Patent ID: 8473536
Filing Date: 2013-06-25
Classification: G01R

Abstract:
1. A computer implemented method for providing an adiabatic RF pulse that is an inversion or refocusing pulse for a RF pulse sequence, for a magnetic resonance imaging system, comprising: determining a linear phase frequency profile (F applying a quadratic phase to the linear phase frequency profile for the adiabatic RF pulse to obtain F(ω), wherein the applying the quadratic phase comprises setting F(ω)=F setting a polynomial β=Fourier Transform (F(ω)); determining a corresponding minimum phase a polynomial for the β polynomial; setting (α,β) as inputs to an inverse Shinnar Le-Roux transform to generate an adiabatic RF waveform; and truncating the adiabatic RF waveform to produce the adiabatic RF pulse, wherein a pulse duration and a transition width is specified, wherein k>0.03π/(effective transition width) where effective transition width is given by (ω