Radiologische Klinik, FE Strahlentherapie, Universitätsklinik Bonn, Sigmund-Freud-Str. 25, 53105, Bonn, Germany,
Strahlenther Onkol. 2014 Apr;190(4):382-5. doi: 10.1007/s00066-013-0496-x. Epub 2013 Dec 11.
Patient immobilization during brain tumor radiotherapy is achieved by employing different mask systems. Two innovative mask systems were developed to minimize the problems of claustrophobic patients. Our aim was to evaluate whether the quality of patient immobilization using the new mask systems was equivalent to the standard mask system currently in use.
Thirty-three patients with cerebral target volumes were irradiated using the Hi-Art II tomotherapy system between 2010 and 2012. Each group of 11 patients was fitted with one of the two new mask systems (Crystal® or Open Face® mask, Orfit) or the standard three-point mask (Raycast®-HP, Orfit) and a total of 557 radiotherapy fractions were evaluated. After positioning was checked by MV-CT, the necessary table adjustments were noted. Data were analyzed by comparing the groups, and safety margins were calculated for nonimage-guided irradiation.
The mean values of the table adjustments were: (a) lateral (mm): - 0.22 (mask 1, standard deviation (σ): 2.15); 1.1 (mask 2, σ: 2.4); - 0.64 (mask 3, σ: 2.9); (b) longitudinal (mm): - 1 (mask 1, σ: 2.57); - 0.5 (mask 2, σ: 4.7); - 1.22 (mask 3, σ: 2.52); (c) vertical (mm): 0.62 (mask 1, σ: 0.63); 1.2 (mask 2, σ: 1.0); 0.57 (mask 3, σ: 0.28); (d) roll: 0.35° (mask 1, σ: 0.75); 0° (mask 2, σ: 0.8); 0.02° (mask 3, σ: 1.12). The outcomes suggest necessary safety margins of 5.49-7.38 mm (lateral), 5.4-6.56 mm (longitudinal), 0.82-3.9 mm (vertical), and 1.93-4.5° (roll). There were no significant differences between the groups.
The new mask systems improve patient comfort while providing consistent patient positioning.
在脑肿瘤放射治疗中，通过使用不同的面罩系统来实现患者的固定。两种创新的面罩系统已被开发出来，以最小化幽闭恐惧症患者的问题。我们的目的是评估使用新面罩系统进行患者固定的质量是否等同于目前使用的标准面罩系统。
2010 年至 2012 年期间，使用 Hi-Art II 断层放疗系统对 33 例颅内靶区患者进行放疗。每组 11 例患者分别使用两种新面罩系统（Crystal®或 Open Face®面罩，Orfit）或标准三点式面罩（Raycast®-HP，Orfit）进行固定，并对 557 个放疗分次进行评估。在 MV-CT 检查定位后，记录必要的床面调整。通过组间比较分析数据，并计算非图像引导放疗的安全边界。
床面调整的平均值为：（a）侧向（mm）：-0.22（面罩 1，标准差（σ）：2.15）；1.1（面罩 2，σ：2.4）；-0.64（面罩 3，σ：2.9）；（b）纵向（mm）：-1（面罩 1，σ：2.57）；-0.5（面罩 2，σ：4.7）；-1.22（面罩 3，σ：2.52）；（c）垂直（mm）：0.62（面罩 1，σ：0.63）；1.2（面罩 2，σ：1.0）；0.57（面罩 3，σ：0.28）；（d）旋转（°）：0.35（面罩 1，σ：0.75）；0（面罩 2，σ：0.8）；0.02（面罩 3，σ：1.12）。结果表明，侧向、纵向、垂直和旋转方向的安全边界分别为 5.49-7.38mm、5.4-6.56mm、0.82-3.9mm 和 1.93-4.5°。各组之间无显著差异。
新型面罩系统在提高患者舒适度的同时，提供了一致的患者定位。
