A silicon photo-multiplier signal readout using strip-line and waveform sampling for Positron Emission Tomography

作者：Kim H^*; Chen C T; Eclov N; Ronzhin A; Murat P; Ramberg E; Los S; Kao C M

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 830: 119-129.

DOI：10.1016/j.nima.2016.05.085

• Positron Emission Tomography
• Strip-Line Readout
• Waveform Sampling
• Multiplexing

A strip-line and waveform sampling based readout is a signal multiplexing method that can efficiently reduce the readout channels while fully exploiting the fast time characteristics of photo-detectors such as the SiPM. We have applied this readout method for SiPM-based time-of-flight (TOF) positron emission tomography (PET) detectors. We have prototyped strip-line boards in which 8 SiPMs (pitch 5.2 mm) are connected by using a single strip-line, and the signals appearing at the ends of the strip-line are acquired by using the DRS4 waveform sampler at a nominal sampling frequency of 1-5 GS/s. Experimental tests using laser and LYSO scintillator are carried out to assess the performance of the strip-line board. Each SiPM position, which is inferred from the arrival time difference of the two signals at the ends of the strip-line, is well identified with 2.6 mm FWHM resolution when the SiPMs are coupled to LYSO crystals and irradiated by a Na-22 source. The average energy and coincidence time resolution corresponding to 511 key photons are measured to be similar to 32% and similar to 510 ps FWHM, respectively, at a 5.0 GS/s DRS4 sampling rate. The results show that the sampling rate can be lowered to 1.5 GS/s without performance degradation. These encouraging initial test results indicate that the strip-line and waveform sampling readout method is applicable for SiPM-based TOF PET development.

• 出版日期2016-9-11