MR angiography of the hand arteries.

Abstract

The aim of this study was to optimize different magnetic resonance angiography (MRA) techniques and to evaluate MRA of the hand arteries compared to intraarterial digital subtraction angiography (IA-DSA). The MRA examinations were performed on a 1.5-T system equipped with a flexible surface coil. The protocol contained time-of-flight (TOF), rephased/dephased (Re/De), and contrast enhanced (CE) techniques. Maximum intensity projection (MIP) was used for postprocessing. The IA-DSA procedure was performed as pharmaco-angiography (after intraarterial injection of a vasodilatator) via a transbrachial approach. Nine patients suffering from peripheral vascular disease were examined with IA-DSA, TOF-MRA, and Re/De-MRA; six patients were examined with CE-MRA and IA-DSA. Best overall image quality was attained with IA-DSA, followed by TOF-MRA, Re/De-MRA, and CE-MRA. Selective arterial visualization of digital arteries was possible with IA-DSA and TOF-MRA. Rephased/dephased MRA showed venous overlay. Contrast-enhanced MRA was limited by inconstant quality of bolus timing. Appropriate arterial bolus timing was achieved in four of six patients; one examination showed venous overlay, one examination incomplete arterial enhancement. Time-of-flight MRA detected 96% of the digital artery segments that were identified with IA-DSA and revealed 34 segments that were failed on IA-DSA. Rephased/dephased MRA and CE-MRA were inferior to IA-DSA and TOF-MRA regarding detection of digital arteries. Magnetic resonance angiography with optimized protocols is a noninvasive procedure to visualize hand arteries in patients with ischemic disease. With TOF-MRA it is possible to detect angiographically occluded arterial segments of digital arteries.