公开(公告)号：US5892359A

公开(公告)日：1999-04-06

申请号：US794590

申请日：1997-02-03

申请人： Masao Yui ,  Kiyomi Mori ,  Arturo Calderon ,  Shigehide Kuhara

发明人： Masao Yui ,  Kiyomi Mori ,  Arturo Calderon ,  Shigehide Kuhara

IPC分类号： A61B5/055 ,  G01R33/385 ,  H01F7/20 ,  G01N3/00

CPC分类号： G01R33/385

摘要： An active shield type gradient coil apparatus comprises main coils for generating a gradient magnetic field and shield coils for generating a magnetic field to reduce the leak magnetic field from the main coils. In the active shield type gradient coil apparatus, a stimulation output section for outputting stimulation to a subject is incorporated. In this incorporation, the main coils are arranged at the outside of an area sandwiched between the stimulation output section and the subject such that the simulation can be transmitted to the subject from the stimulation output section without being blocked by the main coils. By this arrangement, both the use of the active shield type as the gradient coil apparatus and good transmission of stimulation to the subject can be realized.

摘要翻译： 有源屏蔽型梯度线圈装置包括用于产生梯度磁场的主线圈和用于产生磁场的屏蔽线圈，以减少来自主线圈的泄漏磁场。 在有源屏蔽型梯度线圈装置中，包括用于向对象输出刺激的刺激输出部。 在这种结合中，主线圈布置在夹在刺激输出部分和被检体之间的区域的外侧，使得模拟可以从刺激输出部分被传送到被检体而不被主线圈阻挡。 通过这种布置，可以实现使用主动屏蔽型作为梯度线圈装置，并且可以实现对对象的刺激的良好传输。

公开(公告)号：US06002254A

公开(公告)日：1999-12-14

申请号：US16267

申请日：1998-01-30

申请人： Yoshimori Kassai ,  Shoichi Kanayama ,  Shigehide Kuhara ,  Arturo Calderon

发明人： Yoshimori Kassai ,  Shoichi Kanayama ,  Shigehide Kuhara ,  Arturo Calderon

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/56 ,  G01R33/563 ,  G01V3/00

CPC分类号： G01R33/4806 ,  G01R33/5616 ,  G01R33/563

摘要： A nuclear magnetic resonance imaging scheme suitable for an imaging of a physiological function information on a living body. The scheme uses a pulse sequence for realizing a first imaging scheme for obtaining the blood vessel image and a second imaging scheme for obtaining the physiological function image such as a brain function image by a single execution of the pulse sequence, where the first imaging scheme is executed before the second imaging scheme by controlling resolutions and imaging regions for the respective imaging schemes appropriately. The pulse sequence can also realize a third imaging scheme for obtaining the physical shape image, which is to be executed between the first imaging scheme and the second imaging scheme. The physiological function image can be obtained by selecting valid data from the image data acquired with/without stimulation or load by using the t-test, and determining active portions from the selected valid data by using the paired t-test. The physiological function image can then be displayed in superposition with the blood vessel image and/or the physical shape image.

摘要翻译： 一种核磁共振成像方案，适用于对生物体的生理功能信息的成像。 该方案使用脉冲序列来实现用于获得血管图像的第一成像方案和用于通过单次执行脉搏序列来获得诸如脑功能图像的生理功能图像的第二成像方案，其中第一成像方案是 通过适当地控制各个成像方案的分辨率和成像区域，在第二成像方案之前执行。 脉冲序列还可以实现用于获得在第一成像方案和第二成像方案之间执行的物理形状图像的第三成像方案。 可以通过使用t检验从通过或不使用刺激或负载获取的图像数据中选择有效数据，并且通过使用配对t检验从选择的有效数据中确定活动部分来获得生理功能图像。 然后可以与血管图像和/或物理形状图像重叠显示生理功能图像。

公开(公告)号：US5771893A

公开(公告)日：1998-06-30

申请号：US524257

申请日：1995-09-06

申请人： Yoshimori Kassai ,  Shoichi Kanayama ,  Shigehide Kuhara ,  Arturo Calderon

发明人： Yoshimori Kassai ,  Shoichi Kanayama ,  Shigehide Kuhara ,  Arturo Calderon

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/56 ,  G01R33/563

CPC分类号： G01R33/4806 ,  G01R33/5616 ,  G01R33/563

摘要： A nuclear magnetic resonance imaging scheme suitable for an imaging of a physiological function information on a living body. The scheme uses a pulse sequence for realizing a first imaging scheme for obtaining the blood vessel image and a second imaging scheme for obtaining the physiological function image such as a brain function image by a single execution of the pulse sequence, where the first imaging scheme is executed before the second imaging scheme by controlling resolutions and imaging regions for the respective imaging schemes appropriately. The pulse sequence can also realize a third imaging scheme for obtaining the physical shape image, which is to be executed between the first imaging scheme and the second imaging scheme. The physiological function image can be obtained by selecting valid data from the image data acquired with/without stimulation or load by using the t-test, and determining active portions from the selected valid data by using the paired t-test. The physiological function image can then be displayed in superposition with the blood vessel image and/or the physical shape image.

公开(公告)号：US5909120A

公开(公告)日：1999-06-01

申请号：US934620

申请日：1997-09-22

申请人： Kiyomi Mori ,  Shigehide Kuhara

发明人： Kiyomi Mori ,  Shigehide Kuhara

IPC分类号： A61B5/055 ,  G01R33/385 ,  G01V3/00

CPC分类号： G01R33/3852

摘要： A gradient magnetic field power supply includes an amplifier for supplying current to a gradient coil. Between input and output of the amplifier is connected a feedback circuit which feeds a portion of an output current at the output back to the input and has a built-in phase compensating circuit for compensating the phase of the feedback current. The frequency response of the phase compensating circuit is made variable and adjusted to fit variations in the load impedance of the amplifier with time. This ensures optimum phase compensation.

公开(公告)号：US07825660B2

公开(公告)日：2010-11-02

申请号：US12076166

申请日：2008-03-14

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.

摘要翻译： MRI装置包括成像信号获取单元，运动信号获取单元，运动量确定单元，运动校正单元和图像重建单元。 成像信号获取单元获取MR信号作为成像信号。 运动信号获取单元重复获取具有小于成像信号的PE量的MR信号作为运动信号。 运动量确定单元使用运动信号获得运动量。 运动校正单元根据运动量进行摄像信号的校正处理。 图像重建单元使用校正处理之后的成像信号来重建图像。

公开(公告)号：US20080231271A1

公开(公告)日：2008-09-25

申请号：US12076166

申请日：2008-03-14

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01R33/54

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.

公开(公告)号：US07684848B2

公开(公告)日：2010-03-23

申请号：US11231878

申请日：2005-09-22

申请人： Shigehide Kuhara ,  Masao Yui ,  Yoshimori Kassai

发明人： Shigehide Kuhara ,  Masao Yui ,  Yoshimori Kassai

IPC分类号： A61B5/05

CPC分类号： G01R33/5673

摘要： Data acquisition based on the same MRI encoding pattern is repeated at least once for each R wave occurring at time T0 used as a trigger. The necessary number of data for image reconstruction are extracted as subsets of a complete MRI data set from the resulting plural sets of acquired MRI by temporally retrospecting from the next R wave occurrence time (time T1) after the R wave (time T0) used as the trigger. The extracted data subsets are then rearranged to generate a complete composite MRI data set which is then used for image reconstruction of heart movement associated with end-diastole after the occurrence of the triggering R wave.

摘要翻译： 对于在用作触发的时间T0发生的每个R波，基于相同MRI编码模式的数据采集被重复至少一次。 在用作R波（时间T0）之后的下一个R波发生时间（时间T1），从所得到的多组获取的MRI中提取必要数量的用于图像重建的数据作为完整MRI数据集的子集， 触发器。 提取的数据子集然后被重新排列以产生完整的复合MRI数据集，然后将其用于在触发R波发生之后与舒张末期相关的心脏运动的图像重建。

公开(公告)号：US20070205769A1

公开(公告)日：2007-09-06

申请号：US11699325

申请日：2007-01-30

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.

摘要翻译： MRI装置包括成像信号获取单元，运动信号获取单元，运动量确定单元，运动校正单元和图像重建单元。 成像信号获取单元获取MR信号作为成像信号。 运动信号获取单元重复获取具有小于成像信号的PE量的MR信号作为运动信号。 运动量确定单元使用运动信号获得运动量。 运动校正单元根据运动量进行摄像信号的校正处理。 图像重建单元使用校正处理之后的成像信号来重建图像。

公开(公告)号：US07365543B2

公开(公告)日：2008-04-29

申请号：US11699325

申请日：2007-01-30

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.

摘要翻译： MRI装置包括成像信号获取单元，运动信号获取单元，运动量确定单元，运动校正单元和图像重建单元。 成像信号获取单元获取MR信号作为成像信号。 运动信号获取单元重复获取具有小于成像信号的PE量的MR信号作为运动信号。 运动量确定单元使用运动信号获得运动量。 运动校正单元根据运动量进行摄像信号的校正处理。 图像重建单元使用校正处理之后的成像信号来重建图像。

公开(公告)号：US6051975A

公开(公告)日：2000-04-18

申请号：US969709

申请日：1997-11-21

申请人： Kiyomi Mori ,  Shigehide Kuhara

发明人： Kiyomi Mori ,  Shigehide Kuhara

IPC分类号： A61B5/055 ,  G01R33/385 ,  G01V3/00

CPC分类号： G01R33/3852

摘要： A gradient magnetic field power supply includes an amplifier for supplying current to a gradient coil. Between input and output of the amplifier is connected a feedback circuit which feeds a portion of an output current at the output back to the input and has a built-in phase compensating circuit for compensating the phase of the feedback current. The frequency response of the phase compensating circuit is made variable and adjusted to fit variations in the load impedance of the amplifier with time. This ensures optimum phase compensation.

摘要翻译： 梯度磁场电源包括用于向梯度线圈提供电流的放大器。 在放大器的输入和输出之间连接有反馈电路，其馈送输出端的输出电流的一部分返回到输入端，并且具有用于补偿反馈电流的相位的内置相位补偿电路。 相位补偿电路的频率响应是可变的并被调节以适应放大器的负载阻抗随时间的变化。 这样可确保最佳的相位补偿。