Which artifact is mitigated by subdicing in array transducers?

Which artifact is mitigated by subdicing in array transducers?

• A. Grating lobes
• B. Side lobes
• C. Ringing
• D. Shadowing

Answer: (A)

Subdicing reduces grating lobes by splitting each transducer element into smaller subelements. This breaks up the uniform spacing that creates additional beam replicas at off-axis angles when the array is steered or used at higher frequencies. With the effective spacing made smaller, the energy that would form grating lobes is greatly diminished, leading to a cleaner beam with fewer artifacts at wide angles. Side lobes are more closely tied to how the aperture is illuminated and any apodization used, so subdicing isn’t the primary tool for them. Ringing comes from the transducer’s impulse response and the drive electronics, not the microstructure of the elements. Shadowing is caused by tissue attenuation or blocking objects, not by the subelement arrangement.

Subdicing reduces grating lobes by splitting each transducer element into smaller subelements. This breaks up the uniform spacing that creates additional beam replicas at off-axis angles when the array is steered or used at higher frequencies. With the effective spacing made smaller, the energy that would form grating lobes is greatly diminished, leading to a cleaner beam with fewer artifacts at wide angles.

Side lobes are more closely tied to how the aperture is illuminated and any apodization used, so subdicing isn’t the primary tool for them. Ringing comes from the transducer’s impulse response and the drive electronics, not the microstructure of the elements. Shadowing is caused by tissue attenuation or blocking objects, not by the subelement arrangement.