When measuring the width of a point target in a tissue-mimicking phantom, you are evaluating which property?

When measuring the width of a point target in a tissue-mimicking phantom, you are evaluating which property?

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

Answer: (A)

Lateral resolution is being evaluated. The width you see for a point target in the image is governed by how narrowly the ultrasound beam can focus in the horizontal (side-to-side) direction. A finer, narrower beam yields a smaller apparent width and thus better lateral resolution. Axial resolution concerns separation along the beam path (depth), elevational resolution deals with the thickness of the imaging plane (out-of-plane), and contrast resolution is about distinguishing echoes with similar intensities. So the measured width of the point target directly reflects the system’s lateral resolution.

Lateral resolution is being evaluated. The width you see for a point target in the image is governed by how narrowly the ultrasound beam can focus in the horizontal (side-to-side) direction. A finer, narrower beam yields a smaller apparent width and thus better lateral resolution. Axial resolution concerns separation along the beam path (depth), elevational resolution deals with the thickness of the imaging plane (out-of-plane), and contrast resolution is about distinguishing echoes with similar intensities. So the measured width of the point target directly reflects the system’s lateral resolution.