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1. 发明专利

JP2008006117A Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：JP2008006117A
公开(公告)日：2008-01-17
申请号：JP2006180529
申请日：2006-06-30
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： NAGASHIMA KATSUNARI , NAKAI NORIMASA
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54
摘要： PROBLEM TO BE SOLVED: To acquire a high-quality turning removal image with no artifact over a short period of time, without acquiring phase correcting data by a body coil etc., in the reconstitution of image by a parallel imaging method.
SOLUTION: This magnetic resonance imaging apparatus comprises: an RF reception coil which is constituted by combining at least two small-sized RF reception coils for receiving a magnetic nuclear resonance signal; a measurement control means for making each of the small-sized RF reception coils acquire data for sensitivity distribution and data for an image by omitting an encode step for a k-space; and a signal processing means which creates the sensitivity distribution from data for the sensitivity distribution and image data with turning from the data for the image, for each of the small-sized RF reception coils, which performs a turning removal operation for the image data by using the sensitivity distribution, and which acquires data on one image by merging the respective image data together. The signal processing means creates a complex synthetic image from the data for the sensitivity distribution for each of the small-sized RF reception coils, and creates the sensitivity distribution by correcting the phase of a sensitivity image acquired from the data for the sensitivity distribution, through the use of the phase component of the complex synthetic image.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了在通过平行成像方法重建图像的同时，在短时间内获取没有伪像的高质量转向去除图像，而不通过体线圈等获取相位校正数据。解决方案：该磁共振成像装置包括：RF接收线圈，其通过组合至少两个用于接收磁核共振信号的小尺寸RF接收线圈构成; 测量控制装置，用于通过省略k空间的编码步骤，使每个小尺寸RF接收线圈获取用于灵敏度分布的数据和图像数据; 以及信号处理装置，用于针对每个小型RF接收线圈从针对图像的数据转换的灵敏度分布数据和图像数据产生灵敏度分布，该小型RF接收线圈通过以下方式执行图像数据的转向移除操作：使用灵敏度分布，并且通过将各个图像数据合并在一个图像上获取数据。信号处理装置根据用于每个小型RF接收线圈的灵敏度分布的数据创建复合合成图像，并且通过校正从用于灵敏度分布的数据获取的灵敏度图像的相位来创建灵敏度分布，通过使用复合合成图像的相位分量。版权所有（C）2008，JPO＆INPIT

2. 发明专利

JP2013183967A Magnetic resonance imaging apparatus and phase correction method 有权
标题翻译：磁共振成像装置及相位校正方法
公开(公告)号：JP2013183967A
公开(公告)日：2013-09-19
申请号：JP2012052777
申请日：2012-03-09
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： NAKAI NORIMASA
IPC分类号： A61B5/055
摘要： PROBLEM TO BE SOLVED: To create a static magnetic field unevenness map wherein the principal value rotation of a phase is reduced when obtaining, by phase unwrapping processing, a phase rotation amount caused by static magnetic field unevenness by obtaining and correcting the inclination of the phase generated between different TEs with high accuracy so as to obtain an image wherein the counterchanging between water and fat is reduced.SOLUTION: A magnetic resonance imaging apparatus calculates the inclination of a phase generated in images between different echoes by obtaining an average or a weighting average value of differential values of the phase (a phase difference between adjacent pixels). By correcting the inclination of the phase generated in the images between the echoes by the inclination of the phase, the magnetic resonance imaging apparatus reduces the principal value rotation of the phase when obtaining a phase rotation amount by static magnetic field unevenness (a static magnetic field unevenness map) by phase unwrapping processing. Thereby, an image wherein the counterchanging between a water and fat image is reduced can be obtained.
摘要翻译：要解决的问题：为了产生静态磁场不均匀图，其中当通过相位展开处理获得由静态磁场不均匀引起的相位旋转量时相位的主值旋转减小，通过获得和校正相位的倾斜在精度不同的TE之间产生，以获得其中水和脂肪之间的相互变化减小的图像。解决方案：磁共振成像装置通过获得平均或加权平均值来计算在不同回波之间的图像中产生的相位的倾斜度相位的差分值的值（相邻像素之间的相位差）。通过相位倾斜来校正回波之间的图像中产生的相位的倾斜度，磁共振成像装置通过静态磁场不均匀（静态磁场）获得相位旋转量时，减小了相位的主值旋转不平坦图）通过相位展开处理。因此，可以获得减少水和脂肪图像之间的相互转换的图像。

3. 发明专利

JP2006021023A Magnetic resonance diagnostic system 有权
标题翻译：磁共振诊断系统
公开(公告)号：JP2006021023A
公开(公告)日：2006-01-26
申请号：JP2005009382
申请日：2005-01-17
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： MOCHIZUKI HIROYUKI , NAKAI NORIMASA
IPC分类号： A61B5/055 , G01R33/54
摘要： PROBLEM TO BE SOLVED: To provide an excellent image, by eliminating nonuniformity of luminance due to nonuniformity of the spatial sensitivity distribution of an RF (radio frequency) coil, without impairing the shortening effect on imaging time of parallel imaging.
SOLUTION: A sequence control means and an image reconstituting means are controlled so as to perform a sensitivity distribution calculation by using sensitivity data gathered before measurement when performing the measurement, when performing the measurement of a parallel imaging method for performing a cyclical removal calculation generated in measurement data by using the sensitivity distribution of a receiving coil, by performing the measurement by thinning out a phase encode by using the receiving coil having a plurality of small coils. Sensitivity of a reconstituted image is corrected by synthesizing the sensitivity distribution of the whole receiving coils by using the small coil sensitivity distribution used for the cyclical removal calculation.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供优异的图像，通过消除由于RF（射频）线圈的空间灵敏度分布的不均匀性引起的亮度的不均匀性，而不损害对并行成像的成像时间的缩短效果。解决方案：当执行用于执行循环去除的并行成像方法的测量时，控制顺序控制装置和图像重构装置，以便在进行测量时使用测量之前收集的灵敏度数据来执行灵敏度分布计算通过使用接收线圈的灵敏度分布而在测量数据中产生的计算，通过使用具有多个小线圈的接收线圈来稀疏相位编码来进行测量。通过使用用于循环去除计算的小线圈灵敏度分布来合成整个接收线圈的灵敏度分布来校正重构图像的灵敏度。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2008099717A Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：JP2008099717A
公开(公告)日：2008-05-01
申请号：JP2006282103
申请日：2006-10-17
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： NAKAI NORIMASA
IPC分类号： A61B5/055 , G01R33/3415 , G01R33/48
摘要： PROBLEM TO BE SOLVED: To provide an MRI apparatus which prevents the generation of the level difference artifacts of SNR (signal to noise ratio) and signal intensity between a turning removed region and a turning non-removed region in a final image in a parallel imaging method.
SOLUTION: The magnetic resonance imaging apparatus comprises: at least two RF reception coils for receiving nuclear magnetic resonance signals; a measurement control means for acquiring data for sensitivity distribution and data for images by thinning the encode step of k space for each RF reception coil; and a signal processing means for producing a sensitivity distribution from the data for the sensitivity distribution and image data with turning from the data for the images for each RF reception coil, performing the operation of the turning removal of the image data by using the sensitivity distribution, and also combining the respective image data to obtain one piece of the image data. The signal processing means obtains an orthogonal sensitivity distribution from the sensitivity distribution of a turning region and the sensitivity distribution of a region where the turning region is turned and overlapped, and computes the turning removal by using the sensitivity distribution and the orthogonal sensitivity distribution.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种MRI装置，其防止在最终图像中的转向移除区域和转动未去除区域之间产生SNR（信噪比）和信号强度的电平差异赝像并行成像方法。解决方案：磁共振成像装置包括：用于接收核磁共振信号的至少两个RF接收线圈; 测量控制装置，用于通过稀疏每个RF接收线圈的k空间的编码步骤来获取用于图像的灵敏度分布的数据和数据的数据; 以及信号处理装置，用于根据用于每个RF接收线圈的图像的数据从用于灵敏度分布的数据和图像数据产生灵敏度分布，通过使用灵敏度分布执行转移去除图像数据的操作并且还组合各个图像数据以获得一条图像数据。信号处理装置根据转向区域的灵敏度分布和转向区域被转动和重叠的区域的灵敏度分布获得正交灵敏度分布，并且通过使用灵敏度分布和正交灵敏度分布来计算转动去除。版权所有（C）2008，JPO＆INPIT

5. 发明专利

JP2006130285A Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：JP2006130285A
公开(公告)日：2006-05-25
申请号：JP2005003629
申请日：2005-01-11
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： NAKAI NORIMASA
IPC分类号： A61B5/055
摘要： PROBLEM TO BE SOLVED: To restrain a step of S/N and turning artifact in a contour part of a subject in a parallel imaging method.
SOLUTION: In this parallel imaging method, the whole sensitivity image is deformed using a function for recessing in the phase encoding direction, whereby weighting for extrapolation of background area of a sensitivity distribution is converted to reflect the characteristics of the central part of the sensitivity distribution of each coil strongly on extrapolation to improve S/N after matrix calculation and restrain step of S/N. The sensitivity distribution of a subject region is expanded to be taken as the sensitivity distribution of a boundary region between the subject region and the background region, thereby eliminating a step and an error in the sensitivity distribution between the subject region and the background region. Thus, defective turning removal in the boundary between the subject region and the background region is improved.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：以并行成像方法抑制S / N的步骤并在被摄体的轮廓部分中转动人造物。解决方案：在这种并行成像方法中，使用在相位编码方向上凹陷的功能来使整个灵敏度图像变形，由此转换灵敏度分布的背景区域的外推加权，以反映中心部分的特征每个线圈的灵敏度分布强烈地用于外推，以改善矩阵计算后的S / N，并抑制S / N的步长。被摄体区域的灵敏度分布被扩大为被摄体区域和背景区域之间的边界区域的灵敏度分布，从而消除了对象区域和背景区域之间的灵敏度分布的步骤和误差。因此，改善了被摄体区域和背景区域之间的边界中的有缺陷的旋转去除。版权所有（C）2006，JPO＆NCIPI

6. 发明专利

JP2012090867A Magnetic resonance imaging device and chemical image acquisition method 有权
标题翻译：磁共振成像装置和化学图像采集方法
公开(公告)号：JP2012090867A
公开(公告)日：2012-05-17
申请号：JP2010242013
申请日：2010-10-28
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： NAKAI NORIMASA
IPC分类号： A61B5/055 , G01R33/54
摘要： PROBLEM TO BE SOLVED: To provide an MRI device and a chemical image acquisition method, capable of shortening imaging time and reconstruction time and obtaining an image of a high SNR (signal to noise ratio) which does not produce substitution of water and fat in setting short echo time or arbitrary echo time.SOLUTION: Using a chemical shift and a T2 attenuation value for each chemical component in each echo time and a plurality of image data with different echo times, a phase rotation amount by static magnetic field nonuniformity (static magnetic field ununiformity map) in each echo time is obtained. Using the obtained static magnetic filed ununiformity map in each echo time, respective images of a plurality of chemical components are acquired.
摘要翻译：要解决的问题：提供一种能够缩短成像时间和重建时间并获得不产生水的替代的高SNR（信噪比）的图像的MRI装置和化学图像获取方法，脂肪在设置短回波时间或任意回波时间。解决方案：使用每个回波时间内的每个化学成分的化学位移和T2衰减值以及具有不同回波时间的多个图像数据，通过静态磁场不均匀性（静磁场不均匀性图）的相位旋转量获得每个回波时间。在每个回波时间中使用获得的静磁场不均匀图，获得多个化学成分的各自的图像。版权所有（C）2012，JPO＆INPIT

7. 发明专利

JP2009022319A Magnetic resonance imaging device 有权
标题翻译：磁共振成像装置
公开(公告)号：JP2009022319A
公开(公告)日：2009-02-05
申请号：JP2007185279
申请日：2007-07-17
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： KOMORI YOSHIHIRO , NAKAI NORIMASA
IPC分类号： A61B5/055
摘要： PROBLEM TO BE SOLVED: To effectively restrain an artifact even in a low S/N ratio image. SOLUTION: The magnetic resonance imaging device prepares a masking image from an image to which a sensitivity image of a plurality of acquired slices is added by an absolute value. The device obtains sensitivity distribution of a receiving coil having a good S/N ratio and from which a low signal area is efficiently removed by multiplying the masking image obtained by complex addition of acquired slices of the sensitivity image. The device removes reflection from a morphologic image by using the acquired sensitivity distribution. COPYRIGHT: (C)2009,JPO&INPIT

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