A reduced-FOV method for CINE MRI

Introduction: Several MRI applications involve imaging a dynamic object to resolve its temporal behavior. In such applications, it is often difficult to achieve the desired temporal resolution while maintaining the required spatial resolution and fieldof-view (FOV). Methods have been developed to increase the temporal resolution in the special case where only a fraction of the FOV undergoes dynamic changes [l-4]. Although cardiac imaging is an important example of an imaging application where motion is concentrated into only a part of the FOV, the reduced-FOV (rFOV) methods mentioned above are not compatible with one of the most common cardiac sequences, so-called ‘retrospective’ CINE imaging. The present work is a rFOV method designed to be compatible with CINE imaging, providing a decrease by a factor n in scan time (or an increase by a factor n in temporal resolution) if only l/nth of the FOV is dynamic, the rest being considered static.