Qiyu Peng
Lawrence Berkeley National Laboratory
Imaging phantomSilicon photomultiplierSignalOpticsPhysicsElectronicsIterative reconstructionPhotonScintillatorDark currentMaterials scienceImage resolutionSensitivity (control systems)Electronic engineeringPositron emission tomographyScannerLyso-Computer scienceField-programmable gate arrayImage qualityResolution (electron density)Detector
72Publications
9H-index
324Citations
Publications 59
Newest
#1Siwei XieH-Index: 5
Last. Qiyu PengH-Index: 9
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As a commonly used solution, the multi-ended readout can measure the depth-of-interaction (DOI) for positron emission tomography (PET) detectors. In the present study, the effects of the multi-ended readout design were investigated using the leading-edge discriminator (LED) triggers on the timing performance of time-of-flight (TOF) PET detectors. At the very first, the photon transmission model of the four detectors, namely, single-ended readout, dual-ended readout, side dual-ended readout, and ...
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#1Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 3
#1Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 7
Last. Qiyu PengH-Index: 9
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Preclinical positron emission tomography (PET) is a sensitive and quantitative molecule imaging modality widely used in characterizing the biological processes and diseases in small animals. The purpose of this study is to investigate the methods to optimize a PET detector for high-resolution preclinical imaging. The PET detector proposed in this study consists of a 28×28 array of LYSO crystals 0.5×0.5×6.25 mm3 in size, a wedged lightguide, and a 6×6 array of SiPMs 3×3 mm2 in size. The simulatio...
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#1Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 3
#1Xi ZhangH-Index: 7
Last. Qiyu PengH-Index: 9
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Portable radiation detectors are widely used in environmental radiation detection and medical imaging due to their portability feature, high detection efficiency, and large field of view. Lutetium-yttrium oxyorthosilicate (LYSO) is a widely used scintillator in gamma radiation detection. However, the structure and the arrangement of scintillators limit the sensitivity and detection accuracy of these radiation detectors. In this study, a novel portable sensor based on a monolithic LYSO ring was d...
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#1Weijie TaoH-Index: 3
#2Fenghua WengH-Index: 5
Last. Qiyu PengH-Index: 9
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#1Xie Qiangqiang (HUST: Huazhong University of Science and Technology)H-Index: 1
#2Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 7
Last. Jianfeng Xu (HUST: Huazhong University of Science and Technology)H-Index: 13
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Radiation monitoring has become critical nowadays when nuclear energy is more and more widely used. we hope to locate the radiation source with a time-saving detection equipment when a radiation leakage occurs. And the portability of radiation detection equipment will greatly restrict the efficiency of radiation detection. We propose a new type of radiation detection equipment and use GATE simulation to evaluate its performance. The simulation results show that this novel radiation detector is c...
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#1Wei Jiao (HUST: Huazhong University of Science and Technology)
#2Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 7
Last. Qiyu PengH-Index: 9
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PET detector is composed of scintillation crystal and optical sensor. The optical sensor receives the photons passing through the scintillation crystal. In order to improve the light output of the photonic crystal, we adopt the method of processing microstructure on the crystal surface to improve the transmittance of the photonic crystal. With the wide application of femtosecond laser in micro / nano machining, we studied the possibility of fabricating microstructure and improving the optical ou...
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#1Jingwei Yang (HUST: Huazhong University of Science and Technology)
#2Xie Qiangqiang (HUST: Huazhong University of Science and Technology)H-Index: 1
Last. Siwei XieH-Index: 5
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Discrete crystal scintillator arrays are widely used in preclinical PET. The crystal size determines the spatial resolution of PET systems. We simulated and evaluated two preclinical PET systems consisting of a monolithic ring based on previous study(MSR) in GATE with different readout methods: Dual-ended readout and Inner-surface readout. The Center-of-Gravity method and neural network algorithm were used to decode interaction positions of single photons and performances of both PET systems wer...
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#1Xi Zhang (HUST: Huazhong University of Science and Technology)H-Index: 3
#2Baihezi Ye (HUST: Huazhong University of Science and Technology)H-Index: 1
Last. Qiyu PengH-Index: 9
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The purpose of this study is to develop a PET detector with a 0.5 mm crystal size for high-resolution preclinical PET imaging. The methods to improve the decoding performances of the detectors, including the wedge-shaped light guides with different thicknesses, different methods to suppress the dark count noises in the SiPMs and different methods to calculate the flood maps, were investigated. The experimental results show that the PET detector developed in this study achieved an extraordinary d...
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#1Weijie Tao (SJTU: Shanghai Jiao Tong University)H-Index: 3
#2Fenghua Weng (SJTU: Shanghai Jiao Tong University)H-Index: 5
Last. Qiyu Peng (LBNL: Lawrence Berkeley National Laboratory)H-Index: 9
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A practical wearable brain PET scanner capable of dynamic neuroimaging during free bodily movement will enable potential breakthrough basic neuroscience studies and help develop imaging-based neurological diagnoses and treatments. Weight, brain coverage, and sensitivity are three fundamental technical obstacles in the development of Fully Wearable High-Performance (FWHP) brain PET scanners. The purpose of this study is to investigate the feasibility of building a FWHP brain PET using a limited v...
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#1Song Zhipeng (HUST: Huazhong University of Science and Technology)H-Index: 1
#2Zhao Zhixiang (SJTU: Shanghai Jiao Tong University)H-Index: 8
Last. Qiyu Peng (LBNL: Lawrence Berkeley National Laboratory)H-Index: 9
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This paper presented a non-uniform multiphase (NUMP) time-to-digital converter (TDC) implemented in a field-programmable gate array (FPGA) with real-time automatic temperature compensation. NUMP-TDC is a novel, low-cost, high-performance TDC that has achieved an excellent performance in Altera Cyclone V FPGA. The root mean square (RMS) for the intrinsic timing resolution was 2.3 ps. However, the propagation delays in the delay chain of some FPGAs (for example, the Altera Cyclone 10 LP) vary sign...
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