Novel Electro-Optical Coupling Technique for Magnetic Resonance-Compatible Positron Emission Tomography Detectors
Novel Electro-Optical Coupling Technique for Magnetic Resonance-Compatible Positron Emission Tomography Detectors
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DOI：
10.2310/7290.2009.00012
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发表时间：
2009-03-01
影响因子：
2.8
通讯作者：
Levin, Craig S.
中科院分区：
文献类型：
--
作者：
Olcott, Peter D.;Peng, Hao;Levin, Craig S.
正在开发一种新的磁共振成像（MRI）兼容的正电子发射断层摄影（PET）探测器设计，其使用电光耦合将高速PET探测器闪烁脉冲的幅度和到达时间信息带出MRI系统。电光耦合技术由磁不敏感光电探测器输出信号连接到耦合到多模光纤的垂直腔面发射激光器（VCSEL）二极管组成。该方案基本上充当对MRI系统没有影响的光学导线。为了测试这种方法的可行性，耦合到固态光电倍增管阵列的单个像素的氧正硅酸镥钇晶体与耦合到快速光电倍增管的氧正硅酸镥晶体重合放置，该快速光电倍增管具有新的VCSEL耦合和标准同轴电缆信号传输方案。在511 keV的峰值能量分辨率和符合时间分辨率没有观察到显着的变化。与当前MRI/PET设计中部署的信号传输方案相比，这种电光耦合技术使MRI兼容的PET块探测器具有减少的电磁足迹。
A new magnetic resonance imaging (MRI)-compatible positron emission tomography (PET) detector design is being developed that uses electro-optical coupling to bring the amplitude and arrival time information of high-speed PET detector scintillation pulses out of an MRI system. The electro-optical coupling technology consists of a magnetically insensitive photodetector output signal connected to a nonmagnetic vertical cavity surface emitting laser (VCSEL) diode that is coupled to a multimode optical fiber. This scheme essentially acts as an optical wire with no influence on the MRI system. To test the feasibility of this approach, a lutetium-yttrium oxyorthosilicate crystal coupled to a single pixel of a solid-state photomultiplier array was placed in coincidence with a lutetium oxyorthosilicate crystal coupled to a fast photomultiplier tube with both the new nonmagnetic VCSEL coupling and the standard coaxial cable signal transmission scheme. No significant change was observed in 511 keV photopeak energy resolution and coincidence time resolution. This electro-optical coupling technology enables an MRI-compatible PET block detector to have a reduced electromagnetic footprint compared with the signal transmission schemes deployed in the current MRI/PET designs.