Which method reduces ringing after the ultrasound system has excited the crystal?

Which method reduces ringing after the ultrasound system has excited the crystal?

• A. Dampen the crystal
• B. Increase the length of the pulse
• C. Amplify the crystal
• D. Delay the signal

Answer: (A)

Ringing is the lingering vibration of the transducer crystal after it has been excited. To reduce this post-excitation ringing, you damp the crystal. Damping introduces energy loss quickly, lowering the system’s Q factor so the crystal dissipates energy faster. The result is a shorter pulse with a broader bandwidth, which minimizes the prolonged oscillations and improves axial resolution. Increasing the pulse length would actually prolong ringing, amplifying the crystal doesn’t address the lingering vibration, and delaying the signal changes timing but doesn’t stop the crystal from vibrating. Therefore, damping the crystal is the correct approach.

Ringing is the lingering vibration of the transducer crystal after it has been excited. To reduce this post-excitation ringing, you damp the crystal. Damping introduces energy loss quickly, lowering the system’s Q factor so the crystal dissipates energy faster. The result is a shorter pulse with a broader bandwidth, which minimizes the prolonged oscillations and improves axial resolution. Increasing the pulse length would actually prolong ringing, amplifying the crystal doesn’t address the lingering vibration, and delaying the signal changes timing but doesn’t stop the crystal from vibrating. Therefore, damping the crystal is the correct approach.