Van Ngoc Do

US Patent:

20130162247, Jun 27, 2013

Filed:

Dec 27, 2011

Appl. No.:

13/338083

Inventors:

MARTIN D. HÜRLIMANN - NEWTON MA, US
SOUMYAJIT MANDAL - CAMBRIDGE MA, US
VAN MAI DO - CAMBRIDGE MA, US

International Classification:

G01V 3/14

US Classification:

324303

Abstract:

Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.

US Patent:

20170357025, Dec 14, 2017

Filed:

Apr 21, 2017

Appl. No.:

15/494009

Inventors:

- Sugar Land TX, US
SOUMYAJIT MANDAL - CAMBRIDGE MA, US
VAN MAI DO - CAMBRIDGE MA, US
YI-QIAO SONG - NEWTON CENTER MA, US

International Classification:

G01V 3/32
G01R 33/561
G01N 24/08
G01R 33/44
G01R 33/38

Abstract:

Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.