Probes used for therapeutic ultrasound or continuous wave Doppler typically do what regarding backing material and pulse duration?

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Multiple Choice

Probes used for therapeutic ultrasound or continuous wave Doppler typically do what regarding backing material and pulse duration?

Explanation:
In ultrasound transducers, backing material acts as a damper. It shortens the emitted pulse and broadens the bandwidth by absorbing energy and quickly stopping the crystal’s vibration. For therapeutic ultrasound and continuous wave Doppler, the goal is to deliver energy over a longer time or at a steady single frequency, so you want the crystal to ring longer and maintain a narrow spectral content. That’s achieved by not using backing material, which yields a long pulse (or continuous output) with a narrow bandwidth.

In ultrasound transducers, backing material acts as a damper. It shortens the emitted pulse and broadens the bandwidth by absorbing energy and quickly stopping the crystal’s vibration. For therapeutic ultrasound and continuous wave Doppler, the goal is to deliver energy over a longer time or at a steady single frequency, so you want the crystal to ring longer and maintain a narrow spectral content. That’s achieved by not using backing material, which yields a long pulse (or continuous output) with a narrow bandwidth.

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