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. 2021 Jan 21;31(7):5335–5343. doi: 10.1007/s00330-020-07679-8

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© The Author(s) 2021

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Fig. 3 — Histogram corresponding to the levels of degradation (1–7, corresponding index 1 to reference image) that radiologists selected as still acceptable in images with lower resolution and quantum noise for (top row) calcification cases; and (bottom row) soft tissue cases