When you increase the scan line density in the B-mode image, you improve:

When you increase the scan line density in the B-mode image, you improve:

• A. Temporal resolution
• B. Contrast resolution
• C. Slice thickness
• D. Lateral resolution

Answer: (D)

Increasing scan line density means more ultrasound lines are sampled across the width of the image, giving finer lateral sampling. This reduced spacing between lines lets two structures that are close together side-to-side be distinguished more clearly, so lateral resolution improves in a B-mode image. Keep in mind that this change doesn't alter slice thickness, which is determined by the beam geometry and elevation focus, and it doesn't enhance contrast resolution, which depends on gray-scale separation and dynamic range. It can, however, reduce temporal resolution (frame rate) because more data per frame takes longer to acquire. So the most direct improvement from higher line density is better lateral resolution.

Increasing scan line density means more ultrasound lines are sampled across the width of the image, giving finer lateral sampling. This reduced spacing between lines lets two structures that are close together side-to-side be distinguished more clearly, so lateral resolution improves in a B-mode image.

Keep in mind that this change doesn't alter slice thickness, which is determined by the beam geometry and elevation focus, and it doesn't enhance contrast resolution, which depends on gray-scale separation and dynamic range. It can, however, reduce temporal resolution (frame rate) because more data per frame takes longer to acquire. So the most direct improvement from higher line density is better lateral resolution.