Beam scanning performance verification of domestic NT-AD200 three-dimensional water tank(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2019年第2期
- Page:
- 125-129
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Beam scanning performance verification of domestic NT-AD200 three-dimensional water tank
- Author(s):
- HU Jinyou1; XIE Zhao1; LIU Xiangxiang1; YIN Yunpeng1; ZOU Lian1; 2
- 1. Cancer Center, Sichuan Provincial People’s Hospital, Chengdu 610072, China; 2. Research Center for Medical Robotics and Minimally Invasive Surgical Devices, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
- Keywords:
- ; Keywords: NT-AD200; Blue Phantom 2; three-dimensional water tank; percent depth dose; off-axis ratio curve
- PACS:
- R312；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2019.02.001
- Abstract:
- Abstract: Objective To comprehensively understand the beam scanning accuracy and performance of domestic NT-AD200 three-dimensional water tank (National Institute of Measurement and Testing Technology of China). Methods Blue Phantom 2 three-dimensional water tank (IBA Dosimetry GmbH) was used as reference. The 6 MV photon dosimetry data of TrueBeam medical linear accelerator (Varian Medical Systems, Inc.) were separately collected with NT-AD200 three-dimensional water tank and Blue Phantom 2 three-dimensional water tank. The percent depth dose (PDD) curves with source-to-surface distance of 100 cm and different field sizes were obtained, and off-axis ration (OAR) curves of different depths under the same field conditions were measured. Results NT-AD200 was inferior to imported equipment in terms of mechanical control and ease of use. For beam scanning performance, based on the baseline of BluePhantom 2, the mean dose deviation outside the PDD built-up area was less than 1%, and the standard deviation was less than 0.3%. The maximum dose deviation in the built-up area appeared in the irradiation field of (3×3) cm2, which was -5.23%±7.41%. The average deviation of the OAR curve within 80% of the field size was less than 1%, and the standard deviation was less than 0.3%. The mean dose deviation within 80%-120% of the field size (penumbra area) was less than 1%, but the standard deviation was 0.51-1.31%. The OAR of NT-AD200 water tank was about 1% larger than that of Blue Phantom 2 water tank at the outside of 120% of the field size. Conclusion The dosimetric data collected with NT-AD200 three-dimensional water tank and Blue Phantom 2 three-dimensional water tank have a good agreement, and the beam scanning performance of domestic NT-AD200 3D water tank is close to that of imported equipment.
Last Update: 2019-02-26