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Magnetic resonance apparatus employing delayed self-refocusing RF excitation

  • US 5,280,245 A
  • Filed: 07/27/1992
  • Issued: 01/18/1994
  • Est. Priority Date: 07/27/1992
  • Status: Expired due to Term
First Claim
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1. A method of exciting a body with RF excitation in MRI apparatus with a self-refocusing spin echo and variable delay following the RF excitation comprising the steps of:

  • (a) placing said body in a magnetic field (BO),(b) applying an RF excitation pulse, B1 (t), to said body, said excitation pulse being defined as
    
    
    space="preserve" listing-type="equation">B.sub.1 (t)=SLR.sup.-1 {P(z) A.sub.n (z), B.sub.n (z)} whereSLR is the Shinnar-LeRoux algorithmBn (z) is a polynomial defining an FIR filterAn (z) is a minimum phase polynomial consistent with Bn (z)P(z) is a unit amplitude phase function which compensates the phase of Bn (z).

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