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Contrast-Enhanced Bolus-Chased Whole-Body MR Angiography Using a Moving Tabletop and Quadrature Body Coil Acquisition

Department of Radiology, Cappagh National Orthopedic Hospital, Cappagh Hospital, Finglas, Dublin, Ireland 11.

View larger version (36K): [in a new window]   Fig. 1 —Schematic of k-space filling using contrast-enhanced timing-robust angiography technique. Random filling of predefined central circle occurs that allows entire arterial bolus to be mapped to center of k-space, maximizing contrast resolution. Remainder of k-space is filled during arteriovenous window in concentric profile order, maximizing venous suppression. (Fig. 1 courtesy of Koert Bloemers, Philips Medical Systems.)

View larger version (36K): [in a new window]   Fig. 2 —Mean quantitative and qualitative assessment of individual arterial segments. SNR = signal-to-noise ratio (blue bars), R = right, ICA = internal carotid artery, VA = vertebral artery, L = left, CCA = common carotid artery, BCT = brachiocephalic trunk, LSCA = left subclavian artery, DAA = (descending) abdominal aorta, DTA = descending thoracic artery, AA = abdominal aorta, RA = renal artery, CIA = common iliac artery, CFA = common femoral artery, SFA(P) = proximal superficial femoral artery, SFA(D) = distal superficial artery/popliteal artery, PTA = posterior tibial artery, ATA = ascending thoracic aorta, PA = peroneal artery. For ease of presentation, mean qualitative score (red bars) recorded has been multiplied by 100.

View larger version (37K): [in a new window]   Fig. 3A —28-year-old female volunteer. Whole-body MR angiogram shows good delineation of extracranial and extracardiac arterial system. There is obvious jugular and portal venous overlay and filling of pulmonary vessels. Right subclavian artery has been excluded from field of view due to technical error.

View larger version (44K): [in a new window]   Fig. 3B —28-year-old female volunteer. Examination of source images shows good depiction of origin of left renal artery. Part of right renal artery is also shown.

View larger version (74K): [in a new window]   Fig. 3C —28-year-old female volunteer. Zoomed maximum-intensity-projection images of great vessels allow easy depiction of anatomy. These images can be interactively interrogated at workstation.

View larger version (44K): [in a new window]   Fig. 4 —64-year-old woman with history of endometrial carcinoma. Whole-body MR angiography confirms vascular nature of two metastatic deposits to lateral thigh compartment. No other vascular metastases are seen. Entire extracranial and extracardiac vascular tree is well visualized. Left subclavian is mostly excluded due to positioning.

View larger version (38K): [in a new window]   Fig. 5A —56-year-old man with symptomatic right-sided pain and history of cemented hip arthroplasty 3 years previously. Whole-body MR angiogram depicts long segment of stenosis in right common femoral artery, with reconstitution in proximal right superficial artery. Venous contamination of the run-off on left side is present, but reference to source images (not shown) allows easy examination of these veins, except for posterior tibial vein, which is partially obscured. Again, part of subclavian vein is excluded due to positioning or possibly T2* effect from adjacent subclavian vein.

View larger version (78K): [in a new window]   Fig. 5B —56-year-old man with symptomatic right-sided pain and history of cemented hip arthroplasty 3 years previously. Composite images from selective right-sided digital subtraction angiography confirm occlusion. Patient's prosthesis does not interfere with MR images.

View larger version (47K): [in a new window]   Fig. 6 —48-year-old man with left-sided claudication. Whole-body MR angiography shows marked irregularity of origin of left common iliac artery (arrowhead). Long segment occlusion of mid superficial femoral artery is also seen (arrow).

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