2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)最新文献_第10页

Studies of Cd-vacancies, indium dopant and impurities in CdZnTe crystals (Zn = 10%) CdZnTe晶体(Zn = 10%)中cd空位、铟掺杂物及杂质的研究

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352620

Longxia Li, F. Lu, Chun Lee, Honglin Ding, Wangchang Zhang, W. Yao, R. James, R. Olsen, A. Burger, G. Wright, D. Rhiger, K. Shah, M. Squillante, L. Cirignano, Hadong Kim, V. Ivanov, P. Luke

{"title":"Studies of Cd-vacancies, indium dopant and impurities in CdZnTe crystals (Zn = 10%)","authors":"Longxia Li, F. Lu, Chun Lee, Honglin Ding, Wangchang Zhang, W. Yao, R. James, R. Olsen, A. Burger, G. Wright, D. Rhiger, K. Shah, M. Squillante, L. Cirignano, Hadong Kim, V. Ivanov, P. Luke","doi":"10.1109/NSSMIC.2003.1352620","DOIUrl":"https://doi.org/10.1109/NSSMIC.2003.1352620","url":null,"abstract":"Using modified vertical Bridgman and a seeded technique, 3-inch-diameter CdZnTe (CZT) ingots were successfully grown with 40% of the ingots having single-crystal volumes of over 300 cm/sup 3/, and 80% of the ingots with single-crystal volumes of over 100 cm/sup 3/. High-yield growth of CZT crystals with these dimensions enables the production of novel monolithic, multi-element detectors. Defects such as Cd-vacancies, indium dopant and impurities were studied systematically. The studies show that by appropriately reducing the Cd-vacancy and the Group III dopant, one can increase the /spl mu//spl tau/(e) and /spl mu//spl tau/(h) products. Furthermore, the indium doping and the purity of the CZT were found to limit the value of the /spl mu//spl tau/(e) product. The \"best\" purity source material coupled with an optimized indium doping concentration will produce /spl mu//spl tau/(e) products as high as 1.8x10/sup -2/ cm/sup 2//V (collimated and the \"best\" area), and the best /spl mu//spl tau/(h) is 7x10/sup -4/ cm/sup 2//V.","PeriodicalId":186175,"journal":{"name":"2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)","volume":"20 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132968870","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

Atlas monitored drift tube long-term stability and aging study performed for the first time with the gas-recirculation system planned for LHC Atlas首次在LHC的气体再循环系统中监测了漂移管的长期稳定性和老化情况

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352713

S. Zimmermann, C. Cernoch

引用次数: 1

Aperture weighted cardiac cone-beam reconstruction using retrospective ECG gating 采用回顾性心电门控的孔径加权心脏锥束重建

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352458

P. Koken, R. Manzke, M. Grass

引用次数: 1

Investigation of signal readout methods for the Hamamatsu R8500 flat panel PSPMT 滨松R8500平板PSPMT信号读出方法的研究

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352390

S. Riboldi, J. Seidel, M. Green, J. Monaldo, J. Kakareka, T. Pohida

{"title":"Investigation of signal readout methods for the Hamamatsu R8500 flat panel PSPMT","authors":"S. Riboldi, J. Seidel, M. Green, J. Monaldo, J. Kakareka, T. Pohida","doi":"10.1109/NSSMIC.2003.1352390","DOIUrl":"https://doi.org/10.1109/NSSMIC.2003.1352390","url":null,"abstract":"Pulse processing efficiency is among the most important parameters to maximize when designing effective systems for positron emission tomography (PET) applications. As the activity of the positron source increases, the attainable processing efficiency is often limited by the increased probability of pulse pileup. Various techniques have been proposed to read out position-sensitive multiwire or multianode photomultiplier tubes (PSPMTs) that trade resistance to pulse-pileup against the simplicity (and cost) of the readout method. Light spreading onto the detector surface also affects the choice of readout method for multianode tubes. Four methods for readout of signals are compared for the H8500 Hamamatsu multianode PSPMT. The first combines signals from the entire device surface; the second scheme implements readout of signals from four separate quadrants. The third scheme, proposed by Majewski et al., is based on row and column readout. We propose a fourth, and new, readout scheme based on a geometrical arrangement of overlapping square sectors. We show that this solution reduces pulse pileup yet requires a relatively small number of output signal lines to determine the energy and position of each scintillation event.","PeriodicalId":186175,"journal":{"name":"2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125449012","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

Calibration procedure for a DOI detector of high resolution PET through mixture Gaussian model 基于混合高斯模型的高分辨率PET DOI探测器标定程序

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352398

E. Yoshida, Y. Kimura, K. Kitamura, H. Murayama

引用次数: 5

A robust and versatile method for the quantification of myocardial infarct size 一种稳健和通用的定量心肌梗死面积的方法

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352446

K. Dixon, L.N. Baldwin, B. Coquinco, E. Vandervoort, A. Fung, A. Celler

{"title":"A robust and versatile method for the quantification of myocardial infarct size","authors":"K. Dixon, L.N. Baldwin, B. Coquinco, E. Vandervoort, A. Fung, A. Celler","doi":"10.1109/NSSMIC.2003.1352446","DOIUrl":"https://doi.org/10.1109/NSSMIC.2003.1352446","url":null,"abstract":"In order to determine the size of myocardial perfusion infarcts in clinical SPECT images, we have developed a software package iQuant that eliminates the need for a normal-heart database - a problem that exists in commercial products. Details of the iQuant method are presented in this paper together with results from preliminary tests of accuracy and reproducibility. iQuant uses different count thresholds to define viable myocardial tissue and to provide a rough outline of the complete myocardium. This outline together with the visible thickness of the viable myocardium is used by the operator as a guide to determine the location and size of infarcted tissue. Using noiseless data iQuant is shown to be accurate to within 5%; with more clinically realistic simulated data the measured accuracy is 14%. When testing reproducibility, independent operators consistently produced results within 10% of the truth. Clinical experience was shown to be an important factor in the reproducible accuracy of each individual observer. Measurements to date only involve infarcts considered clinically small, but further work is planned to investigate the reliability of this method over a large range of infarct sizes and locations. Initial analysis shows the iQuant software to be an objective, robust and versatile tool suitable for the determination of myocardial perfusion infarct size in the clinical research environment. Its elimination of the need for a normal-heart database is its main advantages over current, commercially availably software.","PeriodicalId":186175,"journal":{"name":"2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120967135","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

Reconstruction for proton computed tomography: a Monte Carlo study 质子计算机断层重建:蒙特卡罗研究

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352460

T. Li, Z. Liang, K. Mueller, J. Heimann, L. Johnson, H. Sadrozinski, A. Seiden, David C Williams, L. Zhang, S. Peggs, T. Satogata, V. Bashkirov, R. Schulte

引用次数: 11

Development of a pixellated germanium Compton camera for nuclear medicine 核医学用像素化锗康普顿照相机的研制

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352707

G. Royle, R. Speller, P. Sellin, J. Gabathuse, W. Ghoggali

{"title":"Development of a pixellated germanium Compton camera for nuclear medicine","authors":"G. Royle, R. Speller, P. Sellin, J. Gabathuse, W. Ghoggali","doi":"10.1109/NSSMIC.2003.1352707","DOIUrl":"https://doi.org/10.1109/NSSMIC.2003.1352707","url":null,"abstract":"Work is underway to produce a clinical imaging system, based upon the Compton camera principle, to image positron emitters. The system has been designed by computer simulation to have a spatial resolution <1 cm at the patient and have good efficiency at 511 keV. An attempt has been made to make the camera reasonably portable. The camera was constructed by ORTEC. Controlling electronics based upon GRT4 electronics boards (Daresbury, UK) are employed. The camera comprises two pixellated germanium detector planes housed 9.6 cm apart in the same vacuum housing. The scattering detector is a pixellated germanium ring with an outer diameter of 10 cm, an inner diameter of 6 cm and a thickness of 0.4 cm. A total of 152 4/spl times/4 mm/sup 2/ pixels are distributed in 8 blocks around the ring. The absorbing detector is a pixellated germanium cylinder with a diameter of 2.8 cm and a thickness of 1 cm. A 5/spl times/5 block of 4/spl times/4 mm/sup 2/ pixels are implanted in the absorbing detector. Pulse timing information and induced charge in surrounding pixels is used to improve the intrinsic spatial resolution of the detectors to an expected value of /spl sim/1 mm. A mean energy resolution of 1.9 keV at 122 keV has been achieved, with a 0.2 keV standard deviation across the pixels. This paper will summarise the results to date and present the current state of camera developments.","PeriodicalId":186175,"journal":{"name":"2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122851618","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

Pragmatic image reconstruction for the MiCES Fully-3D mouse imaging PET scanner 实用的图像重建的mice全三维鼠标成像PET扫描仪

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352414

K. Lee, Paul Kinahan, J. Fessler, R. Miyaoka, T. Lewellen

{"title":"Pragmatic image reconstruction for the MiCES Fully-3D mouse imaging PET scanner","authors":"K. Lee, Paul Kinahan, J. Fessler, R. Miyaoka, T. Lewellen","doi":"10.1109/NSSMIC.2003.1352414","DOIUrl":"https://doi.org/10.1109/NSSMIC.2003.1352414","url":null,"abstract":"We present a pragmatic approach to image reconstruction for data from the MiCES fully-3D mouse imaging PET scanner under construction at the University of Washington. Our approach is modeled on fully-3D image reconstruction used in clinical PET scanners, which is based on Fourier rebinning (FORE) followed by 2D iterative image reconstruction. The use of iterative methods allows modeling the effects of statistical noise and attenuation etc., while FORE accelerates the reconstruction process by reducing the fully-3D data to a stacked set of independent 2D sinograms. Preliminary investigations have indicated that nonstationary detector point-spread response effects, which are ignored for clinical imaging, significantly impact image quality for the MiCES scanner geometry. To model the effect of nonstationary detector point spread response, we have added a factorized system matrix to the ASPIRE reconstruction library. The current implementation uses FORE+AWOSEM followed by postreconstruction 3D Gaussian smoothing. The results indicate that the proposed approach produces a dramatic improvement in resolution without undue increases in noise.","PeriodicalId":186175,"journal":{"name":"2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121644124","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: 16

Image reconstruction of motion corrected sinograms 运动校正正弦图的图像重建

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Pub Date : 2003-10-19 DOI: 10.1109/NSSMIC.2003.1352379

K. Thielemans, S. Mustafovic, L. Schnorr

引用次数: 59