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. 2021 Apr 26;11:8931. doi: 10.1038/s41598-021-88300-w

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(a) Gold seeds, (b) Polymer seeds, (c) CT of gold seeds with the defined area for the gray-scale histogram, (d) CT of polymer seeds with the defined area for the gray-scale histograms, (e) MR Co-registered with CT of gold seeds and (f) MRI Co-registered with CT of polymer seeds.