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We quantify here, for the first time, the intracellular uptake (J774A.1 murine macrophage cells) of gadolinium‐loaded ultra‐short single‐walled carbon nanotubes (gadonanotubes or GNTs) in a 3 T MRI scanner using R2 and R2* mapping in vitro. GNT‐labeled cells exhibited high and linear changes in net transverse relaxations (ΔR2 and ΔR) with increasing cell concentration. The measured ΔR2* were about...
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