Which term is not among the listed alternate names for axial resolution?

Which term is not among the listed alternate names for axial resolution?

• A. Lateral resolution
• B. Longitudinal
• C. Range
• D. Radial

Answer: (A)

Axial resolution is all about distinguishing structures that lie along the path of the ultrasound beam. This is why it’s also called longitudinal resolution, depth resolution, or range resolution—the terms all refer to separation along the beam direction. Lateral resolution, in contrast, describes how well you can distinguish structures that are side-by-side across the width of the beam, which depends on the beam’s width and focusing, not the pulse length. Because lateral resolution refers to a different orientation, it isn’t a standard alternate name for axial resolution. (Radial isn’t a common axial synonym in standard texts, but the key distinction remains: axial = along the beam, lateral = across the beam.)

Axial resolution is all about distinguishing structures that lie along the path of the ultrasound beam. This is why it’s also called longitudinal resolution, depth resolution, or range resolution—the terms all refer to separation along the beam direction. Lateral resolution, in contrast, describes how well you can distinguish structures that are side-by-side across the width of the beam, which depends on the beam’s width and focusing, not the pulse length. Because lateral resolution refers to a different orientation, it isn’t a standard alternate name for axial resolution. (Radial isn’t a common axial synonym in standard texts, but the key distinction remains: axial = along the beam, lateral = across the beam.)