公开(公告)号：US5757187A

公开(公告)日：1998-05-26

申请号：US916423

申请日：1997-08-22

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: G01F1/716 ,  G01R33/563 ,  G01V3/00

CPC classification number: G01F1/716 ,  G01R33/563

Abstract: Weak oscillating gradients are used to modulate the angular momentum of the spins in a magnetic resonance imaging apparatus producing output signals in the receiver coil which can be synchronously demodulated to yield a periodic envelope containing integral harmonics of the oscillating gradient frequency. This periodic envelope is subjected to synchronous detection, continuously yielding the amplitudes of the individual harmonic components of the envelope which are then used to approximate an integral equation by a matrix solution to a linear transformation which generates the Radon transform of the transverse magnetization along the direction of the oscillating gradient, permitting image reconstruction. Truncation (Gibbs) artefacts are eliminated. Synchronous demodulation and synchronous detection of the impulse spectrum of the output signal from the receiver coil suppresses the continuous spectrum Johnson noise. The very weak higher harmonics are synchronously detected over multiple periods yielding an improved estimate of their central tendency.

Abstract translation: 使用弱振荡梯度来调制磁共振成像设备中的自旋的角动量，从而产生接收器线圈中的输出信号，该信号可被同步解调，以产生包含振荡梯度频率的积分谐波的周期性包络。 该周期性包络经受同步检测，连续地产生包络的各个谐波分量的振幅，然后将其用于通过矩阵解近似积分方程，该线性变换产生沿着该方向的横向磁化的Radon变换 的振荡梯度，允许图像重建。 截断（Gibbs）文物被消除。 来自接收器线圈的输出信号的脉冲频谱的同步解调和同步检测抑制了连续谱约翰逊噪声。 在多个时期同步检测到非常弱的高次谐波，从而对其中心趋势进行了改进的估计。

公开(公告)号：US20050052182A1

公开(公告)日：2005-03-10

申请号：US10902263

申请日：2004-07-30

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: A61B20060101 ,  A61B5/05 ,  G01R33/28 ,  G01R33/48 ,  G01V3/00

CPC classification number: G01R33/422 ,  A61B5/0035 ,  A61B5/0536 ,  A61B5/0555 ,  A61B5/708 ,  G01R33/28 ,  G01R33/30 ,  G01R33/4808

Abstract: A method of measurement of or mapping the distribution of complex permittivity, complex conductivity, complex impedance, or electric loss angle during magnetic resonance imaging or analysis. The method includes applying a time-varying electric field of a Faraday shield to a sample and cross-correlating the line spectrum signal so produced with the voltage applied to the Faraday shield in a detection circuit. The method permits non-contrast magnetic resonance screening for breast cancer in vivo and/or continuous measurement of electrical characteristics of materials at variable frequencies in vitro. A system of detecting and evaluating sample pathology includes a Faraday shield device that includes parallel electrodes oriented orthogonal to the static magnetic field of a MRI device to produce a time varying electric field. A detector is coupled to the MRI device to detect at least one of a complex permittivity, a complex conductivity, and an electrical impedance of the sample.

Abstract translation: 在磁共振成像或分析期间测量复合介电常数，复电导率，复阻抗或电损耗角分布的方法。 该方法包括将法拉第屏蔽的时变电场施加到样本，并将所产生的线谱信号与检测电路中施加到法拉第屏蔽的电压互相关。 该方法允许体内乳腺癌的非对比磁共振筛选和/或在体外以不同频率连续测量材料的电特性。 检测和评估样本病理学的系统包括法拉第屏蔽装置，其包括垂直于MRI装置的静磁场定向的平行电极，以产生时变电场。 检测器耦合到MRI装置以检测样品的复介电常数，复电导率和电阻抗中的至少一个。

公开(公告)号：US6166540A

公开(公告)日：2000-12-26

申请号：US885925

申请日：1997-06-30

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: G01R33/44 ,  G01V3/20 ,  G01V3/32 ,  G01V3/00

CPC classification number: G01V3/20 ,  G01N24/081 ,  G01V3/32

Abstract: A method for determining petrophysical properties of geological structures using nuclear magnetic resonance utilizes a well logging apparatus and estimates resistivity in the formation surrounding a borehole by measuring current field strength and distribution.

Abstract translation: 使用核磁共振测定地质结构的岩石物理性质的方法利用测井装置，并通过测量当前的场强和分布来估计钻孔周围的地层中的电阻率。

公开(公告)号：US08929970B2

公开(公告)日：2015-01-06

申请号：US13472084

申请日：2012-05-15

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: A61B5/05 ,  G01R33/48 ,  G01R33/28

CPC classification number: G01R33/422 ,  A61B5/0035 ,  A61B5/0536 ,  A61B5/0555 ,  A61B5/708 ,  G01R33/28 ,  G01R33/30 ,  G01R33/4808

Abstract: A method of measurement of or mapping the distribution of complex permittivity, complex conductivity, complex impedance, or electric loss angle during magnetic resonance imaging or analysis. The method includes applying a time-varying electric field of a Faraday shield to a sample and cross-correlating the line spectrum signal so produced with the voltage applied to the Faraday shield in a detection circuit. The method permits non-contrast magnetic resonance screening for breast cancer in vivo and/or continuous measurement of electrical characteristics of materials at variable frequencies in vitro. A system of detecting and evaluating sample pathology includes a Faraday shield device that includes parallel electrodes oriented orthogonal to the static magnetic field of a MRI device to produce a time varying electric field. A detector is coupled to the MRI device to detect at least one of a complex permittivity, a complex conductivity, and an electrical impedance of the sample.

Abstract translation: 在磁共振成像或分析期间测量复合介电常数，复电导率，复阻抗或电损耗角分布的方法。 该方法包括将法拉第屏蔽的时变电场施加到样本，并将所产生的线谱信号与检测电路中施加到法拉第屏蔽的电压互相关。 该方法允许体内乳腺癌的非对比磁共振筛选和/或在体外以不同频率连续测量材料的电特性。 检测和评估样本病理学的系统包括法拉第屏蔽装置，其包括垂直于MRI装置的静磁场定向的平行电极，以产生时变电场。 检测器耦合到MRI装置以检测样品的复介电常数，复电导率和电阻抗中的至少一个。

公开(公告)号：US08200309B2

公开(公告)日：2012-06-12

申请号：US10902263

申请日：2004-07-30

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: A61B5/05

CPC classification number: G01R33/422 ,  A61B5/0035 ,  A61B5/0536 ,  A61B5/0555 ,  A61B5/708 ,  G01R33/28 ,  G01R33/30 ,  G01R33/4808

Abstract: A method of measurement of or mapping the distribution of complex permittivity, complex conductivity, complex impedance, or electric loss angle during magnetic resonance imaging or analysis. The method includes applying a time-varying electric field of a Faraday shield to a sample and cross-correlating the line spectrum signal so produced with the voltage applied to the Faraday shield in a detection circuit. The method permits non-contrast magnetic resonance screening for breast cancer in vivo and/or continuous measurement of electrical characteristics of materials at variable frequencies in vitro. A system of detecting and evaluating sample pathology includes a Faraday shield device that includes parallel electrodes oriented orthogonal to the static magnetic field of a MRI device to produce a time varying electric field. A detector is coupled to the MRI device to detect at least one of a complex permittivity, a complex conductivity, and an electrical impedance of the sample.

Abstract translation: 在磁共振成像或分析期间测量复合介电常数，复电导率，复阻抗或电损耗角分布的方法。 该方法包括将法拉第屏蔽的时变电场施加到样本，并将所产生的线谱信号与检测电路中施加到法拉第屏蔽的电压互相关。 该方法允许体内乳腺癌的非对比磁共振筛选和/或在体外以不同频率连续测量材料的电特性。 检测和评估样本病理学的系统包括法拉第屏蔽装置，其包括垂直于MRI装置的静磁场定向的平行电极，以产生时变电场。 检测器耦合到MRI装置以检测样品的复介电常数，复电导率和电阻抗中的至少一个。

公开(公告)号：US06342784B1

公开(公告)日：2002-01-29

申请号：US09567117

申请日：2000-05-08

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: G01V300

CPC classification number: G01V3/20 ,  G01N24/081 ,  G01V3/32

Abstract: There is provided a method and apparatus for determining resistivity in a formation surrounding a borehole. In one embodiment, the apparatus includes a magnetic resonance well logging tool disposed on said borehole, the magnetic resonance well logging tool producing a magnetic resonance sensitive volume thereabout, and a detector that selectively measures current flow in the formation both perpendicular to and parallel to the borehole axis within and adjacent to the sensitive volume.

Abstract translation: 提供了一种用于确定围绕钻孔的地层中的电阻率的方法和装置。 在一个实施例中，该装置包括设置在所述钻孔上的磁共振测井工具，磁共振测井工具在其周围产生磁共振敏感体积，以及检测器，其选择性地测量地层中的电流，垂直于和平行于该平面 钻孔轴位于敏感体积内并与之相邻。

公开(公告)号：US5412322A

公开(公告)日：1995-05-02

申请号：US81188

申请日：1993-06-24

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: A61B5/055 ,  G01F1/716 ,  G01R33/34 ,  G01R33/385 ,  G01R33/28

CPC classification number: G01R33/385 ,  G01F1/716 ,  G01R33/34046

Abstract: An MRI apparatus comprises a magnet system producing a homogeneous magnetic field along the z axis. A plurality of wire conductors arranged in a "bird cage" configuration are supplied with a circularly rotating RF field centered near the Larmor frequency .omega..sub.o. The wire conductors receive a voltage source V.sub.p having a frequency .omega..sub.p, which is less than the Larmor frequency. The voltage source V.sub.p rotates about the wire conductors at a frequency of .omega..sub.s, which is much less than the frequency .omega..sub.p, to successively apply the voltage V.sub.p to each pair of diametrically opposed wire conductors in a manner which is ordered as a spatial cylindrical harmonic rotating at a frequency .omega..sub.s. The voltage source V.sub.p produces electric fields in the object which generate linear magnetic field gradients in the object. The voltage source V.sub.p phase encodes the detected signals which thereby enables a transverse magnetization at each point within the object to be rapidly mapped back by projection techniques. Alternately, the transverse magnetization can be mapped back by an inverse transformation of a complex plane extending from the measured region by analytic continuation or by a linear transformation utilizing the solutions to Sommerfeld's Integral. The complex permittivity or ionic mobility may be continuously measured through its effect on the transverse magnetization for analysis or process control. The apparatus rapidly and continuously produces an image of the object without requiring conventional gradient field coils or any mechanical moving parts.

Abstract translation: MRI装置包括沿z轴产生均匀磁场的磁体系统。 以“鸟笼”结构布置的多个导线导体被提供有以Larmor频率ωo为中心的圆周旋转RF场。 导线接收具有小于拉莫尔频率的频率ωp的电压源Vp。 电压源Vp围绕电线导体旋转，ωω的频率远小于ωω的频率，以按照空间圆柱体的顺序将电压Vp连续地施加到每对直径相对的导线上 谐波以ωω旋转。 电压源Vp在物体中产生电场，在物体中产生线性磁场梯度。 电压源Vp相位对检测到的信号进行编码，由此能够通过投影技术快速映射物体内的每个点的横向磁化。 或者，横向磁化可以通过分析延续从测量区域延伸的复平面的逆变换或利用索默费尔德积分的解的线性变换来映射回来。 复介电常数或离子迁移率可以通过其对横向磁化的影响来连续测量，用于分析或过程控制。 该装置快速且连续地产生物体的图像，而不需要常规的梯度场线圈或任何机械运动部件。

公开(公告)号：US06545471B2

公开(公告)日：2003-04-08

申请号：US10011751

申请日：2001-12-11

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: G01V300

CPC classification number: G01V3/20 ,  G01N24/081 ,  G01V3/32

Abstract: A method for determining petrophysical properties of geological structures using nuclear magnetic resonance utilizes a well logging apparatus and estimates resistivity in the formation surrounding a borehole by measuring current field strength and distribution.

公开(公告)号：US06452390B1

公开(公告)日：2002-09-17

申请号：US09711914

申请日：2000-11-15

Applicant: Ernest Wollin

Inventor： Ernest Wollin

IPC: G01V300

CPC classification number: G01F1/716

Abstract: A simplified magnetic resonance flowmeter and flow measuring method, based on the dwell time of spins in the H1 Larmor radio frequency nutation field, which employs periodic H0 field gradients to phase modulate the spins so as to measure mean velocity of flow in near uniform velocity profiles or to map velocity of flow in non-uniform velocity profiles, which does not require pulse techniques and is relatively independent of relaxation and diffusion parameters consisting of a magnetizing section of pipe with a strong H0 magnetic field with a receiving section with orthogonal periodic phase modulating gradient coils, H1 Larmor radio frequency excitation (nutation) coils, and sideband receiver coils; utilizing a demodulating and cross-correlating receiver and a control system that permits concordant analysis of composition.

Abstract translation: 一种简化的磁共振流量计和流量测量方法，基于H1 Larmor射频章动场中的自旋停留时间，其采用周期性H0场梯度来相位调制自旋，以便在近均匀速度分布中测量平均流速 或者以非均匀速度分布图来描绘流速，其不需要脉冲技术，并且相对独立于由具有强H0磁场的管的磁化部分组成的弛豫和扩散参数，具有正交周期性相位调制的接收部分 梯度线圈，H1 Larmor射频激励（章动）线圈和边带接收线圈; 利用解调和互相关的接收机和允许组合的一致分析的控制系统。