If you are using a transducer with poor elevation resolution, which problem are you most likely to encounter?

• A. Inability to resolve two structures that lie close together and parallel to the path of the beam
• B. Inability to resolve two structures that lie close together, perpendicular to the path of the beam, and parallel to the long axis of the transducer
• C. Inability to penetrate through dense tissue
• D. Inability to clearly demonstrate small cystic structures

Answer: (D)

Elevation resolution is about distinguishing structures in the elevational direction—the thickness of the beam perpendicular to the image plane. When this resolution is poor, the beam’s slice is thick, so two reflectors that are close together in that direction can’t be separated and end up appearing as one structure.

So you’re most likely to encounter an inability to resolve two structures that lie very close in the elevational (perpendicular to the beam, along the transducer’s length) direction. This manifests as a merged or blurred image of nearby objects. Small cystic structures can be especially hard to delineate because their details rely on clear boundaries that may be smeared by poor slice thickness.