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An Overview of Thermal and Mechanical Acoustic Output Indices

D. L. Hykes, MS

Radiology Department, Aultman Hospital, Canton, Ohio; Radiology Department, St. Joseph Hospital and Health Center, Lorain, Ohio; Northeastern Ohio Universities College of Medicine, Rootstown, Ohio

Thermal and mechanical indices are acoustic output descriptors that provide a means of assessing the potential for biologic effects from exposure to diagnostic ultrasound. Models and assumptions used in the estimation of acoustic output indices are discussed with illustrative diagrams. The defining equation for each index is presented. Safety guidelines based on the index values are reviewed.

Key Words: thermal index • mechanical index • safety • biologic effects • clinical guidelines

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