A Method to Increase the Dose Rate of Medical Linear Electron Accelerators by Considering the Target and the Flattening Filter as a Whole System When Designing the Target

KONG Xiao-Xiao; ZHAO Hong-Bin; LI Quan-Feng; LIN Xiao-Qi

Chinese Physics C> 2005, Vol. 29> Issue(9) : 903-906

A Method to Increase the Dose Rate of Medical Linear Electron Accelerators by Considering the Target and the Flattening Filter as a Whole System When Designing the Target

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Peking University, Beijing 100871, China3 Beijing Medical Equipment Institute, Beijing 100011, China

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Abstract：
Generally, the design of the target used in the medical electron accelerator follows the thick-target rule, that is, using a target thicker than the electron range to make almost no electrons penetrating out of the target. In this article, a new rule of target design is proposed. The target and the relevant components (primary collimator and flattening filter) are considered as a whole system when designing the target, that is, using a thinner target to increase the dose rate and using the primary collimator and the flattening filter to reduce the contaminated electrons. To improve the dose rate in the treatment, an optimization is given to the target design of BJ-6, a 6MV medical linear electron accelerator, by using Monte Carlo method. By using MC codes of MCNP and BEAMnrc, simulations are given to calculate the percent depth dose profiles in the 10cm×10cm field and the 30cm×30cm field respectively. The surface dose satisfies the national standards and the dose rate in treatment increases 10 percent of that of the present thick-target. The feasibility of this method has been tested by experiment.

References

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. Teterev U G, Belov A G. Induced Activity of a Tungsten Target in a 10MeV Electron Accelerator. Atomic Energy,2001, 91(3): 745-7482. Karzmark C J et al. Medical Electron Accelerators. McGraw-Hill, 19933. MCNP4C, CCC-700. New Mexico: Los Alamos National Laboratory, 19974. Rogers D W O, Faddegon B A, DING G X et al. BEAM:A Monte Carlo Code to Simulate Radiotherapy Treatment Units. Med. Phys., 1995, 22: 503-5245. Walters B R B, Rogers DWO. DOSXYZnrc Users Manual:NRCC Report PIRS-794. 20026. GBZ126-2002, Radiological Protection Standard for Using of Medical Electron Accelerator(in Chinses)(GBZ126-2002,医用电子加速器卫生防护标准)

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KONG Xiao-Xiao, ZHAO Hong-Bin, LI Quan-Feng and LIN Xiao-Qi. A Method to Increase the Dose Rate of Medical Linear Electron Accelerators by Considering the Target and the Flattening Filter as a Whole System When Designing the Target[J]. Chinese Physics C, 2005, 29(9): 903-906.

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Received: 2004-12-03
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

A Method to Increase the Dose Rate of Medical Linear Electron Accelerators by Considering the Target and the Flattening Filter as a Whole System When Designing the Target

Corresponding author: KONG Xiao-Xiao,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Peking University, Beijing 100871, China3 Beijing Medical Equipment Institute, Beijing 100011, China

Received Date: 2004-12-03

Accepted Date: 1900-01-01

Available Online: 2005-09-05

Abstract: Generally, the design of the target used in the medical electron accelerator follows the thick-target rule, that is, using a target thicker than the electron range to make almost no electrons penetrating out of the target. In this article, a new rule of target design is proposed. The target and the relevant components (primary collimator and flattening filter) are considered as a whole system when designing the target, that is, using a thinner target to increase the dose rate and using the primary collimator and the flattening filter to reduce the contaminated electrons. To improve the dose rate in the treatment, an optimization is given to the target design of BJ-6, a 6MV medical linear electron accelerator, by using Monte Carlo method. By using MC codes of MCNP and BEAMnrc, simulations are given to calculate the percent depth dose profiles in the 10cm×10cm field and the 30cm×30cm field respectively. The surface dose satisfies the national standards and the dose rate in treatment increases 10 percent of that of the present thick-target. The feasibility of this method has been tested by experiment.

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A Method to Increase the Dose Rate of Medical Linear Electron Accelerators by Considering the Target and the Flattening Filter as a Whole System When Designing the Target

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