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

The NA48 liquid krypton calorimeter description and performances NA48液氪量热计描述及性能

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1999-01-11 DOI: 10.1109/NSSMIC.1998.774807

Jose Ocariz

引用次数: 2

Performance characterization and first clinical evaluation of a intra-operative compact gamma imager 术中紧凑伽马成像仪的性能特征和首次临床评价

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.1998.774392

L. Ménard, Y. Charon, M. Solal, M. Ricard, P. Laniece, R. Mastrippolito, L. Pinot, L. Valentin

{"title":"Performance characterization and first clinical evaluation of a intra-operative compact gamma imager","authors":"L. Ménard, Y. Charon, M. Solal, M. Ricard, P. Laniece, R. Mastrippolito, L. Pinot, L. Valentin","doi":"10.1109/NSSMIC.1998.774392","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.774392","url":null,"abstract":"The growing interest of cancer surgeons for intra-operative probes has led to the development of several prototypes of high resolution mini gamma cameras. The aim of this paper is to present a global characterization of the one the authors developed and the corresponding first evaluation in a clinical context. The current prototype of POCI (peroperative compact imager) is a 24 mm diameter intensified position sensitive diode. In order to face the various clinical situations, two sets of collimator/scintillator imaging head have been developed either for high spatial resolution or high efficiency purposes, Both of them have been first optimized for /sup 99m/Tc labeled tumor detection. Intrinsic performances are the following: the spatial resolution ranges from 1 mm up to 1.9 mm (without significant distortion) and the corresponding efficiency ranges from 6.10/sup -h/ up to 2.10/sup -4/. Phantom studies illustrating these results are proposed. First clinical evaluation of POCI concerned sentinel lymph node imaging which is included in melanoma and breast cancer staging protocols. Preliminary results already show that performances of POCI are compatible with intra-operative imaging purposes and suggest how such mini-cameras can improve the success rate of tumor removal surgeries.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"17 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":"124878945","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: 20

A new approach to exact cone-beam reconstruction without Radon transform 一种无需Radon变换的锥束精确重建方法

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.1998.773855

H. Kudo, N. Miyagi, T. Saito

引用次数: 8

Estimation of kinetic constants in double injection FDG-PET studies: application in neurology and oncology 双注射FDG-PET研究中动力学常数的估计:在神经病学和肿瘤学中的应用

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.1998.773874

M. Bentourkia, A. Bol, J. Bodart, C. Michel, A. Coppens, M. Sibomana, D. Labar, A. D. Volder

{"title":"Estimation of kinetic constants in double injection FDG-PET studies: application in neurology and oncology","authors":"M. Bentourkia, A. Bol, J. Bodart, C. Michel, A. Coppens, M. Sibomana, D. Labar, A. D. Volder","doi":"10.1109/NSSMIC.1998.773874","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773874","url":null,"abstract":"In order to characterize physiological cerebral activation or tissue response to a treatment, at least two FDG-PET studies are mandatory. In this work, a study of one hour duration with two injections at 30 min apart is reported. The separation of the two input curves (IC) consisted of fitting the blood curve corresponding to the first injection using spectral analysis, then estimating the second blood curve by removing the remnant of the first. Tissue time activity curves (tTAC) were fitted for the first 30 min using the first IC and were extrapolated till 60 min. This extrapolated part was removed from the tissue response to the second injection before being fitted using the second IC. Other data were obtained for simple injection from which regional cerebral metabolic rates for glucose (rCMRGlu) estimated from 0-30 min were compared to those obtained from 0-60 min. Maximal rCMRGlu differences in double injection with activation were found to be on the average four times higher than those from 0-30 and 0-60 min baseline simple injection. The method is expected to be more accurate to observe drug uptake or tumor response to a treatment.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"26 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":"125858747","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: 1

A maximum a posteriori algorithm for the reconstruction of dynamic SPECT data 一种动态SPECT数据重建的最大后验算法

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.1998.773943

D. Kadrmas, G. Gullberg

{"title":"A maximum a posteriori algorithm for the reconstruction of dynamic SPECT data","authors":"D. Kadrmas, G. Gullberg","doi":"10.1109/NSSMIC.1998.773943","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773943","url":null,"abstract":"A 4D ordered-subsets maximum a posteriori (OSMAP) algorithm for dynamic SPECT is described. It uses a temporal prior that constrains each voxel's behavior in time to obey a compartmental model. No a priori limitations on kinetic parameters are applied; rather, the parameter estimates evolve as the algorithm iterates to a solution. The estimated parameters are also used to model changes in the activity distribution as the camera rotates, avoiding artifacts due to data inconsistencies between angles. This allows for fewer, longer duration scans to be used. Initial evaluations of the algorithm are presented for dynamic cardiac SPECT imaging with teboroxime using a two compartment model. Canine study results demonstrated qualitative improvements for OSMAP compared to OSEM. In a simulation 100 noise realizations were reconstructed using both OSEM and OSMAP. Population means and standard deviations of regional kinetic parameters were compared: True values: k/sub 21/=0.8, k/sub 12/=0.4 min/sup -1/; OSEM: k/sub 21/=77/spl plusmn/06, k/sub 12/=41/spl plusmn/06; OSMAP: L/sub 21/=.76/spl plusmn/.04, k/sub 12/=.41/spl plusmn/.05. The OSMAP algorithm provided parameter estimates with significantly lower standard deviations than did OSEM at similar levels of bias. This algorithm may where potentially improve dynamic SPECT imaging through its implications for noise control, ability to accurately model and reconstruct data in which the activity distribution is changing, and the potential for accurate reconstruction and data analysis using fewer, longer duration scans.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"37 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":"125407571","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

Performance of quasi-exact cone-beam filtered backprojection algorithm for axially truncated helical data 轴向截断螺旋数据的准精确锥束滤波反投影算法性能

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.1998.771651

H. Kudo, S. Park, F. Noo, M. Defrise

引用次数: 21

Fuzzy clustering driven anisotropic diffusion: enhancement and segmentation of cardiac MR images 模糊聚类驱动的各向异性扩散:心脏MR图像的增强与分割

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.1998.773901

Gerardo I. Sanchez – Ortiz

{"title":"Fuzzy clustering driven anisotropic diffusion: enhancement and segmentation of cardiac MR images","authors":"Gerardo I. Sanchez – Ortiz","doi":"10.1109/NSSMIC.1998.773901","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.773901","url":null,"abstract":"Previously, we proposed a second rank tensor conductance function with an explicit dependence on the space coordinates and the data function. This scheme gives the equations an intrinsic anisotropic character not present in previous approaches, and allows the use of a priori knowledge of the system in multi-feature and multi-dimensional images. In this article we extend this scheme by introducing a fuzzy clustering algorithm that, using information about the intensity distribution, divides the image domain into regions and assigns every pixel in the image a degree of membership to the clusters, i.e. a probability of belonging to each of the regions. For this purpose we employ a fuzzy c-means algorithm in which we introduce a priori knowledge about the system by using a planispheric coordinate system that exploits the approximate elliptic-paraboloidal shape and symmetry of the left ventricle. The fuzzy classification of the image domain provides a measure of the probability that neighbouring pixels belong to the same tissue type, and is therefore incorporated into the diffusion process by means of the conductance function. The clustering is updated at regular intervals during the diffusion process, and the initially coarse segmentation of the image is gradually improved until it converges to a meaningful segmentation of the image regions as the smoothing action of the diffusion process clears the image from noise.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"12 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":"126832820","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: 16

Multi-frequency reference function to reduce noise in functional MRI 多频参考函数降低功能性MRI噪声

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.1998.773861

L. Al-Dayeh, T. Kim, W. Sungkarat, M. Singh

引用次数: 2

Charge transport in non-irradiated and irradiated silicon diodes 未辐照和辐照硅二极管中的电荷输运

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.1998.775147

C. Leroy, P. Roy, G. Casse, M. Glaser, E. Grigoriev, F. Lemeilleur

{"title":"Charge transport in non-irradiated and irradiated silicon diodes","authors":"C. Leroy, P. Roy, G. Casse, M. Glaser, E. Grigoriev, F. Lemeilleur","doi":"10.1109/NSSMIC.1998.775147","DOIUrl":"https://doi.org/10.1109/NSSMIC.1998.775147","url":null,"abstract":"A model describing the transport of charge carriers generated in silicon detectors (standard planar float zone and MESA diodes) by ionizing particles is presented. The current pulse response induced by /spl alpha/ and /spl beta/ particles in non-irradiated detectors and detectors irradiated up to fluences /spl Phi//spl ap/3/spl middot/10/sup 14/ particles/cm/sup 2/ is reproduced through this model: i) by adding a small n-type region 15 /spl mu/m deep on the p/sup +/ side for the standard planar float zone detectors at fluences beyond the n to p-type inversion and ii) for the MESA detectors, by considering one dead layer 14 /spl mu/m deep (observed experimentally) on each side, and introducing a second (delayed) component. For both types of detectors, the model gives mobilities decreasing linearity up to fluences of about 5/spl middot/10/sup 13/ particles/cm/sup 2/ and converging, beyond, to saturation values of about 1000 cm/sup 2//Vs and 455 cm/sup 2//Vs for electrons and holes, respectively. At a fluence /spl Phi//spl ap/10/sup 14/ particles/cm/sup 2/, charge collection deficits of about 13% for /spl beta/ particles, 25% for /spl alpha/ particles incident on the front and 35% for /spl alpha/ particles incident on the back of the detector are found for both type of diodes.","PeriodicalId":129202,"journal":{"name":"1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)","volume":"114 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":"116530870","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: 1

Effects of inhomogeneity in plane shielding construction 非均匀性对平面屏蔽结构的影响

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.1998.774347

V. Lazurik, A. Lisitskiy, S. Pismeneskiy, Y. Rogov

引用次数: 1