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Head and Neck: Circle of Willis
 
Go Waaijer A, Prokop M, Velthuis BK, Bakker CJ, de Kort GA, van Leeuwen MS. March 2007 Circle of Willis at CT Angiography: Dose Reduction and Image Quality—Reducing Tube Voltage and Increasing Tube Current Settings

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Venema Henk W., Hulsmans Frans Jan H., den Heeten Gerard J. March 2001 CT Angiography of the Circle of Willis and Intracranial Internal Carotid Arteries: Maximum Intensity Projection with Matched Mask Bone Elimination—Feasibility Study.

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Katz DA, Marks MP, Napel SA, Bracci PM, Roberts SL May 1995 Circle of Willis: evaluation with spiral CT angiography, MR angiography, and conventional angiography.

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Vieco PT, Shuman WP, Alsofrom GF, Gross CE Aug. 1995 Detection of circle of Willis aneurysms in patients with acute subarachnoid hemorrhage: a comparison of CT angiography and digital subtraction angiography.