Volume 23, Issue 1

A method is presented that uses a vectorial multiscale feature image for wave front propagation between two or more user defined points to retrieve the central axis of tubular objects in digital images. Its implicit scale selection mechanism makes the method more robust to overlap and to the presence of adjacent structures than conventional techniques that propagate a wave front over a scalar image representing the maximum of a range of filters. The method is shown to retain its potential to cope with severe stenoses or imaging artifacts and objects with varying widths in simulated and actual two-dimensional angiographic images.

提出了一种方法，利用矢量多尺度特征图像在两个或多个用户定义点之间进行波前传播，以获取数字图像中管状物体的中心轴。其隐含的尺度选择机制使得该方法比传统技术在波前传播于表示滤波器范围最大值的标量图像时，更能抵抗重叠和相邻结构的存在。该方法在模拟和实际二维血管造影图像中显示出处理严重狭窄、成像伪影以及宽度变化物体的潜力。

Segmentation of medical images has become an indispensable process to perform quantitative analysis of images of human organs and their functions. Normalized Cuts (NCut) is a spectral graph theoretic method that readily admits combinations of different features for image segmentation. The computational demand imposed by NCut has been successfully alleviated with the Nystro/spl uml/m approximation ...

医学图像分割已成为对人体器官及其功能图像进行定量分析不可或缺的过程。归一化切割（NCut）是一种谱图理论方法，易于结合不同特征进行图像分割。通过Nyström近似，NCut的计算负担已成功减轻……

Trabecular or cancellous bone, the type of bone found in the vertebrae and near the joints of long bones, consists of a network of plates and struts. Accurate measurement of trabecular thickness is of significant interest, for example, to assess the effectiveness of anabolic (bone forming) agents of patients with osteoporosis. Here, we introduce a new fuzzy distance transform (FDT)-based thickness...

骨小梁或松质骨是一种存在于椎骨和长骨关节附近的骨骼类型，由板状和杆状结构网络组成。准确测量骨小梁厚度具有重要意义，例如用于评估骨质疏松症患者使用合成代谢（成骨）药物的效果。本文介绍了一种基于模糊距离变换（FDT）的新厚度测量方法...

Vibro-acoustography method is explored for detecting and imaging brachytherapy metal seeds in gel phantoms. In a previous paper, we have shown that some immersed objects' resonance frequencies could be detected by vibro-acoustography. Here, we use this idea to optimize the vibro-acoustic excitation of two different sized brass seeds implanted in an agar gel phantom. In the experiments, the best ex...

探索了振动声学方法在凝胶体模中检测和成像近距离治疗金属种子的应用。在之前的一篇论文中，我们展示了振动声学可以检测到一些浸入物体的共振频率。在这里，我们利用这一想法来优化植入琼脂凝胶体模中的两种不同尺寸黄铜种子的振动声学激发。在实验中，最佳...

Low back pain is a significant problem in the industrialized world. Diagnosis of the underlying causes can be extremely difficult. Since mechanical factors often play an important role, it can be helpful to study the motion of the spine. Digital videofluoroscopy has been developed for this study and it can provide image sequences with many frames, but which often suffer due to noise, exacerbated b...

腰背痛是工业化世界中的一个重要问题。诊断根本原因可能极其困难。由于机械因素通常起着重要作用，研究脊柱的运动可能有所帮助。数字视频透视技术已被开发用于此类研究，它可以提供具有许多帧的图像序列，但通常由于噪声而受到影响，加剧了...

This paper examines an alternative approach to separating magnetic resonance imaging (MRI) intensity inhomogeneity from underlying tissue-intensity structure using a direct template-based paradigm. This permits the explicit spatial modeling of subtle intensity variations present in normal anatomy which may confound common retrospective correction techniques using criteria derived from a global int...

本文研究了一种替代方法，使用直接基于模板的范式将磁共振成像（MRI）强度不均匀性与底层组织强度结构分离。这允许对正常解剖中存在的细微强度变化进行显式空间建模，这些变化可能会混淆使用源自全局内...的常见回顾性校正技术。

Spiculation is a stellate distortion caused by the intrusion of breast cancer into surrounding tissue. Its existence is an important clue to characterizing malignant tumors. Many successful mammographic methods have been proposed to detect tumors with spiculation. Traditional two-dimensional (2-D) ultrasound cannot easily find spiculations because spiculations normally appear parallel to the surfa...

毛刺征是乳腺癌侵入周围组织引起的星芒状变形。它的存在是表征恶性肿瘤的重要线索。许多成功的乳腺X线摄影方法已被提出用于检测伴有毛刺征的肿瘤。传统的二维超声难以发现毛刺征，因为毛刺征通常平行于表面出现。

This paper presents a new method for creating a single panoramic image of a long bone from several individual fluoroscopic X-ray images. Panoramic images are useful preoperatively for diagnosis, and intraoperatively for long bone fragment alignment, for making anatomical measurements, and for documenting surgical outcomes. Our method composes individual overlapping images into an undistorted panor...

本文提出了一种新方法，用于从多张独立的荧光透视X射线图像创建长骨的单张全景图像。全景图像在术前诊断、术中长骨碎片对齐、解剖测量和记录手术结果等方面非常有用。我们的方法将单个重叠图像组合成无失真的全景图...

In most approaches to the problem of two-dimensional homomorphic deconvolution of ultrasound images, the estimation of a corresponding point-spread function (PSF) is necessarily the first stage in the process of image restoration. This estimation is usually performed in the Fourier domain by either successive or simultaneous estimation of the amplitude and phase of the Fourier transform (FT) of th...

在大多数超声图像二维同态反卷积的方法中，估计相应的点扩散函数（PSF）必然是图像恢复过程的第一步。这种估计通常在傅里叶域中通过依次或同时估计傅里叶变换（FT）的幅度和相位来进行……

In many popular texture analysis methods, second or higher order statistics on the relation between pixel gray level values are stored in matrices. A high dimensional vector of predefined, nonadaptive features is then extracted from these matrices. Identifying a few consistently valuable features is important, as it improves classification reliability and enhances our understanding of the phenomen...

在许多流行的纹理分析方法中，像素灰度值之间关系的二阶或更高阶统计量存储在矩阵中。然后从这些矩阵中提取预定义的非自适应特征的高维向量。识别少数始终有价值的特征很重要，因为它提高了分类可靠性并增强了我们对现象的理解...

A common method of increasing hemodynamic response (SNR) in functional magnetic resonance imaging (fMRI) is to average signal timecourses across voxels. This technique is potentially problematic because the hemodynamic response may vary across the brain. Such averaging may destroy significant features in the temporal evolution of the fMRI response that stem from either differences in vascular coup...

在功能磁共振成像（fMRI）中，提高血流动力学响应（SNR）的一种常用方法是跨体素平均信号时间历程。这种技术可能存在问题，因为血流动力学响应可能因脑区而异。这种平均可能会破坏fMRI响应时间演变中的重要特征，这些特征源于血管耦合差异...

In many medical imaging applications, due to the limited field of view of imaging devices, acquired images often include only a part of a structure. In such situations, it is impossible to guarantee that the images will contain exactly the same physical extent of the structure at different scans, which leads to difficulties in registration and in many other tasks, such as the analysis of the morph...

在许多医学成像应用中，由于成像设备的视野有限，获取的图像通常只包含结构的一部分。在这种情况下，无法保证不同扫描中图像包含完全相同的结构物理范围，这导致配准以及许多其他任务（如形态分析）出现困难。

This paper presents a newly developed method to estimate, in magnetic resonance (MR) images, the temperatures reached within the volume of an iceball produced by a cryogenic probe. Building on the direct measurements of the MR signal intensity and its correlation with independent temperature variations at the phase transition from liquid to solid, the thermal information embedded in the images was...

本文提出了一种新开发的方法，用于在磁共振（MR）图像中估计由冷冻探针产生的冰球体积内达到的温度。基于MR信号强度的直接测量及其与液固相变过程中独立温度变化的相关性，图像中嵌入的热信息被...

Provides instructions and guidelines to prospective authors who wish to submit manuscripts.

为希望提交稿件的新作者提供说明和指南。

Presents the table of contents for this issue of the periodical.

呈现本期期刊的目录。

Authors must enclose a signed copy of this form when submitting manuscripts to the Editor of this publication.

作者在向本刊编辑提交稿件时，必须附上本表格的签字副本。

Provides a listing of current committee members and society officers.

提供当前委员会成员和学会官员的列表。

Provides notice of upcoming special issues of interest to practitioners and researchers.

提供关于即将到来的特刊的通知，这对从业者和研究人员感兴趣。