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It is valuable information for American, Canadian, and international physical therapists, trainers, health care providers, technicians, and engineers dealing with the application and calibration of therapeutic ultrasound devices to know that the units are considered out of calibration for power output when the percentage of error of power output is beyond [+ or -] 20%. Because we guaranteed anonymity of the participants and their clinic or hospital (some clinicians were reluctant to participate in the study unless anonymity was guaranteed), it was not possible for us to evaluate the factors responsible for the large percentage of ultrasound devices (39%) found to be out of calibration for power output. |
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