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研制用于鼻咽癌放射治疗定位的CT/MRI图像配准辅助装置，并且通过组织勾画差异分析使用该装置后所得配准融合图像在临床中的应用意义。方法 在普通的磁共振头颈线圈中设计特定形状的头枕，保持患者在扫描时与CT定位扫描时相同的体位。采用配对t检验分析CT图像与融合图像中腮腺、下颌骨的勾画差异。结果 患者的头颈部CT、MRI图像的配准精度较未使用该装置的图像具有明显的提高，使用该配准图像得到的融合图像、组织...
Brain Structure Segmentation from MRI by Geometric Surface Flow
Brain Structure Segmentation MRI
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2009/9/8
We present a method for semiautomatic segmentation of brain structures such as thalamus from MRI images based on the concept of geometric surface flow. Given an MRI image, the user can interactively i...
Optimization of Spiral MRI Using a Perceptual Difference Model
MRI Perceptual Difference Model
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2009/9/8
We systematically evaluated a variety of MR spiral imaging acquisition and reconstruction schemes using a computational perceptual difference model (PDM) that models the ability of humans to perceive ...
Reciprocal Benefits of Mass-Univariate and Multivariate Modeling in Brain Mapping: Applications to Event-Related Functional MRI, H215O-, and FDG-PET
MRI H215O FDG-PET
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2009/9/8
In brain mapping studies of sensory, cognitive, and motor operations, specific waveforms of dynamic neural activity are predicted based on theoretical models of human information processing. For examp...
Improving Non-Cartesian MRI Reconstruction through Discontinuity Subtraction
Non-Cartesian MRI Discontinuity Subtraction
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2009/9/8
Non-Cartesian sampling is widely used for fast magnetic resonance imaging (MRI). Accurate and fast image reconstruction from non-Cartesian k-space data becomes a challenge and gains a lot of attention...
A Note on the Iterative MRI Reconstruction from Nonuniform k-Space Data
the Iterative MRI Nonuniform k-Space Data
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2009/9/7
In magnetic resonance imaging (MRI), methods that use a non-Cartesian grid in k-space are becoming increasingly important. In this paper, we use a recently proposed implicit discretisation scheme whic...
Registration of Brain MRI/PET Images Based on Adaptive Combination of Intensity and Gradient Field Mutual Information
MRI/PET Images Intensity
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2009/9/7
Traditional mutual information (MI) function aligns two multimodality images with intensity information, lacking spatial information, so that it usually presents many local maxima that can lead to ina...
Brain MRI Segmentation with Multiphase Minimal Partitioning: A Comparative Study
Brain MRI Segmentation Multiphase Minimal Partitioning
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2009/9/7
This paper presents the implementation and quantitative evaluation of a multiphase three-dimensional deformable model in a level set framework for automated segmentation of brain MRIs. The segmentatio...
A Feature-Selective Independent Component Analysis Method for Functional MRI
Feature-Selective Independent Component Functional MRI
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2009/9/7
In this work, we propose a simple and effective scheme to incorporate prior knowledge about the sources of interest (SOIs) in independent component analysis (ICA) and apply the method to estimate brai...
基于MRI数据的人体器官三维重建
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2007/7/25
三维医学图像可视化在最近的10年间得到了极其广泛的应用，而且在迅速发展。它已经在临床上有了广泛的应用。如在解剖结构可视化、手术规划与模拟以及放射治疗[1][2][3][4][5]等方面都起到越来越重要的作用。而在放射医学、辐射防护、辐射危害评价、以及在载人航天工程中，对航天员的辐射安全问题研究等诸多领域，计算和分析人体关键器官或组织所接受的当量剂量是必须的。但人体各器官受到的辐射剂量往往不能直接获...