effective radiating area


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effective radiating area

the total area of the surface of the transducer that actually produces the sound wave.

effective radiating area

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ERA

The area of a therapeutic ultrasound head that produces useful ultrasonic energy, measured in square centimeters (cm2). The effective radiating area is calculated by identifying all points where the ultrasonic energy is at least 5% of the maximum measured intensity at the transducer's surface.
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