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Peripheral Vessels: MR Angiography with Dedicated Phased-Array Coil with Large–Field-of-View Adapter—Feasibility Study¹

¹ From the Institute of Diagnostic Radiology (F.A.F., C.F., W.B., A.C.) and Department of Surgery (W.L.), Friedrich-Alexander-University Erlangen-Nürnberg, Maximiliansplatz 1, D-91054 Erlangen, Germany; Institute of Neuroradiology, Oberösterreichische Landesnervenklinik Wagner Jauregg, Linz, Austria (F.A.F.); and Department of Magnetic Resonance, Siemens Medical Solutions, Erlangen, Germany (M.R.). Received April 8, 2002; revision requested July 3; final revision received October 8; accepted October 14. Address correspondence to F.A.F. (e-mail: franz.fellner@gespag.at).

View larger version (57K): [in a new window]   Figure 1a. Functional description of the large-FOV adapter. (a) The adapter reroutes the circularly polarized spine coil signal (1, 2, 3) and, at the same time, frees a socket (4) for alternative use. This socket maps the signals from the body extender coil to the circularly polarized spine elements 1 and 2. (b) The large-FOV adapter (2) displaces the spine array coil at 370 mm along the table. (c) Sagittal scout images and (d) matching MR angiograms (coronal maximum intensity projections) obtained in different patients show the configuration of the coil elements (peripheral array and circularly polarized spine array coil) (c) without and (d) with the adapter. In c, visualization of the infrarenal aorta is incomplete. In d, the vascular tree can be seen from the thoracic aorta to the arteries in the feet.

View larger version (56K): [in a new window]   Figure 1b. Functional description of the large-FOV adapter. (a) The adapter reroutes the circularly polarized spine coil signal (1, 2, 3) and, at the same time, frees a socket (4) for alternative use. This socket maps the signals from the body extender coil to the circularly polarized spine elements 1 and 2. (b) The large-FOV adapter (2) displaces the spine array coil at 370 mm along the table. (c) Sagittal scout images and (d) matching MR angiograms (coronal maximum intensity projections) obtained in different patients show the configuration of the coil elements (peripheral array and circularly polarized spine array coil) (c) without and (d) with the adapter. In c, visualization of the infrarenal aorta is incomplete. In d, the vascular tree can be seen from the thoracic aorta to the arteries in the feet.

View larger version (79K): [in a new window]   Figure 1c. Functional description of the large-FOV adapter. (a) The adapter reroutes the circularly polarized spine coil signal (1, 2, 3) and, at the same time, frees a socket (4) for alternative use. This socket maps the signals from the body extender coil to the circularly polarized spine elements 1 and 2. (b) The large-FOV adapter (2) displaces the spine array coil at 370 mm along the table. (c) Sagittal scout images and (d) matching MR angiograms (coronal maximum intensity projections) obtained in different patients show the configuration of the coil elements (peripheral array and circularly polarized spine array coil) (c) without and (d) with the adapter. In c, visualization of the infrarenal aorta is incomplete. In d, the vascular tree can be seen from the thoracic aorta to the arteries in the feet.

View larger version (91K): [in a new window]   Figure 1d. Functional description of the large-FOV adapter. (a) The adapter reroutes the circularly polarized spine coil signal (1, 2, 3) and, at the same time, frees a socket (4) for alternative use. This socket maps the signals from the body extender coil to the circularly polarized spine elements 1 and 2. (b) The large-FOV adapter (2) displaces the spine array coil at 370 mm along the table. (c) Sagittal scout images and (d) matching MR angiograms (coronal maximum intensity projections) obtained in different patients show the configuration of the coil elements (peripheral array and circularly polarized spine array coil) (c) without and (d) with the adapter. In c, visualization of the infrarenal aorta is incomplete. In d, the vascular tree can be seen from the thoracic aorta to the arteries in the feet.

View larger version (81K): [in a new window]   Figure 2a. MR angiograms show peripheral vessels from the lower descending thoracic aorta to the pedal vessels in a 54-year-old patient with PAD. (a) Oblique maximum intensity projection shows occlusion of the right common and external iliac artery and depicts the superficial femoral artery (arrowheads). Arteriosclerotic mural irregularities of the common iliac artery are seen, as well as a moderate degree of stenosis of the external iliac artery (small arrow) and occlusion of the superficial femoral artery (large arrow). (b) Oblique and (c) sagittal maximum intensity projections depict occlusion of both superficial femoral arteries (arrows in b) and occlusion of the distal arteries to the pedal arch (arrow in c). Image quality is sufficient on both projections as a result of virtually isotropic voxel size.

View larger version (101K): [in a new window]   Figure 2b. MR angiograms show peripheral vessels from the lower descending thoracic aorta to the pedal vessels in a 54-year-old patient with PAD. (a) Oblique maximum intensity projection shows occlusion of the right common and external iliac artery and depicts the superficial femoral artery (arrowheads). Arteriosclerotic mural irregularities of the common iliac artery are seen, as well as a moderate degree of stenosis of the external iliac artery (small arrow) and occlusion of the superficial femoral artery (large arrow). (b) Oblique and (c) sagittal maximum intensity projections depict occlusion of both superficial femoral arteries (arrows in b) and occlusion of the distal arteries to the pedal arch (arrow in c). Image quality is sufficient on both projections as a result of virtually isotropic voxel size.

View larger version (45K): [in a new window]   Figure 2c. MR angiograms show peripheral vessels from the lower descending thoracic aorta to the pedal vessels in a 54-year-old patient with PAD. (a) Oblique maximum intensity projection shows occlusion of the right common and external iliac artery and depicts the superficial femoral artery (arrowheads). Arteriosclerotic mural irregularities of the common iliac artery are seen, as well as a moderate degree of stenosis of the external iliac artery (small arrow) and occlusion of the superficial femoral artery (large arrow). (b) Oblique and (c) sagittal maximum intensity projections depict occlusion of both superficial femoral arteries (arrows in b) and occlusion of the distal arteries to the pedal arch (arrow in c). Image quality is sufficient on both projections as a result of virtually isotropic voxel size.

View larger version (53K): [in a new window]   Figure 3a. MR angiograms obtained with the large-FOV adapter in a 56-year-old patient with PAD. (a) Coronal maximum intensity projection and (b) anteroposterior conventional angiogram show occlusion of the left superficial femoral artery (large arrows) and multiple low-grade stenoses (small arrows).

View larger version (45K): [in a new window]   Figure 3b. MR angiograms obtained with the large-FOV adapter in a 56-year-old patient with PAD. (a) Coronal maximum intensity projection and (b) anteroposterior conventional angiogram show occlusion of the left superficial femoral artery (large arrows) and multiple low-grade stenoses (small arrows).