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MR spectrum and images of PS hollow beads whose interiors had been encapsulated with PFO: a) a 19F MR spectrum acquired from a sample containing PFO-encapsulated PS hollow beads and perfluoro-15-crown-5-ether (PFCE), a reference compound; b) 1H mapping image from a suspension containing PFO-encapsulated PS hollow beads hosted in a centrifuge tube; and c) 19F mapping image of the same sample by using the peak of PFO.
