Which configuration is commonly used for curved, broad-depth abdominal imaging?

• A. Mechanical sector
• B. Linear array
• C. Phased array
• D. Convex array

Answer: (D)

Transducer shape determines how wide and how curved the ultrasound beam is as you scan. For imaging a curved, broad area like the abdomen, you want a footprint that follows the body's surface and provides a wide field of view. The convex (curved) array does exactly that: its elements are arranged along a curved surface, producing a wide sector image that covers a large, curved area. The larger, curved aperture helps reach deeper structures while maintaining acceptable resolution across the field, which is ideal for broad-depth abdominal imaging.

The other options don’t fit as well. A linear array has a flat footprint and excels at superficial or focused imaging with high near-field resolution, but its field of view is narrower for a curved, wide-area surface. A phased array has a small footprint and is great for rapid steering in focused areas (like the heart), not for broad abdominal coverage. A mechanical sector can provide a wide image, but it’s older technology with limited flexibility and practicality for routine abdominal scanning.