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

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 f...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2016-10, Vol.16 (10), p.1748-1748
Main Authors: Jung, Sung-Jin, Hong, Seong-Kwan, Kwon, Oh-Kyong
Format: Article
Language:English
Subjects:
Arrays
Channels
Data acquisition
Detectors
Equipment Design
fastest signal identification
GAPD
Geiger-mode avalanche photodiode
Inertia
Integrated circuits
Limit of Detection
Lutetium - chemistry
lutetium-yttrium oxyorthosilicate
LYSO
PET
Positron emission
positron emission tomography
Positron-Emission Tomography - methods
readout IC
Reduction
Scanners
Sensors
Signal processing
Silicates - chemistry
Tomography
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Summary: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 × :1 using 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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16101748