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. 2009 Aug;30(7):1445–1450. doi: 10.3174/ajnr.A1509

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American Society of Neuroradiology

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Fig 3. — A 68-year-old man. CT axial images applying different window parameters. A and B, Intraluminal Hounsfield unit value is 547 (right bulbus). With a 275 width and 30 level (A) and 600/200 (B), it is not possible to differentiate lumen from calcification. C, With 800/300, it is possible to differentiate opacified lumen and calcification. D, By using equations described in this article, we obtained window parameters of 1132/394; a clear differentiation between lumen and parietal calcifications is visible.