2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)最新文献_第9页

Multi-threaded Geant4 on the Xeon-Phi with complex high-energy physics geometry Xeon-Phi处理器上的多线程Geant4，具有复杂的高能物理几何结构

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581868

S. Farrell, A. Dotti, M. Asai, P. Calafiura, Romain Monnard

引用次数: 3

A SiPM-based detection module for SPECT/MRI systems 基于sipm的SPECT/MRI系统检测模块

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582257

P. Busca, C. Fiorini, M. Occhipinti, P. Trigilio, K. Nagy, T. Bukki, M. Czeller, Z. Nyitrai, C. Piemonte, A. Ferri, A. Gola, J. Rieger

{"title":"A SiPM-based detection module for SPECT/MRI systems","authors":"P. Busca, C. Fiorini, M. Occhipinti, P. Trigilio, K. Nagy, T. Bukki, M. Czeller, Z. Nyitrai, C. Piemonte, A. Ferri, A. Gola, J. Rieger","doi":"10.1109/NSSMIC.2015.7582257","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582257","url":null,"abstract":"In the present work we present the development of a Silicon PhotoMultiplier (SiPM)-based detection module for hybrid SPECT/MRI instruments. The module is designed for preclinical SPECT systems for mouse and rat brain imaging, but can also be exploited for clinical SPECT brain scanners. The gamma-ray detection module is designed on the well-established Anger architecture, with a continuous 5 cm χ 5 cm CsI:Tl scintillator read by an array of SiPMs (RGB-HD with 25 μm SPAD cells) from Fondazione Bruno Kessler. The current signals are conveyed to a 36-channel ASIC realized in 0.35 μm CMOS technology and digitized by an external data acquisition system. An operative temperature of 0° C is mandatory to reduce the dark count rate of the SiPM array and to enhance the final performance of the detector in terms of energy and spatial resolution. For this purpose, an MRI-compatible heat sink is realized with a plastic material (Coolpolymer D5506) with a glycol-water mixture as cooling fluid. Gamma-ray measurements with Co-57 (122 keV) have provided an energy resolution better than 14% and an average intrinsic spatial resolution below 1.0 mm.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127266530","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: 4

Improvements in room temperature lifetime of pixelated TlBr detectors from surface etching 表面蚀刻对像素化TlBr探测器室温寿命的改善

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582270

S. O’Neal, W. Koehler, Zhong He, Hadong Kim, L. Cirignano, K. Shah, A. Conway, E. Swanberg, L. Voss, R. Graff, A. Nelson, S. Payne

{"title":"Improvements in room temperature lifetime of pixelated TlBr detectors from surface etching","authors":"S. O’Neal, W. Koehler, Zhong He, Hadong Kim, L. Cirignano, K. Shah, A. Conway, E. Swanberg, L. Voss, R. Graff, A. Nelson, S. Payne","doi":"10.1109/NSSMIC.2015.7582270","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582270","url":null,"abstract":"Due to its wide band gap (2.68 eV) and high stopping power, thallium bromide (TlBr) is being investigated as a room-temperature semiconductor gamma-ray spectrometer. When cooled to -20°C, performance of better than 1% FWHM at 662 keV has been observed on 5×5×5 mm3 pixelated TlBr detectors. The room-temperature lifetime (under continuous bias) of thick TlBr detectors operated at high fields (~2000 V/cm) has been limited to weeks or months due to polarization caused by ionic conduction. Previous work has shown that the degradation process is limited to the surface and that surface preparation techniques can extend the lifetime of thin planar TlBr devices at room temperature. In this work, the lifetime and stability of two large 5×5×5 mm3 pixelated TlBr arrays are presented. Detector performance is compared for different surface preparation techniques and improved stability is observed. Additionally, we use depth-sensing techniques to track the depth-dependent photopeak centroids over time and conclude that once surface degradation effects are mitigated, TlBr performance can improve over time at room temperature. The improvement is likely similar to conditioning at -20°C in which the electric field stabilizes and becomes more uniform.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127333966","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: 2

Data acquisition system to handle multiple experiments at the data rate of 12 Gbps at X-ray free-electron laser facility SACLA 在x射线自由电子激光设备SACLA中处理12 Gbps数据速率的多个实验的数据采集系统

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581241

M. Yamaga, T. Abe, Y. Furukawa, T. Hatsui, Y. Joti, T. Kameshima, T. Ohata, K. Okada, T. Sugimoto, R. Tanaka, M. Yabashi

引用次数: 0

Joint reconstruction of activity and attenuation using MR-based priors: Application to clinical TOF PET/MR 基于磁共振先验的关节活动和衰减重建:在临床TOF PET/MR中的应用

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582252

Sangtae Ahn, Lishui Cheng, D. Shanbhag, F. Wiesinger, R. Manjeshwar

引用次数: 6

Single photon time resolution with silicon photomultipliers using the STiC readout chip 单光子时间分辨率与硅光电倍增管使用STiC读出芯片

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581738

Y. Munwes, K. Briggl, Huangshan Chen, T. Harion, H. Schultz-Coulon, W. Shen, V. Stankova

{"title":"Single photon time resolution with silicon photomultipliers using the STiC readout chip","authors":"Y. Munwes, K. Briggl, Huangshan Chen, T. Harion, H. Schultz-Coulon, W. Shen, V. Stankova","doi":"10.1109/NSSMIC.2015.7581738","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581738","url":null,"abstract":"STiC3 is a mixed mode Application Specific Integrated Circuit (ASIC) for high resolution timing readout of Silicon Photomultipliers (SiPMs). It is designed for Time-ofFlight (ToF) applications in medical imaging and High Energy Physics experiments and has been developed in the framework of EndoToFPET-US project. The STiC3 chip uses the UMC 180 nm CMOS technology and has a differential structured front-end to reject common-mode noise. It has 64 channels and each channel consists of an analog front-end, a build-in TDC module and a digital part. In earlier measurements using 3.1×3.1×15 mm3 LYSO crystals and Hamamatsu S10362-33-050C MPPC sensors, a Coincidence Time Resolution (CTR) of ~214 ps FWHM has been obtain; the achieved energy resolution is ~12 % for 511 keV photons. In order to explore the timing performance for small signals a special setup has been established in our laboratory. The setup includes an optical system for automatically focusing a laser beam to a spot size smaller than 3 μm and allows to precisely evaluate the performance of the STiC3 chip as well as to carry out SiPMs characterization studies. A first measurement of the Single Photon Time Resolution (SPTR) using STiC3 is presented in this paper.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126954503","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: 4

Effects of SiPM multiplexing on timing performance SiPM复用对定时性能的影响

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582093

M. Bieniosek, J. Cates, C. Levin

{"title":"Effects of SiPM multiplexing on timing performance","authors":"M. Bieniosek, J. Cates, C. Levin","doi":"10.1109/NSSMIC.2015.7582093","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582093","url":null,"abstract":"Using time of flight (ToF) measurements for positron emission tomography (PET) is an attractive avenue for increasing the signal to noise (SNR) ratio of PET images. However, achieving fast timing resolution required for high SNR gain using silicon photomultipliers (SiPM) requires many resource heavy high speed readout channels. A method of multiplexing many SiPM signals into a single electronic channel would greatly simplify ToF PET readout systems. In this work the effect of multiplexing on the timing resolution of analog SiPMs is modeled, simulated and tested. The simulations and experiments show that baseline fluctuations from cumulative uncorrelated dark noise are the most important cause of timing degradation, but their effects can be mitigated with baseline correction. A charge sharing network for position sensitive multiplexing is proposed and tested. Results show a full width at half maximum (FWHM) coincidence timing resolution of 232 +/-2ps for single 3mm × 3mm × 20mm LYSO scintillation crystals with 16 SiPMs multiplexed to a single timing channel (in addition to 4 position channels). Measurements with a 4×4 array of 3mm × 3mm × 20mm LFS crystals show excellent crystal separation with a minimum ratio of distance between crystal peaks to standard deviation of crystal peaks of 11.9. The mean FWHM coincidence timing resolution of the 4×4 LFS array was 278 +/-7ps. All experiments were performed at room temperature with no thermal regulation. These results show that fast timing resolution for ToF can be achieved with highly multiplexed analog readout.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130627448","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: 2

Tests of CDs/DVDs as passive radon and thoron detectors for mines and caves cd / dvd作为矿井和洞穴被动氡和钍探测器的试验

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581964

D. Pressyanov, D. Dimitrov, S. Georgiev, I. Dimitrova

{"title":"Tests of CDs/DVDs as passive radon and thoron detectors for mines and caves","authors":"D. Pressyanov, D. Dimitrov, S. Georgiev, I. Dimitrova","doi":"10.1109/NSSMIC.2015.7581964","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581964","url":null,"abstract":"Radon (222Rn) exposure is evident health hazard in a substantial number of underground mines. Exposure to thoron (220Rn) is usually considered to be of secondary importance, but radiation data regarding 220Rn is very scarce compared to that for 222Rn. In planning area and personal monitoring in underground places (mines and caves) 220Rn issue should be addressed at least for two reasons: (1) to revise the possibility for increased exposure related to 220Rn; (2) To ensure that 222Rn results are not biased due to the sensitivity of detectors to 220Rn, as it was recently found for many commercial 222Rn detectors. In this report we test the applicability of CDs/DVDs as novel passive detectors for differential measurements of 222Rn and 220Rn in underground mines and caves. This is achieved by etching and counting alpha tracks at two different depths beneath the disk surface and analysis of the signals. To test the performance of the method and to check whether there is significant presence of thoron, 13 CDs were exposed in the underground galleries of a metal mine for 4 months. Results revealed that both 222Rn and 220Rn are present at the monitored places and in some cases the levels of 220Rn are higher than those of 222Rn. The CDs proved to be appropriate for measurements in the underground environment and stayed undamaged during the exposure. Additionally, dedicated laboratory experiments were made to test an approach to expand the range of 220Rn concentrations measurable at high 222Rn concentrations. The method proved its applicability for differential measurements of 222Rn and 220Rn over a wide range of concentrations. Radon concentrations well below the regulatory levels for workers are measurable even within 1 month exposure.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130688274","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: 1

Acceleration of image reconstruction with a ray-driven method using a GPGPU 基于GPGPU的射线驱动图像重建加速方法

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582047

R. Ito, K. Ogawa

引用次数: 1

A large area neutron detector array for the LET instrument at ISIS ISIS LET仪器的大面积中子探测器阵列

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581915

D. Raspino, N. Rhodes, E. Schooneveld

{"title":"A large area neutron detector array for the LET instrument at ISIS","authors":"D. Raspino, N. Rhodes, E. Schooneveld","doi":"10.1109/NSSMIC.2015.7581915","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581915","url":null,"abstract":"LET is a direct geometry cold neutron spectrometer at the ISIS spallation neutron source, working in the range between 0.5 and 30 meV (1.6 to 12.8 Å). The development and installation of a large area neutron detector array for LET has recently been completed. The detector array consists of 384 3He filled resistive wire tubes, 4 m long and 25.4 mm in diameter. The 3He pressure is 10 bars, to guarantee an efficiency above 90% for 1.6 Å neutrons, and 3 bars of argon are added as a stopping gas. The tubes are organized in twelve panels installed inside the LET vacuum tank that is operated at cryogenic vacuum. Here we will report about the rigorous assembly and test program of the detectors before their installation on the instrument and their performance on LET. The two main tasks in the assembly of the detectors were: aligning the support of the tubes with a precision better than 0.5 mm along the 4 m length of the tubes and guaranteeing the vacuum tightness for all the ~2000 vacuum feeds-through. We will outline the methods used to achieve these goals and the tests performed to check these requirements before the installation of the detectors on the instrument. Regarding the operation of these detectors on LET, we will describe the digitization and processing of the signals from the tubes. In particular we will focus the attention on how the signal processing is optimized to operate these detectors at high neutron rates whilst preserving other performances like gamma rejection and position resolution.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"2 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132968913","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: 1