Which transducer array is described as a straight line of rectangular elements about one wavelength wide, with pulses traveling in straight parallel lines to produce a rectangular image?

Which transducer array is described as a straight line of rectangular elements about one wavelength wide, with pulses traveling in straight parallel lines to produce a rectangular image?

• A. Linear Sequenced Array
• B. Convex Sequential Array
• C. Linear Phased Array
• D. CW Transducers

Answer: (A)

Transducer geometry and firing strategy determine the scan pattern and the resulting image shape. A straight line of rectangular elements about one wavelength wide that fires in sequence creates individual scan lines that run parallel to each other. Since there’s no deliberate steering or complex phase delays to tilt the beam, the beams travel in straight, parallel paths, producing a rectangular B-mode image footprint. This is different from a linear phased array, where small timing delays are used to steer and focus the beam, which yields angled or fan-shaped scan lines and a different field geometry. A convex sequential array uses a curved aperture, leading to a curved field rather than strictly straight parallel lines. Continuous-wave transducers don’t provide depth information needed for a rectangular image, so they aren’t applicable here.

Transducer geometry and firing strategy determine the scan pattern and the resulting image shape. A straight line of rectangular elements about one wavelength wide that fires in sequence creates individual scan lines that run parallel to each other. Since there’s no deliberate steering or complex phase delays to tilt the beam, the beams travel in straight, parallel paths, producing a rectangular B-mode image footprint.

This is different from a linear phased array, where small timing delays are used to steer and focus the beam, which yields angled or fan-shaped scan lines and a different field geometry. A convex sequential array uses a curved aperture, leading to a curved field rather than strictly straight parallel lines. Continuous-wave transducers don’t provide depth information needed for a rectangular image, so they aren’t applicable here.