You notice a loss in 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 rate averaging

Answer: (B)

Improving lateral detail comes from better sampling across the width of the image. Increasing scan line density adds more lines per unit distance, so the display samples side-by-side structures more finely. This higher lateral sampling makes nearby echoes appear as separate features instead of merging together, sharpening the image laterally.

The other options either change the physics of the beam or introduce smoothing:

• Reducing the number of focal zones narrows the beam only at specific depths and can actually degrade lateral resolution elsewhere and reduce frame rate.

• Lowering the transducer frequency widens the beam and lowers resolution and penetration.

• Averaging frames improves noise suppression but tends to blur fine spatial detail.