基于磁定位技术的放疗呼吸曲线检测系统的设计与应用  

Design and Application of a Respiratory Curve Detecting System for RT Based on Magnetic Positioning Technology

作　　者：王旋[1] 敦煌俊秋[1] 汤福南[1] 张可[1] 吴小玲[1] 

机构地区：[1]南京医科大学生物医学工程系,江苏南京210029

出　　处：《中国医疗设备》2015年第6期42-45,32,共5页China Medical Devices

摘　　要：目的设计基于磁定位技术的放疗呼吸曲线检测系统,用于实时检测患者的呼吸曲线,控制放射治疗床三维反向运动以抵消因呼吸因素造成的靶区位移,实现靶区的相对静止。方法在受试者胸腹部体表粘贴小磁体,通过磁阻传感器检测小磁体的磁场信号,对其进行处理和变换,得到其位移信息,再通过上位机软件(Lab VIEW)实时显示受试者的呼吸曲线。结果该系统实现了小磁体运动位置及受试者呼吸曲线的实时显示及数据存储。结论基于磁定位技术的放疗呼吸曲线检测系统可实时、准确地获取受试者的呼吸曲线,为胸腹部动态放疗中患者呼吸曲线的获取提供了一种新的方法。Objective To design a respiratory curve detecting system for RT （Radiotherapy） based on the technology of magnetic positioning, which was intended for real-time detection of the patients’ respiratory curve, controlling the three-dimensional inverse kinematics of RT beds for offsetting the respiratory-factor-caused location changes of the target area and could realize the relatively static status of the target.Methods The magneto-resistive sensors was used to detect magnetic ifeld signal of small magnet which had been pasted on the surface of the patient’s chest. Then, location changes could be obtained through the signal processing and conversion. Finally, a PC software （LabVIEW） was deployed real-timely to display the patients’respiratory curve.Results The system realized the real-time display and data storage of small magnet position movement and the patients’respiratory curve.Conclusion The experimental results showed that this magnetic-positioning-based system could real-timely and accurately acquire the patients’respiratory curve, which provided a new method for acquisition of the patients’ respiratory curve in thoracic-abdominal dynamic RT.

关 键 词：磁定位技术 呼吸曲线 动态放疗 单片机 LABVIEW 

分 类 号：TP311.52[自动化与计算机技术—计算机软件与理论]