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公开(公告)号：US08614574B2
公开(公告)日：2013-12-24
申请号：US12993905
申请日：2009-05-22
CPC分类号： A61B5/055 , A61B5/7285 , A61B5/7289 , A61B5/7292 , G01R33/288 , G01R33/543 , G01R33/5614 , G01R33/56325 , G01R33/5635
摘要： A magnetic resonance imaging apparatus is provided, which is capable of reducing SAR while maintaining S/N ratio and image contrast in a GrE-type pulse sequence, regardless of whether a synchronous imaging is performed or not.The present invention controls a flip angle as to each measurement set 409 that is obtained by division according to the size of phase encoding and a body motion cycle of a subject in the GrE-type pulse sequence. In a set 501 which measures echoes with phase encoding having a minimum absolute value, the flip angle is maximized as to the RF pulse having a minimum phase encoding amount and at least one RF pulse irradiated immediately before. As for the other RF pulses, the flip angle varies within a range less than the maximum, irrespective of the non-imaging mode, the imaging mode, or the size of phase encoding.
摘要翻译： 提供一种磁共振成像装置，其能够在保持GrE型脉冲序列中的S / N比和图像对比度的同时减小SAR，而不管是否执行同步成像。 本发明通过根据GrE型脉冲序列中的对象的相位编码的大小和体动周期进行分割而获得的每个测量组409来控制翻转角。 在测量具有最小绝对值的相位编码回波的组501中，对于具有最小相位编码量的RF脉冲和紧接着照射的至少一个RF脉冲，翻转角度最大化。 对于其他RF脉冲，翻转角度在小于最大值的范围内变化，而与非成像模式，成像模式或相位编码的大小无关。
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公开(公告)号：US20120093385A1
公开(公告)日：2012-04-19
申请号：US13380201
申请日：2010-06-22
申请人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito
发明人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito
IPC分类号： G06K9/62
CPC分类号： A61B5/055 , A61B5/0037 , A61B5/0042 , A61B5/4528 , A61B5/4533 , A61B2576/026 , G01R33/4833 , G01R33/543 , G01R33/546
摘要： There is provided a technique for, in a medical imaging apparatus enabling imaging of an arbitrary plane in a three-dimensional space, enabling automatic calculation of a slice position and automatic calculation of an extracting slice in MPR, without prolonging examination time. Two-dimensional scout scan similar to that used for manual setting of a slice position is performed, and the obtained scout images are processed to calculate a recommended slice position. Algorithms for the processing and various image processing procedures used for the processing are stored beforehand for every type of imaging region and every type of examination.
摘要翻译： 本发明提供一种技术，在能够对三维空间中的任意平面进行成像的医疗成像装置中，能够自动计算切片位置并自动计算MPR中的提取切片，而不延长检查时间。 执行类似于用于手动设置切片位置的二维侦察扫描，并且对所获得的侦察图像进行处理以计算推荐切片位置。 用于处理的算法和用于处理的各种图像处理程序预先存储在每种类型的成像区域和每种类型的检查中。
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公开(公告)号：US10267879B2
公开(公告)日：2019-04-23
申请号：US14240441
申请日：2012-07-27
IPC分类号： G01R33/54 , G01R33/483 , A61B5/055 , A61B5/00
摘要： A technique in a medical imaging apparatus being capable of setting any plane in three-dimensional space as an imaging slice is provided, allowing an automatically-set imaging slice to be configured to suit user's preferences, and determine a position of the imaging slice being configured, with respect to an imaging target subject automatically with a high degree of accuracy. Reference information for specifying the imaging slice, set by the user for each imaging site, is associated with the anatomical feature of the imaging site, so as to generate an imaging slice parameter. Upon actual imaging, the imaging slice parameter and the anatomical feature of the imaging target subject obtained by scout imaging are used to determine the imaging slice position of the imaging target subject.
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公开(公告)号：US20110133735A1
公开(公告)日：2011-06-09
申请号：US12993905
申请日：2009-05-22
IPC分类号： G01R33/44
CPC分类号： A61B5/055 , A61B5/7285 , A61B5/7289 , A61B5/7292 , G01R33/288 , G01R33/543 , G01R33/5614 , G01R33/56325 , G01R33/5635
摘要： A magnetic resonance imaging apparatus is provided, which is capable of reducing SAR while maintaining S/N ratio and image contrast in a GrE-type pulse sequence, regardless of whether a synchronous imaging is performed or not.The present invention controls a flip angle as to each measurement set 409 that is obtained by division according to the size of phase encoding and a body motion cycle of a subject in the GrE-type pulse sequence. In a set 501 which measures echoes with phase encoding having a minimum absolute value, the flip angle is maximized as to the RF pulse having a minimum phase encoding amount and at least one RF pulse irradiated immediately before. As for the other RF pulses, the flip angle varies within a range less than the maximum, irrespective of the non-imaging mode, the imaging mode, or the size of phase encoding.
摘要翻译： 提供一种磁共振成像装置，其能够在保持GrE型脉冲序列中的S / N比和图像对比度的同时减小SAR，而不管是否执行同步成像。 本发明通过根据GrE型脉冲序列中的对象的相位编码的大小和体动周期进行分割而获得的每个测量组409来控制翻转角。 在测量具有最小绝对值的相位编码回波的组501中，对于具有最小相位编码量的RF脉冲和紧接着照射的至少一个RF脉冲，翻转角度最大化。 对于其他RF脉冲，翻转角度在小于最大值的范围内变化，而与非成像模式，成像模式或相位编码的大小无关。
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5.发明授权公开(公告)号：US09194923B2
公开(公告)日：2015-11-24
申请号：US13702652
申请日：2011-06-06
申请人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito , Yukio Kaneko
发明人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito , Yukio Kaneko
IPC分类号： G01V3/00 , G01R33/341 , A61B5/055 , G01R33/565 , G01R33/54 , G01R33/24 , G01R33/561
CPC分类号： G01R33/341 , A61B5/055 , G01R33/246 , G01R33/54 , G01R33/5612 , G01R33/5659
摘要： B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result.
摘要翻译： 在短时间内以高精度计算B1分布，并且获得高质量图像。 在使用具有多个通道的RF线圈照射电磁波的RF匀场中，使用多个重构图像之间的减影图像的绝对值来计算发射灵敏度分布，这是计算RF脉冲之间的信道间相位差和幅度比所必需的 提供给相应的通道。 通过在分别施加不同翻转角的前脉冲之后执行成像序列来获得这些多重重构图像。 假设以最小翻转角获得的图像作为参考图像，例如，在参考图像和其它各个图像之间产生减法图像。 获得的多个减影图像也可以彼此分割，并且基于分割结果创建发送灵敏度分布。
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公开(公告)号：US08587310B2
公开(公告)日：2013-11-19
申请号：US13054155
申请日：2009-07-22
IPC分类号： G01V3/00
CPC分类号： G01R33/56518 , A61B5/055 , A61B5/7257 , G01R33/5616 , G01R33/56341 , G01R33/56563
摘要： In the diffusion-weighted imaging, amounts of distortion and amounts of phase offset of k-space data due to a temporally changing magnetic field error induced by eddy currents and vibrations associated with application of a diffusion-weighted gradient magnetic field pulse are corrected with good precision to improve image quality. Characteristic data for correcting distortion of k-space data are calculated for every position in the slice direction as peak shifts of projections observed between the cases of applying and not applying an MPG pulse. As the characteristic data, amounts of distortion in the read-out direction and the phase encoding direction and phase offset amounts in a slice plane are calculated.
摘要翻译： 在扩散加权成像中，由于由涡流引起的瞬时变化的磁场误差和与施加扩散加权梯度磁场脉冲相关的振动引起的k空间数据的失真量和相位偏移量被校正为良好 精度提高图像质量。 针对切片方向上的每个位置计算用于校正k空间数据的失真的特征数据，作为施加和不施加MPG脉冲的情况之间观察到的投影的峰值偏移。 作为特征数据，计算读取方向上的失真量和切片平面中的相位编码方向和相位偏移量。
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7.发明申请公开(公告)号：US20130082708A1
公开(公告)日：2013-04-04
申请号：US13702652
申请日：2011-06-06
申请人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito , Yukio Kaneko
发明人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito , Yukio Kaneko
IPC分类号： G01R33/341 , G01R33/54
CPC分类号： G01R33/341 , A61B5/055 , G01R33/246 , G01R33/54 , G01R33/5612 , G01R33/5659
摘要： B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result.
摘要翻译： 在短时间内以高精度计算B1分布，并且获得高质量图像。 在使用具有多个通道的RF线圈照射电磁波的RF匀场中，使用多个重构图像之间的减影图像的绝对值来计算发射灵敏度分布，这是计算信道间相位差和RF脉冲幅度比所必需的 提供给相应的通道。 通过在分别施加不同翻转角的前脉冲之后执行成像序列来获得这些多重重构图像。 假设以最小翻转角获得的图像作为参考图像，例如，在参考图像和其它各个图像之间产生减法图像。 获得的多个减影图像也可以彼此分割，并且基于分割结果创建发送灵敏度分布。
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8.发明授权公开(公告)号：US09476956B2
公开(公告)日：2016-10-25
申请号：US13984537
申请日：2012-01-19
申请人： Yo Taniguchi , Suguru Yokosawa , Yoshitaka Bito
发明人： Yo Taniguchi , Suguru Yokosawa , Yoshitaka Bito
IPC分类号： G01R33/56 , A61B5/055 , G01R33/565 , G01R33/561
CPC分类号： G01R33/56 , A61B5/055 , G01R33/5614 , G01R33/5616 , G01R33/56554 , G01R33/56572
摘要： In order to improve image quality, a technique for obtaining information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is provided. A pulse sequence for the main scan is used to repeatedly measure echoes with changing the time integral value of the dephasing pulse for the readout gradient magnetic field. In the above measurement, the phase encoding pulse is not made zero, but two-dimensional data are measured in the same manner as that of the main scan. By using the measured two-dimensional data, correction information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is calculated in each of the readout direction and the phase encoding direction.
摘要翻译： 为了提高图像质量，提供了一种用于获得用于消除由梯度磁场脉冲的波形失真引起的读出方向和相位编码方向上的k空间的失真的信息的技术。 用于主扫描的脉冲序列用于通过改变读出梯度磁场的去相位脉冲的时间积分值来重复测量回波。 在上述测量中，相位编码脉冲不为零，而是以与主扫描相同的方式测量二维数据。 通过使用所测量的二维数据，在每个读出方向和相位上计算用于消除由梯度磁场脉冲的波形失真引起的读出方向上的k空间的失真和相位编码方向的校正信息 编码方向。
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公开(公告)号：US20110112393A1
公开(公告)日：2011-05-12
申请号：US13054155
申请日：2009-07-22
IPC分类号： A61B5/055
CPC分类号： G01R33/56518 , A61B5/055 , A61B5/7257 , G01R33/5616 , G01R33/56341 , G01R33/56563
摘要： In the diffusion-weighted imaging, amounts of distortion and amounts of phase offset of k-space data due to a temporally changing magnetic field error induced by eddy currents and vibrations associated with application of a diffusion-weighted gradient magnetic field pulse are corrected with good precision to improve image quality. Characteristic data for correcting distortion of k-space data are calculated for every position in the slice direction as peak shifts of projections observed between the cases of applying and not applying an MPG pulse. As the characteristic data, amounts of distortion in the read-out direction and the phase encoding direction and phase offset amounts in a slice plane are calculated.
摘要翻译： 在扩散加权成像中，由于由涡流引起的瞬时变化的磁场误差和与施加扩散加权梯度磁场脉冲相关的振动引起的k空间数据的失真量和相位偏移量被校正为良好 精度提高图像质量。 针对切片方向上的每个位置计算用于校正k空间数据的失真的特征数据，作为施加和不施加MPG脉冲的情况之间观察到的投影的峰值偏移。 作为特征数据，计算读取方向上的失真量和切片平面中的相位编码方向和相位偏移量。
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公开(公告)号：US20140191756A1
公开(公告)日：2014-07-10
申请号：US14240441
申请日：2012-07-27
IPC分类号： G01R33/483
CPC分类号： G01R33/483 , A61B5/0037 , A61B5/0042 , A61B5/055 , G01R33/543
摘要： A technique in a medical imaging apparatus being capable of setting any plane in three-dimensional space as an imaging slice is provided, allowing an automatically-set imaging slice to be configured to suit user's preferences, and determine a position of the imaging slice being configured, with respect to an imaging target subject automatically with a high degree of accuracy. Reference information for specifying the imaging slice, set by the user for each imaging site, is associated with the anatomical feature of the imaging site, so as to generate an imaging slice parameter. Upon actual imaging, the imaging slice parameter and the anatomical feature of the imaging target subject obtained by scout imaging are used to determine the imaging slice position of the imaging target subject.
摘要翻译： 提供能够将三维空间中的任何平面设置为成像切片的医疗成像设备中的技术，允许自动设置的成像切片被配置为适合用户的偏好，并且确定被配置的成像切片的位置 ，相对于成像目标物体自动地以高精度。 用于指定用于每个成像部位的用户的成像切片的参考信息与成像部位的解剖特征相关联，以便生成成像切片参数。 在实际成像时，使用通过侦察成像获得的成像目标对象的成像切片参数和解剖特征来确定成像目标对象的成像切片位置。
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