The book describes an efficient automatic algorithm for the segmentation of the inner and outer boundary of an abdominal aortic aneurysm in cross-sectional computed tomography angiography acquisitions. It covers the medical and technical background, the related publications for such problem, the algorithm implemented by us to segment the abdominal aortic aneurysm in detail, and the experiments and evaluation as well. Readers will thus be informed the motivation and challenge in doing arotic aneurysm segmentation, how this problem can be solved and how good the result is.This book is intended for all those who work in the field of medical image segmentation in CT, specially in aortic aneurysm segmentation.