Sofia Chavez1, Greg Stanisz2
1Imaging Research, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; 2Sunnybrook Health Sciences Centre, Canada
A simple flip angle calibration method is introduced. It relies on the quasi-linear characteristics of the signal vs flip angle curve for a spoiled gradient recalled echo at large flip angles and for short repetition time. A straight-line extrapolation is used to determine the signal null point, occurring for a true flip angle of 180. The data at each pixel is fit to yield a map of the flip angle calibration factor (k). The resulting k map is shown to be in good agreement with that resulting from the standard double angle method in a much shorter acquisition time.