Department of Radiation Oncology, Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu 431-3192, Japan.
J Radiat Res. 2022 Jul 19;63(4):699-705. doi: 10.1093/jrr/rrac019.
This study used cine-magnetic resonance imaging (cine-MRI) to evaluate the safety and efficacy of a novel airbag system combined with a shell-type body fixation system in reducing respiratory motion in normal volunteers. The airbag system consists of a six-sided polygon inflatable airbag, a same shape plate, a stiff air supply tube, an air-supply pump and a digital pressure load cell monitor. Piezoelectric sensors were installed in the plate to detect compression pressure load changes; pressure load data were transferred to the digital pressure load cell monitor through Bluetooth. Five volunteers underwent cine-MRI with and without airbag compression to detect differences in the respiratory motion of the organs. The volunteers' physiologic signs were stable during the experiment. The maximum inspiration pressure load was 4.48 ± 0.86 kgf (range, 4.00-6.00 kgf), while the minimum expiration pressure load was 3.69 ± 0.95 kgf (range, 2.8-5.3 kgf). Under airbag compression, the right diaphragm movement was reduced from 19.50 ± 6.43 mm to 9.60 ± 3.61 mm (P < 0.05) in the coronal plane and 23.12 ± 6.30 mm to 11.00 ± 3.69 mm (P < 0.05) in the sagittal plane. The left diaphragm, pancreas and liver in the coronal plane and the right kidney and liver in the sagittal plane also showed significant movement reduction. This novel airbag abdominal compression system was found to be safe during the experiment and successful in the reduction of internal organ respiratory motion and promises to be a convenient and efficient tool for clinical radiotherapy.
本研究采用电影磁共振成像（cine-MRI）评估新型气囊系统联合壳型体固定系统在减少正常志愿者呼吸运动中的安全性和有效性。气囊系统由六边形成型可充气气囊、同形状板、刚性供气管、供气泵和数字压力负荷细胞监视器组成。在板上安装了压电传感器以检测压缩压力负荷变化；压力负荷数据通过蓝牙传输到数字压力负荷细胞监视器。五名志愿者进行了 cine-MRI 检查，同时记录有无气囊压缩，以检测器官呼吸运动的差异。实验过程中志愿者的生理体征稳定。最大吸气压力负荷为 4.48±0.86 kgf（范围 4.00-6.00 kgf），最小呼气压力负荷为 3.69±0.95 kgf（范围 2.8-5.3 kgf）。在气囊压缩下，右侧膈肌运动在冠状面从 19.50±6.43mm 减少至 9.60±3.61mm（P<0.05），在矢状面从 23.12±6.30mm 减少至 11.00±3.69mm（P<0.05）。在冠状面的左侧膈肌、胰腺和肝脏，以及矢状面的右侧肾脏和肝脏也显示出明显的运动减少。该新型气囊腹部压缩系统在实验过程中被发现是安全的，并且成功地减少了内部器官的呼吸运动，有望成为临床放射治疗的一种方便有效的工具。
