Which resolution describes distinguishing two structures side by side perpendicular to the beam?

Which resolution describes distinguishing two structures side by side perpendicular to the beam?

• A. Lateral resolution
• B. Axial resolution
• C. Elevational resolution
• D. Penetration

Answer: (A)

Lateral resolution describes distinguishing two structures that lie side by side in a direction perpendicular to the ultrasound beam. The ability to separate them depends on the beam’s width at that depth—the narrower the beam, the better the lateral resolution, allowing two closely spaced objects to appear as separate echoes. In contrast, axial resolution concerns separation along the beam’s path (depth) and is mainly set by pulse length and bandwidth; elevational (slice-thickness) resolution is about the third dimension, the thickness of the imaging plane; and penetration refers to how deep the signal can image before it attenuates. So this question targets how well we can resolve side-by-side structures relative to the beam, which is exactly what lateral resolution measures.

Lateral resolution describes distinguishing two structures that lie side by side in a direction perpendicular to the ultrasound beam. The ability to separate them depends on the beam’s width at that depth—the narrower the beam, the better the lateral resolution, allowing two closely spaced objects to appear as separate echoes. In contrast, axial resolution concerns separation along the beam’s path (depth) and is mainly set by pulse length and bandwidth; elevational (slice-thickness) resolution is about the third dimension, the thickness of the imaging plane; and penetration refers to how deep the signal can image before it attenuates. So this question targets how well we can resolve side-by-side structures relative to the beam, which is exactly what lateral resolution measures.