Key result
Image-directed Doppler measurement overestimated real flow velocity by 86% in a venous model and 24% in an arterial model, requiring a correction factor of 1.47 for accurate in vivo assessment.
Why the study?
Does image-directed Doppler accurately measure superior mesenteric artery blood flow compared to real flow in artificial models?
Does image-directed Doppler accurately measure superior mesenteric artery blood flow compared to real flow in artificial models?
Image-directed Doppler overestimates superior mesenteric artery blood flow velocity, requiring a correction factor for accurate in vivo measurement.
May bias uncorrected Doppler estimates of mesenteric flow; leaves open human validation before clinical adoption.
Image-directed Doppler measurement of superior mesenteric artery blood flow in volunteers was validated in two artificial models with either a venous or an arterial flow profile. In the "venous" model, the Doppler device overestimated the real flow velocity by 86 +/- 7%, and in the "arterial" model by 24 +/- 9%. The areas under the time-frequency curves (AUCs) from the arterial model were measured by planimetry. A correction factor of 1.47 between flow velocities calculated after planimetry and real flow was established. Correction for this factor resulted in a flow velocity of 19.5 +/- 4.7 cm/s and a blood flow rate of 377 +/- 166 ml/min in the volunteers.
No takes yet. Share an insight, caveat, or question.
Scheurlen et al. (1992) studied this question. Image-directed Doppler measurement vs. Real flow (artificial models) was evaluated on Flow velocity accuracy. Image-directed Doppler measurement overestimated real flow velocity by 86% in a venous model and 24% in an arterial model, requiring a correction factor of 1.47 for accurate in vivo assessment.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: