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. 2016 Feb 23;6:21798. doi: 10.1038/srep21798

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Copyright © 2016, Macmillan Publishers Limited

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(a) The spectral slope value of the enamel is estimated from randomly selected squares with a size of 0.6 mm × 0.6 mm shown as the white box. The slope value of the dentin is estimated from a square with a size of 2.3 mm × 2.3 mm shown as the black box. (b) The slope value of enamel and dentin of several specimens. For the lesion tooth [T4 and T5], the box selection excludes the lesion regions. For all specimens, the enamel has a spectral slope (mean ± SD) of −1.70 ± 0.34 dB/MHz and the dentin has a spectral slope (mean ± SD) of −2.45 ± 0.31 dB/MHz.