<h2>Summary</h2> The transmission of ultrasound through commercially available topical products containing non-steroidal anti-inflammatory drugs was investigated. A Bio-tek wattmeter was ued to measure percentage transmission of ultrasound relative to de-ionised degassed water at a range of ultrasound frequencies (ie 0.75, 1.5 and 3.0 MHz with total power output of 1.5 and 5 watts). Gel-based formulations were shown to transmit ultrasound efficiently at 1.5 and 3.0 MHz, but less efficiently at 0.75 MHz. The study provides information which may be useful when considering the use of topical NSAID preparations as couplants during ultrasound treatment of soft tissue injuries and musculoskeletal conditions.
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