Generally, modern transducers called arrays contain _____ active elements.

Generally, modern transducers called arrays contain _____ active elements.

• A. Multiple
• B. Single
• C. Several
• D. Many

Answer: (A)

Arrays use more than one active element so they can shape and steer the ultrasound beam. Each element can be excited with precise timing and amplitude, creating constructive interference in a desired direction and reducing energy in others. This ability to control the beam would be impossible with a single element, which is why an array is characterized by having multiple active elements. “Multiple” is the best label here because it conveys the general, non-specific sense of more than one—exact counts like several or many aren’t necessary for the concept.

Arrays use more than one active element so they can shape and steer the ultrasound beam. Each element can be excited with precise timing and amplitude, creating constructive interference in a desired direction and reducing energy in others. This ability to control the beam would be impossible with a single element, which is why an array is characterized by having multiple active elements. “Multiple” is the best label here because it conveys the general, non-specific sense of more than one—exact counts like several or many aren’t necessary for the concept.