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1. 发明专利

JP2002272704A ACOUSTIC GATE MONITOR FOR MAGNETIC RESONANCE IMAGING SYSTEM 审中-公开
公开(公告)号：JP2002272704A
公开(公告)日：2002-09-24
申请号：JP2002002334
申请日：2002-01-09
申请人： TOSHIBA AMERICA MRI INC
发明人： CHANG HSU
IPC分类号： G01R33/48 , A61B5/0456 , A61B5/055 , G01R33/28 , G01R33/567
摘要： PROBLEM TO BE SOLVED: To detect physiological states including heartbeat, blood pulse, respiration imaged in magnetic resonance imaging and convert the parameters to audible sounds. SOLUTION: A magnetic resonance imaging system sends audible feedback signals to a gantry room started by physiological sensors on a patient. Feedback signals are sounds generated by one of MRI gradient magnetic field coils. As sensor output signals show heartbeat or other physiological events of a patient, by applying a non-imaging pulse sequence, sounds to be associated with sensor output signals are issued to the gradient magnetic field coils.

2. 发明专利

JP2000300539A METHOD FOR MAGNETIC RESONANCE IMAGING 失效
公开(公告)号：JP2000300539A
公开(公告)日：2000-10-31
申请号：JP2000094731
申请日：2000-03-30
申请人： TOSHIBA AMERICA MRI INC
发明人： ZHANG WEIGUO
IPC分类号： G01R33/48 , A61B5/055 , G01R33/54 , G01R33/56
摘要： PROBLEM TO BE SOLVED: To provide a method for obtaining post data for forming a separating MR image of water/fat having adjustable relaxation contrast. SOLUTION: Only water, or only fat contrast in an image is adjustable under control by an operator by an MRI method for obtaining post data for forming a water/fat separating MR image. At first, image data are obtd. by a single scan three-point Dixon sequence with a specified MR signal echo time TE. Lead-out inclined magnetic field pulse timing when MRI scan sequence is performed is selected based on difference in chemical shift between water and fat and oil in such a way that signals on water and fat make an angle π between them during interecho time Δ TE. Thereafter, the water/fat separating image whose contrast is changable is formed by reprocessing of the image data obtained by using the value of contrast echo time, newTE being different by selection of the operator when modification for relaxation is performed.

3. 发明专利

JP2000070239A MAGNETIC RESONANCE IMAGING AND MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JP2000070239A
公开(公告)日：2000-03-07
申请号：JP24187899
申请日：1999-08-27
申请人： TOSHIBA AMERICA MRI INC
发明人： ZHANG WEIGUO , DAVID M KRAMER , ANDREW LEIGH
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54 , G01R33/565
摘要： PROBLEM TO BE SOLVED: To make it possible to easily separate water and fat in spite of the presence of the nonuniformity of a magnetostatic field by rewinding a phase value information according to a region expansion phase rewinding method by a multinominal model and determining respective pieces of pixel data in which the water and fat are dominant by using the phase value information rewound according to the specific equation. SOLUTION: The water and fat co-existence MR signal S subjected to Fourie transform can be expressed by equation I in an image frequency region. In the equation, W, F are respectively the water and fat signals, Φ is the signal phase by the influence from the nonuniformity of the magnetostatic field and other systems. The signal phase Φ is quantified by obtaining the argument of the square of the MR signal S of the complex image region in an S (step) 32 and can be mathematically expressed by equation II. In the equation, arg S2} is the operation to repeat the phase of the input signal. Discrimination as to whether the phase rewinding is necessary or not is executed in S33 and the region expansion algorithm by a multinominal model is used for the phase rewinding in S34. When the rewinding phase Φ is once obtd. in S35, the pixel (Iwater-pixel) of the water the (Ifat-pixel) of the fat are calculated in S36 in accordance with equations III, IV.

4. 发明专利

JP2006280930A Method and system for magnetic field map during ssfp using phase-incremented or frequency-shifted magnitude image 有权
标题翻译：使用相位增益或频率偏移图像在SSFP期间的磁场映射的方法和系统
公开(公告)号：JP2006280930A
公开(公告)日：2006-10-19
申请号：JP2006091445
申请日：2006-03-29
申请人： Toshiba America Mri Inc , トーシバアメリカエムアールアイインコーポレイテッドToshiba America Mri, Inc.
发明人： ZHANG WEIGUO
IPC分类号： A61B5/055 , G01R33/48
CPC分类号： G01R33/56563 , G01R33/5613
摘要： PROBLEM TO BE SOLVED: To provide a method for forming magnetic field maps that are relevant to the imaging sequences, wherein the maps are not much affected by a chemical shift.
SOLUTION: A magnetic resonance imaging system generates the magnetic field maps during a steady-state free precession (SSFP) sequence. The system is provided with programmed controllers 17, 18 connected to RF coils 15, 16 and a gradient magnetic field coil 14 via a relating circuit to carry out an imaging sequence of the balanced SSFP imaging sequences with phase increment or frequency shift and to collect an SSFP data set on a k-space, and a data processor 19 for processing corrected the SSFP data to generate the magnetic field maps and generating the magnetic field maps by converting data on the k-space to images and analyzing the magnitude of images.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于形成与成像序列相关的磁场图的方法，其中所述图不受化学位移的太大影响。解决方案：磁共振成像系统在稳态自由进动（SSFP）序列期间产生磁场图。该系统具有经由相关电路连接到RF线圈15,16和梯度磁场线圈14的编程控制器17,18，以执行具有相位增量或频移的平衡SSFP成像序列的成像序列，并收集在k空间上设置的SSFP数据，以及数据处理器19，用于处理校正的SSFP数据以产生磁场映射，并通过将k空间上的数据转换为图像并分析图像的大小来生成磁场映射。版权所有（C）2007，JPO＆INPIT

5. 发明专利

JP2004242771A Preconditioning of sequence for ultra-high speed magnetic resonance imaging 有权
公开(公告)号：JP2004242771A
公开(公告)日：2004-09-02
申请号：JP2003033724
申请日：2003-02-12
申请人： Toshiba America Mri Inc , トーシバアメリカエムアールアイインコーポレイテッドToshiba America Mri, Inc.
发明人： ZHANG WEIGUO
IPC分类号： G01R33/54 , A61B5/055 , G01R33/48
摘要： PROBLEM TO BE SOLVED: To provide a method to correct actual measurement data by preconditioning of a pulse sequence of ultra-high speed MRI.
SOLUTION: An improved method of the magnetic resonance imaging is that, a sequence diagnostic parameter is formed by using a first shortened MRI sequence, and the sequence diagnostic parameter which has a certain relation with a particular sequence conditioning parameter is used for calculation of the feature value of the sequence conditioning parameter. A sequence of a read-out gradient pulse is altered according to the calculated feature value of the sequence conditioning parameter, and then, the altered sequence of the read-out gradient pulse is adopted in the next MRI pulse sequence and used for obtaining a diagnostic image. The above method is particularly applied to a so-called ultra-high speed MRI processing wherein echo-planar imaging (EPI) and echo-volume imaging (EVI) are included.
COPYRIGHT: (C)2004,JPO&NCIPI

6. 发明专利

JP2001137215A CHARACTERISTIC UNCOUPLED SANDWICH SOLENOID ARRAY COIL 失效
公开(公告)号：JP2001137215A
公开(公告)日：2001-05-22
申请号：JP2000298509
申请日：2000-09-29
申请人： TOSHIBA AMERICA MRI INC
发明人： SUNYU SU , KAUFMAN LEON , ARAKAWA MITSUAKI , CARLSON JOSEPH W
IPC分类号： G01R33/34 , A61B5/055 , G01R33/3415
摘要： PROBLEM TO BE SOLVED: To provide an array of essentially uncoupled receiving coils used for both horizontal and vertical field MRI systems and having high efficiency, high sensitivity and good uniformity. SOLUTION: A sandwich array coil 1 is an array of radio frequency(RF) sensitive coils 2 with at least two solenoid RF receiving coils 1a and 1b, and one of the coil antennas thereof is arranged in such a manner as to be coaxially surrounded between two solenoid portions separated from each other in the direction of the axis of a second coil, that is, sandwiched therebetween, with the separated portions of the second coil having conductive windings in opposite directions. Because of this 'sandwich' structure and a unique arrangement of opposite (field packing) windings, the two RF coils 1a and 1b of the array are essentially uncoupled from each other.

7. 发明专利

JP2000241519A RF COIL ARRAY DEVICE FOR VERTICAL MAGNETIC FIELD MRI 失效
公开(公告)号：JP2000241519A
公开(公告)日：2000-09-08
申请号：JP2000039434
申请日：2000-02-17
申请人： TOSHIBA AMERICA MRI INC
发明人： ARAKAWA MITSUAKI , CARLSON JOSEPH W , KAUFMAN LEON , JAMES V LEBOW
IPC分类号： A61B5/055 , G01R33/34 , G01R33/3415 , G01R33/38
摘要： PROBLEM TO BE SOLVED: To obtain a device that is suitable for the imaging of the chest or the chest region of a specimen by making the central axis of a loop-type coil parallel with the direction of the main magnetic field of a magnetic resonance imaging device of a vertical magnetic field system. SOLUTION: A main static magnetic field generation magnet 20 is arranged in space for surrounding a specimen 10 and gives a uniform, strong vertical magnetic field to the specimen 10. The output of an inclination magnetic field generation unit 40 forms three inclined magnetic fields corresponding to each of X, Y, and Z directions that orthogonally cross one another. A nuclear magnetic resonance(NMR) signal from the specimen 10 is picked up by an RF coil 61 and then is detected by a high-frequency reception unit 60. A control unit 90 adjusts timing, the application of an inclined magnetic field, and the transmission and reception of an RF signal to RF coils 51 and 61. NMR signal output from the high-frequency reception unit 60 is stored, and at the same time is subjected to Fourier transform processing, thus obtaining image information for displaying on a display device 80.

8. 发明专利

JPH114818A MAGNETIC RESONANCE IMAGING DEVICE 失效
公开(公告)号：JPH114818A
公开(公告)日：1999-01-12
申请号：JP11728298
申请日：1998-04-27
申请人： TOSHIBA AMERICA MRI INC
发明人： AVRAM HECTOR E , WAGNER ROBERT , KAUFMAN LEON , LI ANDREW
IPC分类号： G01R33/48 , A61B5/055 , G01R33/561 , G01N33/48
摘要： PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging device having a sequence in which shared echo imaging method is combined with half-Fourier transform method. SOLUTION: Half-Fourier transform complex conjugate contributes to a reduction in data acquisition time, and data acquisition per scan can be performed by a single RF transmission loop. Shared echo imaging method can impart different contrasts to multiple images on one image screen through one scan or obtain a number of slices. In a deformed embodiment, phase correction between unshared echo responses is provided.

9. 发明专利

JP2007117765A Measurement and correction of gradient-induced cross-term magnetic fields in epi sequence 审中-公开
标题翻译：坡度序列中梯度诱导的交叉磁场的测量和校正
公开(公告)号：JP2007117765A
公开(公告)日：2007-05-17
申请号：JP2007029269
申请日：2007-02-08
申请人： Toshiba America Mri Inc , トーシバアメリカエムアールアイインコーポレイテッドToshiba America Mri, Inc.
发明人： ZHANG WEIGUO
IPC分类号： A61B5/055 , G01R33/54 , G01R33/48 , G01R33/561 , G01R33/565
CPC分类号： G01R33/56554 , G01R33/56518 , G01R33/56563
摘要： PROBLEM TO BE SOLVED: To measure and correct a gradient-induced cross-term magnetic field in an echo planar imaging (EPI) sequence, relating to magnetic resonance imaging (MRI), especially to a high speed EPI technique.
SOLUTION: The method for determining the gradient-induced cross-term magnetic field in a magnetic resonance imaging (MRI) system, includes processes of: positioning an examined body (object) in a static magnetic field; applying a radio frequency (RF) excitation pulse for spatially selecting a slice of the object; applying an incremented phase encode gradient magnetic field along a phase encoding gradient magnetic field direction parallel to the slice phase; applying a selective RF refocusing pulse to select a line (linear portion) in the slice; applying a switched readout magnetic field gradient, which causes the cross-term magnetic field; generating a data array of a phase-encoding gradient and a corresponding sample data point along the selected line; and determining a center frequency distribution (CF) for the selected line, which indicates the gradient induced cross-term magnetic field.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：测量和校正与磁共振成像（MRI）有关的回波平面成像（EPI）序列中的梯度诱发的交叉磁场，特别是对于高速EPI技术。解决方案：用于确定磁共振成像（MRI）系统中的梯度诱发的交叉磁场的方法包括以下过程：将被检体（物体）定位在静磁场中; 施加射频（RF）激励脉冲，用于空间选择所述物体的切片; 沿着平行于切片相位的相位编码梯度磁场方向施加递增的相位编码梯度磁场; 应用选择性RF重聚焦脉冲来选择切片中的线（线性部分）; 施加切换读出磁场梯度，其导致交叉磁场; 沿所选择的线生成相位编码梯度的数据阵列和对应的样本数据点; 并确定所选行的中心频率分布（CF），其指示梯度诱导的交叉磁场。版权所有（C）2007，JPO＆INPIT

10. 发明专利

JP2007068996A Method and apparatus for diffusion magnetic resonance imaging 有权
标题翻译：用于扩散磁共振成像的方法和装置
公开(公告)号：JP2007068996A
公开(公告)日：2007-03-22
申请号：JP2006233222
申请日：2006-08-30
申请人： Toshiba America Mri Inc , トーシバアメリカエムアールアイインコーポレイテッドToshiba America Mri, Inc.
发明人： ZHANG WEIGUO , DAVID M KRAMER
IPC分类号： A61B5/055 , G01R33/48
CPC分类号： G01R33/56341
摘要： PROBLEM TO BE SOLVED: To easily and quickly measure the effects of eddy currents.
SOLUTION: The system is equipped with a magnet 10 applying a static magnetic field, an electromagnetic gradient coils 14, an RF coil 15, a pulse sequence controller 19, and a programmable processor 24. The programmable processor determines eddy current parameters which characterizes the effect of the eddy currents induced by diffusion weighting gradient pulses from prescan projection data, adjusts a second sequence having diffusion weighting segments and image acquisition segments, acquires diffusion weighting image data by performing the adjusted second sequence, and generates an image by processing the acquired diffusion weighting image data.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：轻松快速地测量涡流的影响。解决方案：系统配备有施加静磁场的磁体10，电磁梯度线圈14，RF线圈15，脉冲序列控制器19和可编程处理器24.可编程处理器确定涡流参数，其中表征来自预扫描投影数据的扩散加权梯度脉冲引起的涡流的影响，调整具有扩散加权段和图像采集段的第二序列，通过执行调整后的第二序列获取扩散加权图像数据，并通过处理获得扩散加权图像数据。版权所有（C）2007，JPO＆INPIT

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