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

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Evaluation of analytical methods for fast and accurate image reconstruction in 3D SPECT 三维SPECT快速准确图像重建分析方法的评价
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.1998.773848
C. Kao, Xiaochuan Pan
{"title":"Evaluation of analytical methods for fast and accurate image reconstruction in 3D SPECT","authors":"C. Kao, Xiaochuan Pan","doi":"10.1109/NSSMIC.1998.773848","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773848","url":null,"abstract":"The authors implemented for the first time analytical methods for image reconstruction in 3D SPECT with uniform attenuation and distance-dependent blurring. The implementation is computationally fast and requires less than 4 minutes to reconstruct a 128/spl times/128/spl times/128 image on a personal computer. The authors conducted quantitative evaluation of the reconstruction methods and revealed that, when the deblurring is considered, these reconstruction methods are highly susceptible to noise. They then developed a Wiener apodizing window function for suppression of the amplification of data noise in the reconstructed images. They also evaluated the performance of the proposed Wiener window function and the frequently used truncation window function with both noiseless and noisy data. The authors' numerical results demonstrated that the proposed Wiener window function generally yields 3D SPECT images from noisy data with visual quality better than and quantitative accuracy comparable to that of the truncation window function.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"50 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":"132357194","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
Plutonium detection with a new fission neutron survey meter 新型裂变中子测量仪对钚的探测
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.1998.774340
A. Klett
{"title":"Plutonium detection with a new fission neutron survey meter","authors":"A. Klett","doi":"10.1109/NSSMIC.1998.774340","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.774340","url":null,"abstract":"The search for illicit trafficking or hidden plutonium sources has, especially since the breakdown of the former Soviet Union, really become an issue. Plutonium is extremely dangerous and hard to detect over larger distances. The /spl alpha/-particles and X-rays which are emitted by plutonium isotopes could easily be shielded by the material itself or by surroundings. Besides a few /spl gamma/'s the only penetrating radiation emitted by plutonium samples are neutrons from spontaneous fission. Therefore the special neutron survey meter LB6414 with unrivalled sensitivity for fission neutrons has been newly designed.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"19 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":"132471005","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
X-ray 3D computed tomography of bronze archaeological samples 青铜考古样品的x射线三维计算机断层扫描
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.1998.775164
M. Rossi, F. Casali, P. Chirco, M. Morigi, E. Nava, E. Querzola, M. Zanarini
{"title":"X-ray 3D computed tomography of bronze archaeological samples","authors":"M. Rossi, F. Casali, P. Chirco, M. Morigi, E. Nava, E. Querzola, M. Zanarini","doi":"10.1109/NSSMIC.1998.775164","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.775164","url":null,"abstract":"X-ray cone-beam computed tomography (CT) is one of the most powerful non-destructive testing (NDT) technique for the whole 3D inspection of a sample. The development of suitable 2D detectors has permitted the set-up of very fast and efficient CT systems able to collect and reconstruct hundreds of tomographic slices in short time and with a more efficient use of the X-ray flux. At present, this technique is widely applied in industrial field but it can be employed successfully even in the analysis and restoration of archaeological samples. An experimental 3D CT system has been set up at the Physics Department of University of Bologna (Italy) for the investigation of small bronze objects. Preliminary tests have been carried out on an Etruscan fibula and results concerning radiographic inspection, slice tomographic analysis and 3D reconstruction of the object will be presented.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"126 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":"129990444","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
Design and performance of a magnetic spectrometer for antimatter search in space 空间反物质搜索磁谱仪的设计与性能
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.1998.775132
M. Menichelli
{"title":"Design and performance of a magnetic spectrometer for antimatter search in space","authors":"M. Menichelli","doi":"10.1109/NSSMIC.1998.775132","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.775132","url":null,"abstract":"The conceptual design of the spectrometer and the scientific goals of the AMS experiment, are presented here as well as the measured performances for minimum ionising particles using ground level cosmic-rays and reconstructed events from space. The first results of a test done with relativistic carbon ions at GSI (Darmstadt) are also given. A preliminary version of the AMS apparatus flew on June 1998 on shuttle mission STS-91. In 2002 the complete system will be installed on the space station Alpha and it will take data for three years.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"24 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":"130033481","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
Hybrid collimation for industrial gamma ray imaging: combining spatially coded and Compton aperture data 工业伽马射线成像的混合准直:结合空间编码和康普顿孔径数据
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.1998.774344
L. Smith, C. Chen, Z. He, D. Wehe
{"title":"Hybrid collimation for industrial gamma ray imaging: combining spatially coded and Compton aperture data","authors":"L. Smith, C. Chen, Z. He, D. Wehe","doi":"10.1109/NSSMIC.1998.774344","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.774344","url":null,"abstract":"The combination of a mechanically-collimated gamma-ray camera with an electronically-collimated gamma camera offers both the high efficiency and good angular resolution typical in a mechanically-collimated camera for lower photon energies and the uncoupling of spatial resolution and efficiency provided by an electronically-collimated camera at higher energies. The hybrid portable gamma camera (HPGC) combines a MURA coded aperture camera with a Compton scatter camera to provide a broad range of energy response suitable for industrial imaging situations (50 keV to 2 MeV). This paper compares the relative information content per photon for the three imaging modalities possible with the HPGC: mechanical collimation, electronic collimation and hybrid collimation, which combines information from the spatially-coded aperture with Compton aperture information (on an event-by event basis).","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"2 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":"130034295","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
Experimental results of electron confinement in a silicon drift detector with saw tooth shaped p/sup +/ strips 锯齿形p/sup +/条硅漂移检测器中电子约束的实验结果
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.1998.775228
J. Šonský, H. Valk, J. Huizenga, R. Hollander, C. V. van Eijk, P. Sarro
{"title":"Experimental results of electron confinement in a silicon drift detector with saw tooth shaped p/sup +/ strips","authors":"J. Šonský, H. Valk, J. Huizenga, R. Hollander, C. V. van Eijk, P. Sarro","doi":"10.1109/NSSMIC.1998.775228","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.775228","url":null,"abstract":"Recently it has been experimentally shown that saw tooth shaped p/sup +/ strips allows confinement of drifting electrons in the lateral direction. This is achieved by means of potential gutters induced by an appropriate saw tooth design of p/sup +/ cathodes. The saw tooth period p/sub x/ (=anode pitch) is the parameter mainly determining the maximal capacity of confined charge. Up-to-now the confinement effect was experimentally observed with a saw tooth detector with p/sub x/=500 /spl mu/m. The final detector is intended to have an anode pitch of 250 /spl mu/m. The simulation of a saw tooth configuration with p/sub x/=250 /spl mu/m, p/sub y/=200 /spl mu/m, and /spl alpha/=60/spl deg/ showed that potential gutters with a depth of 80 mV will be produced assuming a drift field of 250 V/cm. We will give experimental evidence of these shallow charge confining potential gutters.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"44 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":"131891083","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
Influence of radioactivity out of the field of view on 3D PET dynamic measurement with [/sup 11/C]MP4A 视场外放射性对MP4A [/sup 11/C]三维PET动态测量的影响
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.1998.773887
T. Hasegawa, M. Suzuki, H. Murayama, T. Irie, K. Fukushi, Y. Wada
{"title":"Influence of radioactivity out of the field of view on 3D PET dynamic measurement with [/sup 11/C]MP4A","authors":"T. Hasegawa, M. Suzuki, H. Murayama, T. Irie, K. Fukushi, Y. Wada","doi":"10.1109/NSSMIC.1998.773887","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773887","url":null,"abstract":"This study assessed the influence of radioactivity out of the field of view (out-of-FOV) on the measurement of brain acetylcholinesterase (AChE) activity with tracer [/sup 11/C] N-methyl-4-piperidyl-acetate by positron emission tomography in the three-dimensional mode. From dynamic scans on a volunteer, it was found that the out-of-FOV radioactivity in the chest was much higher than that of the brain immediately after tracer injection. Representative phantom measurement was performed to quantitate systematic errors due to the out-of-FOV radioactivity using the implemented scatter and attenuation correction and reconstruction algorithms. Resultant errors in the AChE activity (k3 parameter) as calculated by compartment model analysis were found to be less than about one percent in all of the brain regions of interest.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"14 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":"125201751","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
An event related potentials (ERPs) imaging system for brain research 脑研究用事件相关电位成像系统
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.1998.773902
S. Yamamoto
{"title":"An event related potentials (ERPs) imaging system for brain research","authors":"S. Yamamoto","doi":"10.1109/NSSMIC.1998.773902","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773902","url":null,"abstract":"An event related potentials (ERPs) imaging system was developed for brain research. The system consists of a personal computer based 19 channel EEG recorder, a visual stimulator, an auditory stimulator and a somatosensory stimulator. The response time can be also measured simultaneously. The EEG decoder starts to accumulate the brain potential signals at 100 ms before the stimulation. The accumulated signals which correspond to ERPs can be displayed in two dimensional distribution which is useful to estimate the position information of activation. Using the developed ERPs imaging system, temporal information as well as position information can be obtained. We conclude that the ERPs imaging system is useful for brain research.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"3 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":"128897718","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
Beam test results for the DO upgrade microstrip tracker DO升级微带跟踪器的波束测试结果
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.1998.774805
G. Steinbruck
{"title":"Beam test results for the DO upgrade microstrip tracker","authors":"G. Steinbruck","doi":"10.1109/NSSMIC.1998.774805","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.774805","url":null,"abstract":"Results of the analysis from data taken during a 1997 testbeam at Fermilab are presented. The performance of Si microstrip detectors are studied which will be used in the Silicon Tracker that is part of the upgrade of the DO detector currently under way. Special consideration is given to modeling of the drift of charge clusters in a magnetic field.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"120 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":"131694852","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
Scatter correction techniques in 3D PET: a Monte Carlo evaluation 散射校正技术在3D PET:蒙特卡罗评价
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.1998.775241
I. Castiglioni, O. Cremonesi, M. Gilardi, V. Bettinardi, G. Rizzo, A. Savi, E. Bellotti, F. Fazio
{"title":"Scatter correction techniques in 3D PET: a Monte Carlo evaluation","authors":"I. Castiglioni, O. Cremonesi, M. Gilardi, V. Bettinardi, G. Rizzo, A. Savi, E. Bellotti, F. Fazio","doi":"10.1109/NSSMIC.1998.775241","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.775241","url":null,"abstract":"In this work a Monte Carlo software package, PET-EGS, designed to simulate realistic PET clinical studies, was used to assess three different approaches to scatter correction in 3D PET: analytical (gaussian fitting technique), experimental (dual energy window technique), probabilistic (Monte Carlo technique). Phantom and clinical studies were performed by 3D PET and simulated by PET-EGS. Clinical studies were simulated assuming PET emission/transmission multivolume images as voxelized source objects describing the distribution of both the radioactivity and attenuation coefficients and accounting for out-of-field activity and media. The accuracy of PET-EGS in modeling the physical response of a 3D PET scanner was assessed by statistical comparison between measured and total (scatter+unscatter) simulated distributions (probability for the two distributions to be the same distribution: p>0.95). The accuracy of the scatter models, for each scatter correction technique, was evaluated on sinograms by statistical comparison between the estimated and the simulated scatter distributions (agreement <1 /spl sigma/). The accuracy of scatter correction was evaluated on sinograms by comparison between scatter corrected and simulated unscatter distributions (residual scatter fraction <13 %).","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"3 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":"115202814","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: 57
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