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(a) Optical imaging of colloidal dispersion of KYF:Er,Yb@KYF:Nd,Yb nanoparticles (50 mg/mL) in a NMR tube, covered by a chicken breast slab (thickness of 4 mm), and (b) profile of the radiance evaluated perpendicularly to the NMR tube. (c) T2-weighted MRI of KYF:Er,Yb@KYF:Gd nanoparticles injected in a slice of chicken breast in comparison with commercial Magnevist solution.
