公开(公告)号：US10655996B2

公开(公告)日：2020-05-19

申请号：US15484665

申请日：2017-04-11

Applicant: Aspect Imaging Ltd.

Inventor： Peter Bendel ,  Boaz Shapira

IPC: G01F1/716 ,  G01N24/08 ,  G01R33/563 ,  G01R33/483

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：US10261146B2

公开(公告)日：2019-04-16

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 ,  G01R33/565

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.

公开(公告)号：US10890636B2

公开(公告)日：2021-01-12

申请号：US14700205

申请日：2015-04-30

Applicant: ASPECT IMAGING LTD.

Inventor： Boaz Shapira

IPC: G01R23/00 ,  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.