Quality control test and assessment of helical tomotherapy unit

Zipo ZHAI; Hezheng ZHAI; Yongzhong MA; Junzhe PENG; Zhixin ZHAO

doi:10.11889/j.1000-3436.2016.rrj.34.040201

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Quality control test and assessment of helical tomotherapy unit

RADIOBIOLOGY AND RADIOMEDICINE | 更新时间：2021-12-10

- Quality control test and assessment of helical tomotherapy unit
- Journal of Radiation Research and Radiation Processing Vol. 34, Issue 4, Pages: 23-26(2016)
- 作者机构：
  
  1.湖南省职业病防治院长沙 410007
  2.北京协和医学院 & 中国医学科学院放射医学研究所天津 300192
  3.北京市疾病预防控制中心北京 100013
- 作者简介：
- 基金信息：
  
  Peking Union Medical College Peking Union Youth Fund(3332015101)
- DOI：10.11889/j.1000-3436.2016.rrj.34.040201
  CLC：
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Zipo ZHAI, Hezheng ZHAI, Yongzhong MA, et al. Quality control test and assessment of helical tomotherapy unit. [J]. Journal of Radiation Research and Radiation Processing 34(4):23-26(2016)
DOI：

Zipo ZHAI, Hezheng ZHAI, Yongzhong MA, et al. Quality control test and assessment of helical tomotherapy unit. [J]. Journal of Radiation Research and Radiation Processing 34(4):23-26(2016) DOI： 10.11889/j.1000-3436.2016.rrj.34.040201.

摘要

对湖南省首台螺旋断层放射治疗（Tomotherapy，TOMO）系统进行质量控制验收检测，掌握设备的性能水平，为临床放射治疗提供保障。利用PTW UNIDOS剂量仪及其配套的电离室（0.6 cm,3,和0.125 cm,3,）、MatrixXX矩阵、EBT3胶片和模体，按照AAPM148报告，对TOMO的10个关键指标进行检测。结果显示：设备静态输出剂量偏差,<,0.1%，旋转输出剂量和计划剂量偏差-1.4%；射线质与标称值偏差0.3%；射野横向剂量曲线的对称性0.7%，射野纵向剂量曲线半高宽偏差0.5 mm；多叶准直器偏移偏差0.6 mm；绿激光灯指示虚拟等中心在,X,轴、,Y,轴和Z轴上的偏差均,<,1.0 mm；红激光灯指示和治疗床的移动偏差均,<,1.0 mm；治疗床和机架旋转同步性偏差0.6 mm。本次检测TOMO的10项关键指标均符合设备出厂指标要求，但仍需持续加强设备的质量控制检测。

Abstract

The investigation was conducted to evaluate the performance of the first tomotherapy (TOMO) in hunan to provide guarantee for clinical radiotherapy. PTW UNIDOS dosimeter and two ionization chambers (0.6 cm,3, and 0.125 cm,3,) were employed, together with MatrixXX, EBT3 films, and phantom, to test ten of the key indicators of TOMO, in accordance with the standards ,Specifications for Quality Control Test of Helical Tomotherapy Unit,. The results showed that there were some deviations in the indicators:a deviation less than 0.1% for static output dose, a deviation of -1.4% between the rotary output dose and the planned dose; a deviation of 0.3% for ray quality from the nominal value; a discrepancy of 0.7% for the transverse beam profile; a discrepancy of 0.5 mm for the FWHM of the longitudinal beam profiles; a deviation of 0.6 mm for multi-leaf collimator; a deviation less than 1.0 mm for virtual indication of green laser lights on ,X,-axis,Y,-axis and ,Z,-axis; a deviation lower than 1.0 mm between red laser light indication and movement of treatment couch; a 0.6 mm of synchronization deviation between couch and gantry rotation. So the 10 key indicators inspected are in line with the limits and indexes specified in ,Specifications for Quality Control Test of Helical Tomotherapy Unit,. However, consistent inspection of the apparatus is needed.

关键词

螺旋断层放射治疗质量控制吸收剂量百分深度剂量

Keywords

Helical TomotherapyQuality controlAbsorbed dosePercent depth dose

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