What does the term "spatial resolution" refer to in sonography?

Spatial resolution in sonography specifically refers to the ability to distinguish small structures as separate entities. This is crucial in ultrasound imaging because it determines how well the system can differentiate between adjacent structures, which is essential for accurate diagnosis and assessment. High spatial resolution allows for better visualization of fine details, meaning that two closely positioned anatomical structures can be identified as distinct entities on the ultrasound image.

For example, in vascular imaging, being able to resolve small vessels or differentiate between a vessel and an adjacent nerve is vital for clinical decision-making. Thus, spatial resolution impacts the quality and diagnostic utility of the ultrasound images.

The other concepts mentioned, such as differentiating between different tissues or the sharpness of the image, are elements associated with other types of resolution or image quality but do not precisely capture the definition of spatial resolution in the context provided.