Quantitative analysis of two-phase 3D+time aortic MR images

Fei Zhao; Honghai Zhang; Nicholas E. Walker M.D.; Fuxing Yang; Mark E. Olszewski; Andreas Wahle; Thomas Scholz M.D.; Milan Sonka M.D.

doi:10.1117/12.652763

10 March 2006 Quantitative analysis of two-phase 3D+time aortic MR images

Fei Zhao, Honghai Zhang, Nicholas E. Walker M.D., Fuxing Yang, Mark E. Olszewski, Andreas Wahle, Thomas Scholz M.D., Milan Sonka M.D.

Author Affiliations +

Proceedings Volume 6144, Medical Imaging 2006: Image Processing; 614423 (2006) https://doi.org/10.1117/12.652763
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

Automated and accurate segmentation of the aorta in 3D+time MR image data is important for early detection of connective tissue disorders leading to aortic aneurysms and dissections. A computer-aided diagnosis method is reported that allows the objective identification of subjects with connective tissue disorders from two-phase 3D+time aortic MR images. Our automated segmentation method combines level-set and optimal border detection. The resulting aortic lumen surface was registered with an aortic model followed by calculation of modal indices of aortic shape and motion. The modal indices reflect the differences of any individual aortic shape and motion from an average aortic behavior. The indices were input to a Support Vector Machine (SVM) classifier and a discrimination model was constructed. 3D+time MR image data sets acquired from 22 normal and connective tissue disorder subjects at end-diastole (R-wave peak) and at 45% of the R-R interval were used to evaluate the performance of our method. The automated 3D segmentation result produced accurate aortic surfaces covering the aorta from the left-ventricular outflow tract to the diaphragm and yielded subvoxel accuracy with signed surface positioning errors of -0.09±1.21 voxel (-0.15±2.11 mm). The computer aided diagnosis method distinguished between normal and connective tissue disorder subjects with a classification correctness of 90.1 %.

Citation Download Citation

Fei Zhao, Honghai Zhang, Nicholas E. Walker M.D., Fuxing Yang, Mark E. Olszewski, Andreas Wahle, Thomas Scholz M.D., and Milan Sonka M.D. "Quantitative analysis of two-phase 3D+time aortic MR images", Proc. SPIE 6144, Medical Imaging 2006: Image Processing, 614423 (10 March 2006); https://doi.org/10.1117/12.652763

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