×

Imaging of turbulence with magnetic resonance

  • US 5,277,192 A
  • Filed: 09/18/1992
  • Issued: 01/11/1994
  • Est. Priority Date: 09/18/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for obtaining magnetic resonance (MR) images of turbulence of fluid within a subject situated in a substantially homogeneous magnetic field comprising the steps of:

  • a) applying a slice-selective MR excitation pulse to excite a slice of said subject;

    b) applying a flow-encoding magnetic field gradient pulse to the excited slice;

    c) applying a readout magnetic field gradient pulse to the excited slice at a selected projection angle θ

    m m=1,2,3, . . . M where M represents a total number of projection angles;

    d) collecting an MR signal from said subject responsive to the MR excitation and magnetic field gradient pulses;

    e) Fourier transforming the MR signal to result in a set of flow velocity values for each position xi along an axis in a direction of the selected projection angle;

    f) repeating steps "a"-"e" during a single cardiac cycle of said subject to obtain a plurality of sets of flow velocity values;

    g) repeating steps "a"-"f" for a plurality of N cardiac cycles of said subject to obtain N sets of sets of flow velocity values; and

    h) producing a projection pm being a turbulence vs. position image of fluid within said subject by determining the standard deviation of the sets of flow velocity values for each position xi of the projection angle θ

    m.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×