1. An imaging scanner comprising: a plurality of gradient coils positioned about a bore of a magnet to impress a polarizing field therein; an RF coil assembly coupled to a pulse generator to emit an RF pulse sequence and arranged to receive resulting MR signals from a subject of interest in the bore; a detector positioned to detect PET emissions from the subject of interest; a coincidence processor configured to receive an output from the detector; and a blanking control configured to identify periods during which PET detection may be compromised.