You notice a loss of detail in the lateral dimension of the ultrasound image. What can you do to improve this?

• A. Decrease the number of focal zones
• B. Increase the scan line density
• C. Decrease the transducer frequency
• D. Increase the frame averaging

Answer: (B)

Improving lateral resolution relies on how densely the image is sampled across its width. Lateral resolution is better when more scan lines—more sampling across the lateral dimension—are used, because each line contributes information about structures side by side. Increasing scan line density adds samples across the image, reduces gaps, and lets you distinguish two closely spaced objects laterally with greater clarity.

Lowering the number of focal zones isn’t the right move for sharpening lateral detail across the whole image, since focusing affects resolution at specific depths and can reduce frame rate. Decreasing the transducer frequency worsens both resolution and penetration, so it wouldn’t help. Frame averaging can smooth speckle and improve perceived image clarity but doesn’t truly increase the lateral resolution.

So, increasing scan line density directly enhances the detail you can resolve in the lateral dimension.