2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)最新文献_第3页

Radiation hard strip detectors on oxygenated silicon 氧化硅辐射硬条探测器

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008522

L. Andricek, G. Lutz, H. Moser, R. Richter

引用次数: 2

Active pixel sensors on high resistivity silicon and their readout 高电阻硅有源像素传感器及其读数

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009718

W. Chen, G. Geronimo, Zheng Li, Paul O’Connor, V. Radeka, P. Rehak, Graham C. Smith, Bin Yu

引用次数: 32

Performance evaluation of 2D compact PET systems - with applications to system design optimization 二维紧凑型PET系统的性能评估-在系统设计优化中的应用

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008558

C. Kao, Chin-Tu Chen

引用次数: 0

Correction methods for random coincidences in 3D wholebody PET imaging 三维全身PET成像随机重合校正方法

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009234

D. Brasse, Paul Kinahan, C. Lartizien, C. Corntat, M. Casey, C. Michel, T. Bruckbauer

{"title":"Correction methods for random coincidences in 3D wholebody PET imaging","authors":"D. Brasse, Paul Kinahan, C. Lartizien, C. Corntat, M. Casey, C. Michel, T. Bruckbauer","doi":"10.1109/NSSMIC.2001.1009234","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009234","url":null,"abstract":"With the advantages of the increased sensitivity of 3D PET imaging for wholebody imaging come the challenges of more complicated quantitative corrections, and in particular an increase in the random coincidence field of view (FOV) relative to the true coincidence FOV. The most common method of correcting for random coincidences is the on-line subtraction of a delayed coincidence channel, which does not add bias but increases noise. An alternative approach is the post-acquisition subtraction of a low noise random coincidence estimate, which can be from a smoothed delayed coincidence channel, a calibration scan, or directly estimated. Each method makes different tradeoffs between noise amplification, bias, and data processing requirements. These tradeoffs are dependent on activity injected, the local imaging environment (e.g. near the bladder), and the reconstruction algorithm. Using 3D wholebody simulations and phantom studies, we show that the gains in sinogram NEC by using a noiseless random coincidence estimation method are translated to improvements in image SNR. The image SNR, however, depends on the image reconstruction method and the local imaging environment. For 3D wholebody imaging, a low noise estimate of random coincidences based on the single photon rates improves sinogram and image SNRs by approximately 15% compared to on-line subtraction of delayed coincidences, and performs only slightly worse than using a 3D extension of the Casey-Hoffman smoothing of a separately acquired delayed coincidence sinogram.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"55 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":"125085044","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

Simultaneous estimation of attenuation and activity images using optimization transfer 利用优化传递的衰减和活动图像的同时估计

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009235

M. Jacobson, J. Fessler

{"title":"Simultaneous estimation of attenuation and activity images using optimization transfer","authors":"M. Jacobson, J. Fessler","doi":"10.1109/NSSMIC.2001.1009235","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009235","url":null,"abstract":"This paper addresses the application of optimization transfer to simultaneous statistical estimation of attenuation and activity images in tomographic Image reconstruction. Although the technique we propose has wider applicability, we focus on the problem of reconstructing from data acquired via a post-injection transmission scan protocol. In this protocol, emission scan data Is supplemented with transmission scan data that is acquired after the patient has received the Injection of radio-tracer. The negative loglikelihood function for this data is a complicated function of the activity and attenuation images, leading to an objective function for the model that is difficult to minimize for the purpose of estimation. Previous work on this problem showed that when either the attenuation or activity image was held fixed, a paraboloidal surrogate could be found for the negative loglikelihood as a function of the remaining variables. This led to an algorithm In which the model's objective function is alternately minimized as a function of the attenuation and activity, using the optimization transfer technique. In the work we present here, however, we develop bivariate surrogates for the loglikelihood, i.e., functions that serve as surrogates with respect to both the attenuation and activity variables. Hence, simultaneous minimization in all variables can be carried out, potentially leading to convergence in fewer surrogate minimizations.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"37 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":"125889284","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: 4

Average energy required per scintillation photon and energy resolution in inorganic, scintillation crystals for gamma-rays 在伽马射线的无机闪烁晶体中，每闪烁光子所需的平均能量和能量分辨率

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009717

S. Sasaki, H. Tawara, K. Saito, M. Miyajima, E. Shibamura

引用次数: 1

Lung image segmentation and registration for quantitative image analysis 肺图像分割与配准定量图像分析

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008596

H. Haneishi, H. Ue, N. Takita, H. Toyama, T. Miyamoto, N. Yamamoto, Y. Mori

{"title":"Lung image segmentation and registration for quantitative image analysis","authors":"H. Haneishi, H. Ue, N. Takita, H. Toyama, T. Miyamoto, N. Yamamoto, Y. Mori","doi":"10.1109/NSSMIC.2001.1008596","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1008596","url":null,"abstract":"Functional images obtained PET and/or SPECT become more useful when those images are provided with detail anatomical information obtained by X ray CT or MRI. A series of image processing including image registration and segmentation is presented for quantitative analysis of functional images. A clinical application described in the paper is to evaluate the effect of radiation therapy for lung cancer on lung functions quantitatively. Though SPECT images give information on lung functions such as ventilation and perfusion, it is difficult to identify correctly the location and amount of radioactivity distribution with only those images. To overcome this difficulty, we synthesize both anatomical image (X ray CT, or shortly XCT) and functional image (SPECT) effectively. Furthermore, we have developed a method for dividing lung in XCT image into the lobes that are anatomically meaningful. The segmented lobes in XCT image can be used for quantitative evaluation in each lobe. Change in perfusion at each lobe of lung along with the therapy is presented as an effective example.","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":"116528552","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: 5

Mineral oil tests for the MiniBooNE detector MiniBooNE探测器的矿物油测试

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008520

J. Raaf, A. Bazarko, G. Garvey, E. Hawker, R. A. Johnson, G. B. Mills, A. Pla-Dalmau, R. Tayloe

引用次数: 10

Quasi-elastic neutron scattering and NMR investigation of the molecular dynamics in bitumen compounds 沥青化合物分子动力学的准弹性中子散射和核磁共振研究

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008488

V. Tripadus, R. Grosescu, L. Crăciun, M. Peticila, O. Muresan

{"title":"Quasi-elastic neutron scattering and NMR investigation of the molecular dynamics in bitumen compounds","authors":"V. Tripadus, R. Grosescu, L. Crăciun, M. Peticila, O. Muresan","doi":"10.1109/NSSMIC.2001.1008488","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1008488","url":null,"abstract":"The preliminary results of the combined NMR and neutron scattering investigations on bitumen compounds are reported. The goal of the study is to bring information about the molecular dynamics in various phases of these compounds and on this basis to test and/or improve the microscopic models for them. The quasielastic peaks in the neutron scattering spectra give direct information about diffusion motions via the linewidth dependence on the transfer momentum k/sup 2/. On this basis we calculate an overall diffusion constant D/sub n/ = 1.26*10/sup -7/ cm/sup 2//s, at T = 293K. The temperature dependence of the NMR spin-lattice relaxation time is well described by two V-type relaxation mechanisms that can be associated with two simultaneous and independent reorientational molecular motions, characterized by the correlation times /spl tau//sub c/(1) = 20/spl middot/10/sup -9/ s and /spl tau//sub c/(2) = 0.44/spl middot/10/sup -9/ s (T = 293K). Combining the NMR output /spl tau//sub c/(1) and /spl tau//sub c/(2) and the neutron scattering output (D/sub n/), it was possible to determine the upper limits for the radii of the molecular fragments involved in these motions: a/sub 1/ = 10/spl Aring/ and a/sub 2/ = 2/spl Aring/. The first value is in good agreement with the neutron incoherent elastic structure factor data which predicts a molecular scattering \"globule\" of radius d /spl cong/ 9/spl Aring/.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"152 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":"114249391","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

Radially-dependent nonlinear sinogram filtering 径向相关非线性正弦图滤波

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008600

B. Andia, K. Sauer, C. Bouman

引用次数: 4