Evaluation of setup uncertainties for single-fraction SRS by comparing two different mask-creation methods

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• 作者：Jong Geun Baek ; Hyun Soo Jang ; Young Kee Oh…
• 关键词：Setup uncertainties ; Systematic uncertainties ; BrainLAB mask ; Target positioner
• 刊名：Journal of the Korean Physical Society
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：67
• 期：1
• 页码：38-43
• 全文大小：624 KB
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• 作者单位：Jong Geun Baek (1) (2)
  Hyun Soo Jang (2)
  Young Kee Oh (3)
  Hyun Jeong Lee (4)
  Eng Chan Kim (4)
  
  1. Department of Physics, Yeungnam University, Gyeongsan, 712-749, Korea
  2. Department of Radiation Oncology, Dongguk University Gyeongju Hospital, Gyeongju, 780-350, Korea
  3. Department of Radiation Oncology, Keimyung University Dongsan Medical Center, Daegu, 700-712, Korea
  4. Department of Physics, Yeungnam University, Gyeongsan, 712-749, Korea
  
• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：Springer Netherlands
• ISSN：1976-8524

文摘

The purpose of this study was to evaluate the setup uncertainties for single-fraction stereotactic radiosurgery (SF-SRS) based on clinical data with two different mask-creation methods using pretreatment con-beam computed tomography imaging guidance. Dedicated frameless fixation Brain- LAB masks for 23 patients were created as a routine mask (R-mask) making method, as explained in the BrainLAB’s user manual. Alternative masks (A-masks), which were created by modifying the cover range of the R-masks for the patient’s head, were used for 23 patients. The systematic errors including these for each mask and stereotactic target localizer were analyzed, and the errors were calculated as the means ± standard deviations (SD) from the left-right (LR), superior-inferior (SI), anterior-posterior (AP), and yaw setup corrections. In addition, the frequencies of the threedimensional (3D) vector length were analyzed. The values of the mean setup corrections for the R-mask in all directions were < 0.7 mm and < 0.1°, whereas the magnitudes of the SDs were relatively large compared to the mean values. In contrast, the means and SDs of the A-mask were smaller than those for the R-mask with the exception of the SD in the AP direction. The means and SDs in the yaw rotational direction for the R-mask and the A-mask system were comparable. 3D vector shifts of larger magnitude occurred more frequently for the R-mask than the A-mask. The setup uncertainties for each mask with the stereotactic localizing system had an asymmetric offset towards the positive AP direction. The A-mask-creation method, which is capable of covering the top of the patient’s head, is superior to that for the R-mask, so the use of the A-mask is encouraged for SF-SRS to reduce the setup uncertainties. Moreover, careful mask-making is required to prevent possible setup uncertainties.