Which resolution is related to the dimension perpendicular to the imaging plane, often described as slice thickness?

Which resolution is related to the dimension perpendicular to the imaging plane, often described as slice thickness?

• A. Elevation
• B. Axial
• C. Lateral
• D. Temporal

Answer: (A)

Elevation resolution describes the dimension perpendicular to the imaging plane, the thickness of the slice. This is why it’s the best answer: slice thickness is the practical measure of how thick the imaging slice is in the elevation direction, so it directly determines how well two structures separated along that axis can be distinguished. A thinner slice improves separation in the elevation direction, while a thicker slice blurs structures that lie one above the other. In ultrasound, the other dimensions are in-plane within the imaging plane: axial resolution is along the beam’s depth, determined by the spatial pulse length; lateral resolution is across the image within the plane, affected by beam width and focusing. Temporal resolution relates to how quickly frames are acquired. None of these describe the dimension perpendicular to the imaging plane.

Elevation resolution describes the dimension perpendicular to the imaging plane, the thickness of the slice. This is why it’s the best answer: slice thickness is the practical measure of how thick the imaging slice is in the elevation direction, so it directly determines how well two structures separated along that axis can be distinguished. A thinner slice improves separation in the elevation direction, while a thicker slice blurs structures that lie one above the other.

In ultrasound, the other dimensions are in-plane within the imaging plane: axial resolution is along the beam’s depth, determined by the spatial pulse length; lateral resolution is across the image within the plane, affected by beam width and focusing. Temporal resolution relates to how quickly frames are acquired. None of these describe the dimension perpendicular to the imaging plane.