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Computed tomography liver volumetry using 3-dimensional image data in living donor liver transplantation: Effects of the slice thickness on the volume calculation†
Article first published online: 29 NOV 2011
Copyright © 2011 American Association for the Study of Liver Diseases
Volume 17, Issue 12, pages 1427–1436, December 2011
How to Cite
Hori, M., Suzuki, K., Epstein, M. L. and Baron, R. L. (2011), Computed tomography liver volumetry using 3-dimensional image data in living donor liver transplantation: Effects of the slice thickness on the volume calculation. Liver Transpl, 17: 1427–1436. doi: 10.1002/lt.22419
This study was partially supported by the National Institutes of Health (grants S10 RR021039 and P30 CA14599).
- Issue published online: 29 NOV 2011
- Article first published online: 29 NOV 2011
- Accepted manuscript online: 17 AUG 2011 01:44PM EST
- Manuscript Accepted: 10 AUG 2011
- Manuscript Received: 1 JUN 2011
The purpose of this study was to evaluate the relationship between the slice thickness and the calculated volume in computed tomography (CT) liver volumetry through the comparison of the results from images [including 3-dimensional (3D) images] with various slice thicknesses. Twenty potential adult liver donors (12 men and 8 women) with a mean age of 39 years (range = 24-64 years) underwent CT with a 64-section multidetector row CT scanner after the intravenous injection of a contrast material. Four image sets with slice thicknesses of 0.625, 2.5, 5, and 10 mm were used. First, a program developed in our laboratory for automated liver extraction was applied to the CT images, and the liver boundaries were determined automatically. Then, an abdominal radiologist reviewed all images onto which automatically extracted boundaries had been superimposed and then edited the boundaries on each slice to enhance the accuracy. The liver volumes were determined via the counting of the voxels within the liver boundaries. The mean whole liver volumes estimated with CT were 1322.5 cm3 from 0.625-mm images, 1313.3 cm3 from 2.5-mm images, 1310.3 cm3 from 5-mm images, and 1268.2 cm3 from 10-mm images. The volumes calculated from 3D (0.625-mm) images were significantly larger than the volumes calculated from thicker images (P < 0.001). The partial liver volumes of right lobes, left lobes, and lateral segments were evaluated in a similar manner. The estimated maximum difference in the calculated volumes of lateral segments was −10.9 cm3 (−4.63%) between 0.625- and 5-mm images. In conclusion, liver volumes calculated from 2.5-mm-thick or thicker images are significantly smaller than liver volumes calculated from 3D images. If a maximum error of 5% in the calculated graft volume will not have a significant clinical impact, 5-mm-thick images are acceptable for CT volumetry. If the impact is significant, 3D images could be essential. Liver Transpl, 2011. © 2011 AASLD.