TY - JOUR
T1 - Ultrasound low-velocity flow estimations using cross-correlation and decorrelation
T2 - A thread phantom study
AU - Pan, Ton Tai
AU - Chiang, Huihua Kenny
N1 - Funding Information:
The authors would like to thank the National Science Council for supporting this research under grant NSC 90-2213-E-010-020.
PY - 2007/6
Y1 - 2007/6
N2 - In this paper, two time-domain flow velocity measurement methods, cross-correlation and decorrelation, were implemented and compared in measuring low blood-flow velocities, ranging from 0.05 to 5 cm/s, at known beam-vessel angles of 50-90° in a thread phantom. Both methods achieved a significant correlation between the measured and the known velocities (r = 0.99; P < 0.001) in the thread phantom measurements, at 50-70° beam-vessel angles. Although the cross-correlation method showed a significant correlation (r > 0.99; P < 0.001), this method caused large errors (>45%) at 80° and 90°, whereas the decorrelation method not only achieved a significant correlation (r > 0.99; P < 0.001) but also resulted in smaller errors (<19%) at 80° and 90°. This study demonstrates the potential of time-domain decorrelation method for measuring low flow velocity at large beam-vessel angles near perpendicular conditions.
AB - In this paper, two time-domain flow velocity measurement methods, cross-correlation and decorrelation, were implemented and compared in measuring low blood-flow velocities, ranging from 0.05 to 5 cm/s, at known beam-vessel angles of 50-90° in a thread phantom. Both methods achieved a significant correlation between the measured and the known velocities (r = 0.99; P < 0.001) in the thread phantom measurements, at 50-70° beam-vessel angles. Although the cross-correlation method showed a significant correlation (r > 0.99; P < 0.001), this method caused large errors (>45%) at 80° and 90°, whereas the decorrelation method not only achieved a significant correlation (r > 0.99; P < 0.001) but also resulted in smaller errors (<19%) at 80° and 90°. This study demonstrates the potential of time-domain decorrelation method for measuring low flow velocity at large beam-vessel angles near perpendicular conditions.
KW - Beam-vessel angle
KW - Cross-correlation
KW - Decorrelation
KW - Low flow velocity
KW - Time-domain
UR - http://www.scopus.com/inward/record.url?scp=33847379270&partnerID=8YFLogxK
U2 - 10.1016/j.medengphy.2006.06.006
DO - 10.1016/j.medengphy.2006.06.006
M3 - Article
C2 - 16931098
AN - SCOPUS:33847379270
SN - 1350-4533
VL - 29
SP - 602
EP - 614
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
IS - 5
ER -