Schaltungsanordnung zur Erzeugung von Hochfrequenzsignalen für Kernspinuntersuchungen
    31.
    发明公开
    Schaltungsanordnung zur Erzeugung von Hochfrequenzsignalen für Kernspinuntersuchungen 失效
    用于MR检查生成的高频信号的电路装置。

    公开(公告)号:EP0349078A2

    公开(公告)日:1990-01-03

    申请号:EP89201679.1

    申请日:1989-06-26

    IPC分类号: G01R33/54

    CPC分类号: G01R33/3607

    摘要: Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Erzeugung von Hochfrequenzsignalen für Kernspinunter­suchungen, mit einem Festwertspeicher, in dem ein Signal als Folge von Datenworten gespeichert ist, einem Adressen­generator zum Auslesen von Datenworten aus dem Festwert­speicher mit einer Taktfrequenz und einem dem Festwert­speicher nachgeschalteten Digital-Analog-Wandler. Zur Reduzierung des Speicherbedarfes ist vorgesehen, daß in dem Speicher ein sinusförmiges Signal als Folge von Daten­worten gespeichert ist.

    摘要翻译: 本发明涉及一种电路装置,用于MR检查产生高频率的信号,包括一个只读存储器,在其中信号被存储为数据字的序列,用于以时钟频率从只读存储器中读出的数据字的地址生成器和所述只读存储器的下游数字 - 模拟 转换器。 为了降低存储器要求,规定在存储器制成,正弦信号被存储为数据字的序列。

    MRI METHOD FOR DETERMINING SIGNATURE INDICES OF AN OBSERVED TISSUE FROM SIGNAL PATTERNS OBTAINED BY MOTION-PROBING PULSED GRADIENT MRI
    33.
    发明公开
    MRI METHOD FOR DETERMINING SIGNATURE INDICES OF AN OBSERVED TISSUE FROM SIGNAL PATTERNS OBTAINED BY MOTION-PROBING PULSED GRADIENT MRI 审中-公开
    从运动探测脉冲梯度MRI获取信号模式确定观察组织特征指数的MRI方法

    公开(公告)号:EP3283896A1

    公开(公告)日:2018-02-21

    申请号:EP16715579.5

    申请日:2016-04-12

    发明人: LE BIHAN, Denis

    IPC分类号: G01R33/563 A61B5/055

    摘要: A method for determining a signature index of an observed tissue comprises the step of providing (12) a generic attenuation model of a motion-probing gradient pulse MRI attenuated signal S(b), and providing (14) a reference model parameter vector (p R (i)) corresponding to a reference state of the tissue. On the basis of the evolution of the determined (16) partial differential sensitivities dS ¡ (b) of the model attenuated signal S(b) to each model parameter p(i) at the neutral state attenuated signal S N (b) versus b values, a discrete and narrow size set of key b is built (18) and a series of MRI images of the observed tissue are acquired (20) by using the key b values. Then, for each voxel a signature index (sADC(V), Sdist(V), SCdist(V), Snl(V), SI(V)) of the voxel V is determined (22) as a scalar function depending on a distance between the voxel signal pattern acquired at the key b values and the signal pattern of the reference state of the tissue at the same key b values. An apparatus is configured for implementing such a method.

    VERFAHREN ZUM BETREIBEN EINER LOKALSPULE UND LOKALSPULE SOWIE MAGNETRESONANZTOMOGRAPH
    34.
    发明公开
    VERFAHREN ZUM BETREIBEN EINER LOKALSPULE UND LOKALSPULE SOWIE MAGNETRESONANZTOMOGRAPH 审中-公开
    用于操作本地线轴和本地线轴以及磁共振成像的方法

    公开(公告)号:EP3270177A1

    公开(公告)日:2018-01-17

    申请号:EP17174212.5

    申请日:2017-06-02

    IPC分类号: G01R33/36 G01R19/252

    摘要: Die Erfindung betrifft Verfahren zum Betreiben einer Lokalspule (6) für einen Magnetresonanztomographen (2) mit , welche eine Empfangsantenne (16) und einen Signalumsetzer (18) aufweist und signaltechnisch mittels einer Signalleitung (8) mit einer Patientenliege (4) gekoppelt ist, wobei die Empfangsantenne (16) ein analoges Magnetresonanzsignal (22) in einem ersten Signalfrequenzbereich (24) empfängt, wobei das analoge Magnetresonanzsignal (22) mittels des Signalumsetzers (18) in ein digitales Magnetresonanzsignal (34) gewandelt und derart frequenzverschoben wird, dass das digitale Magnetresonanzsignal (34) in einen mit dem ersten Signalfrequenzbereich (24) nicht überlappenden, vorzugsweise gegenüber diesem höherfrequenten, zweiten Signalfrequenzbereich (38) versetzt wird.

    摘要翻译: 本发明涉及一种方法,用于对磁共振成像扫描仪(2),其具有接收天线(16)和一个信号转换器(18),并通过信号线(8)与患者支撑件(4)的装置信令目的接到工作局部线圈(6),其特征在于 在第一信号的频率范围(24),其中所述模拟的磁共振信号(22)由所述信号转换器的装置被转换(18)转换成数字的磁共振信号(34)和在频移的接收的接收天线(16)的模拟的磁共振信号(22),使得所述数字磁共振信号 (34)不重叠的频率范围内与第一信号(24),优选相对这个较高的频率,第二信号的频率范围(38)被移位。

    MAGNETIC RESONANCE IMAGING APPARATUS
    35.
    发明公开
    MAGNETIC RESONANCE IMAGING APPARATUS 审中-公开
    磁共振成像设备

    公开(公告)号:EP3223700A1

    公开(公告)日:2017-10-04

    申请号:EP15862964.2

    申请日:2015-09-16

    IPC分类号: A61B5/055 G01R33/34

    摘要: There are provided a magnetic resonance imaging device and a method of controlling a MRI device. The MRI device includes an RF transmitting coil configured to transmit an RF to an object on a table; an object scanning unit including a position detecting unit configured to detect a position of the object and a thickness detecting unit configured to detect a thickness of the object, and configured to recognize a body shape of the object; and a control unit configured to regulate the RF to be transmitted, thereby compensating an RF field based on the recognized body shape of the object.

    摘要翻译: 提供了一种磁共振成像设备和一种控制MRI设备的方法。 MRI设备包括:RF发射线圈,被配置为将RF发射到桌上的物体; 物体扫描单元,包括位置检测单元和厚度检测单元,所述位置检测单元被构造为检测所述对象的位置,所述厚度检测单元被构造为检测所述对象的厚度,并且被配置为识别所述对象的体形; 以及控制单元,被配置为调节要发射的RF,从而基于识别出的物体的身体形状来补偿RF场。

    MAGNETIC RESONANCE IMAGING WITH RF NOISE DETECTION COILS
    36.
    发明公开
    MAGNETIC RESONANCE IMAGING WITH RF NOISE DETECTION COILS 审中-公开
    MAGNETRESONANZBILDGEBUNG MIT SPULEN ZUR DETEKTION VON HF-RAUSCHEN

    公开(公告)号:EP3126861A1

    公开(公告)日:2017-02-08

    申请号:EP15712158.3

    申请日:2015-03-26

    摘要: The invention provides for a magnetic resonance imaging system (100) for acquiring magnetic resonance data (142, 144) from an imaging zone (108). Execution of the instructions causes a processor (133) controlling the MRI system to: acquire (200) imaging magnetic resonance data (142) with radio frequency excitation of the radio frequency system enabled; acquire (202) noise radio frequency data (148) using at least one RF noise detection coil, wherein the noise radio frequency data is acquired simultaneously with the imaging magnetic resonance data; acquire (204) calibration magnetic resonance data (144) with radio frequency excitation of the radio frequency system disabled; acquire (206) reference radio frequency data (146) using the at least one RF noise detection coil, wherein the reference radio frequency data is acquired simultaneously with the calibration magnetic resonance data; and calculate (208) a noise calibration (150) using the reference radio frequency data and the calibration magnetic resonance data.

    摘要翻译: 本发明提供一种用于从成像区域(108)获取磁共振数据(142,144)的磁共振成像系统(100)。 所述指令的执行使得控制所述MRI系统的处理器(133)利用所述无线电频率系统的射频激励获取(200)成像磁共振数据(200); 使用至少一个RF噪声检测线圈获取(202)噪声射频数据(148),其中与成像磁共振数据同时获取噪声射频数据; 利用无线电频率系统的射频激励来取得(204)校准磁共振数据(144); 使用所述至少一个RF噪声检测线圈获取(206)参考射频数据(146),其中所述参考射频数据与所述校准磁共振数据同时获取; 并使用参考射频数据和校准磁共振数据计算(208)噪声校准(150)。

    SYSTEM AND METHOD FOR DIRECT RADIO FREQUENCY PHASE CONTROL IN MAGNETIC RESONANCE IMAGING
    38.
    发明公开
    SYSTEM AND METHOD FOR DIRECT RADIO FREQUENCY PHASE CONTROL IN MAGNETIC RESONANCE IMAGING 审中-公开
    系统和方法的直接无线电频率相位控制在磁成像

    公开(公告)号:EP2839305A1

    公开(公告)日:2015-02-25

    申请号:EP13719205.0

    申请日:2013-04-16

    IPC分类号: G01R33/36

    摘要: Described here are systems and methods for improved magnetic resonance imaging ("MRI"} using a radio frequency ("RF"} system that establishes a Larmor frequency using a clock signal generated by the RF system to provide phase coherency and improved spectral quality among the RF pulses generated by the RF system. With this system, the conventionally relied-upon reference signal is no longer needed to maintain phase coherency. Instead, the system clock of the RF system is used to create the Larmor frequency used for pulse formation in the RF transmitter and for signal demodulation in the RF receiver.

    Magnetic resonance imaging system with a fixed output amplitude transmitter
    39.
    发明公开
    Magnetic resonance imaging system with a fixed output amplitude transmitter 审中-公开
    Magnetresonanzbildgebungssystem mit einem Sender mit fester Ausgangsamplitude

    公开(公告)号:EP2544017A1

    公开(公告)日:2013-01-09

    申请号:EP11172486.0

    申请日:2011-07-04

    IPC分类号: G01R33/36

    摘要: The invention relates to a magnetic resonance imaging system for acquiring magnetic resonance data from a subject within an imaging volume. The magnetic resonance imaging system comprises a transmitter for generating radio-frequency pulses (708) for exciting atomic nuclei within the imaging volume using a radio-frequency antenna. The transmitter has a fixed output amplitude and a modulated output. The transmitter is configured to generate the radio-frequency pulses by switching radio-frequency emissions at the fixed output amplitude on and off. The transmitter is further configured to generate the radio-frequency pulses by controlling the modulated output. The magnetic resonance imaging system further comprises a receiver for receiving radio-frequency emissions from the excited atomic nuclei using the radio-frequency antenna.

    摘要翻译: 本发明涉及一种用于从成像体内的对象获取磁共振数据的磁共振成像系统。 磁共振成像系统包括用于使用射频天线产生用于激发成像体内的原子核的射频脉冲(708)的发射器。 发射机具有固定的输出幅度和调制输出。 发射机被配置为通过以固定的输出幅度开启和关闭来切换射频发射来产生射频脉冲。 发射机还被配置为通过控制调制输出来产生射频脉冲。 磁共振成像系统还包括用于使用射频天线从激发的原子核接收射频发射的接收器。

    RF BASED SPATIALLY SELECTIVE EXCITATION IN MRI
    40.
    发明公开
    RF BASED SPATIALLY SELECTIVE EXCITATION IN MRI 审中-公开
    AUF HF BASIERENDERÄUMLICHSELEKTIVE ERREGUNG BEI MRI

    公开(公告)号:EP2147329A4

    公开(公告)日:2012-03-21

    申请号:EP08757081

    申请日:2008-05-02

    摘要: Herein a method for slice selection is provided in an MRI process, the method involves controlling a transmit array by adding low flip angle RF pulses interspersed between refocusing pulses that are used to move a k-space weighting function with respect to one or more B 1 fields used to deposit energy according to a desired k-space weighting function. The low flip angle pulses deposit energy so that an envelope traced by the low flip angle pulses in the k-space weighting function is related to a desired spatially excited region of the sample volume, for example by a Fourier transform, if the phase encoding directions are linear axes that coordinatize the sample volume, and the B 1 fields have linear phase gradients.

    摘要翻译: 这里,在MRI处理中提供了切片选择的方法,该方法包括通过将用于相对于一个或多个B 1移动k空间加权函数的重聚焦脉冲之间的散布的低翻转角RF脉冲相加来控制发射阵列 用于根据期望的k空间加权函数来存储能量的场。 低翻转角脉冲沉积能量,使得通过k空间加权函数中的低翻转角脉冲跟踪的包络与样本体积的期望的空间激发区域有关,例如通过傅立叶变换,如果相位编码方向 是使样本体积协调的线性轴,B 1场具有线性相位梯度。