Journal of Radiation Research and Radiation Proces ›› 2016, Vol. 34 ›› Issue (2): 20202-020202.doi: 10.11889/j.1000-3436.2016.rrj.34.020202

• RADIOBIOLOGY AND RADIOMEDICINE • Previous Articles     Next Articles

Effects of secondary interlocking on the dose verification of head tumor in the treatment of volumetric modulated arc therapy

MENG Huipeng1,2, DONG Huajiang1,3, SUN Xiaozhe2, ZHENG Aiqing2, LIANG Keming2   

  1. 1. School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China;
    2. Radiotherapy Center, the Affiliated Hospital of Logistics University of Chinese People's Armed Police Force, Tianjin 300162, China;
    3. Department of Anthropotomy and Histoembryology, Logistics University of Chinese People's Armed Police Force, Tianjin 300309, China
  • Received:2015-10-22 Revised:2015-12-14 Online:2016-04-20 Published:2016-01-18
  • About author:MENG Huipeng, male, was born in October 1981; graduated with master degree from Nankai University in 2011; now is a doctoral candidate of Tianjin University, majoring in radiotherapy physics for tumor and network-related research; physicist and senior engineer.
  • Supported by:

    Supported by Project of Scientific Research Innovation Team of Logistics University of CAPF (No. WHTD201308-2)

Abstract:

The data of dose verification for head tumor in the treatment of volumetric modulated arc therapy (VMAT) was compared to analyze whether or not the statistics difference of gamma passing rates exists when the secondary interlocking occurs. The verification planned for head tumor of 50 patients were used for testing and verifying with the chamber array detector from PTW(PTW Detector 729). Five comparative experiments were performed for each pair of the three standards. The gamma passing rate of 1%/1 mm, 2%/2 mm, 3%/3 mm and T-test were used in the quantitative analysis. Statistical differences were found for all measurements of the three standards paired groups (t value range: 12.647~62.911, p<0.001). The comparative analysis showed that the gamma passing rates was affected significantly when the secondary interlocking occurred. It is suggested that the treatment should be stopped until troubleshooting when the secondary interlocking occurred frequently in the radiotherapy.

Key words: Secondary interlocking, Head tumor, Volumetric modulated arc therapy(VMAT), Pass rate

CLC Number: 

  • TL72