Fig. 2.

(a) and (b) demonstrate adaptive selection of time intervals for Doppler analysis: (a) Time intervals used to calculate Doppler phase shift for the same A-scan (m^th A-scan) are different for pixels at different depth (1^st pixel and k^th pixel); (b) Time intervals used to calculate Doppler phase shift for the same pixel in different A-scans are different (1st pixel in the m^th A-scan and in the q^th A-scan and k^th pixel in the m^th A-scan and in the q^th A-scan); (c) time interval remains the same for conventional Doppler analysis.