NDLI: Evaluation of vortex flow in left ventricle by echo-dynamography and phase contrast magnetic resonance angiography

Content Provider	IEEE Xplore Digital Library
Author	Kojima, T. Kameyama, T. Nakajima, H. Khmyrova, E. Kurokawa, T. Saijo, Y.
Copyright Year	2012
Description	Author affiliation: Grad. Sch. of Med. Sci., Tohoku Univ., Sendai, Japan (Kameyama, T.; Kurokawa, T.) \|\| Grad. Sch. of Biomed. Eng., Tohoku Univ., Sendai, Japan (Kojima, T.; Nakajima, H.; Khmyrova, E.; Saijo, Y.)
Abstract	Echo-dynamography (EDG) is a method for visualizing left ventricular (LV) blood flow based on cardiac Doppler measurement in which blood flow component perpendicular to the ultrasonic beam is deduced by applying fluid dynamics theories to two-dimensional (2D) distribution of blood flow component along the ultrasonic beam. EDG has been validated by numerical simulation and particle image velocimetry of model circulation. However, these validations were too simple to reproduce unstable and asymmetrical flow in a beating heart. In the present study, EDG is compared with three-directional (3D) blood flow distribution on the same plane obtained with phase contrast magnetic resonance angiography (PCMRA) for clinical validation. Moreover, the location and vorticity of the vortex flow in LV are measured quantitatively and the relation to echocardiographic parameters of systolic and diastolic functions is discussed. 3D components of blood flow on a plane were obtained with triple scans of the same plane with ECG trigger and breath holding; 1) phase encode (x-axis), 2) read out (y-axis) and 3) slice selection (z-axis). After the acquisition of MRA dataset, color Doppler dataset of the same plane was acquired and 2D velocity distribution was obtained with EDG in MATLAB programs. EDG and PCMRA showed similar velocity vector distribution and formation of LV vortex flow. The vortex at mid diastolic phase was strongly affected by early diastolic filling while the vortex at isometric contraction was affected by atrial filling. EDG gained a new insight on systolic-diastolic coupling from the view point of LV blood flow such as LV vortex formation.
Sponsorship	IEEE Eng. Medicine Biol. Soc.
Starting Page	2676
Ending Page	2679
File Size	2229210
Page Count	4
File Format	PDF
ISBN	9781424441198
ISSN	1557170X
e-ISBN	9781457717871
DOI	10.1109/EMBC.2012.6346515
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Blood flow Heart Filling Myocardium Doppler effect Acoustics Particle beam measurements
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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