2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)最新文献_第6页

Influence of design and process parameters on properties of edge-on silicon strip detector 设计参数和工艺参数对边沿式硅条探测器性能的影响

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008444

D. Vrtacnik, D. Resnik, U. Aljancic, M. Mozek, S. Amon

引用次数: 0

Medisoft 4: a software procedure for the control of the Medipix2 readout chip Medisoft 4:一个控制Medipix2读出芯片的软件程序

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009659

E. Bertolucci, M. Maiorino, G. Mettivier, M. C. Montesi, P. Russo

引用次数: 8

Development of a dual detector system based on a-Si:H arrays and multi-element silicon detectors for diffraction enhanced breast imaging 基于a- si:H阵列和多元素硅探测器的双探测器系统的开发用于衍射增强乳房成像

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008435

D. Darambara, R. Speller, P. Sellin

引用次数: 5

The BaBar RadFET monitoring board BaBar RadFET监控板

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009296

B. Camanzi, H. Crawley, A. Holmes-Siedle, R. Mckay, A. Mckemey, W. Meyer, E. Rosenberg, J. Stelzer, J. Tinslay

引用次数: 12

Study of GaAs detectors characteristics for medical imaging 医学成像用砷化镓探测器特性研究

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009287

S. Amendolia, M. G. Bisogni, A. Cola, P. Delogu, G. Dipasquale, M. Fantacci, M. Novelli, P. Oliva, F. Quaranta, M. Quattrocchi, V. Rosso, A. Stefanini, L. Vasanelli, S. Zucca

{"title":"Study of GaAs detectors characteristics for medical imaging","authors":"S. Amendolia, M. G. Bisogni, A. Cola, P. Delogu, G. Dipasquale, M. Fantacci, M. Novelli, P. Oliva, F. Quaranta, M. Quattrocchi, V. Rosso, A. Stefanini, L. Vasanelli, S. Zucca","doi":"10.1109/NSSMIC.2001.1009287","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009287","url":null,"abstract":"In this work we present the results of a systematic study about SI GaAs detectors as a function of substrate and contact type, geometry and thickness. This study has been stimulated from the interest in using GaAs as a detector for medical imaging applications. GaAs detectors have been produced using crystals grown with different techniques and changing both the thickness (in the range 200 /spl mu/m-1 mm) and the contacts type and geometry. We have measured the current-voltage characteristics and, using radioactive sources (/sup 109/Cd, 20 keV photons, /sup 241/Am, 60 keV photons, /sup 99m/Tc, 140 keV photons), we have studied the performance of our detectors in terms of charge collection efficiency and energy resolution as a function of the bias voltage. Besides we have also studied the electrical and spectroscopic properties of GaAs detectors with different types and concentrations of the dopants in the substrate. So we have found the optimal doping type and concentration to have the best spectroscopic performances and the higher breakdown voltage. Simulation programs made with Monte Carlo methods have been developed to describe the electric field distribution and the transport of charge carriers toward the electrodes in GaAs detectors. In these simulations we have considered the presence of deep energy levels in the bandgap, the thickness, the bias voltage and the charge deposition in the crystal after photon interaction.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134237852","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

Real-time event stream correction for patient motion in clinical 3-D PET 临床三维PET中患者运动的实时事件流校正

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009230

W. Jones

{"title":"Real-time event stream correction for patient motion in clinical 3-D PET","authors":"W. Jones","doi":"10.1109/NSSMIC.2001.1009230","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009230","url":null,"abstract":"Stationary phantoms are typically used to demonstrate intrinsic image resolution in PET. Yet, real image resolution in most clinical PET studies degrades by a reported factor of 3 to 5 due to unintentional patient motion. Motion tracking instruments are available (Polaris from NDI) to measure complex 3-D and 6-D movements in real time. Still, clinical sites demand high patient throughput. Time available for post-acquisition data processing is limited. This article presents an architectural concept for on-line PET data acquisition systems that deliver the benefits of motion correction consistent with high patient throughput. Such systems provide real-time processing for coincidence-by-coincidence correction of patient motions. For this concept, five processing stages are described. Each stage feeds the next with 64-bit (or larger) coincidence event packets and operates continuously at up to 10M events/sec or faster. Stage 1 incorporates an event correction factor (ECF) into each incoming detector-pair packet. For example, each 16-bit block-floating ECF corrects for normalization, dead time, etc. and is used later in Stage 5. Stage 2 converts detector-pair content of the packets into xyz-pair content-effectively changing each scintillator element index into a stationary 3-D coordinate index. Each x, y and z value is a 12-bit signed integer. Stage 3 transforms xyz pairs into x'y'z' pairs by application of motion tracking data. Each x'y'z' 3-D coordinate system remains fixed relative to the indicated portion of the patient body-e.g. chest, pelvis, head, etc. Stage 4 converts x'y'z'-pair packets into bin-address packets. The 37-bit bin address references unique elements (32-bit bins) in the projection array. Stage 5 performs weighted histogramming in which the ECF value-carried along with each packet from Stage 1-is added to (subtracted from) the indicated bin value for each prompt (delayed) event.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127586985","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: 18

A silicon telescope for nanodosimetry in biomedical applications 用于生物医学纳米剂量测定的硅望远镜

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009721

B. Keeney, V. Bashkirov, R. Johnson, W. Kroeger, H. Oyama, H. Sadrozinski, R. Schulte, A. Seiden, P. Spradlin

引用次数: 0

Converging slat collimators for hybrid PET 用于混合PET的会聚板准直器

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009741

D. Kadrmas, T. Rust

{"title":"Converging slat collimators for hybrid PET","authors":"D. Kadrmas, T. Rust","doi":"10.1109/NSSMIC.2001.1009741","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009741","url":null,"abstract":"Hybrid PET cameras have a number of hardware compromises that degrade image quality relative to dedicated PET. Such degradation is primarily caused by poor detection efficiency given by Nal scintillation crystals, limited count-rate culpabilities, multi-head as opposed to full-ring camera geometry, and so on. The count-rate limitation is exacerbated by the relatively large axial field-of-view (FOV) offered by most hybrid gamma cameras. In order to fully utilize the available count-rate, It is necessary to shield its many singles and scattered events as possible so that the camera can process the maximum number of true coincidence events. A common approach is to use axial collimators with parallel slats to shield out-of-FOV photons. Such collimators also greatly reduce the number of scattered events. We are investigating converging slat collimators, which may be better able to shield out-of-FOV photons while greatly increasing sensitivity to the central FOV. Such collimators create a pseudo-3D imaging geometry, maintain good shielding of scattered events, and may greatly improve volume-of-interest imaging performance. The GEANT Monte Carlo program (CERN) was used to simulate a variety of parallel and convergent slat collimators. Both lead and tungsten septa were studied. Axially-focused slat collimators were found to provide greatly increased sensitivity to the central FOV while also providing better shielding to out-of-FOV photons. Whole-body NEC performance for fan slat collimators was nearly identical to that for conventional parallel slat collimators, and volume-of-interest NEC was nearly doubled using fan slat collimators.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132801944","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

Digital pulse shape algorithms for scintillation-based neutron detectors 基于闪烁的中子探测器数字脉冲形状算法

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009682

S. Jastaniah, P. Sellin

引用次数: 37

Scintillator and photodetectors comparison for compact gamma cameras 小型伽玛照相机的闪烁体和光电探测器比较

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008571

F. Garibaldi, F. Cusanno, G. Urciuoli, E. Cisbani, R. Pani, A. Soluri, R. Pellegrini, R. Scafè, M. Cinti, G. Trotta

引用次数: 1