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. 2021 Aug 2;35(5):671–709. doi: 10.1007/s00540-021-02967-z

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© The Author(s) 2021

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Fig. 2 — Simulations considering the effects of tissues. Changes in the attenuation ratio when tissue pulsation is absent and only oxygen saturation changes. Changes in the attenuation ratio when oxygen saturation is constant and the tissue thickness changes