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Nuclear magnetic resonance methods and apparatus

  • US 4,683,432 A
  • Filed: 09/18/1986
  • Issued: 07/28/1987
  • Est. Priority Date: 09/25/1985
  • Status: Expired due to Fees
First Claim
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1. A method of examining a predetermined location in a body using NMR techniques comprising:

  • carrying out four separate procedures each comprising exciting spins in a region of the body including said predetermined location and acquiring and processing data in respect of said spins, the procedures differing in that in a first procedure the excited spins are of the same phase throughout said region, in a second procedure the excited spins are of a first phase in a first portion of said region of which said predetermined location forms part and of the opposite phase in the rest of said region, in a third procedure the spins are of a first phase in a second portion of said region which intersects said first poriton at said predetermined location and are of the opposite phase in the rest of said region, and in fourth procedure the spins are of a first phase in the first and second poritons, excluding said predetermined location, and are of the opposite phase in the rest of said region; and

    combining the processed data obtained in said four procedures to extract processed data relating to said predetermined location only.

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