Table 1 ULM qualitative and quantitative parameters

Qualitative parameters

microvasculature morphology

(dot-like, line-like or branch-like patterns)

microvasculature distribution

(central or peripheral)

microvasculature flow direction

(toward the transducer or away from the transducer)

Quantitative parameters

microvasculature density

microvasculature tortuosity

(max tortuosity and mean tortuosity)

microvasculature diameter

(max diameter and mean diameter)

microvasculature flow velocity

(max flow velocity and mean flow velocity)