Fast Frequency Selective Keyhole MFU

Introduction The conventional keyhole data acquisition is used to permit faster imaging procedures without loss of sensitivity in dynamic studies, where initial high-resolution spatial information is combined with low-resolution spatial information at later points in time. We propose a new Fast keyhole (FK) method, which allows dynamic acquisition of a low-resolution image signal from selected most relevant or arbitrarily chosen k-space points and reduces acquisition time of conventional keyhole approach and eliminates artifacts due to off resonance sources. The effect of the FK method on contrast in MRI is evaluated.