Evaluation of aortoiliac aneurysm before endovascular repair: Comparison of contrast- enhanced magnetic resonance angiography with multidetector row computed.

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Evaluation of aortoiliac aneurysm before endovascular repair: Comparison of contrast- enhanced magnetic resonance angiography with multidetector row computed tomographic angiography with an automated analysis software tool Amelie M. Lutz, MDa, Jürgen K. Willmann, MDa, Thomas Pfammatter, MDa, Mario Lachat, MDb, Simon Wildermuth, MDa, Borut Marincek, MDa, Dominik Weishaupt, MDa Journal of Vascular Surgery Volume 37, Issue 3, Pages 619-627 (March 2003) DOI: 10.1067/mva.2003.143 Copyright © 2003 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 1 Maximum intensity projections of both MRA (A) and CTA (B) data sets in 63-year-old patient with infrarenal aortic aneurysm. Centerline is calculated through infrarenal and both iliac arteries with gray-level gradients to determine voxel-level boundaries and with subvoxel interpolation process to estimate exact contour of vessel. Journal of Vascular Surgery 2003 37, 619-627DOI: (10.1067/mva.2003.143) Copyright © 2003 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 2 A, Plot of mean orthonormal luminal diameter versus position along median centerline of aorta and left iliac artery on basis of MRA data set obtained in 63-year-old patient considered for endovascular repair of aortic aneurysm. Cursor was moved along plot, and corresponding transverse sections were displayed dynamically for exact identification and origin of distance and cross-sectional measurements. Levels of largest (straight arrow) and of smallest (arrowhead) diameters of abdominal aorta and left common and external iliac artery can be assessed. Sagittal (B) and transverse (C) multiplanar reformations of MRA data set correspond to level of orange line in A. Transverse reformation was created strictly orthonormally to vessel centerline, whereas sagittal reformation was created longitudinally to vessel centerline. Numbers displayed on planar reformations (22.9 mm and 27.2 mm on B; Dmax = maximal diameter; Dmin = minimal diameter on C, respectively) correspond to smallest and largest vessel diameter at this level. Journal of Vascular Surgery 2003 37, 619-627DOI: (10.1067/mva.2003.143) Copyright © 2003 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 3 A, Schematic drawing shows measurement points of diameter and length dimensions that were measured with automated vessel analysis software with either CTA or MRA data in patients with infrarenal aortic aneurysms. a, Diameter at level of most caudal renal artery. b, Diameter at level of proximal end of aneurysm. c, Diameter at level of aortic bifurcation. d, Largest diameter of right common iliac artery. e, Largest diameter of left common iliac artery. f, Smallest diameter of right external iliac artery. g, Smallest diameter of left external iliac artery. h, Length of aneurysm neck. i, Craniocaudal length of entire aneurysm. j, Length of infrarenal aorta ranging from renal arteries to iliac bifurcation. k, Distance between most caudal renal artery and right iliac bifurcation. l, Distance between most caudal renal artery and left iliac bifurcation. B, Method of measuring angle between most caudal renal artery and aortic bifurcation is displayed on maximum intensity projection of MRA. Journal of Vascular Surgery 2003 37, 619-627DOI: (10.1067/mva.2003.143) Copyright © 2003 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 4 Graph shows regression analysis of real stent graft length and stent graft length as measured with vessel analysis software. Regression plot shows excellent correlation (R2 = 0.99) between stent graft length as measured in CTA and true stent graft length according to manufacturer data. Journal of Vascular Surgery 2003 37, 619-627DOI: (10.1067/mva.2003.143) Copyright © 2003 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions