| Zheng Yaqin,Cui Tong,Zheng Xuliang,Liu Jianting,Xing Xiaofen.Influences of various field-defining methods of Varian accelerator on radiation dosimetry parameters[J].Chinese Journal of Radiological Medicine and Protection,2017,37(9):709-712 |
| Influences of various field-defining methods of Varian accelerator on radiation dosimetry parameters |
| Received:March 09, 2017 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.09.014 |
| KeyWords:Field defining method Intensity modulated radiotherapy Dosimetry |
| FundProject:山西省卫生计生委科研课题资助（2015057）。 |
| Author Name | Affiliation | E-mail | | Zheng Yaqin | Center of Radiation Oncology, Shanxi Cancer Hospital, Affiliated Cancer Hospital of Shanxi Medical University, Taiyuan 030013, China | | | Cui Tong | Center of Radiation Oncology, Shanxi Cancer Hospital, Affiliated Cancer Hospital of Shanxi Medical University, Taiyuan 030013, China | | | Zheng Xuliang | Center of Radiation Oncology, Shanxi Cancer Hospital, Affiliated Cancer Hospital of Shanxi Medical University, Taiyuan 030013, China | | | Liu Jianting | Center of Radiation Oncology, Shanxi Cancer Hospital, Affiliated Cancer Hospital of Shanxi Medical University, Taiyuan 030013, China | | | Xing Xiaofen | Center of Radiation Oncology, Shanxi Cancer Hospital, Affiliated Cancer Hospital of Shanxi Medical University, Taiyuan 030013, China | tyxxf@126.com |
|
| Hits: 2667 |
| Download times: 2352 |
| Abstract:: |
| Objective To evaluate the influences of various field-defining method of Varian accelerator on radiation dosimetry parameters, and provide theoretical basis for the beam modeling of the treatment planning system (TPS).Methods The percentage depth dose (PDD), the off-axis ratio (OAR) and the total scattering factors (Scp) of radiation fields were measured in three different conditions, including collimators (JAW), multileaf collimator(MLC) and JAW+MLC. The measured data was analyzed and compared with each other.Results The PDD of central axis was marginally influenced by three field-defining method. In both directions, the MLC-defined field sizes were larger by a maximum of 2.9 mm (left-right) or 1.7 mm (gun-target) than the JAW-defined ones. In the left-right direction, the width of field penumbra shaped by MLC was larger than the field of the same size as defined by JAW. The result of gun-target direction was to the contrary. In both directions, the field penumbra and size displayed no significant differences as defined by JAW+MLC or JAW.Conclusions The field size, penumbra width, and the total scattering factors were influenced by field-defining method, which indicates that special attention should be paid to the dosimetric parameters of MLC during TPS beam modeling for IMRT planning. |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
