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Sensors 2016, 16(10), 1748; doi:10.3390/s16101748

A Readout IC Using Two-Step Fastest Signal Identification for Compact Data Acquisition of PET Systems

Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Korea
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Author to whom correspondence should be addressed.
Academic Editors: Pak Kwong Chan and Holden King-Ho Li
Received: 19 August 2016 / Revised: 10 October 2016 / Accepted: 17 October 2016 / Published: 20 October 2016
(This article belongs to the Special Issue Smart Sensor Interface Circuits and Systems)
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Abstract

A readout integrated circuit (ROIC) using two-step fastest signal identification (FSI) is proposed to reduce the number of input channels of a data acquisition (DAQ) block with a high-channel reduction ratio. The two-step FSI enables the proposed ROIC to filter out useless input signals that arise from scattering and electrical noise without using complex and bulky circuits. In addition, an asynchronous fastest signal identifier and a self-trimmed comparator are proposed to identify the fastest signal without using a high-frequency clock and to reduce misidentification, respectively. The channel reduction ratio of the proposed ROIC is 16:1 and can be extended to 16 × N:1 using N ROICs. To verify the performance of the two-step FSI, the proposed ROIC was implemented into a gamma photon detector module using a Geiger-mode avalanche photodiode with a lutetium-yttrium oxyorthosilicate array. The measured minimum detectable time is 1 ns. The difference of the measured energy and timing resolution between with and without the two-step FSI are 0.8% and 0.2 ns, respectively, which are negligibly small. These measurement results show that the proposed ROIC using the two-step FSI reduces the number of input channels of the DAQ block without sacrificing the performance of the positron emission tomography (PET) systems. View Full-Text
Keywords: positron emission tomography; PET; fastest signal identification; readout IC; Geiger-mode avalanche photodiode; GAPD; lutetium-yttrium oxyorthosilicate; LYSO positron emission tomography; PET; fastest signal identification; readout IC; Geiger-mode avalanche photodiode; GAPD; lutetium-yttrium oxyorthosilicate; LYSO
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jung, S.-J.; Hong, S.-K.; Kwon, O.-K. A Readout IC Using Two-Step Fastest Signal Identification for Compact Data Acquisition of PET Systems. Sensors 2016, 16, 1748.

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