公开(公告)号：US20170292866A1

公开(公告)日：2017-10-12

申请号：US15484665

申请日：2017-04-11

Applicant: Aspect Imaging Ltd.

Inventor： Peter BENDEL ,  Boaz SHAPIRA

IPC: G01F1/716 ,  G01N24/08

CPC classification number: G01F1/716 ,  G01N24/081 ,  G01R33/4838 ,  G01R33/56308

Abstract: Method of determining a velocity profile of a fluid flowing through a conduit, the method including applying a saturation pulse on spins of magnetic field-sensitive nuclei in the fluid, measuring a signal of the fluid to determine position of the magnetic field-sensitive nuclei, the measurement carried out at a recovery time ‘TR’ and at a distance ‘d’ within the conduit, determining within the conduit a radial distance ‘r’ characterized by a local minimum in the measured signal, wherein the radial distance ‘r’ is measured from the center of the conduit, and determining a velocity profile of the fluid at the radial distance, based on the magnetic field-sensitive nuclei.

公开(公告)号：US20150338493A1

公开(公告)日：2015-11-26

申请号：US14700205

申请日：2015-04-30

Applicant: ASPECT IMAGING LTD.

Inventor： Boaz SHAPIRA

IPC: G01R33/565 ,  G01R33/385 ,  G01R33/383

CPC classification number: G01R33/383 ,  G01R33/565

Abstract: A method of determining the frequency and amplitude of a perturbing cyclic EM signal in the field of view of an NMR or MRI system during acquisition of a spin-echo spectrum. The frequency ν of the perturbing electromagnetic signal is determined by acquiring a plurality of n 2D NMR spectra with n different values of TR; selecting a peak in each of the n NMR spectra; determining the area of the peak; calculating possible frequencies along the ΩTR axis; and eliminating results that do not match the position along the Ωτ axis, thereby obtaining ν. The amplitude α of the perturbing electromagnetic signal is determined by calculating the square of the area of the peak.

Abstract translation: 在采集自旋回波光谱期间在NMR或MRI系统的视野中确定扰动循环EM信号的频率和振幅的方法。 频率＆ngr 通过获得具有n个不同值的TR的n个2D NMR谱来确定扰动电磁信号; 在每个n NMR谱中选择一个峰; 确定峰值面积; 计算沿着＆OHgr; TR轴的可能频率; 并消除与＆OHgr;τ轴位置不匹配的结果，从而获得＆ngr。 扰动电磁信号的振幅α通过计算峰面积的平方来确定。

公开(公告)号：US20170336489A1

公开(公告)日：2017-11-23

申请号：US15523228

申请日：2015-11-01

Applicant: ASPECT IMAGING LTD.

Inventor： Peter BENDEL ,  Boaz SHAPIRA

IPC: G01R33/563 ,  G01R33/483 ,  G01R33/48

CPC classification number: G01R33/56333 ,  G01R33/4816 ,  G01R33/4835 ,  G01R33/56308

Abstract: An MRI-based method for determining a velocity profile for a fluid flowing through a pipe, said method comprising: selecting a slice through which said fluid is flowing; selecting a pulse sequence; separating said pulse sequence into a preparation part and a readout part; applying said preparation part to said slice; waiting a predetermined time Rt; and, applying said readout part to said slice.

公开(公告)号：US20150338486A1

公开(公告)日：2015-11-26

申请号：US14700207

申请日：2015-04-30

Applicant: ASPECT IMAGING LTD.

Inventor： Boaz SHAPIRA ,  Uri RAPOPORT

IPC: G01R33/56 ,  G01R33/383 ,  G01R33/561

CPC classification number: G01R33/383 ,  G01R33/5617 ,  G01R33/56563

Abstract: A method of reducing artifacts produced during Fast Spin Echo measurements made using permanent magnet NMR instruments. The method includes applying encoding gradients that do not switch signs throughout the experiment. Prior to the 90° RF pulse, a strong RM gradient pulse is given to produce a dominant and constant residual magnetization. The encoding is done through the combination of encoding gradients with the aid of the 180° RF pulses of the echo train. A first constant encoding gradient is given before the first 180 pulse. Then two variable encoding gradients are provided after each 180 pulse; one applied prior to and one applied subsequent to each acquisition in the echo train.

Abstract translation: 在使用永久磁共振仪器进行的快速自旋回波测量过程中减少伪影产生的方法。 该方法包括在整个实验中应用不切换符号的编码梯度。 在90°RF脉冲之前，给出强的RM梯度脉冲以产生显性和恒定的剩余磁化。 借助于回波串的180°RF脉冲，通过编码梯度的组合完成编码。 第一个恒定编码梯度在第一个180脉冲之前给出。 然后在每180次脉冲之后提供两个可变编码梯度; 一个应用于回波序列中的每个采集之后和之后应用。