In a word, it is the acceleration of blood flow. It quantifies the degree of the momentum of blood flow. A higher FAI indicates stronger momentum.
FAI (Flow Acceleration Index) calculates the maximum change in increasing MBR and indexes the instantaneous force that increases blood flow in a short period. Since it represents the maximum change during the relatively rapid expansion of blood vessels reaching the peak due to arterial pulsation, it is also a parameter that reflects the strength of blood flow ejected from the heart, which is the supply source.
It represents the maximum value of the change per frame (1/30 sec).
Recent reports
- Chie Iwase, Takeshi Iwase, Ryo Tomita, Tomohiko Akahori, Eimei Ra, Kentaro Yamamoto and Hiroko Terasaki
Changes in pulse waveforms in response to intraocular pressure elevation determined by laser speckle flowgraphy in healthy subjects
BMC Ophthalmology, 21(1), 1-13, doi:10.1186/s12886-021-02070-7, 2021. - Yamamoto Nobuhiko, Nakano Makoto, Nochioka Kotaro, Yasuda Masayuki, Kunikata Hiroshi, Nakazawa Toru, Yasuda Satoshi
Ocular blood flow dynamics following sinus rhythm restoration through catheter ablation: laser speckle flowgraphy in patients with persistent atrial fibrillation
European Heart Journal - Imaging Methods and Practice, 2(3), Jul 2024. doi:10.1093/ehjimp/qyae071 [Link]