In:
Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3369-3369
Abstract:
Vector flow mapping (VFM) is an echocardiographic approach for visualizing two-dimensional cardiac flow dynamics by estimating the radial component of flow from the Doppler velocities and wall motion velocities using mass-conservation equations. Although VFM provides two-dimensional flow in a clinically suitable, fast, and easy manner, it is only applicable to bounded regions such as ventricles. In this study, the VFM algorithm is modified so that the velocities are estimated regardless of the flow geometry. The proposed method, vascular VFM, operates on the same principle as VFM but with additional boundary conditions created by using Doppler velocities measured at a different steering angle. The method was optimized and validated using a common carotid artery phantom and particle-image-velocimetry (PIV). The results indicated that the optimal angle of an additional Doppler beam ranged from 10 to 20 degrees. Under this optimal-beam-angle condition, the standard deviation (SD) of total vascular VFM error, normalized by maximum velocity, is reasonably small (8.1 to 16.3%). The error is predominantly from input Doppler velocities, which has error of up to 12.7%. When calculated with ideal inputs, the algorithm error ranges from 1.9 to 4.3%. These results indicate that vascular VFM algorithm estimates two-dimensional flow accurately in the non-bound region and may be clinically significant in cases such as arteriosclerosis diagnosis.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2016
detail.hit.zdb_id:
1461063-2
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