利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

10 条记录 (耗时 0.03 秒)

    Non-Contrast-Enhanced 4D MRA Using Compressed Sensing Reconstruction
    1.
    发明申请
    Non-Contrast-Enhanced 4D MRA Using Compressed Sensing Reconstruction 有权
    使用压缩感知重建的非对比度增强型4D MRA

    公开(公告)号：US20130121550A1

    公开(公告)日：2013-05-16

    申请号：US13284143

    申请日：2011-10-28

    申请人： Ti-chiun Chang ,  Mariappan S. Nadar ,  Jens Gühring ,  Michael Zenge ,  Kai Tobias Block ,  Peter Schmitt ,  Edgar Mueller

    发明人： Ti-chiun Chang ,  Mariappan S. Nadar ,  Jens Gühring ,  Michael Zenge ,  Kai Tobias Block ,  Peter Schmitt ,  Edgar Mueller

    IPC分类号： G06T11/00 ,  A61B5/055

    CPC分类号： G06T11/003 ,  A61B5/055 ,  G01R33/561 ,  G01R33/5635 ,  G01R33/56545

    摘要： A reconstructed image is rendered of a patient by a processor from a set of undersampled MRI data by first subtracting two repetitions of the acquired data in k-space to create a third dataset. The processor reconstructs the image by minimizing an objective function under a constraint related to the third dataset, wherein the objective function includes applying a Karhunen-Loeve Transform (KLT) to a temporal dimension of data. The objective function under the constraint is expressed as arg minf{∥φ(f)∥1 subject to ∥Af−y∥2≦ε}. The reconstructed image is an angiogram which may be a 4D angiogram. The angiogram is used to diagnose a vascular disease.

    摘要翻译： 通过首先在k空间中减去所获取的数据的两次重复以创建第三数据集，由处理器从一组欠采样的MRI数据中呈现患者的重建图像。 处理器通过在与第三数据集相关的约束下最小化目标函数来重建图像，其中目标函数包括将Karhunen-Loeve变换（KLT）应用于数据的时间维度。 约束下的目标函数表示为arg minf {∥phi（f）‖1，受∥Af-y‖2@ epsilon}的限制。 重建的图像是可以是4D血管造影的血管造影。 血管造影用于诊断血管疾病。

    METHOD TO SELECT AN UNDERSAMPLING SCHEME FOR MAGNETIC RESONANCE IMAGING, AND MAGNETIC RESONANCE IMAGING METHOD AND SYSTEM USING SUCH A SELECTED UNDERSAMPLING SCHEME
    5.
    发明申请
    METHOD TO SELECT AN UNDERSAMPLING SCHEME FOR MAGNETIC RESONANCE IMAGING, AND MAGNETIC RESONANCE IMAGING METHOD AND SYSTEM USING SUCH A SELECTED UNDERSAMPLING SCHEME 有权
    选择用于磁共振成像的不完善方案的方法和使用这种选择的下列方案的磁共振成像方法和系统

    公开(公告)号：US20130076352A1

    公开(公告)日：2013-03-28

    申请号：US13627042

    申请日：2012-09-26

    申请人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

    发明人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

    IPC分类号： G01R33/58 ,  G01R33/341

    CPC分类号： G01R33/5611

    摘要： In a method to select an undersampling scheme of k-space and an associated set of reconstruction kernels to acquire reduced magnetic resonance (MR) data sets with multiple coils, a calibration data set is acquired for each of the respective coils, a noise covariance is determined from autocorrelations and correlations of the noise of the various coils. At least one set of reconstruction kernels is calculated for each of the multiple undersampling schemes from the calibration data sets of the various coils. For each set of reconstruction kernels, a characteristic value is calculated from the noise covariance and the respective reconstruction kernels of the coils, with the characteristic value being proportional to a spatial mean value of a signal noise of an MR image. A selected undersampling scheme and a selected set of reconstruction kernels are selected based on the calculated characteristic values.

    摘要翻译： 在选择k空间的欠采样方案和相关联的一组重建内核以获取具有多个线圈的减小的磁共振（MR）数据集的方法中，针对各个线圈获取校准数据集，噪声协方差为 根据各种线圈的噪声的自相关性和相关性确定。 根据各种线圈的校准数据集，对于多个欠采样方案中的每一个计算至少一组重构内核。 对于每组重建内核，根据噪声协方差和线圈的相应重建内核计算特征值，其特征值与MR图像的信号噪声的空间平均值成比例。 基于所计算的特征值来选择所选的欠采样方案和所选择的重构内核集合。

    Method to select an undersampling scheme for magnetic resonance imaging, and magnetic resonance imaging method and system using such a selected undersampling scheme
    6.
    发明授权
    Method to select an undersampling scheme for magnetic resonance imaging, and magnetic resonance imaging method and system using such a selected undersampling scheme 有权
    选择用于磁共振成像的欠采样方案的方法，以及使用这种选择的欠采样方案的磁共振成像方法和系统

    公开(公告)号：US09297873B2

    公开(公告)日：2016-03-29

    申请号：US13627042

    申请日：2012-09-26

    申请人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

    发明人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

    IPC分类号： G01R33/561

    CPC分类号： G01R33/5611

    摘要： In a method to select an undersampling scheme of k-space and an associated set of reconstruction kernels to acquire reduced magnetic resonance (MR) data sets with multiple coils, a calibration data set is acquired for each of the respective coils, a noise covariance is determined from autocorrelations and correlations of the noise of the various coils. At least one set of reconstruction kernels is calculated for each of the multiple undersampling schemes from the calibration data sets of the various coils. For each set of reconstruction kernels, a characteristic value is calculated from the noise covariance and the respective reconstruction kernels of the coils, with the characteristic value being proportional to a spatial mean value of a signal noise of an MR image. A selected undersampling scheme and a selected set of reconstruction kernels are selected based on the calculated characteristic values.

    摘要翻译： 在选择k空间的欠采样方案和相关联的一组重建内核以获取具有多个线圈的减小的磁共振（MR）数据集的方法中，针对各个线圈获取校准数据集，噪声协方差为 根据各种线圈的噪声的自相关性和相关性确定。 根据各种线圈的校准数据集，对于多个欠采样方案中的每一个计算至少一组重构内核。 对于每组重建内核，根据噪声协方差和线圈的相应重建内核计算特征值，其特征值与MR图像的信号噪声的空间平均值成比例。 基于所计算的特征值来选择所选的欠采样方案和所选择的重构内核集合。

    AUTOMATIC BOLUS DETECTION
    7.
    发明申请
    AUTOMATIC BOLUS DETECTION 审中-公开
    自动检测

    公开(公告)号：US20150226815A1

    公开(公告)日：2015-08-13

    申请号：US14178741

    申请日：2014-02-12

    申请人： Kai Tobias Block ,  Robert Grimm ,  Marcel Dominik Nickel

    发明人： Kai Tobias Block ,  Robert Grimm ,  Marcel Dominik Nickel

    IPC分类号： G01R33/28 ,  G01R33/48 ,  A61B5/055

    CPC分类号： A61B5/055 ,  A61B5/7289 ,  G01R33/4826 ,  G01R33/5601 ,  G01R33/56366

    摘要： In a method for automatically detecting contrast enhancement at predetermined phases as a contrast agent bolus perfuses a target tissue volume in a patient, a continuous acquisition MRI imaging system is provided for obtaining dynamic contrast enhanced MRI data for use in creating images. The contrast agent bolus is injected into a blood stream of the patient which passes through the target volume. With the imaging system, a center of a k-space of the target volume is repeatedly sampled to obtain k-space data. A bolus time curve signal is automatically extracted from the k-space data which indicates a course of bolus contrast enhancement which is used to automatically pick time frames at the predetermined phases of the perfusion which are then used to identify corresponding key images to be obtained at the time frames.

    摘要翻译： 在用于自动检测在预定阶段的对比度增强作为造影剂推注灌注患者中的目标组织体积的方法中，提供连续采集MRI成像系统以获得用于创建图像的动态对比度增强MRI数据。 将造影剂推注注射到穿过目标体积的患者的血液流中。 利用成像系统，重复采样目标体积的k空间的中心以获得k空间数据。 从k空间数据中自动提取推注时间曲线信号，该空间数据指示用于在灌注的预定阶段自动选择时间帧的快速对比度增强过程，然后使用该时间帧来识别将在 时间框架。

    Magnetic resonance system and method to generate a magnetic resonance image of an examination subject
    8.
    发明授权
    Magnetic resonance system and method to generate a magnetic resonance image of an examination subject 有权
    用于产生检查对象的磁共振图像的磁共振系统和方法

    公开(公告)号：US09297871B2

    公开(公告)日：2016-03-29

    申请号：US13714837

    申请日：2012-12-14

    申请人： Kai Tobias Block ,  Matthias Fenchel

    发明人： Kai Tobias Block ,  Matthias Fenchel

    IPC分类号： G01V3/00 ,  G01R33/48 ,  G06F17/40 ,  G01R33/483 ,  G01R33/565 ,  G01R33/3415

    CPC分类号： G01R33/48 ,  G01R33/3415 ,  G01R33/4816 ,  G01R33/4824 ,  G01R33/4838 ,  G01R33/56545 ,  G06F17/40

    摘要： The invention concerns a method to generate an MR image of an examination subject of MR signals of the examination subject being detected with a receiver coil element of a magnetic resonance system. A spatially related sensitivity is determined for the receiver coil element. A mask is generated for the receiver coil element depending on the sensitivity of the receiver coil element in order to therewith mask a region of the MR image, in which region the receiver coil element has at least one predetermined sensitivity. At least one RF excitation pulse and at least one magnetic field gradient are activated to acquire MR data with the receiver coil element, and a preliminary MR image is generated depending on MR data acquired therewith. The mask of the receiver coil element is applied to the preliminary MR image in order to generate an MR image of the receiver coil element, and an MR image of the examination subject is generated from the MR image for the receiver coil element.

    摘要翻译： 本发明涉及一种利用磁共振系统的接收器线圈元件检测检查对象的MR信号的检查对象的MR图像的方法。 确定接收器线圈元件的空间相关灵敏度。 根据接收器线圈元件的灵敏度，为接收器线圈元件产生掩模，以便掩蔽MR图像的区域，其中接收器线圈元件具有至少一个预定灵敏度。 至少一个RF激励脉冲和至少一个磁场梯度被激活以用接收器线圈元件获取MR数据，并且根据由其获取的MR数据来生成初步MR图像。 将接收器线圈元件的掩模施加到初步MR图像，以便产生接收器线圈元件的MR图像，并且从用于接收器线圈元件的MR图像生成检查对象的MR图像。

    Magnetic resonance system and method to create a magnetic resonance image data set by radial scanning of a magnetic resonance system
    9.
    发明授权
    Magnetic resonance system and method to create a magnetic resonance image data set by radial scanning of a magnetic resonance system 有权
    磁共振系统和通过磁共振系统的径向扫描产生磁共振图像数据的方法

    公开(公告)号：US08493067B2

    公开(公告)日：2013-07-23

    申请号：US13070962

    申请日：2011-03-24

    申请人： Kai Tobias Block

    发明人： Kai Tobias Block

    IPC分类号： G01V3/00

    CPC分类号： G01R33/4824 ,  A61B5/055 ,  A61B5/7257

    摘要： In a magnetic resonance apparatus and method to generate an image data set by means of a radial scanning of a raw data set, at least one calibration measurement is implemented for at least one predetermined spoke of the radial scan, and a gradient moment difference between an assumed gradient moment and an actually applied gradient moment is determined along the at least one predetermined spoke. Readout of all spokes of the predetermined raw data set ensues by activating multiple magnetic field gradients in spatial directions in order to respectively read out scan points of a respective spoke. The position of each scan point of each spoke is corrected depending on the gradient moment difference, by the position of the respective scan point that is assumed based on the respective activated magnetic field gradients being shifted by the gradient moment difference.

    摘要翻译： 在通过原始数据集的径向扫描生成图像数据集的磁共振装置和方法中，对于径向扫描的至少一个预定轮辐实施至少一个校准测量，并且在 沿着至少一个预定辐条确定假定的梯度力矩和实际应用的梯度力矩。 通过在空间方向上激活多个磁场梯度来读出预定原始数据集的所有辐条，以便分别读取相应辐条的扫描点。 每个辐条的每个扫描点的位置根据梯度力矩差异，根据相应的激活磁场梯度被偏移了梯度力矩差而假设的相应扫描点的位置来校正。

    MAGNETIC RESONANCE SYSTEM AND METHOD TO GENERATE A MAGNETIC RESONANCE IMAGE OF AN EXAMINATION SUBJECT
    10.
    发明申请
    MAGNETIC RESONANCE SYSTEM AND METHOD TO GENERATE A MAGNETIC RESONANCE IMAGE OF AN EXAMINATION SUBJECT 有权
    磁共振系统和生成检查对象的磁共振图像的方法

    公开(公告)号：US20130154640A1

    公开(公告)日：2013-06-20

    申请号：US13714837

    申请日：2012-12-14

    申请人： Kai Tobias Block ,  Matthias Fenchel

    发明人： Kai Tobias Block ,  Matthias Fenchel

    IPC分类号： G01R33/48 ,  G06F17/40

    CPC分类号： G01R33/48 ,  G01R33/3415 ,  G01R33/4816 ,  G01R33/4824 ,  G01R33/4838 ,  G01R33/56545 ,  G06F17/40

    摘要： The invention concerns a method to generate an MR image of an examination subject of MR signals of the examination subject being detected with a receiver coil element of a magnetic resonance system. A spatially related sensitivity is determined for the receiver coil element. A mask is generated for the receiver coil element depending on the sensitivity of the receiver coil element in order to therewith mask a region of the MR image, in which region the receiver coil element has at least one predetermined sensitivity. At least one RF excitation pulse and at least one magnetic field gradient are activated to acquire MR data with the receiver coil element, and a preliminary MR image is generated depending on MR data acquired therewith. The mask of the receiver coil element is applied to the preliminary MR image in order to generate an MR image of the receiver coil element, and an MR image of the examination subject is generated from the MR image for the receiver coil element.

    摘要翻译： 本发明涉及一种利用磁共振系统的接收器线圈元件检测检查对象的MR信号的检查对象的MR图像的方法。 确定接收器线圈元件的空间相关灵敏度。 根据接收器线圈元件的灵敏度，为接收器线圈元件产生掩模，以便掩蔽MR图像的区域，其中接收器线圈元件具有至少一个预定灵敏度。 至少一个RF激励脉冲和至少一个磁场梯度被激活以用接收器线圈元件获取MR数据，并且根据由其获取的MR数据来生成初步MR图像。 将接收器线圈元件的掩模施加到初步MR图像，以便产生接收器线圈元件的MR图像，并且从用于接收器线圈元件的MR图像生成检查对象的MR图像。