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Flow insensitive magnetization preparation pulse for T2* contrast

  • US 9,507,000 B2
  • Filed: 10/05/2009
  • Issued: 11/29/2016
  • Est. Priority Date: 10/13/2008
  • Status: Expired due to Fees
First Claim
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1. A magnetic resonance imaging method, comprising:

  • controlling a magnetic resonance imaging system to generate a magnetization preparation pulse subsequence, wherein the magnetization preparation pulse subsequence includes;

    a narrow bandwidth excitation pulse having a duration which is longer than a dephasing time T2* of a short T2* species and which tips spins predominantly of long T2* species out of a longitudinal direction of a main magnetic field while predominantly leaving the short T2* species unaffected,a wide bandwidth spin refocusing pulse having a duration which is shorter than the dephasing time T2* of the short T2* species and which predominantly refocuses the long T2* species and predominantly inverts spins of the short T2* species, anda wide bandwidth restoring pulse having a duration which is shorter than the dephasing time T2* of the short T2* species and which predominantly returns spins of the long T2* species back to the longitudinal direction of the main magnetic field and predominantly tips the spins of the short T2* species out of the longitudinal direction of the main magnetic field,wherein the narrow bandwidth excitation pulse, the wide bandwidth spin refocusing pulse, and the wide-bandwidth restoring pulse all have a same center frequency as each other;

    controlling the magnetic resonance imaging system to generate an imaging pulse subsequence to perform magnetic resonance imaging data acquisition following the magnetization preparation pulse subsequence; and

    processing, by the magnetic resonance imaging system, the magnetic resonance imaging data,wherein the magnetic resonance imaging data provides blood oxygenation level dependent contrast.

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