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Intraarterial Contrast-Enhanced MR Aortography With and Without Parallel Acquisition Technique in Patients with Peripheral Arterial Occlusive Disease

¹ Institute of Diagnostic Radiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland.
² Biocenter, University of Basel, 4056 Basel, Switzerland.
³ Department of Angiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland.

View larger version (109K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1 —Photograph shows aortic flow phantom. Acrylic tube with inner diameter of 12 mm represents human infrarenal aorta. At pulsatile flow of 30 mL/s, solution of diluted gadolinium and physiologic saline solution representing blood was pumped through tube. Tube was placed in box filled with solution of gadolinium and ferumoxsil representing muscle tissue.

View larger version (109K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2 —Anterior reference image from intraarterial MR aortogram obtained with standard technique shows regions of interest selected for data analysis. 1 = right renal artery, 2 = left renal artery, 3 = aorta, 4 = right common iliac artery, 5 = left common iliac artery, 6 = gluteal muscle, 7 = air outside body.

View larger version (91K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3A —90-year-old man with peripheral arterial occlusive disease. Anteroposterior maximum intensity projection 3D fast low-angle shot (FLASH) intraarterial MR aortogram obtained with standard technique.

View larger version (95K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3B —90-year-old man with peripheral arterial occlusive disease. Anteroposterior maximum intensity projection 3D FLASH intraarterial MR aortogram obtained with parallel acquisition technique (generalized autocalibrating partially parallel acquisition). Good runoff is evident in distal abdominal aorta and iliac axis on right side. Because of shielding artifacts of 10 mm/6 cm Smart stent (Cordis) no signal intensity is depicted in lumen of stent. Runoff in periphery is well depicted.

View larger version (134K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3C —90-year-old man with peripheral arterial occlusive disease. Intraarterial digital subtraction angiogram of infratruncal abdominal aorta shows high-grade stenosis of left external iliac artery, which was treated with stent.

View larger version (95K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —78-year-old man with peripheral arterial occlusive disease. Lumbar arteries are evident with both MRI acquisition techniques. Iliac axis has good runoff on both sides after percutaneous transluminal angioplasty. Anteroposterior maximum intensity projection 3D fast low-angle shot (FLASH) intraarterial MR aortogram obtained with standard technique.

View larger version (94K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —78-year-old man with peripheral arterial occlusive disease. Lumbar arteries are evident with both MRI acquisition techniques. Iliac axis has good runoff on both sides after percutaneous transluminal angioplasty. Anteroposterior maximum intensity projection 3D FLASH intraarterial MR aortogram obtained with parallel acquisition technique (generalized autocalibrating partially parallel acquisition).

View larger version (150K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4C —78-year-old man with peripheral arterial occlusive disease. Lumbar arteries are evident with both MRI acquisition techniques. Iliac axis has good runoff on both sides after percutaneous transluminal angioplasty. Intraarterial digital subtraction angiogram of infratruncal abdominal aorta shows good runoff in distal abdominal aorta and renal arteries on both sides, lower-pole artery on right side.

View larger version (117K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5A —58-year-old man with peripheral arterial occlusive disease and lymphoma. Anteroposterior maximum intensity projection 3D fast low-angle shot (FLASH) intraarterial MR aortogram obtained with standard technique.

View larger version (112K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5B —58-year-old man with peripheral arterial occlusive disease and lymphoma. Anteroposterior maximum intensity projection 3D FLASH intraarterial MR aortogram obtained with parallel acquisition technique (generalized autocalibrating partially parallel acquisition) after angioplasty shows good runoff in distal abdominal aorta with only mild arteriosclerotic plaques and clearly depicted renal arteries on both sides.

View larger version (136K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5C —58-year-old man with peripheral arterial occlusive disease and lymphoma. Intraarterial digital subtraction angiogram of infratruncal abdominal aorta before treatment shows high-grade stenosis of common iliac artery on right side.

View larger version (8K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6 —Mean contrast- to-noise ratio (CNR) obtained with aortic flow phantom. Bar graph shows comparison of CNRs between standard acquisition technique (black) and parallel acquisition technique (white).

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