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11. 发明授权

US07511502B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US07511502B2
公开(公告)日：2009-03-31
申请号：US11958925
申请日：2007-12-18
申请人： Yoshitomo Sakakura , Masatoshi Hanawa
发明人： Yoshitomo Sakakura , Masatoshi Hanawa
IPC分类号： G01V3/00
CPC分类号： G01R33/385 , G01R33/3856 , G01R33/3873
摘要： A magnetic resonance imaging apparatus includes a static magnetic field magnet which generates a static magnetic field, a gradient coil unit which generates a gradient magnetic field for overlapping with the static magnetic field, a shim unit which is disposed between the static magnetic field magnet and the gradient coil unit to control the static magnetic field, and a heat shielding member which is disposed between the gradient coil unit and the shim unit to shield a radiant heat of the gradient coil unit.
摘要翻译：磁共振成像装置包括产生静磁场的静磁场磁体，产生用于与静磁场重叠的梯度磁场的梯度线圈单元，设置在静磁场磁体和静磁场之间的垫片单元用于控制静磁场的梯度线圈单元，以及设置在梯度线圈单元和垫片单元之间以屏蔽梯度线圈单元的辐射热的隔热构件。

12. 发明授权

US5343149A Magnetic resonance imaging system 失效
标题翻译：磁共振成像系统
公开(公告)号：US5343149A
公开(公告)日：1994-08-30
申请号：US94916
申请日：1993-07-22
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： A61B5/055 , G01R33/36 , G01R33/46 , G01R33/58 , G01V3/00
CPC分类号： G01R33/583
摘要： In a magnetic resonance imaging system having an automatic power control function for adjusting the transmission power of an RF pulse so as to set a desired flip angle of a spin, in an automatic power control mode, a plane including only a portion of an object to be examined in an imaging region having a uniform field intensity, e.g., a transaxial plane or a plane slightly inclined from the transaxial plane is excited by a gradient magnetic field Gz in the direction of the body axis of the object as a slice gradient magnetic field regardless of a plane to be imaged. The peak values of MR echo signals are detected while the transmission power of the RF pulse is changed. An RF pulse transmission power at which the maximum peak value appears is detected from these detection values. The transmission power of the RF pulse in imaging, i.e., the output of an RF oscillator having a predetermined frequency, is attenuated on the basis of the relationship between the transmission power and the maximum peak value, thereby adjusting the attenuation amount of an attenuator for supplying a current to an RF coil.
摘要翻译：在具有自动功率控制功能的磁共振成像系统中，在自动功率控制模式中，用于调整RF脉冲的发射功率以便设定期望的旋转翻转角度，将仅包括对象的一部分的平面在具有均匀场强的成像区域中进行检查，例如横轴平面或从轴向平面稍微倾斜的平面被作为切片梯度磁场的物体的轴线方向上的梯度磁场Gz激发不管要成像的飞机。当RF脉冲的发送功率改变时，检测MR回波信号的峰值。从这些检测值检测出出最大峰值的RF脉冲发送功率。基于发送功率和最大峰值之间的关系，成像中的RF脉冲的发送功率，即具有预定频率的RF振荡器的输出被衰减，从而调整衰减器的衰减量向RF线圈提供电流。

13. 发明授权

US4767993A Coil system for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的线圈系统
公开(公告)号：US4767993A
公开(公告)日：1988-08-30
申请号：US75758
申请日：1987-07-20
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： A61B5/055 , G01R33/341 , G01R33/36 , G01R33/56 , G01R33/20
CPC分类号： G01R33/3678 , G01R33/56
摘要： A coil system for magnetic resonance imaging in a magnetic resonance imaging system, used to transmit the excitation pulse and to receive the magnetic resonance signals, includes a first coil for transmitting a predetermined high-frequency pulse, second and third coils, arranged on a propagation path of the magnetic resonance signal at a position closer to the object to be examined than the first coil in directions orthogonal to each other, for receiving the magnetic resonance signals, and a pair of tuning elements, respectively provided in association with the second and third coils, for tuning the second and third coils to predetermined magnetic resonance signals. The tuning elements tune the second and third coils slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through the second and third coils coincide with each other.
摘要翻译：用于磁共振成像系统中用于发射激励脉冲并接收磁共振信号的磁共振成像用线圈系统包括用于传输预定的高频脉冲，第二和第三线圈的第一线圈，布置在传播在与第一线圈相对的方向上相对于被检查物体的位置处的磁共振信号的路径相对于彼此正交的方向，用于接收磁共振信号;以及一对调谐元件，分别与第二和第三线圈，用于将第二和第三线圈调谐到预定的磁共振信号。调谐元件调谐第二和第三线圈稍微偏离精确的调谐点，使得通过第二和第三线圈接收的磁共振信号的电压相位彼此一致。

14. 发明授权

US4665364A Magnetic resonance imaging system 失效
标题翻译：磁共振成像系统
公开(公告)号：US4665364A
公开(公告)日：1987-05-12
申请号：US699960
申请日：1985-02-08
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/36 , G01R33/48 , G01R33/58
CPC分类号： G01R33/3621 , G01R33/58
摘要： In a magnetic resonance imaging system, a reference sample made of material including predetermined atomic nuclei to be tomographed is disposed on the side of an object under inspection in a tomographing field (an area to be tomographed) of an MR image. In collecting projection data by detecting the MR signal, the magnitude of the projection data on the reference sample is detected. A substantial gain of an MR signal amplifying section is adjusted according to the detected magnitude.
摘要翻译：在磁共振成像系统中，在MR图像的断层摄影场（要断层的区域）中，在被检查对象的一侧设置由包含预定的待断层原子核的材料构成的参照样品。在通过检测MR信号收集投影数据时，检测参考样本上的投影数据的大小。根据检测到的幅度来调整MR信号放大部分的实质增益。

15. 发明授权

US06567685B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US06567685B2
公开(公告)日：2003-05-20
申请号：US09764215
申请日：2001-01-19
申请人： Hiromitsu Takamori , Ayumi Katsunuma , Hitoshi Kanazawa , Takeshiro Suzuki , Seiji Nozaki , Masatoshi Hanawa , Yoshio Machida , Masaaki Yamanaka , Masao Yui
发明人： Hiromitsu Takamori , Ayumi Katsunuma , Hitoshi Kanazawa , Takeshiro Suzuki , Seiji Nozaki , Masatoshi Hanawa , Yoshio Machida , Masaaki Yamanaka , Masao Yui
IPC分类号： A61B505
CPC分类号： G01R33/3854
摘要： A magnetic resonance imaging apparatus generates an MR signal from an object by applying a gradient field pulse generated by a gradient field coil and a high-frequency magnetic field pulse generated by a high-frequency coil to the object in a static field, and reconstructs an image on the basis of the MR signal. The gradient field coil is housed in a sealed vessel. The internal air in the sealed vessel is exhausted by the pump to prevent noise. By controlling the operation of the pump using a control circuit, noise in imaging operation can be reduced more effectively.
摘要翻译：磁共振成像装置通过将由梯度场线圈产生的梯度场脉冲和由高频线圈产生的高频磁场脉冲施加到静态场中的对象来生成来自对象的MR信号，并且重建基于MR信号的图像。梯度场线圈容纳在密封容器中。密封容器中的内部空气被泵排出，以防止噪音。通过使用控制电路控制泵的操作，可以更有效地降低成像操作中的噪声。

16. 发明授权

US6091242A Magnetic reasonance diagnosis apparatus 有权
标题翻译：磁性推理诊断装置
公开(公告)号：US6091242A
公开(公告)日：2000-07-18
申请号：US149447
申请日：1998-09-09
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： G01R33/48 , A61B5/055 , G01R33/483 , G01R33/54 , G01V3/00
CPC分类号： G01R33/4833 , G01R33/4838
摘要： An inversion pulse is applied to the subject in a static magnetic field. An excitation pulse is applied after a delay time depending on the time constant of the longitudinal relaxation of the spins of proton contained in fat molecule from this inversion pulse. As a result, the spins of proton contained in the fat molecule can be suppressed at high precision. On the basis of the MR signal collected after this suppression, the resonance frequency data of the spins of proton contained in water molecule which is not suppressed or the data corresponding to this resonance frequency, or the magnetic field distribution data of the static magnetic field or the data corresponding to this magnetic field distribution can be determined at high precision.
摘要翻译：在静态磁场中对被摄体施加反转脉冲。在延迟时间之后施加激励脉冲，这取决于从该反转脉冲中包含在脂肪分子中的质子自旋的纵向松弛的时间常数。结果，可以高精度地抑制脂肪分子中包含的质子自旋。基于该抑制后收集的MR信号，水分子中未被抑制的质子自旋的共振频率数据或对应于该共振频率的数据，或静磁场的磁场分布数据，或可以高精度地确定与该磁场分布对应的数据。

17. 发明授权

US4950992A Magnetic resonance imaging system and method 失效
标题翻译：磁共振成像系统及方法
公开(公告)号：US4950992A
公开(公告)日：1990-08-21
申请号：US354762
申请日：1989-05-22
申请人： Kazuto Nakabayashi , Masatoshi Hanawa
发明人： Kazuto Nakabayashi , Masatoshi Hanawa
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/54 , G01R33/56
CPC分类号： G01R33/4828 , G01R33/56
摘要： A magnetic resonance imaging system includes a static field generating section, a gradient field applying section, high-frequency pulse applying section, a sequence control section, a receiving section and an imaging processing section. The sequence control section generates a 180.degree. pulse at a timing at which a center of the 180.degree. pulse appears at time t=TE'/2 when a center of a 90.degree. pulse appears at time t=0 under the condition TE'=TE-N.tau.c (where TE is an echo time with respect to a proton, .tau.c is a period in which phases of spins of the proton and fat match with each other and which is obtained on the basis of a chemical shift of protons of water and the fat, and n is an integer not less than 1), and generates a read gradient field Gr such that its intensity is set to allow an echo peak to appear at time t=TE=TE'+n.tau.c.
摘要翻译：磁共振成像系统包括静电场产生部分，梯度场施加部分，高频脉冲施加部分，序列控制部分，接收部分和成像处理部分。序列控制部分在时间t = TE'/ 2出现180°脉冲的中心的时刻，在时间t = 0出现90度脉冲的中心，在条件TE'= TE-N tau c（其中TE是相对于质子的回波时间，τc是质子和脂肪的自旋相互相互匹配并且基于质子的化学位移获得的时期的水和脂肪，n是不小于1的整数），并且生成读梯度场Gr，使得其强度被设置为允许在时间t = TE = TE'+ n tau c出现回波峰。

18. 发明授权

US4887035A Magnetic resonance spectroscopy system 失效
标题翻译：磁共振光谱系统
公开(公告)号：US4887035A
公开(公告)日：1989-12-12
申请号：US218277
申请日：1988-07-13
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/483 , G01R33/54
CPC分类号： G01R33/4838 , G01R33/482
摘要： A magnetic resonance spectroscopy system repeatedly performs operations of selectively exciting, using a 90.degree. pulse, first two regions which sandwich a local region therebetween in the direction of one of the X axis and y axis for a slice portion, subsequently erasing transverse magnetization components in the first two regions, selectively exciting, using a 90.degree. pulse, second two regions which sandwich the local region therebetween in the direction of the other of the x axis and y axis, subsequently erasing transverse magnetization components in the second two regions, exciting a region having one local region in the z-axis direction to acquire magnetic resonance data therefor, and exciting a region including another local region in the z-axis direction to acquire magnetic resonance data therefor within a repetition time.
摘要翻译：磁共振光谱系统重复地执行使用90°脉冲的切片部分的X轴和y轴之一夹着局部区域的前两个区域的选择性激励的操作，随后擦除横向磁化分量前两个区域选择性激励，使用90度脉冲，在x轴和y轴的另一个方向夹着局部区域的第二两个区域，随后擦除第二两个区域中的横向磁化分量，激发区域，其在z轴方向上具有一个局部区域以获取其磁共振数据，并且激励包括在z轴方向上的另一局部区域的区域以在重复时间内获取其磁共振数据。

19. 发明授权

US08816688B2 Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
标题翻译：磁共振成像装置和磁共振成像方法
公开(公告)号：US08816688B2
公开(公告)日：2014-08-26
申请号：US13214348
申请日：2011-08-22
申请人： Kohei Adachi , Masatoshi Hanawa , Kazuya Okamoto
发明人： Kohei Adachi , Masatoshi Hanawa , Kazuya Okamoto
IPC分类号： G01V3/00
CPC分类号： G01R33/583 , G01R33/5659
摘要： A magnetic resonance imaging apparatus includes an imaging condition acquisition unit and an imaging unit. The imaging condition acquisition unit acquires at least one of optimum amplitude and optimum phase of a radio frequency transmission signal so as to reduce a deviation of data in at least one region of interest set in an object. The imaging unit acquires image data by imaging according to an imaging condition including at least one of optimum amplitude and optimum phase.
摘要翻译：磁共振成像装置包括成像条件获取单元和成像单元。成像条件获取单元获取射频发送信号的最佳幅度和最佳相位中的至少一个，以便减少在对象中设置的至少一个感兴趣区域中的数据的偏差。成像单元根据包括最佳幅度和最佳相位中的至少一个的成像条件进行成像来获取图像数据。

20. 发明授权

US07474096B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US07474096B2
公开(公告)日：2009-01-06
申请号：US11656524
申请日：2007-01-23
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
IPC分类号： G01V3/00
CPC分类号： G01R33/56375 , G01R33/56383
摘要： A magnetic resonance imaging apparatus which applies RF pulses to a subject placed on a top board which is moving in an imaging field in which a static magnetic field and gradient magnetic fields are formed, acquiring magnetic resonance signals emitted from the subject as a result of application of the RF pulses, producing image data based on the acquired magnetic resonance signals, and stopping the generation of a drive signal to move the top board during a magnetic resonance signal acquisition interval.
摘要翻译：将RF脉冲施加到放置在其中形成有静磁场和梯度磁场的成像场中移动的顶板上的被摄体的磁共振成像装置获取作为应用的结果从被检体发射的磁共振信号的RF脉冲，基于获取的磁共振信号产生图像数据，并且在磁共振信号获取间隔期间停止产生驱动信号以移动顶板。

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