Flow to Stasis Aggregation Ratio (FSAR)

To get an indication whether there is any additional (secondary) aggregation at low flow, the ratio of the back scatter intensity at an optional low shear rate, e.g. 10 s-¹ (Isc₁₀) and Isc at stasis (Isc₀) can be calculated. In case of additional flow-induced aggregation (lower Isc), a Flow-to-Stasis Aggregation Ratio (FSAR) value of <1 can be expected.

(Equation 5)

Usually, however, FSAR values are > 1, meaning that there is rather breakdown of aggregates due to flow than hyper aggregate formation.