What mechanism is responsible for sweeping the ultrasound beam in a mechanical transducer?

What mechanism is responsible for sweeping the ultrasound beam in a mechanical transducer?

• A. Electronic Beam Steering
• B. Acoustic Lens Adjustment
• C. Mechanical Movement Of The Element
• D. Phased Array Control

Answer: (C)

In a mechanical transducer, the beam is swept by physically moving the crystal assembly. A motor drives the element (and its lens) to tilt or rotate, so the emitted beam changes direction across a range of angles. As this single element sweeps, it creates the fan-shaped, sector image you see on the screen. This is different from electronic steering, which uses delays across multiple elements to steer the beam without moving the transducer itself. The lens can shape or focus the beam, but it isn’t what causes the sweeping in a mechanical system. Multi-element delay control, used in phased arrays, also steers beams electronically rather than by moving a single element.

In a mechanical transducer, the beam is swept by physically moving the crystal assembly. A motor drives the element (and its lens) to tilt or rotate, so the emitted beam changes direction across a range of angles. As this single element sweeps, it creates the fan-shaped, sector image you see on the screen. This is different from electronic steering, which uses delays across multiple elements to steer the beam without moving the transducer itself. The lens can shape or focus the beam, but it isn’t what causes the sweeping in a mechanical system. Multi-element delay control, used in phased arrays, also steers beams electronically rather than by moving a single element.