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Abstract #1845

Circumferential Cyclic Strain in the Abdominal Aorta: Comparison of a Phase-Contrast Magnetic Resonance Imaging Vs. a FIESTA Method

Janice J. Yeung1,2, Andrea S. Les1, Jinha M. Park3, Robert J. Herfkens3, Ronald L. Dalman2, Charles A. Taylor1,2

1Bioengineering, Stanford University, Stanford, CA, USA; 2Surgery, Stanford University, Stanford, CA, USA; 3Radiology, Stanford University

We 1) report in vivo circumferential cyclic strain measurements in the supraceliac and infrarenal aorta of healthy subjects, using segmented vessel diameters to calculate the Green-Lagrange strain; and 2) compare results from a PC-MRI sequence vs. a bright-blood FIESTA sequence, using thresholding and manual segmentation techniques. Supraceliac and infrarenal strain levels were similar. Strain curves from FIESTA scans were cleaner and agreed with previous studies in strain and deformation levels. The FIESTA technique, which gives excellent tissue contrast regardless of flow, should be used to measure wall strain in preference to PC-MRI, which yields blurry vessel edges during diastole.