Initial power is determined by what?

Initial power is determined by what?

• A. Tissue properties
• B. Sound source
• C. Receiver sensitivity
• D. Patient position

Answer: (B)

The initial power of the ultrasound pulse is set by the sound source—the transducer and the system’s transmit power setting. The transducer converts electrical energy into acoustic energy, and the voltage waveform driving it determines the pulse’s amplitude and energy, i.e., its initial power. Tissue properties affect how the wave travels, including attenuation, impedance, and reflections, which influence what is received, not what is emitted. Receiver sensitivity concerns how well echoes are detected, not how much energy is produced at the source. Patient position can change the path and amount of attenuation the wave encounters, but it doesn’t determine the emitted power.

The initial power of the ultrasound pulse is set by the sound source—the transducer and the system’s transmit power setting. The transducer converts electrical energy into acoustic energy, and the voltage waveform driving it determines the pulse’s amplitude and energy, i.e., its initial power. Tissue properties affect how the wave travels, including attenuation, impedance, and reflections, which influence what is received, not what is emitted. Receiver sensitivity concerns how well echoes are detected, not how much energy is produced at the source. Patient position can change the path and amount of attenuation the wave encounters, but it doesn’t determine the emitted power.