1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference最新文献_第5页

A least squares based phase unwrapping algorithm for MRI 基于最小二乘的MRI相位展开算法

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373599

S. Song, S. Napel, N. Pelc, G. Glover

引用次数: 0

Weak plate mechanical models in Bayesian reconstruction for emission tomography 发射断层扫描贝叶斯重建中的弱板力学模型

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373547

Soojin Lee, Anand Rangarajan, G. Gindi

引用次数: 5

X-ray Image Analysis For Dental Age Evaluation 牙齿年龄评估的x射线图像分析

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.701849

E. Le Saux, J. Meunier, A. Demirjian

引用次数: 0

Improved lesion detection and quantification in emission tomography using anatomical and physiological prior information 利用解剖和生理先验信息改进发射断层扫描中的病变检测和量化

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373626

J. Bowsher, V. Johnson, T. Turkington, G.E. Floyd, R. Jaszczak, R. Coleman

{"title":"Improved lesion detection and quantification in emission tomography using anatomical and physiological prior information","authors":"J. Bowsher, V. Johnson, T. Turkington, G.E. Floyd, R. Jaszczak, R. Coleman","doi":"10.1109/NSSMIC.1993.373626","DOIUrl":"https://doi.org/10.1109/NSSMIC.1993.373626","url":null,"abstract":"In SPECT and PET imaging, radiopharmaceutical concentration is often strongly correlated with anatomical structure. A Bayesian image reconstruction procedure is presented that uses this a priori knowledge to improve the detection and quantification of an unknown number of lesions. The a priori distribution employed encourages the emission tomography segmentation to stay close to the anatomical segmentation. Departures from the anatomical segmentation are detected by calculating and segmenting a deviances image: Let n/sub i/ be the estimated number of photons emitted from voxel i, /spl mu//sub ri/ the estimated mean activity of the region that contains voxel i, and l(/spl lambda//sub i/;n/sub i/) the Poisson log likelihood function for /spl lambda//sub i/, where /spl lambda//sub i/ is the mean of n/sub i/. The deviances are defined as 2(l(n/sub i/;n/sub i/)-l(/spl mu//sub ri/;n/sub i/)). Parts of the image having large deviances are candidates for becoming new regions. Hypothesis testing is performed to determine which of these candidates are justified by the projection data as being new regions. The procedure was tested by adding hot lesions to a bitmap of the Hoffman brain phantom and then simulating noisy projection data. Improvements in detection and quantification of these lesions were observed as compared to FBP and ML-EM reconstructions.<<ETX>>","PeriodicalId":287813,"journal":{"name":"1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124919278","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

Automated CT and MR brain image registration using geometrical feature correlation 基于几何特征相关的CT和MR脑图像自动配准

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373608

P. A. van den Elsen, M. Viergever

引用次数: 10

Segmentation of the body and lungs from Compton scatter and photopeak window data in SPECT: a Monte Carlo investigation SPECT中康普顿散射和光峰窗数据对身体和肺部的分割:蒙特卡罗研究

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373572

T. Pan, M. King, D. de Vries, M. Ljungberg

{"title":"Segmentation of the body and lungs from Compton scatter and photopeak window data in SPECT: a Monte Carlo investigation","authors":"T. Pan, M. King, D. de Vries, M. Ljungberg","doi":"10.1109/NSSMIC.1993.373572","DOIUrl":"https://doi.org/10.1109/NSSMIC.1993.373572","url":null,"abstract":"In SPECT imaging of the chest, non-uniform attenuation correction requires use of a patient specific attenuation map. Such a map can be obtained by estimating the regions occupied by (1) the lungs and (2) the soft tissue and bones, and then assigning values of the attenuation coefficient to each region. The authors propose a method to segment such regions from the Compton scatter and photopeak window SPECT slices of Tc-99m Sestamibi studies. The Compton scatter slices are used to segment the body outline, and to estimate the region of the lungs with the anatomic information on the back bone and sternum locations from the photopeak window slices. To investigate the accuracy of using Compton scatter slices in estimating the regions of the body and the lungs, a Monte Carlo SPECT simulation of an anthropomorphic phantom with an activity distribution and noise characteristics similar to patient data was performed. Different activities were simulated in the lungs to study the influence of lung uptake. Energy windows of various widths were simulated for use in locating a suitable Compton scatter window for imaging. In a separate simulation, the map of the probability of scatter interactions (up to third order) from photons originating at a point within the heart was recorded to allow investigation of the contrast provided by the difference in density between the lungs and surrounding bones and soft tissue. The results demonstrated that (1) sufficient contrast can be derived from Compton scatter data for segmentation of the lungs; (2) accuracy of determination of body and lung regions of about 99% and 89%, respectively, can be achieved and (3) a wide energy window away from the photopeak window for recording the scattered events is preferred for the segmentation of lungs.<<ETX>>","PeriodicalId":287813,"journal":{"name":"1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference","volume":"39 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122809461","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

The Silicon Tracker Of CMS CMS的硅跟踪器

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.701666

G. Tonelli

引用次数: 0

3D visualization of fuzzy shapes using multichannel MR images 使用多通道磁共振图像的模糊形状三维可视化

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.373570

S. Kumamura, N. Niki, Hiromu Nishitani, H. Sato

引用次数: 0

Analytical Solutions Of Minimum Ionization Particle Induced Current Shapes Of Silicon Detectors And Simulation Of Charge Collection Properties 硅探测器最小电离粒子诱导电流形状的解析解及电荷收集特性的模拟

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.701683

V. Eremin, W. Chen, Z. Li

引用次数: 3

Simultaneous Nonlinear Least Squares Fitting Technique For NMR Spectroscopy 核磁共振波谱的非线性最小二乘拟合技术

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI: 10.1109/NSSMIC.1993.701854

W. Ge, H.K. Lee, O. Nalcioglu

引用次数: 1