发布求助
文献互助 智能选刊 最新文献

2002 IEEE Nuclear Science Symposium Conference Record最新文献

筛选
英文 中文
Modeling of a resistive straw tracking chamber and its second coordinate readout 电阻式吸管跟踪室的建模及其二次坐标读出
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239291
Yonggang Cui, K. Lan, E. Hungerford
{"title":"Modeling of a resistive straw tracking chamber and its second coordinate readout","authors":"Yonggang Cui, K. Lan, E. Hungerford","doi":"10.1109/NSSMIC.2002.1239291","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239291","url":null,"abstract":"Test results of two straw prototype detectors, constructed to calibrate a computer model of a straw detector system with two-dimensional readout, are reported in this paper. The computer model is then used to study the properties of a straw detector system such as the charge induced on an external conductive strip, the impedance of the signal readout, and the cross talk between adjacent straws. These results are being used to aid the design of the tracking system for the MECO experiment.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130709668","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: 3
Pulse shape simulation and analysis of segmented Ge detectors for position extraction 用于位置提取的分段锗探测器脉冲形状仿真与分析
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239335
M. Kurokawa, S. Shimoura, H. Iwasaki, Hidetada Baba, S. Michimasa, S. Ota, Hiroyuki Murakami, Hideyuki Sakai
{"title":"Pulse shape simulation and analysis of segmented Ge detectors for position extraction","authors":"M. Kurokawa, S. Shimoura, H. Iwasaki, Hidetada Baba, S. Michimasa, S. Ota, Hiroyuki Murakami, Hideyuki Sakai","doi":"10.1109/NSSMIC.2002.1239335","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239335","url":null,"abstract":"A simulation method, which can predict the relation between the pulse shapes and the interacting points of incident /spl gamma/-rays, has been established for the entire effective volume of the detector, and its accuracy was experimentally confirmed. Based on the simulated results, the method of pulse shape analysis for the extraction of the position information and the expected resolution are discussed.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131255886","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: 13
High spatial resolution detector using an 8/spl times/8 MLS crystal array and a quad anode photomultiplier 高空间分辨率探测器采用8/spl倍/8 MLS晶体阵列和四阳极光电倍增管
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239644
C.L. Kim, D. McDaniel
{"title":"High spatial resolution detector using an 8/spl times/8 MLS crystal array and a quad anode photomultiplier","authors":"C.L. Kim, D. McDaniel","doi":"10.1109/NSSMIC.2002.1239644","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239644","url":null,"abstract":"A compact and high position resolution detector for whole body PET has been developed using an 8/spl times/8 MLS scintillation crystal array and a quad-anode photomultiplier. The scintillation crystal block consists of 64 single crystals with dimensions of 4.67/spl times/4.67/spl times/30mm/sup 3/. Light sharing is controlled through the finishes of the crystal surfaces, Teflon reflective layers and a simple thin light guide. The block properties have been characterized using 511 keV gamma rays using Ge/sup 68/. Peaks in the crystal decoding map are well isolated with an average peak-to-valley ratio of 3.17. An energy resolution of 15% FWHM and a timing resolution of 1.2 ns FWHM were obtained.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133283540","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
3D image reconstruction of CT-data using the ITEM algorithm 利用ITEM算法对ct数据进行三维图像重建
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239493
J. Durst, J. Pauli, G. Anton
{"title":"3D image reconstruction of CT-data using the ITEM algorithm","authors":"J. Durst, J. Pauli, G. Anton","doi":"10.1109/NSSMIC.2002.1239493","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239493","url":null,"abstract":"ITEM (Imaginary Time Expectation Maximization) is a general minimization technique based on quantum-mechanical (QM)-methods. It has already proven to be a useful method for image reconstruction . ITEM is a fast (compared to other statistical methods) and intrinsically 3D-friendly (for its low demands on memory) algorithm. Therefore it is a good candidate for a reconstruction method for computed-tomography (CT)-data. Being a statistical method, it is possible with ITEM to model the underlying physics of the imaging system better than with an analytical backprojection method like filtered backprojection (FB) and so that better images with the same data set can be obtained. Two implementations of ITEM for CT-data and the resulting images achieved with both methods are presented. Finally the results are compared with standard (FB) techniques. ITEM (algorithm as well as all of its implementations) is published under the terms of GNU/GPL.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"15 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132137899","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
LaBr/sub 3/:Ce scintillators for gamma ray spectroscopy LaBr/ sub3 /:用于伽马射线光谱的Ce闪烁体
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239275
Kanai S. Shah, J. Glodo, M. Klugerman, W. W. Moses, S. E. Derenzo, M. Weber
{"title":"LaBr/sub 3/:Ce scintillators for gamma ray spectroscopy","authors":"Kanai S. Shah, J. Glodo, M. Klugerman, W. W. Moses, S. E. Derenzo, M. Weber","doi":"10.1109/NSSMIC.2002.1239275","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239275","url":null,"abstract":"In this paper, we report on a relatively new scintillator - LaBr/sub 3/ for gamma ray spectroscopy. Crystals of this scintillator have been grown using Bridgman process. This material when doped with cerium has high light output (/spl sim/60,000 photons/MeV) and fast principal decay constant (/spl les/25 ns). Furthermore, it shows excellent energy resolution for /spl gamma/-ray detection. Energy resolution of 3.2% (FWHM) has been achieved for 662 keV photons (/sup 137/Cs source) at room temperature. High timing resolution (260 ps FWHM) has been recorded with LaBr/sub 3/-PMT and BaF/sub 2/-PMT detectors operating in coincidence mode using 511 keV positron annihilation /spl gamma/-ray pairs. Details of its scintillation properties, and variation of these properties with changing cerium concentration are reported. Potential applications of this material are also addressed.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133230220","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: 73
A water calorimeter based on radiation-induced conductivity 一种基于辐射导电性的水量热计
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239264
T. Dombeck
{"title":"A water calorimeter based on radiation-induced conductivity","authors":"T. Dombeck","doi":"10.1109/NSSMIC.2002.1239264","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239264","url":null,"abstract":"A calorimeter is described that measures the delivered dosage of radiation by the induced electrical conductivity in water through the production of long-lived ions. The device is being developed for use in providing real-time measurements of beam losses in particle accelerators. It promises to be a simple, reliable and accurate device with a linear response from a few Grays up to a MegaGray with potential application in industry and medical clinics. A model of the physical processes that produce the long-lived ions; is presented in this paper and compared with the existing data. These ions have been implicated in the radiation lethality to living cells such that the water calorimeter might measure direct biological-equivalent dosage without recourse to intermediate protocols.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127404792","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
Simple cone beam backprojection reconstruction for robust skeletonization of 3D vascular trees 用于三维维管树鲁棒骨架化的简单锥梁反投影重建
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239492
C. C. Hanger, S. Haworth, R.C. Molthen, C. Dawson, R. Johnson
{"title":"Simple cone beam backprojection reconstruction for robust skeletonization of 3D vascular trees","authors":"C. C. Hanger, S. Haworth, R.C. Molthen, C. Dawson, R. Johnson","doi":"10.1109/NSSMIC.2002.1239492","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239492","url":null,"abstract":"We describe and demonstrate a semi-automated method for three-dimensional skeletonization of vascular trees in X-ray CT image volumes. The key to the method, which tracks the vessel midline in successive increments, is that estimates of midpoint coordinates at each point along the vessel are obtained from a local reconstruction of the orthogonal vessel cross section at that point. Unlike filtered backprojection reconstruction, which attempts to recover the uniform density of a contrast agent-filled vessel across the entire lumen, simple backprojection reconstruction results in the minimum intensity occurring at the center of gravity of the orthogonal cross section. Our method is shown to provide a robust, semi-automated means for skeletonization of complex vascular trees.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127408819","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
Scintillator energy and flux linearity for RbGd/sub 2/Br/sub 7/:Ce, LaCl/sub 3/:Ce, and LaBr/sub 3/:Ce RbGd/sub 2/Br/sub 7/:Ce、LaCl/sub 3/:Ce和LaBr/sub 3/:Ce的闪烁体能量和通量线性
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239477
W. Barber, K. Iwata, J. Glodo, M. Klugerman, A. Sakdinawat, B. Hasegawa, K. Shah
{"title":"Scintillator energy and flux linearity for RbGd/sub 2/Br/sub 7/:Ce, LaCl/sub 3/:Ce, and LaBr/sub 3/:Ce","authors":"W. Barber, K. Iwata, J. Glodo, M. Klugerman, A. Sakdinawat, B. Hasegawa, K. Shah","doi":"10.1109/NSSMIC.2002.1239477","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239477","url":null,"abstract":"The development of scintillator detectors made of dense ionic crystals with high light output and fast response times offers to improve radiation detection systems commonly employed in medical imaging. Three such cerium doped materials, rubidium gadolinium bromide (RbGd/sub 2/Br/sub 7/:Ce), lanthanum chloride (LaCl/sub 3/:Ce), and lanthanum bromide (LaBr/sub 3/:Ce) show promise as bright, fast scintillators with good energy resolution for gamma rays. To be useful as gamma-ray detectors for positron emission tomography (PET) and single photon emission computed tomography (SPECT) applications, the signal from these scintillators should have a linear energy response. To be useful as x-ray detectors in computed tomography (CT) applications, the output of these scintillators must be linear over a wide range of flux rates. We have therefor measured the response of these scintillators to different energy gamma-rays with a detector operated in pulse counting mode. We have also measured the range of linear response to diagnostic x-rays, of these materials, with a detector operated in current mode with a sigma-delta analog to digital converter (ADC). We find a linear energy response for all three materials from 60 keV to 662 keV. We find a linear x-ray flux response to five decades of flux for RbGd/sub 2/Br/sub 7/:Ce and four decades of flux for LaCl/sub 3/:Ce and LaBr/sub 3/:Ce. The current in the photodiode is proportional to the x-ray flux in the scintillators provided that direct interactions between x-rays and the photodiode are subtracted. This is accomplished by measuring the photodiode current with and without optical opaque tape between the scintillator and photodiode. Coupling dense scintillators to radiation hard solid state detectors may allow for configurations useful for both low flux gamma-ray and high flux x-ray detection which could improve dual-modality imaging techniques such as combined CT/SPECT and CT/PET.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115593350","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
Effects of inter-crystal cross-talk on multi-element LSO/APD PET detectors 晶体间串扰对多元素LSO/APD PET探测器的影响
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239639
P. Vaska, S. Stoll, C. Woody, D. Schlyer, S. Shokouhi
{"title":"Effects of inter-crystal cross-talk on multi-element LSO/APD PET detectors","authors":"P. Vaska, S. Stoll, C. Woody, D. Schlyer, S. Shokouhi","doi":"10.1109/NSSMIC.2002.1239639","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239639","url":null,"abstract":"One of the most promising high resolution PET detector designs comprises an array of small, optically isolated scintillator crystals each coupled to an independent photosensor, such as an avalanche photodiode (APD). However, cross-talk between crystals (due to Compton scatter, photoelectron escape, or incomplete optical isolation) can significantly degrade performance, and is expected to increase as crystals become narrower to improve spatial resolution. Various measures of cross-talk have been determined for different configurations of 4x8 blocks of 2 mm /spl times/ 2 mm lutetium oxyorthosilicate (LSO) crystals coupled to matched Hamamatsu APD arrays. Results indicate that ignoring crosstalk signals could lead to a /spl sim/30% loss in coincidence sensitivity for a tomograph using these detectors, and a decrease in energy resolution of /spl sim/2 percentage points. Spatial and time resolution would not be significantly affected with most practical front-end architectures.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114471907","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: 10
Portable gamma-ray monitor composed of a compact electrically cooled Ge detector and a mini-MCA system 便携式伽玛射线监测仪，由一个紧凑的电冷却锗探测器和一个微型伽玛射线系统组成
2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239361
M. Katagiri, A. Birumachi, K. Sakasai, K. Takahashi
{"title":"Portable gamma-ray monitor composed of a compact electrically cooled Ge detector and a mini-MCA system","authors":"M. Katagiri, A. Birumachi, K. Sakasai, K. Takahashi","doi":"10.1109/NSSMIC.2002.1239361","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239361","url":null,"abstract":"A portable gamma-ray monitor composed of a compact electrically cooled germanium detector and a mini-MCA system was developed for in-situ gamma-ray monitoring with very fast starting time and easy operation. This detector may be used mainly in an accident, an emergency, a fast inspection and an easy analysis because the starting time of the Ge detector is 51 minute. The size of Ge detector is 10.2cm/spl phi/ /spl times/ 39.3cm and the weight 5.2kg. A small Stirling refrigerator can cool down a 14cm/sup 3/ planar-type high purity Ge detector with the relative detection efficiency of 1% automatically with a low consuming driving power supply. After cool down, coming gamma rays are measured and analyzed repeatedly by a mini-MCA system with a very small hand held computer. The energy resolution of the detector is 2.46 keV at gamma ray of 1.33MeV. Consequently, a user can comfortably analyze gamma-rays spectrum with decision of the nuclide and its quantitative analysis by watching the display on the hand held computer.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114617310","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信