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Calibration spectra for various ROI sizes. (a) B-mode image of the calibration phantom with ROIs centered at 1 cm depth: ROI I (3.0×0.5 cm2) dotted lines, ROI II (3.0×1 cm2) dashed lines, and ROI III (3.0×1.5 cm2) solid lines. (b) 1D power spectra for ROIs shown in (a).
