You Have Examined a Transducer by Placing Cellophane Tape Around

question 22

Multiple Choice

You have examined a transducer by placing cellophane tape around the outside edges of the transducer and sealing it enough to fill with water, and then putting water on the transducer. You then turned the unit on, increased the intensity of the unit to about 1.5W/cm², and noticed that there was only a small percentage of the surface of the water that was disturbed when you looked at it from the top. What might this indicate?

• A)Nothing; this is not how you examine an ultrasound unit.
• B)The BNR of the unit was high.
• C)The effective radiating area of the unit was poor.
• D)The BNR of the unit was low.

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