Repositioning accuracy of a novel thermoplastic mask for head and neck cancer radiotherapy
Repositioning accuracy of a novel thermoplastic mask for head and neck cancer radiotherapy
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DOI：
10.1016/j.ejmp.2020.05.005
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发表时间：
2020-06-01
影响因子：
3.4
通讯作者：
Seo, Yuji
中科院分区：
文献类型：
--
作者：
Fukao, Mari;Okamura, Keita;Seo, Yuji
目的：本研究的目的是评估一种新型和创新的原型面罩（E-Frame, Engineering System）固定患者肩部位置的可重复性。方法：与市售口罩（Type-S， CIVCO）进行比较，采用e框口罩固定双肩和双腋窝区域。分别使用Type-S和E-Frame面罩系统固定13例和12例患者。对于每个治疗部分，获取患者的锥束CT （CBCT）图像并进行回顾性分析。将CBCT图像配准到基于颈椎的规划CT上，测量锁骨肩峰端位移。结果：评价了两种掩模系统的系统误差和随机误差。两种掩模系统的系统误差差异无统计学意义。Type-S型口罩三个方向（AP、SI和LR）的平均随机误差分别为2.7 mm、3.1 mm和1.5 mm， E-Frame型口罩的平均随机误差分别为2.8 mm、2.5 mm和1.4 mm。E-Frame掩模在SI方向上的随机误差明显小于Type-S。s型和e型框架口罩至少有一个部分向SI方向移位超过10毫米的病例数分别为8例（13例中的61%）和3例（12例中的25%）。结论：E-Frame面罩减少了患者肩部在SI方向的随机移位，有效防止了s型面罩经常发生的肩部大位移。
Purpose: The aim of this study was to assess the reproducibility of patient shoulder position immobilized with a novel and innovative prototype mask (E-Frame, Engineering System).Methods: The E-frame mask fixes both shoulders and bisaxillary regions compared with that of a commercial mask (Type-S, CIVCO). Thirteen and twelve patients were immobilized with the Type-S and E-Frame mask systems, respectively. For each treatment fraction, cone-beam CT (CBCT) images of the patient were acquired and retrospectively analyzed. The CBCT images were registered to the planning CT based on the cervical spine, and then the displacements of the acromial extremity of the clavicle were measured.Results: The systematic and random errors between the two mask systems were evaluated. The differences of the systematic errors between the two mask systems were not statistically significant. The mean random errors in the three directions (AP, SI and LR) were 2.7 mm, 3.1 mm and 1.5 mm, respectively for the Type-S mask, and 2.8 mm 2.5 mm and 1.4 mm, respectively for the E-Frame mask. The random error of the E-Frame masks in the SI direction was significantly smaller than that of the Type-S. The number of cases showing displacements exceeding 10 mm in the SI direction for at least one fraction was eight (61% of 13 cases) and three (25% of 12 cases) for Type-S and E-Frame masks, respectively.Conclusions: The E-Frame masks reduced the random displacements of patient's shoulders in the SI direction, effectively preventing large shoulder shifts that occurred frequently with Type-S masks.