The ECAT HRRT: NEMA NEC evaluation of the HRRT system, the new high-resolution research tomograph
The ECAT HRRT: NEMA NEC evaluation of the HRRT system, the new high-resolution research tomograph
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DOI：
10.1109/tns.2002.803784
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发表时间：
2002-10-01
影响因子：
1.8
通讯作者：
Nutt, R
中科院分区：
文献类型：
--
作者：
Eriksson, L;Wienhard, K;Nutt, R
ECAT HRRT（高分辨率研究断层扫描仪）是一种仅限三维（3-D）的专用脑正电子发射断层扫描仪（PET），配有LSO和GSO放大器。该系统基于八个探测器面板。HRRT的成像性能之前已经在动物和人类大脑中进行了体模和FDG扫描测试，显示出显着提高的空间分辨率，动物研究低于2.5 mm，大脑研究低于3 mm。NEC计数率性能已根据NU 2-2001协议进行了评估。结果显示，峰值NEC比Ecat HR+的性能高约30%，尽管HRRT的探测器更浅，相对于HR+的30 mm仅为15 mm。然而，从70 cm线源体模导出的峰值NEC并未针对专用脑扫描仪的性能进行优化。用20 cm直径、20 cm长的体模获得的NEC数据显示，峰值NEC比HR+高60%以上。高性能的原因是由于几个因素，大的轴向覆盖，6 ns的短定时窗口，和低检测器死时间，所有因素都意味着使用快速LSO和GSO振荡器。
The ECAT HRRT (high-resolution research tomograph) is a three-dimensional (3-D)-only dedicated brain positron emission tomograph (PET) with LSO and GSO scintillators. The system is based on eight panels of detectors. The HRRT's imaging performance has previously been tested with phantoms and FDG scans performed in animal and human brains that showed significantly improved spatial resolution, below 2.5 mm for animal studies and below 3 mm for brain studies. The NEC count rate performance has been evaluated based on the NU 2-2001 protocol. The results show a peak NEC approximately 30% higher than the performance of the Ecat HR+, this in spite of a more shallow detector for the HRRT, only 15 mm relative to the 30 mm for the HR+. However, peak NEC as derived from the 70-cm line source phantom is not optimized for the performance of dedicated brain scanner. NEC data derived with a 20-cm diameter, 20-cm long phantoms show a peak NEC more than 60% higher than for the HR+. The reasons for the high performance are due to several factors, the large axial coverage, the short timing window of 6 ns, and the low detector dead time, all factors that imply the use of fast LSO and GSO scintillators.