1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)最新文献_第10页

Stability in the parallel signal transfer mode from a silicon strip focal plane detector 从硅条焦平面探测器的平行信号传输模式的稳定性

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.775138

K. Lan, M. Ahmed, E. Hungerford

引用次数: 0

A 16-channel digital TDC chip 一个16通道数字TDC芯片

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.775181

P. Bailly, J. Chauveau, J. Genat, J. Huppert, H. Lebbolo, L. Roos, Zhang Bo

引用次数: 13

Characterization of polycrystalline TlBr films for radiographic detectors 射线探测仪用多晶TlBr薄膜的表征

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.775231

Phillip R. Bennett, K. S. Shah, L. Cirignano, M. Klugerman, L. Moy, F. Olschner, M. Squillante

引用次数: 42

A DSP based real-time position calculation circuit for beta camera 一种基于DSP的摄像机实时位置计算电路

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773830

S. Yamamoto, T. Matsuda, I. Kanno

引用次数: 0

Investigation of the scatter contribution in single photon transmission measurements by means of Monte Carlo simulations 用蒙特卡罗模拟研究单光子传输测量中的散射贡献

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773923

K. Wegmann, J. Zaers, L. Livieratos, L. Adam, D. Bailey, G. Brix

{"title":"Investigation of the scatter contribution in single photon transmission measurements by means of Monte Carlo simulations","authors":"K. Wegmann, J. Zaers, L. Livieratos, L. Adam, D. Bailey, G. Brix","doi":"10.1109/NSSMIC.1998.773923","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773923","url":null,"abstract":"The fraction of detected scattered radiation in transmission measurements with a single photon transmission (SPT) source was investigated by means of Monte Carlo (MC) techniques. The scatter fraction (SF) was determined in dependence of different energy thresholds and the use of interplane septa. The simulations were validated with measurements performed at the whole-body 3D PET scanner ECAT EXACT 3D (CTV/Siemens, Knoxville, TN), which uses a SPT source. The comparison of the results from the simulations and the measurements shows good agreement. The transmission of a water-filled cylinder (0=20 cm) gave values of the SF of about 27% at a lower level discriminator (LLD) value of 500 keV in the center of the projection. A reduction to 17% was achieved by an increase of the LLD to 600 keV; a relative decrease of 37%. But a corresponding loss of counts by a factor of 1.5 was observed. Furthermore, simulations of the ECAT EXACT HR/sup +/ have been done, a whole-body PET scanner which can be operated in 2D and 3D mode, but not in the SPT mode. At a value of the LLD of 500 keV, the simulations showed a decrease of the SF in the 2D mode of 31% relative to the 3D mode for the transmission of the water-filled cylinder.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126455564","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: 19

Accurate attenuation correction in SPECT imaging using optimization of bilinear functions and assuming an unknown spatially-varying attenuation distribution 利用双线性函数优化和假设未知空间变化衰减分布的SPECT成像中的精确衰减校正

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773865

Ronny Ramlau, R. Clackdoyle

引用次数: 53

Feasibility study of a compact high resolution dual layer LSO-APD detector module for positron emission tomography 用于正电子发射断层成像的紧凑高分辨率双层LSO-APD探测器模块的可行性研究

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.774374

B. Pichler, G. Boning, M. Rafecas, W. Pimpl, E. Korenz, M. Schwaiger, S. Ziegler

{"title":"Feasibility study of a compact high resolution dual layer LSO-APD detector module for positron emission tomography","authors":"B. Pichler, G. Boning, M. Rafecas, W. Pimpl, E. Korenz, M. Schwaiger, S. Ziegler","doi":"10.1109/NSSMIC.1998.774374","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.774374","url":null,"abstract":"An existing high resolution scanner for positron emission tomography (PET) of small animals was modified to investigate a scheme of depth-of-interaction (DOI) detection. The detectors were based on the readout of small (3.7/spl times/3.7/spl times/12 mm/sup 3/) lutetium oxyorthosilicate (LSO) crystals with avalanche photodiodes (APD). For DOI measurements, 4 detector modules (arrays of 2/spl times/8 LSO-APD detectors) were mounted on a rotatable gantry in a dual layer setup. The energy resolution at 511 keV of a detector in the first layer was 17.7% (FWHM), decreasing to 19.3% in the second layer. The intrinsic resolution using detectors in the front layer varied between 2.1 mm and 3.5 mm. Combinations of crystals in the second layer yielded intrinsic resolutions of 2.0 mm to 2.8 mm (FWHM). The systems sensitivity could be increased by 20% when data of the second layer was included. Reconstruction of a /sup 18/F line source yielded a tomographic image resolution of 2.5 mm to 2.6 mm, depending on the usage of data from different layers. Without DOI information, the spatial resolution was 3.0 mm (FWHM). Although a degradation in energy resolution was observed in the dual layer setup compared to only one layer, this study showed the feasibility of individual readout in a dual layer module for improved sensitivity and sampling.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128512441","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: 11

Data weighted vs. non-data weighted dual energy reconstructions for X-ray tomography x射线断层扫描的数据加权与非数据加权双能量重建

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773844

P. Sukovic, N. Clinthorne

引用次数: 8

Monte Carlo simulation of the scatter contribution in a 3D whole-body PET 三维全身PET散射贡献的蒙特卡罗模拟

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773920

L. Adam, J. Karp, G. Brix

{"title":"Monte Carlo simulation of the scatter contribution in a 3D whole-body PET","authors":"L. Adam, J. Karp, G. Brix","doi":"10.1109/NSSMIC.1998.773920","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773920","url":null,"abstract":"Scatter contamination is one of the main reasons for image degradation in 3D Positron Emission Tomography (PET). The knowledge about the amount of scatter and its distribution is a prerequisite for performing an accurate scatter correction. One concern is the scatter contribution from activity outside the field-of-view (FOV) and multiple scatter. We examined the scatter distribution for various phantoms using Monte Carlo simulations. The simulations were performed for a whole-body PET system (ECAT EXACT HR/sup +/, Siemens/CTI). The scanner has an axial FOV of 15.5 cm and a ring diameter of 82.7 cm. With (without) interplane septa the scatter contribution is up to 40(65)% (for a line source in a 40 cm cylinder) of the total counts. The scatter fraction varies significantly with the axial position. The results show also that for an accurate scatter correction, both activity and scatter media outside the FOV have to be taken into account. Furthermore it could be shown that there is a considerable amount of multiple scatter which has a different spatial distribution from single scatter. Therefore multiple scatter cannot be corrected by simply rescaling the single scatter component.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130881962","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

Basic performance of the PET scanner, EXACT HR/sup +/, with adjustable data-acquisition parameters PET扫描仪的基本性能，EXACT HR/sup +/，具有可调的数据采集参数

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI: 10.1109/NSSMIC.1998.773872

T. Hasegawa, Y. Wada, H. Murayama, T. Nakajima

引用次数: 4