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(a) CT-based phase shifts (°) as a function of hydrophone-measured phase shifts (°) and (b) histogram of the phase differences in skull caps Sk1-4. (c) CT-based phase shifts (°) as a function of hydrophone-measured phase shifts (°) and (d) histogram of the phase differences in skull caps Sk1-4, excluding the measured spots with incident angle ≥ 5°. Solid and dotted lines denote 0° and ± 45° in phase differences between the two modalities, respectively.
