Echoes across the diaphragm.

@article{Cosgrove1978EchoesAT,
  title={Echoes across the diaphragm.},
  author={David Cosgrove and P. Garbutt and C. R. Hill},
  journal={Ultrasound in medicine & biology},
  year={1978},
  volume={3 4},
  pages={
          385-92
        }
}
The echoes appearing above the diaphragm in liver sector scans are attributed to acoustic scattering structures in the liver, the ultrasound being reflected back to the transducer by the air-backed diaphragm, which acts as a sound mirror. The hypothesis is evidenced by observations of pathology in the upper portion of the liver and by investigations in vitro. 

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