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a) PSF’s full width at half maximum (FWHM) and b) peak intensity of spiral sampling at 7T. The peak intensity was normalized to the one at zero-offset frequency. Note that the FWHM linearly increases with readout at both offset frequencies while the peak intensity decreases and approaches to a limit of about 10% at 1.0ppm or about 20% at 3.4ppm at long readouts, instead of to zero due to PSF’s ring-shape distribution.
