A convex array has how many rectangular strips arranged side by side in a bowed line?

• A. 60-100 Rectangular
• B. 120-250 Rectangular
• C. 300-350 Rectangular
• D. 400-500 Rectangular

Answer: (B)

In a convex (curved) ultrasonic array, the aperture is made up of many small rectangular transducer elements arranged side by side along a bowed arc to create a sector-shaped beam. Having a substantial number of elements is important because it provides enough granularity for beam forming, steering, and focusing across the field of view. Typical convex arrays use on the order of a couple hundred elements—roughly 120 to 250 rectangular strips—so that you can achieve good lateral resolution and a wide steering capability without making the system impractically complex. If there were far fewer elements, the beam would be coarse and steering limited; while far more elements would add cost and complexity without necessarily yielding proportional imaging benefits. This range naturally covers common designs like 128, 192, or 256 elements, which explains why the answer sits around 120–250.