简介：Ultrasonicbiophysicistsandphysicianshavecontinuouslyexhibitedgreatinterestinstudyingtheultrasonicpropertiesofblood.Itisshownthatcompressibilityofredcellappearstobeinverselypropor-tionalwithitshemoglobincontent.Amongultrasonicattenuationproducedbyredcellstructurelevelinblood,absorptionofredcellplayspredominantrole,viscousrelativemotionlossaccountsforlessthan15%,andcellscatteringcontributionisnegligible.Thecoagulationprocessofbloodisaccompaniedbysignificantchangeofsoundparameters.Themarkedadvantagehasbeenfoundintestofbloodcoagula-tionprocessbyusingultrasonictechniquethanthetraditionalviscousmethod.Bloodcoagulationcausessoundattenuation,soundbackscatteringandnonlinearityparameterB/Atoincrease,buttheattenuationfrequencydependencehardlychanges.Allofthesefindingsareofanimportantrealisticsignifi-cancefordevelopingultrasonicmedicine.
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