What should you do with the ultrasonography machine after the prescribed time?

• A. Increase the intensity for the next patient
• B. Turn off the machine
• C. Return the intensity control back to zero
• D. Leave at the current setting

Answer: (C)

Resetting the ultrasound machine to a safe default after use is about preventing any unintended energy delivery and keeping the device ready for the next patient. Returning the intensity control back to zero ensures no acoustic energy is emitted when the machine isn’t actively being used, protecting patients from unnecessary exposure and preventing heating of tissues. It also helps minimize wear on the transducer and keeps the equipment in a consistent, predictable state for the next exam. While turning the machine off and other steps can be part of shutdown procedures, setting the output back to zero specifically addresses safety by eliminating residual energy. Increasing the intensity or leaving the current setting could lead to accidental exposure or discomfort for the next patient.