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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。
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2.发明申请公开(公告)号：US20090322330A1
公开(公告)日：2009-12-31
申请号：US12492700
申请日：2009-06-26
申请人： Kohei Adachi , Masatoshi Hanawa , Kazuya Okamoto
发明人： Kohei Adachi , Masatoshi Hanawa , Kazuya Okamoto
IPC分类号： G01R33/48
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 an amplitude and a 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 the one of the amplitude and the 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射信号的幅度和相位中的至少一个，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。 成像单元根据至少包括振幅和相位中的一个的成像条件进行成像来获取图像数据。
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公开(公告)号：US20070170920A1
公开(公告)日：2007-07-26
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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公开(公告)号：US20080164876A1
公开(公告)日：2008-07-10
申请号：US11958925
申请日：2007-12-18
IPC分类号： G01R33/28
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。
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5.发明授权MR imaging using mutual interaction between different kinds of pools of nuclear spins 失效MR成像使用不同种类的核旋转池之间的相互作用
公开(公告)号：US6023634A
公开(公告)日：2000-02-08
申请号：US618859
申请日：1996-03-20
CPC分类号： G01R33/54
摘要： In addition to the known MT (magnetization transfer) effect, an RMT (reverse MT) is newly found, which increases a detected MR signal strength. Both the MT and RMT effects can be explained with mutual interaction, such as phenomena of chemical exchange and/or cross relaxation, acted between a pool of water proton spins and another pool of macromolecule proton spins, for example, within an object. In order to enhance the MT or RMT effect, the frequency bandwidths of RF pulses, such as a 90.degree. RF exciting pulse in a SE or FSE method, an inversion pulse in a FLAIR or fast FLAIR method, and others, are controlled. To enhance the MT effect, the bandwidth is controlled into a wider value (approx. more than 1250 Hz) than the normally (conventionally) used bandwidth, while to obtain the RMT effect, the bandwidth is controlled into a narrower value (approx. less than 1000 Hz) than the normally used bandwidth. Actively controlling the MT or RMT effect permits changed image contrast in MR imaging.
摘要翻译： 除了已知的MT（磁化传递）效应之外，新发现RMT（反向MT），这增加了检测到的MR信号强度。 MT和RMT效应都可以通过相互作用（例如化学交换和/或交叉松弛的现象）来解释，这些现象在水质子旋转池和另一个大分子质子自旋池之间起作用，例如在物体内。 为了提高MT或RMT效应，可以控制RF脉冲的频率带宽，例如SE或FSE方法中的90°RF激励脉冲，FLAIR或快速FLAIR方法中的反转脉冲等。 为了提高MT效应，带宽被控制在比正常（常规）使用的带宽更宽的值（大于1250Hz）的同时，为了获得RMT效应，带宽被控制在较小的值（大约少于 超过1000 Hz）比正常使用的带宽。 积极控制MT或RMT效果可以改善MR成像中的图像对比度。
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公开(公告)号：US5051699A
公开(公告)日：1991-09-24
申请号：US400059
申请日：1989-08-29
IPC分类号： G01R33/485 , G01R33/565
CPC分类号： G01R33/56527 , G01R33/485
摘要： A magnetic resonance imaging system includes a static magnetic field generating section, a gradient magnetic field applying section, an RF pulse applying section, a sequence control section, a receiving section, and an imaging processing section. The sequence control section causes an RF pulse to excite magnetic resonance, causes at least one of the RF pulse and the gradient field to produce an initial magnetic resonance echo, applies a read gradient field to the imaging volume upon reception of the magnetic resonance echo, and inverts the read gradient field at least once to produce at least one magnetic resonance echo in addition to the initial magnetic resonance echo. The receiving section adds and averages data of a plurality of such magnetic resonance echoes or performs an addition or subtraction of the magnetic resonance echoes.
摘要翻译： 磁共振成像系统包括静磁场产生部分，梯度磁场施加部分，RF脉冲施加部分，序列控制部分，接收部分和成像处理部分。 序列控制部分使RF脉冲激发磁共振，使RF脉冲和梯度场中的至少一个产生初始磁共振回波，在接收到磁共振回波时将读取的梯度场应用于成像体积， 并且将读取的梯度场反转至少一次以产生除了初始磁共振回波之外的至少一个磁共振回波。 接收部分添加并平均多个这样的磁共振回波的数据，或执行磁共振回波的加法或减法。
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公开(公告)号：US4476390A
公开(公告)日：1984-10-09
申请号：US363384
申请日：1982-03-29
申请人： Masatoshi Hanawa
发明人： Masatoshi Hanawa
CPC分类号： H01J47/02
摘要： Disclosed is a radiation detector provided at both ends with radiation source position detecting means each including three to five electrode plates in which a bias electrode plate centrally disposed has cover layers on both surfaces, and signal electrode plates disposed on both sides of the bias electrode plate each have a cover layer on only one surface farther from the bias electrode plate. Material of the cover layer has a smaller secondary electron emissive power than that of the material of the electrode plates with respect to incident radiation.
摘要翻译： 公开了一种放射线检测器，其两端设置有辐射源位置检测装置，每个辐射源位置检测装置包括三至五个电极板，其中中心设置的偏置电极板在两个表面上具有覆盖层，并且信号电极板设置在偏置电极板的两侧 每个在仅偏离电极板的一个表面上具有覆盖层。 覆盖层的材料相对于入射辐射具有比电极板的材料更小的二次电子发射功率。
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8.发明授权公开(公告)号：US08111070B2
公开(公告)日：2012-02-07
申请号：US12492700
申请日：2009-06-26
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。
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9.发明授权公开(公告)号：US07741847B2
公开(公告)日：2010-06-22
申请号：US11907198
申请日：2007-10-10
IPC分类号： G01V3/00
CPC分类号： G01R33/3873 , G01R33/3804
摘要： A magnetic resonance apparatus in which magnetic metal pieces are accommodated in an accommodation section so as to correct uniformity in a main magnetic field, includes an acquisition unit which acquires temperature information related to at least one of a temperature of the magnetic metal pieces accommodated in the accommodation section, a temperature of the accommodation section, and a temperature of a position in the vicinity of the accommodation section, and a temperature adjustment unit which adjusts the temperature of the magnetic metal pieces to a target temperature by preheating the magnetic metal pieces on the basis of the temperature information acquired by the acquisition unit.
摘要翻译： 磁性金属片被容纳在收纳部中以校正主磁场的均匀性的磁共振装置包括获取单元，该获取单元获取与容纳在该磁场中的磁性金属片的温度中的至少一个相关的温度信息 收容部的温度，收容部的温度以及收纳部附近的位置的温度，以及温度调节部，其通过将磁性金属片预热到目标温度而将磁性金属片的温度调整为目标温度 由采集单元获取的温度信息的基础。
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公开(公告)号：US07511502B2
公开(公告)日：2009-03-31
申请号：US11958925
申请日：2007-12-18
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。
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