公开(公告)号：US5089784A

公开(公告)日：1992-02-18

申请号：US499449

申请日：1990-06-22

申请人： Eiji Yoshitome ,  Susumu Kosugi

发明人： Eiji Yoshitome ,  Susumu Kosugi

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/54 ,  G01R33/56

CPC分类号： G01R33/4833 ,  G01R33/56

摘要： The method for restricting a region for magnetic resonance imaging, in accordance with the present invention, comprisinga step of measuring a spin-echo signal from an object by a pulse sequence of Fourier transformation technique;a step of measuring a spin-echo signal from an object by a pulse sequence comprising adding a selective 180.degree..+-.x pulse and a selective 180.degree..+-.y pulse following a 180.degree. pulse in the pulse sequence of Fourier transform technique, the integral of gradient magnetic fields for selection thereof being 0; anda step of reconstructing an image from the addition or subtraction between the spin-echo signals measured by the two sequences.

公开(公告)号：US5732701A

公开(公告)日：1998-03-31

申请号：US581821

申请日：1996-01-02

申请人： Eiji Yoshitome ,  Yoshikazu Ikezaki

发明人： Eiji Yoshitome ,  Yoshikazu Ikezaki

IPC分类号： A61B5/055 ,  G01R33/54

CPC分类号： G01R33/54 ,  A61B5/055

摘要： A data collection method for MR angiography, wherein the scans resulting in spin warp values are assigned into groups of two or more consecutive acquisitions and each group is averaged two or more times for each heart beat period, whereby data collection time is reduced concurrently with suppression of motion artifacts, all without use of additional hardware.

摘要翻译： 用于MR血管造影的数据收集方法，其中产生自旋扭曲值的扫描被分配为两个或更多个连续采集的组，并且每个组对于每个心跳周期平均两次或更多次，由此数据收集时间与抑制同时降低 的运动伪影，都不用额外的硬件。

公开(公告)号：US4694251A

公开(公告)日：1987-09-15

申请号：US840570

申请日：1986-02-21

申请人： Eiji Yoshitome ,  Kazuya Hoshino

发明人： Eiji Yoshitome ,  Kazuya Hoshino

IPC分类号： G01R33/24 ,  A61B5/055 ,  A61B10/00 ,  G01R33/48 ,  G01R33/54 ,  G01R33/56 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/482 ,  G01R33/56 ,  G01R33/56563

摘要： A method and apparatus are disclosed for nuclear magnetic resonance imaging utilizing the Fourier transform imaging scan sequence, with measurement data being obtained from which the offects of variations in the static magnetic field are eliminated. The method and apparatus are characterized by measurement of view data G(k,t) for a body which is under diagnosis under the condition that there is a specific value of twist of spin phase within the body, in a specific direction, measurement of the view data G(-k,t) for the body which is under diagnosis under the condition that the value of twist of the spin phase within the body is equal in amount and of opposite direction to the aforementioned value of twist of spin phase, with the time which elapses between the measurements of G(k,t) and G(-k,t) being made sufficiently short that any change in the static magnetic field occurring therein can be ignored, deriving from the view data G(k,t) and G(-k,t) the data G(k,t.sub.0) and G(-k,-t.sub.0), for the respective time points t.sub.0 and -t.sub.0 which are mutually symmetrically disposed with respect to the time origin, deriving the complex conjugate G(-k,-t.sub.0) of the data G(-k,-t.sub.0), deriving the ratio A which is equal to G(k,t.sub.0)/G(-k,-t.sub.0), and correcting measured data by a signal which is proportional to the argument arg(A) of the ratio A.

摘要翻译： PCT No.PCT / JP85 / 00370 Sec。 371日期1986年2月21日 102（e）日期1986年2月21日PCT提交1985年7月2日PCT公布。 出版物WO86 / 00706 日本1986年1月30日。公开了利用傅里叶变换成像扫描序列进行核磁共振成像的方法和装置，其中获得了测量数据，从而消除了静态磁场的变化。 该方法和装置的特征在于，在身体内具有特定方向的自旋相位扭曲的特定值的条件下，对正在诊断的身体的视图数据G（k，t）进行测量， 在身体内的自旋相位的扭曲量相等于与上述旋转相位扭曲的方向相反的条件下，对正在诊断的身体的视图数据G（-k，t）与 在G（k，t）和G（-k，t）的测量之间经过的时间足够短，使得其中发生的静态磁场的任何变化可以被忽略，从视图数据G（k，t ）和G（-k，t）对于相对于时间原点相互对称布置的各个时间点t0和-t0的数据G（k，t0）和G（-k，-t0），导出 数据G（-k，-t0）的复共轭＆upbar＆G（ - ＆upbar＆k， - ＆upbar＆t0），导出等于G（k，t0）/ u pbar＆G（ - ＆upbar＆k， - ＆upbar＆t0），并且通过与比率A的参数arg（A）成比例的信号来校正测量数据。

公开(公告)号：US4644279A

公开(公告)日：1987-02-17

申请号：US717523

申请日：1985-03-29

申请人： Kazuya Hoshino ,  Noriaki Yamada ,  Eiji Yoshitome ,  Tadashi Sugiyama ,  Hiroyuki Matsuura

发明人： Kazuya Hoshino ,  Noriaki Yamada ,  Eiji Yoshitome ,  Tadashi Sugiyama ,  Hiroyuki Matsuura

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/24 ,  G01R33/38 ,  G01R33/385 ,  G01R33/389 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/381 ,  G01R33/24 ,  G01R33/389 ,  G01R33/56563

摘要： After spins in a subject being examined have been selectively excited, the application of gradient magnetic fields is interrupted to produce an FID signal. The intensity of the primary magnetic field is determined based on the central frequency of the Fourier spectrum of the FID signal, i.e., the Larmor frequency. The primary magnetic field is controlled or the observed data is corrected, according to the measured value of the primary magnetic field intensity.

摘要翻译： 在被检查对象中的旋转已被选择性地激发之后，中断梯度磁场的施加以产生FID信号。 基于FID信号的傅立叶频谱的中心频率即拉莫尔频率来确定初级磁场的强度。 根据初级磁场强度的测量值，控制主磁场或观察数据的校正。

公开(公告)号：US06242914B1

公开(公告)日：2001-06-05

申请号：US09288110

申请日：1999-04-08

申请人： Eiji Yoshitome

发明人： Eiji Yoshitome

IPC分类号： G01V300

CPC分类号： G01R33/5615 ,  G01R33/5616 ,  G01R33/56554

摘要： A method and a system for magnetic resonance imaging using echo planar method enable obtaining MRI images reduced in ghost artifacts. The magnetic resonance imaging system realizing the magnetic resonance imaging method includes a gradient coil for fast switching (inverting) a gradient magnetic field in a magnetostatic field applied to an object to be analyzed by a magnetostatic field generator, a receiver for receiving magnetic resonant signals from atomic nuclei of the object to be analyzed as echo signals necessary for filling a k-space, k-space data developer for developing the signals converted into a digital form over the a k-space as echo data, data collector for collecting echo data of the same phase encoding data in two frequency encoding directions for about half the k-space, and imager for making an image by classifying the echo data by frequency encoding direction, performing Fourier transformation separately to obtain images, and adding absolute number processed images to improve S/N.

摘要翻译： 使用回波平面方法的磁共振成像的方法和系统能够获得在鬼影中减少的MRI图像。 实现磁共振成像方法的磁共振成像系统包括：梯度线圈，用于快速切换（反转）施加到由静磁场发生器分析的物体的静磁场中的梯度磁场;接收器，用于接收来自 要分析的对象的原子核作为填充k空间所需的回波信号，k空间数据开发者用于开发在k空间上转换成数字形式的信号作为回波数据，用于收集回波数据的数据收集器 在两个频率编码方向上相同的相位编码数据大约是k空间的一半，以及通过频率编码方向对回波数据进行分类来制作图像的成像器，分别执行傅里叶变换以获得图像，并且添加绝对数量处理的图像以改善 S / N。

公开(公告)号：US4894616A

公开(公告)日：1990-01-16

申请号：US251213

申请日：1988-09-27

申请人： Eiji Yoshitome ,  Kazuya Hoshino ,  Susumu Kosugi

发明人： Eiji Yoshitome ,  Kazuya Hoshino ,  Susumu Kosugi

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/483

CPC分类号： G01R33/4838

摘要： An improved selective excitation method applicable to NMR imaging, regardless of the NMR signal generation method used, wherein a non-scanned subject area is excited using an RF signal, then the excited area is spoiled with a gradient magnetic field to create an area that receives no other excitation RF signal for a set period, and then NMR signals are collected from the unspoiled area using a conventional method.

公开(公告)号：US5751782A

公开(公告)日：1998-05-12

申请号：US636797

申请日：1996-04-22

申请人： Eiji Yoshitome

发明人： Eiji Yoshitome

IPC分类号： A61B6/00 ,  A61B6/03 ,  H05G1/64

CPC分类号： A61B6/541 ,  A61B6/032

摘要： An X-ray computerized tomography apparatus having an X-ray tube or detector constantly rotated an around an object for acquiring data during specific phase segments of the motion of the object. A period h and a phase are detected from R waves of an electrocardiogram. Searching is then done through a table to provide delay time d, measuring time e, rotating time k (being an integer not a multiple of period h), and counts n corresponding to the period h to the expression below: k=(h-e)/(1-M); wherein M is (0.ltoreq.M

摘要翻译： 一种X射线计算机断层摄影装置，其X射线管或检测器在物体的运动的特定相位段期间不断地旋转在物体周围以获取数据。 从心电图的R波检测周期h和相位。 然后通过表格进行搜索以提供延迟时间d，测量时间e，旋转时间k（不是周期h的倍数的整数），并且对应于下面表达式的周期h的计数n：k =（he） /（1-M）;其中M是（0≤M<1）。 n作为大于k /（h-k）的整数获得。 在操作中，当管或检测器连续地旋转超过k时，在d处发射X射线。 在e期间测量数据，其结束时X射线的发射停止。 经常重复n直到获取图像重建。

公开(公告)号：US5684400A

公开(公告)日：1997-11-04

申请号：US631596

申请日：1996-04-15

申请人： Tetsuji Tsukamoto ,  Eiji Yoshitome

发明人： Tetsuji Tsukamoto ,  Eiji Yoshitome

IPC分类号： G01R33/56 ,  G01R33/563 ,  G01V3/00

CPC分类号： G01R33/561 ,  G01R33/56341 ,  G01R33/5604 ,  G01R33/5611

摘要： An MRI apparatus applies an exciting pulse R1 and a slicing gradient S1 which excites a slice S. Subsequently, it applies a diffusion sensitizing gradient MPG1. Next, it applies a reversing pulse R2 and an FOV limiting gradient RS which limits the data collecting region to have a narrow FOV. Next, it applies a diffusion sensitizing gradient MPG2. Next, it applies a positive and negative reading gradients RA and RB m times alternately and cyclically, and collects MR data from the multiple imaged echoes el.about.em, while applying phase encoding gradients W. The phase encoding gradient W has its amplitude-time product set to be 1/(.gamma..multidot.FOV), where .gamma. is the magnetogyric ratio. The apparatus produces a diffusion sensitized image at a practical spatial resolution, with artifacts attributable to the body movement being alleviated in exchange for a narrow FOV in the phase encoding axis direction.

摘要翻译： MRI装置应用激发脉冲R1和激励切片S的切片梯度S1。随后，它应用扩散增感梯度MPG1。 接下来，它应用限制数据采集区域具有窄FOV的反转脉冲R2和FOV限制梯度RS。 接下来，它应用扩散增感梯度MPG2。 接下来，它交替地循环地施加正负读数梯度RA和RB m次，并且在施加相位编码梯度W的同时从多个成像回波e DIFFERENCE em收集MR数据。相位编码梯度W具有其幅度时间积 设置为1 /（gamma xFOV），其中gamma是磁性比。 该装置以实际的空间分辨率产生扩散敏化图像，由于身体运动造成的伪影在相位编码轴线方向上被减轻以换取较窄的FOV。

公开(公告)号：US4739481A

公开(公告)日：1988-04-19

申请号：US800077

申请日：1985-10-29

申请人： Eiji Yoshitome

发明人： Eiji Yoshitome

IPC分类号： A61B6/03 ,  G01N23/04 ,  G06T11/00 ,  H05G1/60 ,  G01N23/02

CPC分类号： G06T11/008 ,  G01N23/043 ,  H05G1/60

摘要： This invention concerns an X-ray CT image processing apparatus capable correcting the bone-induced beam hardening only based on the reconstructed image data at a high speed and simply, in which the bone region of the reconstructed image is discriminated based on the reconstructed image data, a correcting image data is determined through the masked addition or convolution of a 2-dimensional weight function using thus discriminated bone region as a mask and the correcting image data are added to the reconstructed image data.

摘要翻译： PCT No.PCT / JP85 / 00124 Sec。 371日期1985年10月29日第 102（e）1985年10月29日PCT 1985年3月13日PCT PCT。 第WO85 / 04090号公报 日期：1985年9月26日。本发明涉及一种只能基于重建图像数据高速简单地校正骨诱导束硬化的X射线CT图像处理装置，其中重建图像的骨区域 基于重构的图像数据进行识别，通过使用这样辨别的骨区域作为掩模的二维加权函数的掩蔽加法或卷积来确定校正图像数据，并将校正图像数据添加到重建图像数据。