公开(公告)号：US20100182007A1

公开(公告)日：2010-07-22

申请号：US12687958

申请日：2010-01-15

Applicant: Melanie Dornhaus ,  Stephan Kannengiesser

Inventor： Melanie Dornhaus ,  Stephan Kannengiesser

IPC: G01R33/48

CPC classification number: G01R33/3875 ,  G01R33/243 ,  G01R33/4835 ,  G01R33/5617 ,  G01R33/56375 ,  G01R33/56383

Abstract: A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus and a method to set shim parameters of a magnetic resonance apparatus, to prepare the implementation of a magnetic resonance examination of a patient with an imaging medical magnetic resonance apparatus having a displaceable patient bed, wherein an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus.Field inhomogeneities are measured while the examination region is moved through the imaging region by a continuous displacement of the patient bed with the patient positioned thereon. Information representing field inhomogeneities (B0 map) is acquired at multiple positions of the patient bed from respective magnetic resonance signals received at these positions. Information representing field inhomogeneities is acquired by excitation of multiple respective slices before the readout of the echo of the first of these slices, with one echo train composed of multiple echoes being generated per excitation signal.Shim parameters of the magnetic resonance apparatus are adjusted dependent on the measured information.A magnetic resonance examination of the examination region is implemented with the apparatus shimmed according to the shim parameters.

Abstract translation: 一种磁共振装置和一种设置磁共振装置的垫片参数的方法能够实现快速，高效，定性高等级的垫片，以准备用具有成像医用磁共振装置的成像医用磁共振装置实施磁共振检查， 可移位的患者床，其中待检查的患者的检查区域大于磁共振设备的成像区域。 当检测区域通过患者定位在其上的患者床的连续移位而移动通过成像区域时，测量场不均匀性。 在患者床的多个位置从在这些位置处接收的各个磁共振信号中获取表示场不均匀性（B0图）的信息。 表示场不均匀性的信息通过在读出第一个这些片的回波之前激励多个相应的片，通过每个激励信号产生由多个回波组成的一个回波串来获取。 根据测量信息调整磁共振设备的Shim参数。 检查区域的磁共振检查是在设备根据垫片参数进行光滑化的情况下进行的。

公开(公告)号：US20070241751A1

公开(公告)日：2007-10-18

申请号：US11406573

申请日：2006-04-18

Applicant: Evgueni Kholmovski ,  Stephan Kannengiesser

Inventor： Evgueni Kholmovski ,  Stephan Kannengiesser

IPC: G01V3/00

CPC classification number: G01R33/5611

Abstract: In a PPA MRT method and apparatus, a selected region of k-space containing respective portions of some of the incomplete, measured data lines and respective portions of some of the complete, reconstructed data lines is designated. For each data line in the selected region, a level of the noise therein is identified. For each reconstructed, complete data line in the selected region, a scaling factor is calculated that is dependent on the noise level in that reconstructed, complete data line and the noise level in at least one neighboring incomplete, measured data line in the selected region. The scaling factor is then applied to the reconstructed, complete data line in question, so that the contribution of that line to the overall reconstructed image is adjusted according to the scaling factor. The scaling factor can be limited dependent on where the selected region is located in k-space.

Abstract translation: 在PPA MRT方法和装置中，指定包含一些不完整测量数据线的各部分的k空间的选定区域以及一些完整的重建数据线的相应部分。 对于所选区域中的每个数据线，识别其中的噪声水平。 对于所选区域中的每个重建的完整数据线，计算取决于该重建的完整数据线中的噪声电平和所选区域中的至少一个相邻不完整测量数据线中的噪声电平的缩放因子。 然后将缩放因子应用于所讨论的重建的完整数据线，使得根据缩放因子来调整该线对整个重建图像的贡献。 缩放因子可以根据所选择的区域在k空间中的位置进行限制。

公开(公告)号：US07265546B2

公开(公告)日：2007-09-04

申请号：US11119478

申请日：2005-04-29

Applicant: Stephan Kannengiesser ,  Thomas Mertelmeier ,  Arnulf Oppelt

Inventor： Stephan Kannengiesser ,  Thomas Mertelmeier ,  Arnulf Oppelt

IPC: G01V3/00

CPC classification number: G01R33/5611

Abstract: In a method and for MR apparatus PPA imaging with radial data acquisition in magnetic resonance tomography, k-space is under-scanned by acquiring a number of projections φ with a coil array of M component coils, a shift operator C(±nΔk) is determined for a projection φi on the basis of measured magnetizations along a projection φi±α0 that encompasses with φi an angle α0, with n=1, 2, . . . , M−1, the shift operator C(±nΔk) is applied to individual points of projection φi in order to obtain calculated projection points, the determination and the application of the shift operator C(±nΔk) are repeated for all projections φ, and an image is reconstructed in the spatial domain on the basis of the projections, which have been completed purely computationally.

Abstract translation: 在磁共振断层成像中利用径向数据采集的方法和MR装置PPA成像中，通过用M个分量线圈的线圈阵列获取多个投影phi，使k空间被扫描，移位运算符C（±nDeltak）为 基于沿着具有角度α0，其中n = 1,2，...包围的投影phi±α0的测量磁化来确定投影phii。 。 。 ，M-1，将移位算子C（±nDeltak）应用于投影phii的各个点，以获得计算的投影点，对于所有投影phi重复移位算子C（±nDeltak）的确定和应用， 并且基于已经完全在计算上完成的投影，在空间域中重建图像。

公开(公告)号：US20060284812A1

公开(公告)日：2006-12-21

申请号：US11409373

申请日：2006-04-21

Applicant: Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

Inventor： Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

IPC: G09G3/36

CPC classification number: G01R33/5611

Abstract: In a method and apparatus for generating a magnetic resonance image of a contiguous region of a human body on the basis of partial parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals indicating the excited spins, the spin excitation is implemented in steps with measurement of an RF response signal simultaneously in each of a number of N component coils. a number of response signals thus are acquired that, for each component coil, form an incomplete data set (40) of acquired RF signals. Additional acquired calibration data points exist for each incomplete data set. The N incomplete data sets are acquired to a subset of M reduced, incomplete data sets on the basis of an N×M reduction matrix, so that M reduced, incomplete data sets are obtained, M complete data sets are formed on the basis of an N×M reconstruction matrix with the non-measured lines of the M reduced, incomplete data sets being reconstructed from all N incomplete data sets. A spatial transformation of the completed reduced data sets is then implemented in order to form a complete image data set from each completed, reduced data set.

Abstract translation: 在通过激励核自旋的部分并行采集（PPA）和表示激发的自旋的射频信号的测量来产生人体的连续区域的磁共振图像的方法和装置中，自旋激发是 在多个N个分量线圈的每一个中同时测量RF响应信号的步骤实现。 因此，对于每个分量线圈，获得多个响应信号，形成所获取的RF信号的不完整数据集（40）。 对于每个不完整的数据集，存在额外的获取的校准数据点。 N个不完整的数据集基于N×M个缩减矩阵被获取到M个不完整的数据集的子集，从而获得M个减少的不完整的数据集，M个完整数据集是基于N×M重建形成的 矩阵，其中M个未测量的线减少，不完整的数据集从所有N个不完整的数据集重建。 然后实现完成的缩减数据集的空间变换，以便从每个完成的简化数据集合形成完整的图像数据集。

公开(公告)号：US07145338B2

公开(公告)日：2006-12-05

申请号：US11126691

申请日：2005-05-11

Applicant: Swen Campagna ,  Martin Harder ,  Peter Heubes ,  Rainer Kaim ,  Stephan Kannengiesser ,  Berthold Kiefer ,  Cecile Mohr ,  Katrin Wohlfarth

Inventor： Swen Campagna ,  Martin Harder ,  Peter Heubes ,  Rainer Kaim ,  Stephan Kannengiesser ,  Berthold Kiefer ,  Cecile Mohr ,  Katrin Wohlfarth

IPC: G01V3/00

CPC classification number: G01R33/58 ,  G01R33/56375

Abstract: In a method for implementation of a magnetic resonance examination of a patient with an imaging medical magnetic resonance apparatus with a movable patient bed, for of an examination volume of the patient that is larger than an acquisition volume of the magnetic resonance apparatus, anatomical patient information and second technical information for setting the magnetic resonance apparatus are acquired dependent on the position of the patient bed from magnetic resonance signals acquired in a low-resolution calibration measurement (scan). A first group of measurement protocol parameters is generated from the patient information and a second group of measurement protocol parameters is generated from the technical information, to generate a measurement protocol for a subsequent high-resolution magnetic resonance examination.

Abstract translation: 在用具有可移动患者床的成像医用磁共振装置实施对患者的磁共振检查的方法中，对于大于磁共振装置的采集体积的患者的检查体积，解剖患者信息 并且根据在低分辨率校准测量（扫描）中获取的磁共振信号，取决于患者床的位置来获取用于设置磁共振设备的第二技术信息。 从患者信息生成第一组测量协议参数，并从技术信息产生第二组测量协议参数，以产生随后的高分辨率磁共振检查的测量协议。

公开(公告)号：US20060261810A1

公开(公告)日：2006-11-23

申请号：US11409353

申请日：2006-04-21

Applicant: Hans-Peter Fautz ,  Stephan Kannengiesser

Inventor： Hans-Peter Fautz ,  Stephan Kannengiesser

IPC: G01V3/00

CPC classification number: G01R33/56375 ,  G01R33/5611 ,  G01R33/56383

Abstract: In a method for magnetic resonance imaging on the basis of a partially-parallel acquisition (PPA) reconstruction method and a magnetic resonance tomography apparatus, data for at least two two-dimensional slices of a patient are acquired (which two-dimensional slices are displaced in the direction of a slice-selection gradient (z-gradients) defining the slice-normal direction) with at least one data acquisition in k-space (which acquisition forms a partial data set) per slice with a number of component coils, with the sum of all partial data sets forming a complete data set in k-space. The coil sensitivities of each component coil are determined on the basis of the complete data set. At least one partial data set of each slice is completed with a PPA reconstruction method on the basis of the determined coil sensitivities. The completed slices in k-space are transformed into whole images in the spatial domain.