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Magnetic resonance tomography method with screening of signals from tissues with long transverse relaxation times

  • US 5,814,991 A
  • Filed: 04/14/1997
  • Issued: 09/29/1998
  • Est. Priority Date: 04/24/1996
  • Status: Expired due to Term
First Claim
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1. A method for operating a nuclear magnetic resonance tomography apparatus for examining first tissue in an examination subject having a first T2 time, the subject also containing tissue having a second T2 time which is longer than said first T2 time, said method comprising the steps of:

  • exciting nuclear spins in each of said first and second tissues in said subject, beginning at an excitation time, under transverse magnetization which decays with said first and second T2 time constants, obtaining a first group and a second group of locus-encoded nuclear magnetic resonance signals from said subject;

    obtaining said first group of nuclear magnetic resonance signals shortly after said excitation time;

    obtaining said second group of nuclear magnetic resonance signals after said first group in a time interval following said excitation time at which said second tissue having said second time constant supplies a predominant signal contribution to the nuclear magnetic resonance signals; and

    reconstructing an image of said examination subject containing said first and second tissues on the basis of differences in the respective content of said first and second groups of locus-encoded nuclear magnetic resonance signals having identical locus encoding.

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