Masataka Sugiyama1, Yasuo Takehara2, Hatsuko Nasu1, Shuhei Yamashita1, Mika Kamiya1, Nobuko Yoshizawa1, Yuki Hirai1, Takasuke Ushio1, Naoko Hyodo1, Yohei Ito1, Naoki Oishi2, Marcus Alley3, Tetsuya Wakayama4, and Harumi Sakahara1
1Radiology, Hamamatsu University School of Medicine, Hamamatsu, Japan, 2Radiology, Hamamatsu University Hospital, Hamamatsu, Japan, 3Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States, 4Applied Science Laboratory Asia Pacific, GE Healthcare Japan, Hino, Japan
3D cine PC MRI (4D-flow) study of abdominal aorta was conducted to measure wall shear stress (WSS) and to characterize aortic blood flow dynamics within saccular and fusiform abdominal aortic aneurysm and non-dilated aorta. Peak systolic WSS was significantly lower within saccular aneurysm, and stream line analysis depicted separated vortex flow within the saccular aneurysm. The abnormal vortex flow and consequent low WSS of saccular aneurysmal wall may be reflecting the
continuing risk of atherogenic changes of the saccular aneurysm in contrast to fusiform aneurysm.