Which components are included in spatial resolution?

Which components are included in spatial resolution?

• A. Axial, elevational, and lateral
• B. Temporal, spectral, and phase
• C. Depth, width, and depth
• D. Contrast, brightness, and noise

Answer: (A)

Spatial resolution is about how well two closely spaced structures can be distinguished in the image, in all spatial directions. In ultrasound, this breaks down into three directions: axial, which runs along the direction of the sound beam; lateral, which is across the beam within the image plane; and elevational, which is the slice thickness perpendicular to the image plane. Axial resolution improves with shorter pulse length and higher frequency, helping separate objects along the beam. Lateral and elevational resolution depend on beam width and focusing—tushing the beam into a thinner, more focused profile enhances separation across and through the slice. So, the components that define spatial resolution are axial, elevational, and lateral. The other options point to aspects not defining spatial resolution: temporal, spectral, and phase relate to timing and frequency characteristics rather than spatial separation; depth, width, and depth is not a standard set for resolution and repeats depth; contrast, brightness, and noise describe image quality factors, not the ability to resolve two points in space.

Spatial resolution is about how well two closely spaced structures can be distinguished in the image, in all spatial directions. In ultrasound, this breaks down into three directions: axial, which runs along the direction of the sound beam; lateral, which is across the beam within the image plane; and elevational, which is the slice thickness perpendicular to the image plane. Axial resolution improves with shorter pulse length and higher frequency, helping separate objects along the beam. Lateral and elevational resolution depend on beam width and focusing—tushing the beam into a thinner, more focused profile enhances separation across and through the slice. So, the components that define spatial resolution are axial, elevational, and lateral.

The other options point to aspects not defining spatial resolution: temporal, spectral, and phase relate to timing and frequency characteristics rather than spatial separation; depth, width, and depth is not a standard set for resolution and repeats depth; contrast, brightness, and noise describe image quality factors, not the ability to resolve two points in space.