Jeong Joo Seo , Jong Won Park

The KIPS Transactions:PartB , Vol. 19, No. 2, pp. 123-126, Apr. 2012
10.3745/KIPSTB.2012.19.2.123,   PDF Download:

Abstract

This paper proposed a method to separate a liver into left and right liver lobes for simple and exact volumetry of the river graft at abdominal MDCT (Multi-Detector Computed Tomography) image before the living donor liver transplantation. A medical team can evaluate an accurate river graft with minimized interaction between the team and a system using this algorithm for ensuring donor`s and recipient``s safe. On the image of segmented liver, 2 points (PMHV: a point in Middle Hepatic Vein and PPV: a point at the beginning of right branch of Portal Vein) are selected to separate a liver into left and right liver lobes. Middle hepatic vein is automatically segmented using PMHV, and the cutting line is decided on the basis of segmented Middle Hepatic Vein. A liver is separated on connecting the cutting line and PPV. The volume and ratio of the river graft are estimated. The volume estimated using 2 points are compared with a manual volume that diagnostic radiologist processed and estimated and the weight measured during surgery to support proof of exact volume. The mean ± standard deviation of the differences between the actual weights and the estimated volumes was 162.38cm3±124.39 in the case of manual segmentation and 107.69cm3±97.24 in the case of 2 points method. The correlation coefficient between the actual weight and the manually estimated volume is 0.79, and the correlation coefficient between the actual weight and the volume estimated using 2 points is 0.87. After selection the 2 points, the time involved in separation a liver into left and right river lobe and volumetry of them is measured for confirmation that the algorithm can be used on real time during surgery. The mean ± standard deviation of the process time is 57.28sec±32.81 per 1 data set (149.17pages±55.92).

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