Development of an optical fiber based MR compatible gamma camera for SPECT/MRI system

光纤是一种很有前途的PET/MRI集成系统材料。然而，目前尚不清楚这种材料是否可以用于SPECT/MRI系统。我们开发并测试了一种用于SPECT/MRI系统的光纤块检测器，并测试了其性能。1.2 x 1.2 x 6mm的Y2SiO5 （YSO）像素被组合成一个15 x 15的块，并耦合到光纤图像波导上。导象器有一个22mm x 22mm的矩形输入和一个输出。光纤导像器的输入端弯曲90度，输出端光耦合到1英寸平方的高量子效率位置敏感光电倍增管（HQE-PSPMT）上。用钨塑料制成的平行孔准直器安装在YSO块上。对内在性能和系统性能进行了评估。系统在距准直器表面1.5mm处分辨率为1.7mm FWHM，灵敏度为0.06%。我们认为，基于光纤的YSO块检测器在SPECT/MRI系统中具有广阔的应用前景。

Optical fiber is a promising material for integrated PET/MRI systems. However, it is unclear this material can be used for a SPECT/MRI system. We developed and tested an optical fiber based block detector for SPECT/MRI system and tested its performance. 1.2 x 1.2 x 6mm Y2SiO5 (YSO) pixels were combined to form a 15 x 15 block and coupled to an optical fiber image guide. The image guide had a 22mm x 22mm rectangular input and an output. The input of the optical fiber based image guide was bent for 90 degree and the output was optically coupled to a 1-inch square high quantum efficiency position sensitive photomultiplier tube (HQE-PSPMT). Parallel hole collimator made of tungsten plastic was mounted on the YSO block. Intrinsic and system performance were evaluated. The system resolution was 1.7mm FWHM at 1.5mm from the collimator surface, and the sensitivity was 0.06%. We conclude that developed optical fiber based YSO block detector is promising for SPECT/MRI system.