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    • 2. 发明申请
    • MAGNET ASSEMBLY FOR MRI COMPRISING CYLINDRICAL RINGS OF HALBACH TYPE
    • 包含HALBACH型圆柱环的磁共振成像
    • WO2017072805A1
    • 2017-05-04
    • PCT/IT2016/000252
    • 2016-10-25
    • SOTGIU, Antonello
    • SOTGIU, Antonello
    • G01R33/383G01R33/3873
    • G01R33/383G01R33/3873
    • The present invention identifies the construction methods and the techniques that allow to obtain a magnetic field of the field homogeneity required for the use in magnetic resonance imaging (MRI), in the order of 20 parts per million (ppm) in the area of interest (such techniques in the following will be indicated with the word "shimming"). The peculiarity of the described constructive method is to obtain a homogeneous field region, usable for the MRI analysis, of linear dimensions equal to about 40% of the linear dimensions of the magnet. The shimming technique involves the use of conditioned magnetic material and allows to control accurately the magnetization of the corrective elements while using a material that inherently has a large spread in the magnetization value. The result is a low weight and small magnet suitable for MRI for dedicated clinical applications such as the analysis of the peripheral joint, the analysis of the ocular region, veterinary applications.
    • 本发明确定了允许获得用于磁共振成像(MRI)所需的磁场均匀性的磁场的构造方法和技术,其大约为百万分之20( ppm)在感兴趣的区域中(下文中的这些技术将用词“匀场”来表示)。 所描述的构造方法的特点是获得可用于MRI分析的均匀磁场区域,其线性尺寸等于磁体线性尺寸的约40%。 匀场技术涉及使用经调节的磁性材料,并且允许在使用固有地具有大的磁化值的材料的同时准确地控制校正元件的磁化。 其结果是重量轻,体积小,适用于MRI专用临床应用,如周边关节分析,眼部分析,兽医应用。
    • 5. 发明申请
    • MAGNETIC RESONANCE APPARATUS HAVING REDUCED &quote;DEAD TIME&quote;
    • 具有减少“死亡时间”的磁共振装置
    • WO1998019175A1
    • 1998-05-07
    • PCT/GB1997002936
    • 1997-10-24
    • BRITISH TECHNOLOGY GROUP LIMITEDLURIE, David, JohnALECCI, MarcelloBRIVATI, John, AnthonyTESTA, LucaPLACIDI, GiuseppeSOTGIU, Antonello
    • BRITISH TECHNOLOGY GROUP LIMITED
    • G01R33/32
    • G01R33/3628
    • The invention concerns an improved magnetic resonance apparatus and method for substantially reducing the dead time of the apparatus, in order to recover as much of the submicrosecond FID signals as quickly as possible. A double-channel, out-of-phase signal combination is employed. Two RF receiving coils are arranged with identical ringing characteristics, preferably mutually perpendicular to one another. The RF signal received by one coil is phase shifted by 180 DEG , amplified, and combined with the amplified RF signal received by the other coil. The ringing components cancel, whilst the FID components in phase quadrature do not. The transmitter/receiver apparatus may be of duplex or crossed coil configuration. In the latter case, one of the receiver coils may be oriented parallel to the main field so that it receives no FID signal and operates only to reduce the dead time. The invention is particularly well suited for imagers and spectrometers using pulsed electron paramagnetic resonance (EPR), for the detection of free radicals in biological systems, or for pulsed nuclear magnetic resonance (NMR), where relaxation times are of the order of 100ns to 10 mu s.
    • 本发明涉及一种改进的磁共振装置和方法,用于大大减少装置的死区时间,以尽可能快地恢复尽可能多的亚微米FID信号。 采用双通道异相信号组合。 两个RF接收线圈被布置成具有相同的振铃特性,优选彼此相互垂直。 由一个线圈接收的RF信号相移180°,放大,并与由另一个线圈接收的放大的RF信号组合。 振铃分量取消,而相位正交的FID分量不能。 发射机/接收机设备可以是双工或交叉线圈配置。 在后一种情况下,接收器线圈中的一个可以平行于主场定向,使得其不接收FID信号并且仅操作以减少死区时间。 本发明特别适用于使用脉冲电子顺磁共振(EPR),用于检测生物系统中的自由基或用于脉冲核磁共振(NMR)的成像器和光谱仪,其中弛豫时间为100ns至10 亩。
    • 9. 发明专利
    • ITUB20155325A1
    • 2017-04-28
    • ITUB20155325
    • 2015-10-26
    • SOTGIU ANTONELLO
    • ANTONELLO SOTGIU
    • G01R33/383G01R33/3873
    • Construction methods and techniques allow for a magnetic field of the field homogeneity required for the use in magnetic resonance imaging (MRI), in the order of 20 parts per million (ppm) in the area of interest (such techniques in the following will be indicated with the word “shimming”). The peculiarity of the constructive method is to obtain a homogeneous field region, usable for the MRI analysis, of linear dimensions equal to about 40% of the linear dimensions of the magnet. The shimming technique involves the use of conditioned magnetic material and allows accurate control of the magnetization of the corrective elements while using a material that inherently has a large spread in the magnetization value. The result is a low weight and small magnet suitable for MRI for dedicated clinical applications such as the analysis of the peripheral joint, the analysis of the ocular region, and veterinary applications.