原子能科学技术2011，Vol.45Issue(5)：637-640,4.
正电子发射断层成像系统中数字化多通道时间数字转换研究
Multi-channel Digitized Time-to-Digital Converter of Positron Emission Tomography System
摘要
Abstract
High precision time-to-digital converter (TDC) in positron emission tomography (PET) system was studied with the delay chains in field-programmable-gatearray (FPGA). Time measurement includes two parts, coarse time measurement implemented by a clock-driven counter, fine time measurement by delay chains in FPGA. Differential nonlinearity (DNL) and integral nonlinearity (INL) were tested, and also, total time resolution of the double-detector PET experimental platform was measured by time coincidence. The results demonstrate that the time resolution of TDC reaches 79.3 ps, and the DNL is between -0. 2 LSB and 0.2 LSB, the INL is between -0.2 LSB and 0. 3 LSB, the total time resolution of the double-detector PET experimental platform reaches 2. 1 ns. Performance of the TDC, implemented in FPGA, can meet the demand of time measurement in PET system.关键词
正电子发射断层成像/时间数字转换/FPGAKey words
positron emission tomography/ time-to-digital converter/ field-programmable-gate-array分类
信息技术与安全科学引用本文复制引用
王培林,柴培,贠明凯,章志明,魏龙,李道武,丰宝桐,帅磊,孙芸华,胡婷婷,魏书军,黄先超,廖燕飞..正电子发射断层成像系统中数字化多通道时间数字转换研究[J].原子能科学技术,2011,45(5):637-640,4.基金项目
国家自然科学基金资助项目(10905066) （10905066）
中国科学院知识创新工程重要方向项目资助(KJCX2-EW-N06) （KJCX2-EW-N06）
