With an annular phased array, the final image is a composite of information from only the _______ of each ______.

With an annular phased array, the final image is a composite of information from only the _______ of each ______.

• A. Focal zone; Crystal
• B. Focal zone; Element
• C. Focal area; Crystal
• D. Focal field; Crystal

Answer: (A)

In an annular phased array, each concentric ring (crystal) can be focused at a specific depth by applying the right delays across the rings. The region where that ring’s beam optimally converges is its focal zone, where the transmitted energy and received echoes are most informative. The final image is built by combining the information gathered from the focal zones of all the rings, effectively stitching together data from each crystal’s best-depth region to form the complete picture. That’s why the correct pairing is the focal zone from each crystal.

In an annular phased array, each concentric ring (crystal) can be focused at a specific depth by applying the right delays across the rings. The region where that ring’s beam optimally converges is its focal zone, where the transmitted energy and received echoes are most informative. The final image is built by combining the information gathered from the focal zones of all the rings, effectively stitching together data from each crystal’s best-depth region to form the complete picture. That’s why the correct pairing is the focal zone from each crystal.