Real-time system for respiratory-cardiac gating in positron tomography
Real-time system for respiratory-cardiac gating in positron tomography
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DOI：
10.1109/23.708323
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发表时间：
1998-08-01
影响因子：
1.8
通讯作者：
Huesman, RH
中科院分区：
文献类型：
--
作者：
Klein, GJ;Reutter, BW;Huesman, RH
开发了一种基于Macintosh的信号处理系统，以支持ECAT EXACT HR PET扫描仪上的同时呼吸和心脏门控。使用Lab-View实时软件环境，系统从气动呼吸风箱和ECG监视器读取模拟输入，以计算PET数据的适当直方图存储位置。呼吸状态由波纹管信号幅度确定;心脏状态基于自最后一个R波以来的时间。这两个状态在2D查找表中用于确定组合的心脏-心脏状态。对所选直方图进行编码的4位地址从系统发送到ECAT扫描仪，ECAT扫描仪会随着心脏状态的变化动态切换断层扫描事件的目的地。为了测试组合Macintosh/ECAT系统的切换效率，构建了一个旋转发射体模，体模以240 rpm旋转时的25 msec状态采集证明系统可以在该速率下有效停止运动，状态之间的切换时间约为5 msec。
A Macintosh-based signal processing system has been developed to support simultaneous respiratory and cardiac gating on the ECAT EXACT HR PET scanner. Using the Lab-View real-time software environment, the system reads analog inputs from a pneumatic respiratory bellows and an ECG monitor to compute an appropriate histogram memory location for the PET data. Respiratory state is determined by the bellows signal amplitude; cardiac state is based on the time since the last R-wave. These two states are used in a 2D lookup table to determine a combined respiratory-cardiac state. A 4-bit address encoding the selected histogram is directed from the system to the ECAT scanner, which dynamically switches the destination of tomograph events as respiratory-cardiac state changes. To test the switching efficiency of the combined Macintosh/ECAT system, a rotating emission phantom was built, Acquisitions with 25 msec states while the phantom was rotating at 240 rpm demonstrate the system could effectively stop motion at this rate, with approximately 5 msec switching time between states.