Doppler flow measurement using surface integration of velocity vectors (SIVV): in vitro validation.
2000 (English)In: Ultrasound in Medicine and Biology, ISSN 0301-5629, Vol. 26, no 2, 255-262 p.Article in journal (Refereed) Published
Blood flow measurement using an improved surface integration of velocity vectors (SIVV) technique was tested in in vitro phantoms. SIVV was compared with true flow (12-116 mL/s) in a steady-state model using two angles of insonation (45 degrees and 60 degrees ) and two vessel sizes (internal diameter = 11 and 19 mm). Repeatability of the method was tested at various flow rates for each angle of insonation and vessel. In a univentricular pulsatile model, SIVV flow measured at the mitral inlet was compared to true flow (29-61 mL/s). Correlation was excellent for the 19-mm vessel (r(2)= 0.99). There was a systematic bias but close limits of agreement (mean +/- 2 SD = -24.1% +/- 7.6% at 45 degrees; +16.4% +/- 11.0% at 60 degrees ). Using the 11-mm vessel, a quadratic relationship was demonstrated between between SIVV and true flow (r(2) = 0.98-0.99), regardless of the angle of insonation. In the pulsatile system, good agreement and correlation were shown (r(2) = 0.94, mean +/- 2 SD = -4.7 +/- 10.1%). The coefficients of variation for repeated SIVV measurements ranged from 0.9% to 10.3%. This method demonstrates precision and repeatability, and is potentially useful for clinical measurements.
Place, publisher, year, edition, pages
2000. Vol. 26, no 2, 255-262 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:liu:diva-116908PubMedID: 10722915OAI: oai:DiVA.org:liu-116908DiVA: diva2:801459