2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)最新文献_第10页

Preliminary studies of a micro-CT for a combined small animal PET/CT scanner 微型CT用于小型动物PET/CT联合扫描仪的初步研究

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008647

M. Khodaverdi, F. Pauly, S. Weber, G. Schroder, K. Ziemons, R. Sievering, H. Halling

引用次数: 21

Modeling SPECT acquisition and processing of changing radiopharmaceutical distributions 模拟SPECT获取和处理变化的放射性药物分布

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008591

Ji Chen, J. Galt, J. Valentine, T. Faber, E.V. Garcia

{"title":"Modeling SPECT acquisition and processing of changing radiopharmaceutical distributions","authors":"Ji Chen, J. Galt, J. Valentine, T. Faber, E.V. Garcia","doi":"10.1109/NSSMIC.2001.1008591","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1008591","url":null,"abstract":"The accuracy of SPECT images is compromised and artifacts may be produced when the radiopharmaceutical distribution changes during image acquisition. Optimization of SPECT acquisition protocols for changing tracer distributions can be difficult not only in patient studies (undesirability of performing repeat studies on the same patient) but also in phantom studies (difficulty of emulating the changing distributions). This study proposes a simulation that allows computer modeling of both tracer kinetics and different acquisition schemes. /sup 99m/Tc Teboroxime (Bracco Diagnostics) is used as a model. SPECT acquisition of a software phantom (NCAT, UNC Chapel Hill) is simulated with photon attenuation, collimator resolution, Compton scatter, Poisson noise, and changing tracer distribution. Short-axis uniformity is used to assess the severity of artifacts in the myocardium. The simulation produces similar artifacts to those found in patient studies with /sup 99m/Tc Teboroxime. This simulation methodology can provide a valuable tool for testing novel acquisition and processing techniques and to facilitate the optimization of SPECT images of changing tracer distributions. Summed fanning (back and forth) acquisitions have been tested and artifact reduced short-axis images obtained. Image restoration techniques are proposed to further improve the image quality. Furthermore, the simulated studies can be compared to the simulations with assigned low liver uptake and no tracer clearance from the myocardium to detect and resolve artifacts through variations in the acquisition and processing schemes.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"15 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":"126650155","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

Optimisation of fibre-optic readout of LSO scintillation crystals with acid etching 酸蚀法优化LSO闪烁晶体的光纤读出

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009207

D. Strul, J. Sutcliffe-Goulden, P. Halstead, P. Marsden

{"title":"Optimisation of fibre-optic readout of LSO scintillation crystals with acid etching","authors":"D. Strul, J. Sutcliffe-Goulden, P. Halstead, P. Marsden","doi":"10.1109/NSSMIC.2001.1009207","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009207","url":null,"abstract":"Optimising the collection of scintillation light is essential for good PET scanner performance, and even more so when the crystals are read out through optical fibres. Acid etching had been proposed as a cost-effective alternative to mechanical polishing, but there are discrepancies between the results published so far. The aim of this work is to gain a better understanding of acid etching and of its effects on the light yield and to assess its application to fibre-optic based configurations, We have examined the surface state of LSO crystals etched for various times and measured their light output in different configurations, with both direct and fibre-optic readout. Our results indicate that crystal etching is a complex process, where different crystal faces may be etched in different ways. Acid etching always resulted in an improvement the light yield and energy resolution of the crystals, and was as efficient as or in many cases superior to, mechanical polishing. While this improvement was somewhat limited for the configurations with direct readout of the crystals we tested, it was much larger for the fibre-optic based configuration.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"138 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":"122572134","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: 10

A bootstrap approach for analyzing the statistical properties of SPECT and PET images 一种分析SPECT和PET图像统计特性的自举方法

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008603

I. Buvat, C. Riddell

引用次数: 10

First results of a dedicated breast PET imager, BPET, using NaI(Tl) curve plate detectors 使用NaI(Tl)曲线板检测器的专用乳房PET成像仪BPET的第一个结果

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008560

R. Freifelder, C. Cardi, I. Grigoraş, J. Saffer, J. Karp

引用次数: 32

Results from a nuclear microprobe analysis of selected rare earth fluor materials 选定稀土含氟材料的核探针分析结果

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008477

W. Hollerman, E. Gates, P. Boudreaux, G. Glass

引用次数: 3

Collimator blurring reduction method using fine angular sampling projection data in SPECT 基于SPECT精细角度采样投影数据的准直器模糊消除方法

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009246

N. Motomura, K. Nambu, A. Kojima, S. Tomiguchi, K. Ogawa

{"title":"Collimator blurring reduction method using fine angular sampling projection data in SPECT","authors":"N. Motomura, K. Nambu, A. Kojima, S. Tomiguchi, K. Ogawa","doi":"10.1109/NSSMIC.2001.1009246","DOIUrl":"https://doi.org/10.1109/NSSMIC.2001.1009246","url":null,"abstract":"Due to the collimator aperture, the spatial resolution of SPECT data varies with source-to-detector distance. Since radius of detector rotation is bigger when scanning larger patients, the spatial resolution is degraded in these cases. Emitted gamma rays travel not only along the central axis of the collimator hole but also off-axis due to collimator aperture. However, an off-axis ray at one angle would be a central-axis ray at another angle; therefore, raw projection data at one angle can be thought of as an ensemble of central-axis rays collected from a small arc equal to collimator aperture. Thus, fine angular sampling can compensate for collimator blurring. By using sampling pitch of less than half the collimator aperture angle, compensation was performed by subtracting the weighted sum of the projection data from the raw projection data. Collimator geometry and detector rotation radius determined the weighting function. A cylindrical phantom with four different-sized rods and torso phantom for Tl-201 cardiac SPECT simulation were used for evaluation. Aperture angle of the collimator was 7 degrees. Projection sampling pitch was 2 degrees. In both phantom studies, the proposed method showed improvement in contrast and reduction of partial volume effect, thereby indicating that the proposed method can compensate adequately for image blurring caused by collimator aperture.","PeriodicalId":159123,"journal":{"name":"2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)","volume":"43 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":"121800391","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

High-resolution x-ray imaging using Rowland-circle Bragg optics 高分辨率x射线成像使用罗兰圈布拉格光学

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1008617

U. Bergmann, M. Ivanovic, P. Glatzel, S. Cramer

引用次数: 1

Evaluation of different types of avalanche photo diodes from Hamamatsu and Perkin-Elmer 来自Hamamatsu和Perkin-Elmer的不同类型雪崩光电二极管的评价

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009694

Liu Jiangui, A. Fremout, P. Bruyndonckx, S. Tavernier, J. Loude, C. Morel

引用次数: 2

Characterization of CdTe crystals grown by the Vertical Bridgman method 垂直布里奇曼法生长CdTe晶体的表征

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310) Pub Date : 2001-11-04 DOI: 10.1109/NSSMIC.2001.1009281

M. Fiederle, A. Fauler, V. Babentsov, J. Franc, J. Ludwig, K. Benz

引用次数: 14