From a safety standpoint, which method is best?

• A. Low transmit output and high receiver gain
• B. High transmit output and low receiver gain
• C. High near gain and low far gain
• D. Low near gain and high far gain

Answer: (A)

From a safety perspective, the key factor is the energy delivered to the tissue, which comes from the transmit power. Keeping transmit output low minimizes exposure, and you can use higher receiver gain to boost the strength of the echoes you actually receive without increasing the energy sent into the patient. This aligns with ALARA principles: reduce the potential for tissue heating and mechanical effects while maintaining image quality through signal amplification. Increasing transmit output would raise exposure, and lowering receiver gain would reduce signal quality. Adjusting near versus far gain changes how amplification is distributed with depth but does not affect the actual energy emitted.