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Unenhanced MR Angiography of the Thoracic Aorta: Initial Clinical Evaluation

¹ Department of Radiology, Northwestern University, Chicago, IL.
² Present address: Department of Radiology, University of Wisconsin-Madison, 600 Highland Ave., Madison, WI 53792.
³ MR Research and Development, Siemens Medical Solutions, Inc., Malvern, PA.

View larger version (8K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1 —Schematic of ECG-triggered, navigator-gated, T2-prepared, segmented, steady-state free precession sequence. TRui (TR shown on user interface) includes T2 preparation time (T2 prep), fat-suppression time (FS), linear flip angle preparation (preps), data acquisition, and spoiler. TRui does not include time for navigator pulses (Nav).

View larger version (51K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2A —23-year-old man with history of Ross procedure and dilated aortic root. Volume-rendered image from 3D steady-state free precession (SSFP) data set indicates seven locations at which measurements were made: 1, annulus; 2, sinuses of Valsalva; 3, sinotubular junction; 4, mid ascending aorta; 5, proximal arch; 6, distal arch; and 7, descending aorta.

View larger version (44K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2B —23-year-old man with history of Ross procedure and dilated aortic root. Multiplanar reformatted images from 3D SSFP (left) and contrast-enhanced MR angiography (right) data sets at annulus, sinuses of Valsalva, sinotubular junction, mid ascending aorta, proximal arch, distal arch, and descending aorta.

View larger version (122K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3 —26-year-old woman with congenital bicuspid aortic valve and ascending aortic aneurysm. Coronal 3D steady-state free precession image also shows evidence of aortic insufficiency (arrow).

View larger version (74K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4 —55-year-old man with aortic coarctation. Volume-rendered image from 3D steady-state free precession data set confirms aortic coarctation (arrow).

View larger version (147K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5 —25-year-old woman with congenital ascending aortic hypoplasia. Coronal 3D steady-state free precession image shows severe narrowing of entire ascending aorta (circle).

View larger version (44K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6 —26-year-old woman with congenital bicuspid aortic valve and ascending aortic aneurysm. Multiplanar reformatted images from 3D steady-state free precession (left) and contrast-enhanced MR angiography (CE-MRA) (right) data sets reveal greater blurring on CE-MRA images at annulus, sinuses of Valsalva, and sinotubular junction.

View larger version (9K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7 —Bland-Altman plot shows no minimal significant difference in measurements made with 3D steady-state free precession and contrast-enhanced MR angiography data sets.

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