Fig. 1

Schematic illustration of the imaging protocol, divided into three phases. Each phase included acquisition of localizers (Loc), two proton density weighted (PDw) images, one main pulmonary artery flow, followed by two additional proton density weighted images. Subjects were in the supine position in the first phase, in the prone position for the second phase, and back into a supine position for the third phase. Repositioning of the subject, coils, running calibrations and localizers took approximately 6 min