Speaker
Takahiro Ambe
(http://www.spxg-lab.phys.waseda.ac.jp/)
Description
We developed a front-end ASIC for future PET scanners with time-of-flight (TOF)
capability to be coupled with 4×4 Multi Pixel Photon Counter (MPPC) arrays.
The ASIC is designed based on the open-IP project proposed by JAXA and realized in
TSMC 0.35 μm CMOS technology. The circuit comprises 16-channel, low impedance
current conveyers to effectively acquire fast MPPC signals. For precise measurement
of coincidence timing of 511 keV gamma-rays, the leading-edge method was used to
discriminate the signal.
We first tested a time response of the ASIC by illuminating each channel of a MPPC
array device of 3 × 3 mm2 in size with a Pico-second Light Pulsar with light emission peak
of 655 nm and pulse duration of 54 ps (FWHM). We obtained 105 ps (FWHM) on the average of each channel for the time jitter measurements. Moreover, we compensated for time lags of each channel with inner delay circuits and succeeded in suppressing about-700ps-lag to 15ps.
We will also report on the TOF measurements using back-to-back 511 keV signals, and suggest that the ASIC can be a promising device for futureTOF-PET scanners based on the MPPC array.
Author
Takahiro Ambe
(http://www.spxg-lab.phys.waseda.ac.jp/)
Co-authors
Hidenori Matsuda
(Waseda University)
Hirokazu Ikeda
(JAXA)
Jun Kataoka
(Waseda University)
Takuya Kato
(Waseda University)
