Which statement is true about pulse duration?

Which statement is true about pulse duration?

• A. It is determined by the sound source only.
• B. It depends on tissue properties.
• C. It depends on receiver settings.
• D. It can be altered by adjusting depth.

Answer: (A)

Pulse duration is set by the sound source—the transmitter and transducer determine how long the emitted burst lasts, based on how many cycles are produced and their period. Tissue properties affect how sound travels afterward—speed and attenuation—but they don’t change the length of the emitted pulse. Receiver settings influence how echoes are processed and displayed, not the duration of the pulse itself, and changing depth only alters the imaging window for echoes, not the pulse duration. So the emitted pulse duration is governed by the sound source alone.

Pulse duration is set by the sound source—the transmitter and transducer determine how long the emitted burst lasts, based on how many cycles are produced and their period. Tissue properties affect how sound travels afterward—speed and attenuation—but they don’t change the length of the emitted pulse. Receiver settings influence how echoes are processed and displayed, not the duration of the pulse itself, and changing depth only alters the imaging window for echoes, not the pulse duration. So the emitted pulse duration is governed by the sound source alone.