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Acoustic absorption has been measured in a series of biological tissue specimens-porcine muscle, renal and fat tissues-by the standard insert-substitution method, as well as by ultrasonic phase conjugation. Comparison of the experimental results and revealed differences confirm the promise of using phase conjugate waves to measure acoustic losses in biological objects. It is demonstrated that in inhomogeneous tissues, the phase conjugation method makes it possible to obtain a more reliable estimate of dissipative losses. [ABSTRACT FROM AUTHOR]