INFLUENCE OF FIELD STRENGTH ON INTRACRANIAL VESSEL CONSPICUITY IN CANINE MAGNETIC RESONANCE ANGIOGRAPHY |
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| Authors: | DANIEL RODRIGUEZ HELENA RYLANDER KARL K VIGEN WILLIAM M ADAMS |
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| Institution: | Department of Surgical Sciences, University of Wisconsin, Madison;and Department of Radiology, University of Wisconsin, Madison |
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| Abstract: | Eight neurologically normal beagles were imaged using three-dimensional (3D) time-of-flight magnetic resonance angiography (MRA) in a 3 T magnetic resonance scanner. Four of the eight dogs were also imaged using a 1 T unit for comparison. Ten intracranial arteries were consistently identified at 3 T: external and internal carotid, basilar, vertebral, rostral cerebral, middle cerebral, caudal cerebral, rostral communicating, caudal communicating, and ventral spinal arteries. Only four were reliably identified at 1 T with diagnostic spatial and contrast resolution. At 3 T, vessels as small as 1 mm were reliably detected. Vessel conspicuity was superior using the 3 T system. An anatomic atlas of the canine circulus arteriosus cerebri using a 3 T scan was constructed. The effect of MRA parameters on vascular spatial resolution and conspicuity are reviewed. |
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| Keywords: | anatomy circle of willis intracranial arteries magnetic resonance angiography |
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