Int J Comput Assist Radiol Surg - Left ventricular myocardium segmentation on delayed phase of multi-detector row computed tomography.

Tópicos

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Resumo

TIONALE AND OBJECTIVES: Advanced ischemic heart disease is usually accompanied by left ventricular (LV) myocardial volume loss and an abnormal enhancing pattern on delayed phase of multi-detector row computed tomography (MDCT). To assist radiologists and physicians in estimating the LV myocardial volume on delayed phase, this paper proposes an adaptive segmentation method for contouring the myocardial region in the delayed-phase MDCT and for computing the volume.MATERIALS AND METHODS: The proposed method uses an anisotropic diffusion filter as a preprocessing procedure to enhance contrast and reduce specks in MDCT imaging. This work picks the middle of mid-ventricular level image slices as the lead slice. The proposed method develops two contouring modes to sketch the myocardium contour on the lead slice. By establishing the obtained contours as the initial contours, the region-growing method is employed to identify the contour of the myocardial region for each slice. The convex-hull finding algorithm is then used to refine the extracted contour. Finally, the width properties of the myocardial region and the morphological operators are used to obtain the entire LV myocardial volume.RESULTS: Twenty-seven healthy patients who had no symptoms of ischemic heart disease are examined to evaluate the performance of the proposed method. Compared with manual contours delineated by two experienced experts, the contouring results using computer simulation reveal that the proposed method reliably identifies contours similar to those obtained using manual sketching.CONCLUSION: The proposed method provides robust contouring for the LV myocardium on delayed-phase MDCT. The potential role of this technique may substantially reduce the time required to sketch manually a precise contour with high stability.

Resumo Limpo

tional object advanc ischem heart diseas usual accompani left ventricular lv myocardi volum loss abnorm enhanc pattern delay phase multidetector row comput tomographi mdct assist radiologist physician estim lv myocardi volum delay phase paper propos adapt segment method contour myocardi region delayedphas mdct comput volumemateri method propos method use anisotrop diffus filter preprocess procedur enhanc contrast reduc speck mdct imag work pick middl midventricular level imag slice lead slice propos method develop two contour mode sketch myocardium contour lead slice establish obtain contour initi contour regiongrow method employ identifi contour myocardi region slice convexhul find algorithm use refin extract contour final width properti myocardi region morpholog oper use obtain entir lv myocardi volumeresult twentyseven healthi patient symptom ischem heart diseas examin evalu perform propos method compar manual contour delin two experienc expert contour result use comput simul reveal propos method reliabl identifi contour similar obtain use manual sketchingconclus propos method provid robust contour lv myocardium delayedphas mdct potenti role techniqu may substanti reduc time requir sketch manual precis contour high stabil

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