Fat/water separation and fat minimization magnetic resonance imaging systems and methods
    1.
    发明授权
    Fat/water separation and fat minimization magnetic resonance imaging systems and methods 有权
    脂肪/水分离和脂肪最小化磁共振成像系统和方法

    公开(公告)号:US07099499B2

    公开(公告)日:2006-08-29

    申请号:US10219637

    申请日:2002-08-15

    IPC分类号: G06K9/00

    摘要: Systems and methods for identifying the relative contribution of fat and water signals in a magnetic resonance (“MR”) image including an algorithm operable for selecting an image signal model, selecting a scan parameter, forming a bias field estimate, applying a bias correction to a phase image, estimating the signal fraction of fat and water at each of a plurality of voxels, and forming a fat-suppressed image, a water-suppressed image, or a combination of a fat-based image and a water-based image. The (“MRI”) fat suppression systems and methods requiring only a single image acquisition including an algorithm operable for selecting a relative phase of approximately θ=π/2 or another suitable relative phase, employing an expectation maximization algorithm to classify the phase of the complex image, and projecting complex vectors into fat and water components to obtain fat and water images.

    摘要翻译: 用于识别在包括可用于选择图像信号模型的算法的磁共振(“MR”)图像中的脂肪和水信号的相对贡献的系统和方法,选择扫描参数,形成偏置场估计,将偏置校正应用于 相位图像,估计多个体素中的每一个的脂肪和水的信号分数,以及形成脂肪抑制图像,水分抑制图像或基于脂肪的图像和水基图像的组合。 (“MRI”)脂肪抑制系统和方法仅需要单个图像采集,包括可用于选择大约θ= pi / 2的相对相位的算法或另一合适的相对相位,采用期望最大化算法来分类 复杂的图像,并将复杂矢量投影到脂肪和水分中,以获得肥胖和水分图像。

    Reducing Noise in an Image
    2.
    发明申请
    Reducing Noise in an Image 有权
    减少图像中的噪音

    公开(公告)号:US20110019935A1

    公开(公告)日:2011-01-27

    申请号:US12823377

    申请日:2010-06-25

    IPC分类号: G06K9/40

    摘要: A computer-implemented method for reducing noise in an image includes receiving a first image in a computer system. The first image depicts an interior of an item and is generated using a technique that provides imaging at selected depths in the item. The first image represents a first interior section having a first thickness. The method includes determining a modification for the first image using a second image of the interior. The second image represents a second interior section encompassing the first interior section and has a second thickness greater than the first thickness. The method includes storing the modification in association with the first image.

    摘要翻译: 用于降低图像中的噪声的计算机实现的方法包括在计算机系统中接收第一图像。 第一图像描绘物品的内部并且使用在物品中的选定深度处提供成像的技术生成。 第一图像表示具有第一厚度的第一内部部分。 该方法包括使用内部的第二图像来确定第一图像的修改。 第二图像表示包围第一内部部分并且具有大于第一厚度的第二厚度的第二内部部分。 该方法包括与第一图像相关联地存储修改。

    System and method for detecting objects with differential operators
    3.
    发明申请
    System and method for detecting objects with differential operators 有权
    用差分算子检测物体的系统和方法

    公开(公告)号:US20050226360A1

    公开(公告)日:2005-10-13

    申请号:US10818049

    申请日:2004-04-06

    摘要: A system and a method for detecting an object, such as an explosive device or material, located within a closed article, such as a piece of luggage or a parcel. The system includes an acquisition subsystem for acquiring information pertaining to a specific object, a reconstruction subsystem for reconstructing acquired information pertaining to the specific object into image data, and a computer-aided detection subsystem adapted for identifying the specific object through the use of differential operators. The method includes obtaining image data of the one object, computing a differential operator for each voxel of the image data, computing eigenvalues and eigenvectors for each of the voxels, and computing a scalar function of the eigenvalues to ascertain whether each of the voxels represents a portion of the one object.

    摘要翻译: 用于检测位于封闭物品(例如行李或包裹)内的物体(例如爆炸装置或材料)的系统和方法。 该系统包括用于获取与特定对象相关的信息的采集子系统,用于将与特定对象相关的获取的信息重建成图像数据的重建子系统,以及适于通过使用差分运算符来识别特定对象的计算机辅助检测子系统 。 该方法包括获得一个对象的图像数据,为图像数据的每个体素计算微分算子,计算每个体素的特征值和特征向量,以及计算特征值的标量函数,以确定每个体素是否代表 一个对象的一部分。

    Reducing noise in an image
    4.
    发明授权
    Reducing noise in an image 有权
    减少图像中的噪音

    公开(公告)号:US08346011B2

    公开(公告)日:2013-01-01

    申请号:US12823377

    申请日:2010-06-25

    IPC分类号: G06K9/40

    摘要: A computer-implemented method for reducing noise in an image includes receiving a first image in a computer system. The first image depicts an interior of an item and is generated using a technique that provides imaging at selected depths in the item. The first image represents a first interior section having a first thickness. The method includes determining a modification for the first image using a second image of the interior. The second image represents a second interior section encompassing the first interior section and has a second thickness greater than the first thickness. The method includes storing the modification in association with the first image.

    摘要翻译: 用于降低图像中的噪声的计算机实现的方法包括在计算机系统中接收第一图像。 第一图像描绘物品的内部并且使用在物品中的选定深度处提供成像的技术生成。 第一图像表示具有第一厚度的第一内部部分。 该方法包括使用内部的第二图像来确定第一图像的修改。 第二图像表示包围第一内部部分并且具有大于第一厚度的第二厚度的第二内部部分。 该方法包括与第一图像相关联地存储修改。

    Magnetic resonance imaging systems and methods for acquiring multi-slice gradient echo images
    5.
    发明授权
    Magnetic resonance imaging systems and methods for acquiring multi-slice gradient echo images 失效
    磁共振成像系统和获取多层梯度回波图像的方法

    公开(公告)号:US06914428B2

    公开(公告)日:2005-07-05

    申请号:US10219883

    申请日:2002-08-15

    IPC分类号: G01R33/54 G01V3/00

    CPC分类号: G01R33/4835

    摘要: Magnetic resonance imaging (“MRI”) systems and methods for acquiring multi-slice gradient echo images having a substantially constant T1-weighting including selecting a first scan having a desired contrast associated with T1-weighting and, given a first repetition time, TR1, and a first flip angle, flip1, associated with the first scan, selecting an effective repetition time, TReff, that provides the desired contrast. The MRI systems and methods also including holding the effective repetition time, TReff, substantially constant in relation to a second scan. The MRI systems and methods further including, given a second repetition time, TR2, determining a second flip angle, flip2, and, given the second flip angle, flip2, determining the second repetition time, TR2. The MRI systems and methods still further including performing the second scan using the second repetition time, TR2, and the second flip angle, flip2, and maximizing a signal-to-noise ratio, S/N, of the second scan.

    摘要翻译: 磁共振成像(“MRI”)系统和方法,用于获取具有基本上恒定的T 1加权的多切片梯度回波图像,包括选择具有与T 1加权相关联的期望对比度的第一扫描,以及给定第一重复时间, TR 1和与第一次扫描相关联的第一翻盖1,选择提供期望对比度的有效重复时间TReff。 MRI系统和方法还包括保持有效重复时间TReff,相对于第二扫描基本上恒定。 MRI系统和方法进一步包括给定第二重复时间TR 2,确定第二翻转角翻转2,并且给定第二翻转角翻转2,确定第二重复时间TR 2。 MRI系统和方法还包括使用第二重复时间TR 2和第二翻转角翻转2执行第二次扫描,并且使第二次扫描的信噪比S / N最大化。