2002 IEEE Nuclear Science Symposium Conference Record最新文献_第4页

Analytical reconstruction for multi-segment slant hole SPECT 多段斜孔SPECT的解析重建

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239543

G. Bal, G. L. Zeng, F. Noo, H. Bal, R. Clackdoyle

{"title":"Analytical reconstruction for multi-segment slant hole SPECT","authors":"G. Bal, G. L. Zeng, F. Noo, H. Bal, R. Clackdoyle","doi":"10.1109/NSSMIC.2002.1239543","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239543","url":null,"abstract":"In this paper, we present a 'fully 3D analytical reconstruction algorithm' derived for the 2D parallel X-ray projections, whose imaging geometry can be divided into a set of circular arcs. The derived algorithm was applied to a novel multisegment slant hole (MSSH) single photon emission computed tomography (SPECT) system (Bal et al 2002) developed in our lab. For MSSH SPECT the acquisition geometry can be represented as four circular arcs, on the unit sphere of projection directions, where the central two arcs overlap to form a semi great circle while the other two arcs are parallel to and separated by a from the central semi circle. This MSSH geometry represents an over-determined system and hence the 3D filtered backprojection (FBP) algorithm can have an infinite number of valid filters. Assuming all projections have similar noise levels, the optimal FBP filter is found by taking central sections through the inverse of the 3D transfer function of the backprojection process. We have followed this (usual) path to derive the FBP filter for our MSSH geometry. The new contribution is the intermediate results of the filter for an arbitrary circular arc on the unit sphere of less than 360/spl deg/. With our closed-form expression a large class of geometries can be constructed provided the geometry represents a collection of circular (partial) arcs. We have implemented the MSSH filter and run idealized simulations as well as physical phantom studies to verify the 3D FBP filter.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"1 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":"128562724","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

The coincidence matrix ASIC of the level-1 muon barrel trigger of the ATLAS experiment ATLAS实验中一级介子桶触发器的重合矩阵ASIC

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239309

V. Bocci, E. Petrolo, A. Salamon, R. Vari, S. Veneziano

{"title":"The coincidence matrix ASIC of the level-1 muon barrel trigger of the ATLAS experiment","authors":"V. Bocci, E. Petrolo, A. Salamon, R. Vari, S. Veneziano","doi":"10.1109/NSSMIC.2002.1239309","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239309","url":null,"abstract":"The Atlas Barrel Level-1 muon trigger processes hit information from the Resistive Plate Chamber detector, identifying candidate muon tracks and assigning them to a programmable p/sub T/ range and to a unique bunch crossing number. The trigger system uses up to seven detector layers and looks for hit patterns compatible to muon tracks in the bending and non-bending projection. The basic principle of the algorithm is to require a coincidence of hits in the different chamber layers within a road. The width of the road is related to the p/sub T/ threshold to be applied. The system is split into an on-detector and an off-detector part. The on-detector electronics reduces the information from about 350k channels to about 400 32-bit data words sent via optical fibre to the so-called Sector Logic (SL). The off-detector SL electronics collects muon candidates and associates them to detector Regions-of-Interest of /spl Delta//spl eta/X/spl Delta//spl Phi/ of 0.1X0.1. The core of the on-detector electronics is the Coincidence Matrix ASIC (CMA), which fulfils both the trigger algorithm and the readout of the RPC detector. Each CMA is able to process and readout 192 RPC strips from up to four detector layers. In order to keep the full Level-1 system latency below 2 /spl mu/s, the CMA has to rind candidate muon tracks with a latency of a few 25 ns bunch crossing periods. The readout part of the CMA is able to time tag incoming RPC hits with a time interpolator running at the trigger pipeline frequency of 320 MHz and to send the data to the readout system via a serial link. The design of the trigger system and the performances of the ASIC, based on a CMOS 0.18 /spl mu/m technology, are presented.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"42 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":"129258801","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: 35

Construction of a fast laser-based calibration system for the Harp TOF counters wall 竖琴TOF计数器壁快速激光校准系统的构建

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239272

M. Bonesini, F. Ferri, P. Govoni, M. Paganoni, A. Parravicini, A. Tonazzo, A. Andreoni, M. Bondani, F. Paleari, A. Spinelli, D. Gibin, A. Guglielmi, A. Menegolli

引用次数: 5

A RICH multiplicity veto for the HERA-B experiment HERA-B实验的RICH多重性否决

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239302

U. Husemann, M. Adams, M. Boker, M. Bruggemann, C. Cruse, P. Buchholz, Y. Kolotaev

引用次数: 1

Automatic processing of multimodality data for functional PET analysis 功能PET分析多模态数据的自动处理

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239671

A. Crabb, Yun Zhou, O. Rousset, D. Wong

引用次数: 0

A metastable xenon isotope detector for treaty verification 用于条约核查的亚稳氙同位素探测器

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239337

J. Lopes, R. Morgado, C. Conde

引用次数: 4

Thallium lead iodide radiation detectors 碘化铊铅辐射探测器

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239360

K. Hitomi, T. Onodera, T. Shoji, Y. Hiratate

{"title":"Thallium lead iodide radiation detectors","authors":"K. Hitomi, T. Onodera, T. Shoji, Y. Hiratate","doi":"10.1109/NSSMIC.2002.1239360","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239360","url":null,"abstract":"Thallium lead iodide (TlPbI/sub 3/) is a compound semiconductor characterized with wide band gap (2.3 eV) and high photon stopping power. Thus, TlPbI/sub 3/ is an attractive material for fabrication of room temperature radiation detectors. In this study, TlPbI/sub 3/ crystals were grown by the vertical Bridgman technique using zone-purified materials. The starting materials for the crystal growth were synthesized from commercially available TlI and PbI/sub 2/ powders with nominal purity of 99.99%. Powder X-ray diffraction analysis was performed to evaluate chemical composition of the synthesized TlPbI/sub 3/. In order to fabricate radiation detectors, the grown crystals were cut into several wafers using a wire saw. The wafers were then polished using Al/sub 2/O/sub 3/ abrasives. Electrodes were formed on the wafers by vacuum evaporation of gold. The resultant TlPbI/sub 3/ radiation detectors were evaluated by measuring their current-voltage characteristics and spectral responses. Most of TlPbI/sub 3/ detectors exhibited resistivities more than 10/sup 11/ /spl Omega/cm. The TlPbI/sub 3/ detectors were irradiated with /spl alpha/-particles (5.48 MeV) from a /sup 241/Am source or /spl gamma/-rays (662 keV) from a /sup 137/Cs source. The TlPbI/sub 3/ detectors exhibited a clear peak of 5.48 MeV /spl alpha/-particles. Although the 662 keV peak was not resolved in the energy spectra, increased counts above the noise spectrum were observed for the detectors. To our knowledge, it is the first time that TlPbI/sub 3/ detectors exhibit /spl alpha/-particle spectra with a clear peak and /spl gamma/-ray spectra.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"2 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":"123913250","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

Into uncharted waters: the past, present, and future exploration of neutrino physics 进入未知的水域:中微子物理学的过去，现在和未来的探索

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239253

J. Klein

引用次数: 0

A local iterative reconstruction algorithm for planar integral data 平面积分数据的局部迭代重建算法

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239432

G. L. Zeng, D. Gagnon, F. Natterer, Wenli Wang, M. Wrinkler, W. Hawkins

引用次数: 2

Development of a LSO based quality check procedure for the microPET/spl reg/ animal scanner microPET/spl reg/动物扫描仪基于LSO质量检查程序的开发

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI: 10.1109/NSSMIC.2002.1239503

C. Knoess, S. Siegel, D. Newport, R. N. Goble, K. Wienhard, W. Heiss

{"title":"Development of a LSO based quality check procedure for the microPET/spl reg/ animal scanner","authors":"C. Knoess, S. Siegel, D. Newport, R. N. Goble, K. Wienhard, W. Heiss","doi":"10.1109/NSSMIC.2002.1239503","DOIUrl":"https://doi.org/10.1109/NSSMIC.2002.1239503","url":null,"abstract":"In Positron Emission Tomography (PET) hardware problem of the detector system could result in image degradation or image artifacts. Therefore a quality check (QC) procedure is needed to identify defective photomultipliers (PMTs) or electronic components while using the scanner in routine studies. For the microPET/spl reg/ animal scanner no built-in transmission source is available to perform quality scans with reproducible conditions. Therefore the use of the natural radioactive background of the scintillator material LSO was intuitive for the realization of a QC. A QC for the microPET/spl reg/ system was developed. Initial values of relative detector crystal sensitivities are measured in an initial measurement. Sensitivity values in subsequent measurements are compared to the initial values. A logfile is generated, which informs the user about changes in detector sensitivities. The quality check was implemented for a microPET/spl reg/ R4 scanner. Around 1.5 /spl times/ 10/sup 6/ single counts per detector block can be acquired in a 200-800 keV energy window during a 1800 s scan. Differences in crystal sensitivities yield information about drop outs of PMTs or electronic components. Therefore hardware problems can be easily detected without the use of an additional phantom or line source. In addition, the validity of the detector setup and normalization can be tested. This will avoid image artifacts and resolution degradation.","PeriodicalId":385259,"journal":{"name":"2002 IEEE Nuclear Science Symposium Conference Record","volume":"60 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":"121502842","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