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Tracking Contrast in Echocardiography by a Combined Snake and Optical Flow Technique

Karin Althoff (Institutionen för signaler och system, Digitala bildsystem och bildanalys) ; Ghassan Hamarneh (Institutionen för signaler och system, Digitala bildsystem och bildanalys) ; Marie Beckman Suurküla ; Tomas Gustavsson (Institutionen för signaler och system, Digitala bildsystem och bildanalys)
IEEE Conf. on Computers in Cardiology Vol. 27 (2000),
[Konferensbidrag, refereegranskat]

Contrast-echocardiography in conjunction with real-time video-densiometry can be an effective means of studying right ventricular (RV) structural changes, e.g. in patients diagnosed with Arrhythmogenic Right Ventricular Dysplasia (ARVD). In order to characterize RV flow pattern it may be necessary to track the front of the contrast agent as it enters the RV. Active contour models (ACM) is a standard image analysis method,which can be applied to time-dynamic tracking problem.To improve tracking speed we extended the formulationof ACM by including an additional force, derived fromthe optical flow field, another standard image analysisalgorithm. This reduced the number of iterations needed to find the front of the contrast agent significantly. Also the changes in intensity of the contrast agent over time were studied. Two groups were compared, one with30 patients diagnosed with ARVD and one with 18healthy volunteers. Our study shows that that using our suggested method (calculating wash-in and wash-out time indices) it is possible to discriminate between thetwo groups.



Denna post skapades 2006-09-12. Senast ändrad 2013-05-30.
CPL Pubid: 14885

 

Institutioner (Chalmers)

Institutionen för signaler och system, Digitala bildsystem och bildanalys (1900-2013)

Ämnesområden

Information Technology

Chalmers infrastruktur