A QTC-based signal readout for position-sensitive multi-output detectors

Zhou, Wei; Zhang, Zhiming; Li, Daowu; Wang, Peilin; Feng, Baojie; Huang, Xianchao; Hu, Tingting; Li, Xiaohui; Chen, Yan; Wang, Yingjie; Liu, Yantao; Zhang, Yiwen; Sun, Shaobo; Gu, Xiaoyue; Yang, Mingjie; Xiao, Xiong; Wei, Long

doi:10.1007/s41365-016-0124-4

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Figure 6b is the simulation result of the transimpedance amplifier, and it shows that, for the applied input current of 1 μA the corresponding output voltage is 1 mV, according to that given by Equation (9). The current from the PSPMT is in the range of tens of μA and Figure 6c shows the linearity of the TIA for the current range from 1 μA to 1 mA.…”

Section: Operational Amplifier (Opa) As Current To Voltage Convertermentioning

confidence: 89%

“…OPAs are the most used devices for designing the various modules of the readout system as shown in Figure 1 which is modified from reference [9], including transimpedance amplifiers for current to voltage conversion, adders for signal regrouping and integrators for charge to time conversion. The operational amplifier required to design these circuits should have high gain, higher bandwidth, and high speed so that it can process the shortrise time and weak signals obtained from the photomultiplier tube (PMT).…”

Section: Methodsmentioning

confidence: 99%

“…The PSPMT current signals are conventionally processed by a preamplifier and a shaping circuit, and the shaped signals are converted into digital signals using analog to digital converters. A special algorithm is used to extract the energy and position of the radiation from the digital signals [9,10]. Conventionally, these circuits that process the PSPMT signals are built using an operational amplifier (OPA), and they must be placed in very close proximity to the detector to reduce signal loss and distortion, and hence their operation environment is radiative.…”

Section: Introductionmentioning

confidence: 99%

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GaN-Based Readout Circuit System for Reliable Prompt Gamma Imaging in Proton Therapy

2021

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Prompt gamma imaging is one of the emerging techniques used in proton therapy for in-vivo range verification. Prompt gamma signals are generated during therapy due to the nuclear interaction between beam particles and nuclei of the tissue that is detected and processed in order to obtain the position and energy of the event so that the benefits of Bragg’s peak can be fully utilized. This work aims to develop a gallium nitride (GaN)-based readout system for position-sensitive detectors. An operational amplifier is the module most used in such a system to process the detector signal, and a GaN-based operational amplifier (OPA) is designed and simulated in LTSpice. The designed circuit had an open-loop gain of 70 dB and a unity gain frequency of 34 MHz. The slew rate of OPA was 20 V/μs and common mode rejection ratio was 84.2 dB. A simulation model of the readout circuit system using the GaN-based operational amplifier was also designed, and the result showed that the system can successfully process the prompt gamma signals. Due to the radiation hardness of GaN devices, the readout circuit system is expected to be more reliable than its silicon counterpart.

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Section: Operational Amplifier (Opa) As Current To Voltage Convertermentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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GaN-Based Readout Circuit System for Reliable Prompt Gamma Imaging in Proton Therapy

2021

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A compact, high signal-to-noise ratio line-detector array Compton scatter imaging system based on silicon photomultipliers

Xiao

Liu

Cao

et al. 2019

Applied Radiation and Isotopes

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A hybrid coded-aperture and Compton camera based on cerium-doped Gd3Al2Ga3O12 scintillators coupled with multi-pixel photon counter arrays

Kong

Shuai

Liang

et al. 2022

Review of Scientific Instruments

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In this study, we propose a hybrid coded-aperture and Compton camera based on cerium-doped Gd3Al2Ga3O12 (GAGG:Ce) scintillator arrays coupled with Multi-Pixel Photon Counter (MPPC) arrays. The sensitive detector of the gamma camera consists of a single GAGG:Ce crystal coupled with a single-chip MPPC unit module. An impedance bridge circuit and a 64-channel data acquisition system were employed to record the code-aperture events and Compton coincidence events. After the calibration of position and energy, the total energy resolution for 662 keV gamma-rays from 137Cs was 6.6%. The hybrid camera had the characteristics of mechanical collimation and electronic collimation at the same time. In the code aperture mode, the reconstructed images were obtained by direct deconvolution and maximum likelihood expectation maximization (MLEM) methods. In the Compton imaging mode, the energy-dependent method was applied to order the sequence of Compton scatter events. The simple back-projection algorithm and list-mode MLEM algorithm were adopted for image reconstruction. Practical performances demonstrated that the angular resolutions in two modes were measured as 5.2° and 11.4°, respectively. In addition, the hybrid camera had a desirable imaging capability in a wide energy range (32 keV–2.6 MeV) and a wide field of view (∼210° in the horizontal direction). As for the sensitivity, the camera had a commercially available sensitivity level of localizing a 137Cs point source, producing ∼0.026 µSv/h in 5 min. Furthermore, the function of distinction for different radiation sources was preliminarily realized.

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A QTC-based signal readout for position-sensitive multi-output detectors

Cited by 5 publications

References 22 publications

GaN-Based Readout Circuit System for Reliable Prompt Gamma Imaging in Proton Therapy

GaN-Based Readout Circuit System for Reliable Prompt Gamma Imaging in Proton Therapy

A compact, high signal-to-noise ratio line-detector array Compton scatter imaging system based on silicon photomultipliers

A hybrid coded-aperture and Compton camera based on cerium-doped Gd3Al2Ga3O12 scintillators coupled with multi-pixel photon counter arrays

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