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. 2023 May 27;18(9):1649–1663. doi: 10.1007/s11548-023-02934-x

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© The Author(s) 2023

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Fig. 2 — a (left): An example of mean gray values plotted against the nominal echo levels. The dotted line represents a linear regression of the gray values. The gradient of the linear regression is the contrast resolution. b (right): An example of how FWHM is measured. The peak of the curve represents a small marker. −6 dB is considered half the level of the maximum signal of the peak. The red striped line at −6 dB represents the full width of the peak (FWHM)