×

Method for performing magnetic resonance spectroscopy or tomography in a preselectable region of a material

  • US 5,317,264 A
  • Filed: 05/20/1993
  • Issued: 05/31/1994
  • Est. Priority Date: 03/15/1989
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of performing magnetic resonance spectroscopy or tomography in a preselected sample region having a net nuclear magnetization direction and being positioned in a homogeneous external magnetic field having a field direction, said method comprising the steps of:

  • A. applying a first RF pulse to at least the preselected region, the RF pulse having a direction and magnitude selected to create a first nuclear magnetization component in a direction transverse to the field direction;

    B. applying, to refocus the first nuclear magnetization at a time t, a first constant magnetic field gradient having a direction to at least the preselected region for a predetermined time interval following the application of the RF pulse in step A;

    C. applying, beginning at time t, a second RF pulse during the predetermined time interval in step B wherein said second rf pulse is a spin lock pulse;

    D. applying a third RF pulse to at least the preselected region, the third RF pulse having a direction and magnitude selected to transfer the first nuclear magnetization component into the field direction;

    E. removing the first constant magnetic field gradient;

    F. applying a fourth RF pulse to at least the preselected region, the fourth RF pulse having a direction and magnitude selected to create a second nuclear magnetization component in a direction transverse to the field direction; and

    G. detecting an induction signal produced by the second nuclear magnetization component.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×