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1. 发明授权

US4793356A Surface coil system for magnetic resonance imaging 失效
公开(公告)号：US4793356A
公开(公告)日：1988-12-27
申请号：US765708
申请日：1985-08-14
申请人： George J. Misic , Gregory C. Hurst , G. Neil Holland , John L. Patrick, III , Paul T. Orlando
发明人： George J. Misic , Gregory C. Hurst , G. Neil Holland , John L. Patrick, III , Paul T. Orlando
IPC分类号： A61B5/055 , A61B10/00 , G01R33/341 , G01R33/36 , G01R33/44 , G01R33/48 , H01F6/06 , A61B5/05
CPC分类号： G01R33/3628 , G01R33/341
摘要： A resonance exciting coil (C) excites magnetic resonance in nuclei disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil. The received signals are amplified by an amplifier (82) and processed by an image processor (30) to form man-readable images of the examined region of the patient for display on a video display (32) or the like.

2. 发明授权

US4752738A Three dimensional localized coil for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的三维局部线圈
公开(公告)号：US4752738A
公开(公告)日：1988-06-21
申请号：US931726
申请日：1986-11-17
申请人： John L. Patrick , Mehrdad Mehdizadeh , Gregory C. Hurst
发明人： John L. Patrick , Mehrdad Mehdizadeh , Gregory C. Hurst
IPC分类号： G01N33/00 , G01R33/34 , G01R33/341 , G01R33/36 , G01R33/20
CPC分类号： G01R33/3628 , G01R33/34046 , G01R33/341
摘要： The magnetic resonance signals in a magnetic resonance imaging apparatus are detected by a surface or localized coil assembly (D). To improve the field homogeneity and increase the signal-to-noise ratio when examining a region of interest deep within a subject, the surface coil assembly is configured with a first coil portion (22) and a second coil portion (24). The first coil portion is disposed along an exterior surface of the subject. The second coil portion is disposed parallel to the first coil portion and displaced outward a distance (44) from the first coil portion and the subject exterior surface. The first and second coil portions are electrically interconnected with an opposite current phase in a dipole pair such that the second current portion reduces the sensitivity of the first coil portion to magnetic resonance signals originating close to the surface of the subject.
摘要翻译：磁共振成像装置中的磁共振信号由表面或局部线圈组件（D）检测。为了在检查受试者深处感兴趣的区域时改善场均匀性并增加信噪比，表面线圈组件配置有第一线圈部分（22）和第二线圈部分（24）。第一线圈部分沿被检体的外表面设置。第二线圈部分平行于第一线圈部分设置并向外移动与第一线圈部分和被摄体外表面的距离（44）。第一和第二线圈部分与偶极对中的相反电流相电互连，使得第二电流部分将第一线圈部分的灵敏度降低到靠近被摄体表面的磁共振信号。

3. 发明授权

US5063560A Spread-spectrum multiplexed transmission system 失效
标题翻译：扩频复用传输系统
公开(公告)号：US5063560A
公开(公告)日：1991-11-05
申请号：US265858
申请日：1988-08-04
申请人： Michael J. Yerbury , Gregory C. Hurst
发明人： Michael J. Yerbury , Gregory C. Hurst
IPC分类号： G01S5/06 , H04B1/707 , H04J1/02 , H04J13/00
CPC分类号： H04J13/00 , G01S5/06 , H04B1/707
摘要： A spread-spectrum transmission system wherein a plurality of spread-spectrum signals are frequency division multiplexed by offsetting the center or carrier frequencies of the spread-spectrum signals by a fraction of the spectral-line spacing of the signals. The signals are generated by modulating a carrier with a pseudo-noise (PN) code signal. At a receiver, demultiplexing is carried out by mixing (42) the received multiplexed signal with a plurality of local oscillator frequencies (43) which are offset from each other in the same manner as the centre or carrier frequencies of the multiplexed spread-spectrum signals. The mixed signals are then further mixed (45) with generated PN code signals (47) corresponding to those used to generate the multiplexed spread-spectrum signals. The epoch of each generated PN code signal is then advanced or retarded in response to a respective epoch control signal (48) generated by a respective controller (46). After mixing (45) the signals are passed through respective narrowband filters (49) to select the baseband signals which are then fed to the respective controllers (46) to enable the generation of the epoch control signals (48 ). When applied to a vehicle tracking system a number of spaced receivers are utilized.
摘要翻译： PCT No.PCT / AU87 / 00020 Sec。 371日期1988年8月4日 102（e）日期1988年8月4日PCT PCT 1987年1月27日PCT公布。公开号WO87 / 04883 日期1987年8月13日。一种扩频传输系统，其中多个扩频信号通过将扩展频谱信号的中心或载波频率偏移信号的谱线间隔的一部分进行频分复用。通过用伪噪声（PN）码信号调制载波来产生信号。在接收机中，通过将接收到的多路复用信号与多个本地振荡器频率（43）混合（42）来进行解复用，该多个本地振荡器频率以与多路复用扩展频谱信号的中心或载波频率相同的方式彼此偏移。混合信号随后与生成多路复用扩频信号的PN码信号（47）进一步混合（45）。响应于由相应控制器（46）产生的相应历元控制信号（48），每个产生的PN码信号的时期随后被提前或延迟。在混合（45）之后，信号通过相应的窄带滤波器（49）以选择基带信号，然后馈送给相应的控制器（46），以便能够产生时代控制信号（48）。当应用于车辆跟踪系统时，使用多个间隔的接收器。

4. 发明授权

US4920318A Surface coil system for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的表面线圈系统
公开(公告)号：US4920318A
公开(公告)日：1990-04-24
申请号：US252819
申请日：1988-10-03
申请人： George J. Misic , Gregory C. Hurst , G. Neil Holland , John L. Patrick, III , Paul T. Orlando
发明人： George J. Misic , Gregory C. Hurst , G. Neil Holland , John L. Patrick, III , Paul T. Orlando
IPC分类号： G01R33/34 , G01R33/341 , G01R33/36
CPC分类号： G01R33/3628 , G01R33/34046 , G01R33/341 , G01R33/34007 , G01R33/34084 , G01R33/3657
摘要： A resonance exciting coil (C) excites magnetic resonance in nuclei disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil. The received signals are amplified by an amplifier (82) and processed by an image processor (30) to form man-readable images of the examined region of the patient for display on a video display (32) or the like.
摘要翻译：共振励磁线圈（C）在设置在已经产生主磁场和横向梯度的图像区域中的核中激发磁共振。柔性接收线圈（D）包括柔性塑料片（40），一个或多个环（20）粘附在柔性塑料片上以接收来自谐振核的信号。魔术贴带（46）将柔性片材和附接的线圈绑定成与待成像的患者部分的表面紧密一致。阻抗匹配或线圈共振频率调整网络（50）安装在柔性片上，用于选择性地调节接收线圈的阻抗匹配和峰值灵敏度谐振频率中的至少一个。前置放大器（52）在电缆（24）上传输之前放大所接收的信号。选择性可变电压源（70）向电缆施加选择性可调节的直流偏置电压，用于选择性地调节接收线圈的阻抗匹配和LC谐振频率中的至少一个。所接收的信号由放大器（82）放大并由图像处理器（30）处理，以形成用于在视频显示器（32）等上显示的被检查区域的人可读图像。

5. 发明授权

US4771242A In-vivo spatially encoded magnetic resonance spectroscopy with solvent suppression 失效
标题翻译：具有溶剂抑制的体内空间编码磁共振光谱
公开(公告)号：US4771242A
公开(公告)日：1988-09-13
申请号：US834318
申请日：1986-02-27
申请人： David A. Lampman , Gregory C. Hurst , James M. McNally
发明人： David A. Lampman , Gregory C. Hurst , James M. McNally
IPC分类号： G01R33/483 , G01R33/20
CPC分类号： G01R33/4838
摘要： A binomial pulse generator (32) selectively generates binomial radio frequency excitation pulses (60) which induce magnetic resonance only in selected hydrogen dipoles and suppresses resonance in others. An inversion pulse generator (34) generates a first inversion pulse (70) in the presence of a first magnetic field gradient (72) generated by a gradient control (22). The inversion pulse only inverts the magnetization of resonating nuclei in a first plane defined by the first magnetic field gradient. A second inversion pulse (74) applied in the presence of a second magnetic field gradient (76) inverts the magnetization of resonating nuclei in a second planar region defined by the second magnetic field gradient. A third inversion pulse (78) applied concurrently with a third magnetic field gradient (80) inverts the magnetization of resonating nuclei in a third planar region defined by the third magnetic field gradient. Only resonating nuclei in a volumetric element defined at the intersection of the first, second, and third planes are inverted all three times. The magnetization of other dipoles will have dephased differently from the dipoles in the volumetric element. In this manner, only the dipoles in the volumetric element contribute to a spin echo (82) which follows the third inversion pulse. Data acquired during the third spin echo may be spectrographically analyzed to determine the chemical composition within the volumetric element. Alternately, a phase encoding gradient (90) and a read gradient (92) may be applied as part of the sequence to provide the appropriate phase encoding to the acquired data such that the acquired data can be reconstructed into an image representation.
摘要翻译：二项式脉冲发生器（32）选择性地产生二项式射频激励脉冲（60），其仅在选定的氢偶极子中诱发磁共振，并抑制其它谐振。反转脉冲发生器（34）在由梯度控制（22）产生的第一磁场梯度（72）的存在下产生第一反转脉冲（70）。反转脉冲仅在由第一磁场梯度限定的第一平面中反转谐振核的磁化。在第二磁场梯度（76）的存在下施加的第二反转脉冲（74）使由第二磁场梯度限定的第二平面区域中的谐振核的磁化反转。与第三磁场梯度（80）同时施加的第三反转脉冲（78）使由第三磁场梯度限定的第三平面区域中的谐振核的磁化反转。只有在第一，第二和第三平面相交处限定的体积元素中的共振核都被三次倒置。其他偶极子的磁化将与体积元素中的偶极子不同。以这种方式，仅体积元素中的偶极子有助于遵循第三反转脉冲的自旋回波（82）。在第三自旋回波期间获得的数据可以被光谱分析以确定体积元素内的化学成分。或者，可以将相位编码梯度（90）和读取梯度（92）应用作为序列的一部分，以向所获取的数据提供适当的相位编码，使得所获取的数据可被重构为图像表示。

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