Can Accurate Flow Velocity or Volume Be Measured?

LSFG is not yet able to display absolute flow velocity, such as "this vessel has a flow rate of X millimeters per second."
It is known that the indicated values change depending on several factors including vessel diameter and vessel wall thickness, and this remains an ongoing research topic.
If absolute flow velocity can be determined, retinal vascular blood flow volume can be calculated by measuring vessel diameter.
However, for tissue blood flow, this would still be quite difficult.
Nevertheless, two-dimensional blood flow maps contain a great deal of information, and comparisons between different sites as well as tracking of temporal changes can be easily performed.
Even without knowing absolute velocity, it appears to be sufficiently useful for diagnosis, such as confirming improvement in blood flow before and after treatment.
Compared to other methods, it is far more user-friendly, and its reproducibility and reliability are more than adequate.