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Illustration of the derating method based on scaling source pressure. Axial distributions of the pressure amplitude in linear focused beam in tissue (solid line) and in water (dashed line). Pressure is normalized by the source pressure in water, the focusing gain of the source G = 40, absorption in tissue αF = 1, source pressure in tissue is exp(1)=2.7 times higher than in water so that to compensate absorption in the prefocal path and provide the same focal pressure as in water.
