data management system;

[0038] (3) same as embodiment 1 step (1);

[0039] (4) same as embodiment 1 and embodiment 2 step (2);

[0040](5) Execute the patient verification plan, and simultaneously use the dosimeter 2 and the CCD camera 3 to acquire data;

[0041] (6) The relative intensity distribution of the two-dimensional dose on the fluorescent film can be obtained by the CCD camera 3, the absolute point dose of the corresponding point...

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Abstract

The invention discloses a radiotherapy dose measurement system based on a fluorescent film and an optical fiber probe, comprising a dosimeter, a CCD(Charge Coupled Device) camera, a light intensity receiver, and a computer. The dosimeter is horizontally placed on the treatment couch and located underneath the head of an accelerator; the CCD camera is located above the dosimeter; the dosimeter is connected with the light intensity receiver through an optical fiber; the light intensity receiver is connected with the computer through a data cable; the computer is connected with the CCD camera through a data cable. According to the radiotherapy dose measurement system based on the fluorescent film and the optical fiber probe, the system has a high spatial resolution and a high cost performancewhile the accuracy of a dose measurement is guaranteed; the present invention has a plurality of applications such as verifications of radiation field size and multi-leaf collimator(MLC) moving accuracy, and dose verifications of accelerator daily morning analyzer and patient treatment plan.

Description

technical field [0001] The invention belongs to the technical field of medical systems, and relates to a radiotherapy dose measurement system, in particular to a radiotherapy dose measurement system based on a radioluminescent fluorescent film and an optical fiber probe, which can be used for accelerator quality control and patient dose verification of radiotherapy . technical background [0002] Radiation therapy is one of the three major means of cancer treatment. With the continuous advancement of radiation physics and computer application technology in medical work, modern radiation therapy technology is becoming more and more sophisticated and complex. Strict quality assurance (quality assurance, QA) and quality control (quality control, QC) procedures are necessary conditions to achieve the desired therapeutic effect. The definition of QA by the International Standard Organization is: all the plans formulated to meet certain quality requirements, and the necessary mea...

Claims

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Application Information

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IPC IPC(8): G01T1/02G01T1/10G01T1/08
CPCG01T1/02G01T1/08G01T1/10
Inventor 代智涛涂东于亚军李妩舟
Owner WUHAN UNIV
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