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DATA ACQUISITION SYSTEM FOR SiPM DETECTORS WITH BGO

IP.com Disclosure Number: IPCOM000237017D
Publication Date: 2014-May-27
Document File: 6 page(s) / 137K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique to read out a large complementary metal–oxide–semiconductor silicon photomultiplier (CMOS SiPM) array at a high multiplexing level in a PET system. The technique includes two methods to read out a large CMOS SiPM array at a high multiplexing level to simplify electronics. The technique allows lowering down expense of a detector. Two methods in the technique include achieving multiplexing in digital domain and in analog domain.

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DATA ACQUISITION SYSTEM FOR SiPM DETECTORS WITH BGO

BRIEF ABSTRACT

The invention proposes a technique to read out a large complementary metal–oxide–semiconductor silicon photomultiplier (CMOS SiPM) array at a high multiplexing level in a PET system. The technique includes two methods to read out a large CMOS SiPM array at a high multiplexing level to simplify electronics. The technique allows lowering down expense of a detector.  Two methods in the technique include achieving multiplexing in digital domain and in analog domain.

KEYWORDS

BGO, CMOS SiPM, Multiplexing, PET system


DETAILED DESCRIPTION

During working with bismuth germanium oxide (BGO) in an economical positron emission tomography (PET) system, a complementary metal–oxide–semiconductor Silicon Photomultiplier (CMOS SiPM) sensor generates signals. The CMOS SiPM generated signals are smaller in amplitude, slow with rising time and has a long tail.

A conventional technique includes multiple anodes summed together to form one single timing channel. However, the technique increases expense of the PET system.

Therefore, there is a need for a technique that provides economical system with respect to multiplexing in PET system.

The invention proposes a technique to read out a large CMOS SiPM array at a high multiplexing level in a PET system. The technique includes two methods to read out a large CMOS SiPM array at a high multiplexing level to simplify electronics. The technique allows lowering down expense of a detector. Two methods in the technique include achieving multiplexing in digital domain and in analog domain.

The multiplexing technique picks up accurate timing information out of the sensor by utilizing pixel specific timing channel. Simultaneously, the technique reduces complexity of the electronics by multiplexing validated hit signal to Time to Digital Converter (TDC). Energy from channels hits to apparent diffusion coefficient (ADC) without summing dark counts from other channel. Both methods provide first two hits corresponding to highest two energies which covers most of a Compton scatter.

In multiplexing in digital domain, every channel generates two digital signals, which include HitP and HitV. To set a threshold for primary discriminator at a low level, the threshold has high trigger rate due to dark counts. Validation discriminator is utilized to reduce the dead time. HitV and delayed HitP generate the Hit_ch signal for each individual channel. Due to Compton scatter, a user acquires multiple h...