The convex array typically uses how many rectangular strips?

• A. 60-100
• B. 120-250
• C. 260-300
• D. 400-500

Answer: (B)

In a convex array, the image is formed by many small rectangular elements lined up along a curved surface. The number of these active elements, or rectangular strips, determines how finely the beam can be steered and focused, which in turn affects image resolution and quality. In practice, convex probes typically use a few dozen to a few hundred elements, with common designs around 128–192 elements (and sometimes 256). This places the typical count squarely in the range of about 120–250 elements, making that option the best match. If there were far fewer elements, lateral resolution and steering precision would suffer; if there were many more, the probe would become more complex and costly without a proportional clinical gain in everyday use.