2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)最新文献_第6页

Discrete iterative algorithms for scatter-to-attenuation reconstruction in PET PET散射衰减重建的离散迭代算法

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069455

Yannick Berker, V. Schulz, J. Karp

{"title":"Discrete iterative algorithms for scatter-to-attenuation reconstruction in PET","authors":"Yannick Berker, V. Schulz, J. Karp","doi":"10.1109/NSSMIC.2016.8069455","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069455","url":null,"abstract":"Recently, several groups have proposed the use of scattered coincidences in positron emission tomography (PET), aiming at improved attenuation correction using the PET emission data, e.g., in PET-MRI. In this work, we analyzed the behavior of several algorithms, including reconstruction by two-branch scatter-to-attenuation back-projection (BP) and maximum likelihood expectation maximization with a one-step-late update of the system matrix (MLEM-OSL). A maximum-likelihood gradient-ascent (MLGA) approach, as previously proposed by us, was tested with four step sizes and several stabilization and acceleration techniques (Armijo step size rule, conjugate gradients, Nesterov acceleration, and subsets). The convergence speed of all algorithms was compared using phantom simulations in fields of view (FOVs) ranging from rat-sized to human-sized. For MLEM-OSL, based on a numerical criterion distinguishing low- and high-attenuation surfaces of response (SOR), the most useful (low-attenuation) SORs were isolated in order to improve convergence speed. We found that the Armijo step size rule improved convergence speed and enabled the use of conjugate gradients, further improving convergence rates. Alternatively, the use of data subsets yielded near-ideal speed-up of MLGA. Even with identical geometries (up to a spatial scale factor), performance of all algorithms depends on the FOV size, suggesting a new kind of scale problem. In particular, shortcomings of MLEM-OSL prevent convergence to the true solution in large FOVs, where MLGA behaves more favorably. Convergence rates of MLEM-OSL were improved by removing high-attenuation SORs, indicating that, opposing intuition, MLEM-OSL convergence can be improved by using less data.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124339476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Pitfalls in MLAA and MLACF MLAA和MLACF的缺陷

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069555

K. Salvo, M. Defrise

引用次数: 2

Performance of the LBNL FastCCD for the European XFEL 用于欧洲XFEL的LBNL快速ccd的性能

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069829

F. Januschek, Ivana Klačkov, N. Andresen, P. Denes, S. Hauf, J. Joseph, M. Kuster, C. Tindall

引用次数: 6

A combination of multiple channels of FPGA based time-to-digital converter for high time precision 一种基于FPGA多通道组合的时间-数字转换器，具有较高的时间精度

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069649

Qiang Cao, Yonggang Wang, Chong Liu

引用次数: 2

Optimization of a fast neutron scintillator for real-time pulse shape discrimination in the transient reactor test facility (TREAT) hodoscope 快中子闪烁体在瞬态反应堆试验装置(TREAT)反射镜中实时脉冲形状识别的优化

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069782

James T. Johnson, S. Thompson, S. Watson, D. Chichester

引用次数: 4

Real-time track reconstruction during readout using an artificial retina architecture 在读取过程中使用人工视网膜结构进行实时轨迹重建

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069933

F. Bedeschi, R. Cenci, P. Marino, M. Morello, G. Punzi, L. Ristori, F. Spinella, S. Stracka, J. Walsh

{"title":"Real-time track reconstruction during readout using an artificial retina architecture","authors":"F. Bedeschi, R. Cenci, P. Marino, M. Morello, G. Punzi, L. Ristori, F. Spinella, S. Stracka, J. Walsh","doi":"10.1109/NSSMIC.2016.8069933","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069933","url":null,"abstract":"We present the results of a study of the feasibility of implementing real-time track reconstruction within the framework of a pre-existing readout system, using the “Artificial Retina” approach. This is the first attempt at building a complete medium-size prototype of this kind (comprising about 8M Logic Elements, distributed on several separate boards), operating it continuously at its limit speed. This study emphasizes logic architecture, correct operation, size, and compatibility with a standard readout framework, to explore its useability as an add-on to a conventional readout system. For this reason we have chosen for implementation a moderate-cost, moderate-speed board already in use in the data acquisition of an existing HEP experiment. Our choice fell on the readout boards currently in use by the NA62 experiment (TEL62), each equipped with 5 Altera Stratix III FPGAs and 4 Gbit/s ethernet interface. We have reprogrammed the board firmware in two different ways, to make the boards behave as the two main blocks of a AR system (switch system, and cellular processor farm). They are interfaced via the front panel, inverting their normal data flow path, by custom interconnection boards, and devoped in internal sytem for continuous feeding of data in order to test them at their maximum achievable speed. We report the results of extensive tests perfomed with this prototype, and discuss their implications regarding the applicability of the “retina architecture” to faster, and custom-developed real-time processors.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126477804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Minimization of the impact of sensor velocity on the probability of source detection using geographically weighted methods 使用地理加权方法最小化传感器速度对源探测概率的影响

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069703

Myeong-Hun Jeong, C. Sullivan, Michael Cheng, Shaowen Wang

引用次数: 2

Evaluation of a bread board model gamma-ray burst polarimeter toward installation on the international space station 面向国际空间站安装的面包板型伽玛暴偏振计的评估

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069641

Yuma Oikawa, S. Gunji, T. Nakamori, M. Takakura, T. Ueda, Tatsuya Kishikawa, S. Daigle, J. Gaskin, B. Ramsey, C. Wilson-Hodge, R. Preece, M. McConnell, P. Bloser, J. Legere, D. Yonetoku, T. Mihara, K. Hayashida, Y. Kishimoto, S. Kishimoto, H. Takahashi, Y. Yatsu, K. Toma, T. Sakamoto

{"title":"Evaluation of a bread board model gamma-ray burst polarimeter toward installation on the international space station","authors":"Yuma Oikawa, S. Gunji, T. Nakamori, M. Takakura, T. Ueda, Tatsuya Kishikawa, S. Daigle, J. Gaskin, B. Ramsey, C. Wilson-Hodge, R. Preece, M. McConnell, P. Bloser, J. Legere, D. Yonetoku, T. Mihara, K. Hayashida, Y. Kishimoto, S. Kishimoto, H. Takahashi, Y. Yatsu, K. Toma, T. Sakamoto","doi":"10.1109/NSSMIC.2016.8069641","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069641","url":null,"abstract":"To elucidate the radiation mechanism of gamma ray bursts, we are developing the polarimeter which consists of segmented plastic scintillators and GAGG(Ce) scintillators attached with multi-anode photomultipliers and avalanche photodiodes, respectively. Constructing the bread board model with 36 pieces of plastic scintillator and 24 pieces of GAGG(Ce) scintillator, we have carried out the beam experiments at the KEK Photon Factory in Japan. At the same time, we carried out also computer simulation and we compared the experimental data with results of simulations. As the results, it was recognized that the modulation factor by the experiments is consistent with that by the simulations. On the other hand, though the detection efficiency obtained by the experiments is in rough agreement with that by the simulation, the value of the detection efficiency can not be well explained reasonably. This discrepancy is likely due to the incomplete energy calibration of the plastic scintillators.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131353260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of the fast and efficient gamma detector using cherenkov light 切伦科夫光快速高效伽马探测器的研制

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069926

C. Canot, O. Kochebina, M. Alokhina, P. Abbon, J. Bard, G. Tauzin, D. Yvon, Viatcheslav Sharyy

{"title":"Development of the fast and efficient gamma detector using cherenkov light","authors":"C. Canot, O. Kochebina, M. Alokhina, P. Abbon, J. Bard, G. Tauzin, D. Yvon, Viatcheslav Sharyy","doi":"10.1109/NSSMIC.2016.8069926","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069926","url":null,"abstract":"In this presentation we describe the development of a gamma detector using Cherenkov-only light. Such a device is foreseen for the detection of 511 keV photons from the positron annihilation and provides simultaneously the extremely high resolution in time and large efficiency. The main application of such a detector is the positron detection using the time-of-flight (TOF) technique, which plays an important role in the positron emission tomography (PET). It has an application in the material science for the positron annihilation lifetime spectroscopy technique and could be important for the particle identification in high energy physics. The gamma detector consists of a PbF2 crystal coupled to a micro-channelplate photo-multiplier (MCP-PMT). The ability to detect 511 keV photons by such crystal has been demonstrated, but detection efficiency is found to be rather small, less then 10% [1], due to the limited number of photons produced by the Cherenkov effect. The low efficiency is a major limiting factor for making very fast TOF PET devices. We propose an innovative solution to overtake this limitation and reach simultaneously resolution in time better than 100 ps (FWHM) and the detection efficiency of about 50%. We describe the results of the first test of a complete detector chain with radioactive positrons source 22Na.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132456203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Afterglow artifacts correction for ultra-fast tomography acquisition by synchrotron radiation 同步辐射超快速断层成像的余辉伪影校正

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) Pub Date : 2016-10-01 DOI: 10.1109/NSSMIC.2016.8069830

K. Z. Zefreh

引用次数: 1