8 , 18 However, it is worth emphasizing that CT CAs are used at a much higher concentration than MRI ones; 8 , 31 , 32 , 59 hence the lower r 2 is scarcely significant for an alloy functioning as a multimodal MRI/CT CA.
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4D Multimodal Nanomedicines Made of Nonequilibrium Au-Fe Alloy Nanoparticles.
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For longer times, the contrast remains comparable in all organs, although a decreasing trend is appreciable after the first 5 days.