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Measurement Accuracy

Because this article has no abstract, we have provided an extract of the full text and any section headings.

To the Editor:

As an ultrasound device manufacturer, I read with great interest "A Calibration Study of Therapeutic Ultrasound Units" in the March 2002 issue of Physical Therapy. I applaud the efforts of the authors in promoting an awareness that therapeutic ultrasound devices need to be calibrated annually as per the recommendations of the Food and Drug Administration (FDA).

The results of the study, however, should be taken with a grain of salt. The wattmeter used to check the calibration of the equipment is not approved by the FDA, and I contend that measuring ±20% with a meter that has an accuracy of ±10% is really not good science when FDA-approved meters with an accuracy of ±3% (eg, a device produced by Ohmic Instruments^*) are available.

I would encourage a new study that utilizes state-of-the-art technology to perform the measurements. I think the findings would show a strong . . . [Full Text of this Article]

Ken Coffey

President/CEO
Rich-Mar Corp

Denes Roveti

Technical Director
Ohmic Instruments Company

Jean-Michel Brismée

Assistant Professor
Physical Therapy Program
Texas Tech University Health Sciences Center
Amarillo, TX 79106
(brismee@ama.ttuhsc.edu)

Neal Latman

Associate Professor
Texas Tech University Health Sciences Center

Paul Artho

Physical Therapist
BSA Hospital
Amarillo, Tex

Steven Sawyer

Associate Professor
Texas Tech University Health Sciences Center

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Related Article

A Calibration Study of Therapeutic Ultrasound Units

Paul A Artho, Jason G Thyne, Barry P Warring, Chris D Willis, Jean-Michel Brismée, and Neal S Latman
Physical Therapy 2002 82: 257-263. [Abstract] [Full Text] [PDF]

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