-
公开(公告)号：US5277182A
公开(公告)日：1994-01-11
申请号：US723692
申请日：1991-06-24
申请人： Hideaki Koizumi , Ryuzaburo Takeda , Hideki Kohno , Tetsuo Yokoyama , Yoshiyuki Miyamoto , Koichi Sano
发明人： Hideaki Koizumi , Ryuzaburo Takeda , Hideki Kohno , Tetsuo Yokoyama , Yoshiyuki Miyamoto , Koichi Sano
IPC分类号： A61B5/055 , G01R33/563
CPC分类号： A61B5/055 , G01R33/563
摘要： A method for imaging the coronary artery of a living body using nuclear magnetic resonance, wherein a patient is located in a static magneic field and the heart cycle of the patient is detected with the heart dilation period of the patient being determined in accordance with the detected heart cycle. Then, the coronary artery of the patient is portrayed on the nuclear magnetic resonance signal generated by applying high-frequency energy to the patient during the determined heart dilation period.
摘要翻译： 一种使用核磁共振对活体的冠状动脉成像的方法，其中患者位于静态磁场中，并且根据检测到的患者的心脏扩张周期被确定，患者的心脏周期被检测到 心脏周期。 然后，在确定的心脏扩张期间，将患者的冠状动脉描绘在通过对患者施加高频能量而产生的核磁共振信号上。
-
公开(公告)号：US4942359A
公开(公告)日：1990-07-17
申请号：US301901
申请日：1989-01-25
申请人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
CPC分类号： G01R33/563
摘要： An MR imaging method comprising detecting resonant signals from a portion including blood vessels by the three-dimensional imaging incorporating depthwise information, and performing subtraction, with respect to the signal data in each voxel in the complex number representation, between the image data obtained by adding the complex numbers in the projection direction and the image data obtained by adding the absolute values of the complex numbers in the projection direction, to extract the image of only the blood vessel.
摘要翻译： 一种MR成像方法，包括通过包含深度信息的三维成像从包括血管的部分检测谐振信号，并且对于复数表示中的每个体素中的信号数据，通过添加获得的图像数据执行减法 投影方向上的复数和通过将投影方向上的复数的绝对值相加而获得的图像数据，以提取仅血管的图像。
-
公开(公告)号：US5023553A
公开(公告)日：1991-06-11
申请号：US330835
申请日：1989-03-30
申请人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
CPC分类号： G01R33/5676
摘要： In order to eliminate the degradation of NMR image caused by a body motion due to breathing or the like, one of measured image signals is selected as a reference, correlation is calculated between each measured image signal and the reference, and the image signal is modified on the basis of the value of correlation.
摘要翻译： 为了消除由于呼吸等引起的身体运动引起的NMR图像的劣化，选择测量图像信号之一作为参考，在每个测量的图像信号和参考之间计算相关性，并且图像信号被修改 在相关性的基础上。
-
公开(公告)号：US4724388A
公开(公告)日：1988-02-09
申请号：US869976
申请日：1986-06-02
申请人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
IPC分类号： G01R33/565 , G01R33/20
CPC分类号： G01R33/56518 , G01R33/56563
摘要： In order to measure a static field distribution with one scanning operation and to make image distortion corrections with the static field distribution and a gradient field distribution simultaneously considered, an image is reconstructed using a spin echo signal produced under the condition that a time interval between a 90.degree. pulse and a 180.degree. pulse differs from an interval between the 180.degree. pulse and the time origin of the spin echo signal, the static field distribution is evaluated from the relation of distortions to phase errors free from a phase distortion attributed to the characteristic of a detecting part and a phase distortion attributed to the dynamic characteristic of the gradient field, a relations existing between the spatial distortion and phase distortion of the reconstructed image and a magnetic field distribution including the gradient field is obtained, and the distortion magnitude of the reconstructed image is evaluated from the measured magnetic field distribution.
摘要翻译： 为了通过一次扫描操作测量静态场分布，并且同时考虑静态场分布和梯度场分布进行图像失真校正，使用自旋回波信号来重构图像，该自旋回波信号是在 90°脉冲和180°脉冲与180°脉冲与自旋回波信号的时间原点之间的间隔不同，静态场分布从失真和相位误差的关系来评估，该相位误差不包括归因于特性的相位失真 得到归因于梯度场的动态特性的检测部分和相位失真，获得重建图像的空间失真和相位失真之间存在的关系以及包括梯度场的磁场分布，并且， 从测量的磁场分布评估重建图像 。
-
公开(公告)号：US5207222A
公开(公告)日：1993-05-04
申请号：US713316
申请日：1991-06-11
CPC分类号： G01R33/4804
摘要： Based on the relation that the higher the temperature of a portion to be measured, the lower becomes coherence of a nuclear spin at that portion, the present invention measures indirectly the temperature state of the portion to be measured from the change of intensity of NMR signals by utilizing this relationship. A transverse relaxation time is contained as one of the parameters in the relation between the signal intensity and the temperature; hence this transverse relaxation time is determined in advance for the portion to be measured and utilized in for the equation representing their relationship. This application discloses also an invention for determining a blood perfusion rate of the portion to be measured from the temperature data obtained in the manner described above.
摘要翻译： 基于测量部分的温度越高，该部分的核自旋的相关性越低，本发明根据NMR信号的强度的变化间接地测量待测部分的温度状态 通过利用这种关系。 横向弛豫时间作为信号强度与温度之间关系的参数之一; 因此该横向弛豫时间预先被测量的部分用于表示它们的关系的方程式。 本申请还公开了根据以上述方式获得的温度数据来确定待测量部分的血液灌注速率的发明。
-
公开(公告)号：US5254948A
公开(公告)日：1993-10-19
申请号：US660084
申请日：1991-02-25
申请人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
IPC分类号： G01R33/567 , G01V3/00
CPC分类号： G01R33/5676
摘要： In order to eliminate the degradation of NMR image caused by a body motion due to breathing or the like, one of measured image signals is selected as a reference, correlation is calculated between each measured image signal and the reference, and the image signal is modified on the basis of the value of correlation.
摘要翻译： 为了消除由于呼吸等引起的身体运动引起的NMR图像的劣化，选择测量图像信号之一作为参考，在每个测量的图像信号和参考之间计算相关性，并且图像信号被修改 在相关性的基础上。
-
公开(公告)号：US5113137A
公开(公告)日：1992-05-12
申请号：US579581
申请日：1990-09-10
申请人： Hideaki Koizumi , Koichi Sano , Tetsuo Yokoyama , Kazuya Sukegawa
发明人： Hideaki Koizumi , Koichi Sano , Tetsuo Yokoyama , Kazuya Sukegawa
摘要： There is provided an image noise reduction method for improving the signal-to-noise ratio of an image when observed. The image signal of an identical region is measured twice at different times. Images obtained by respective measurements and seen from an identical visual point are so juxtaposed on an identical plane as to form two sheets. By seeing the two sheets of images with parallax changed directly or through stereo glass, the effective signal components of the images are focused on the same plane whereas only noise components are dispersed in a direction perpendicular to the plane.
摘要翻译： 提供了一种用于在观察时改善图像的信噪比的图像噪声降低方法。 相同区域的图像信号在不同时间测量两次。 通过各自的测量得到的图像和从相同的视点观察到的图像被并置在相同的平面上以形成两张纸。 通过直视或立体玻璃观看视差的两张图像，图像的有效信号分量聚焦在同一平面上，而只有噪声分量在垂直于平面的方向上分散。
-
公开(公告)号：US5016637A
公开(公告)日：1991-05-21
申请号：US356418
申请日：1989-05-25
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/563 , G01R33/567
CPC分类号： G01R33/5673 , G01R33/563
摘要： An MRI method is disclosed, by which, when liquid moving in a body to be examined stays in a predetermined region, this region is excited by using the nuclear magnetic resonance phenomenon and when the liquid thus excited moves from that excited region, a nuclear magnetic resonance signal produced by the excited spin and emitted during the relaxation time thereof is detected.
摘要翻译： 公开了一种MRI方法，通过该方法，当待检查的体内移动的液体停留在预定区域时，通过使用核磁共振现象来激发该区域，并且当该激发的液体从该激发区域移动时， 检测在其弛豫时间期间由激发的自旋产生并发射的共振信号。
-
公开(公告)号：US5014007A
公开(公告)日：1991-05-07
申请号：US412219
申请日：1989-09-25
申请人： Koichi Sano , Shimbu Yamagata , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Shimbu Yamagata , Tetsuo Yokoyama , Hideaki Koizumi
IPC分类号： G01R33/563 , G01R33/565 , G01R33/567
CPC分类号： G01R33/56308 , G01R33/56316 , G01R33/565 , G01R33/56563
摘要： To display the information, as an image, regarding the moving portion of the object without the aid of the doctor, the image is reconstructed on the basis of the observed NMR signal and the image phase information is calculated from the image intensity information derived from the reconstructed image, and the phase information calculated is displayed as the image.
摘要翻译： 为了在没有医生帮助的情况下作为图像显示关于物体的移动部分的信息，基于观察到的NMR信号重建图像，并且根据从图像强度信息导出的图像强度信息来计算图像相位信息 重建图像，并且计算的相位信息被显示为图像。
-
公开(公告)号：US4947837A
公开(公告)日：1990-08-14
申请号：US379674
申请日：1989-07-13
申请人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
发明人： Koichi Sano , Tetsuo Yokoyama , Hideaki Koizumi
CPC分类号： A61B5/0263
摘要： The blood flow imaging method excites selectively a partial region of the body to be tested including blood vessels inside or outside of the view field of image, measures resonance signals by utilizing spins flowing out of the excited region, and images a blood vessel system based on the blood flow information included in the measured resonance signals. The method images only blood vessels through a single shot of scanning, thereby reducing the time for scanning and enabling the observation of finer vessels.
摘要翻译： 血流成像方法选择性地激发被检体的部分区域，包括图像视野内部或外部的血管，通过利用从兴奋区域流出的旋转来测量共振信号，并且基于 包括在所测量的共振信号中的血流信息。 该方法通过单次扫描仅对血管进行成像，从而减少扫描时间并使观察更细小的血管。
-
-
-
-
-
-
-
-
-
搜索结果
96 条记录 (耗时 0.023 秒)
