RT Journal Article SR Electronic T1 MRA delineation of the vertebral-basilar system in patients with hemifacial spasm and trigeminal neuralgia. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 34 OP 36 VO 14 IS 1 A1 Tien, R D A1 Wilkins, R H YR 1993 UL http://www.ajnr.org/content/14/1/34.abstract AB Detailed depiction of the vertebral-basilar system is often obscured by other vascular structures on the MR angiogram. A special MR angiography technique that can better delineate the branches of the vertebral-basilar system has been designed and has proved particularly useful in the identification of tortuous vascular branches when they come in contact with the seventh or fifth cranial nerves.