title: A Silicon Photo-multiplier Signal Readout Using Strip-line and Waveform Sampling for Positron Emission Tomography.
abstract: 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 a22Na source. The average energy and coincidence time resolution responding to 511 keV photons are measured to be ~32% and ~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.
authors.affiliation: Department of Radiology, University of Chicago, Chicago, IL 60637.
authors.forename: H
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Radiology, University of Chicago, Chicago, IL 60637.
authors.forename: C-T
authors.initials: CT
authors.lastname: Chen
authors.affiliation: Department of Radiology, University of Chicago, Chicago, IL 60637.
authors.forename: N
authors.initials: N
authors.lastname: Eclov
authors.affiliation: Fermi National Accelerator Laboratory, IL, US.
authors.forename: A
authors.initials: A
authors.lastname: Ronzhin
authors.affiliation: Fermi National Accelerator Laboratory, IL, US.
authors.forename: P
authors.initials: P
authors.lastname: Murat
authors.affiliation: Fermi National Accelerator Laboratory, IL, US.
authors.forename: E
authors.initials: E
authors.lastname: Ramberg
authors.affiliation: Fermi National Accelerator Laboratory, IL, US.
authors.forename: S
authors.initials: S
authors.lastname: Los
authors.affiliation: Department of Radiology, University of Chicago, Chicago, IL 60637.
authors.forename: C-M
authors.initials: CM
authors.lastname: Kao
keywords: Multiplexing; Positron Emission Tomography; Strip-Line Readout; Waveform Sampling