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EDUCATION EXHIBIT |
1 From the Russell H. Morgan Department of Radiology, Johns Hopkins School of Medicine, 601 N Caroline St, Room 3251, Baltimore, MD 21287 (E.K.F., D.G.H., F.M.C., K.M.H., P.T.J.); and HipGraphics, Towson, Md (D.R.N., D.G.H.). Presented as an education exhibit at the 2004 RSNA Annual Meeting. Received October 11, 2005; revision requested November 4 and received December 19; accepted December 20. D.G.H. and D.R.N. are founders of HipGraphics; D.G.H. is a consultant to HipGraphics; D.R.N. is a full-time employee of HipGraphics; E.K.F. is a co-founder of Hip-Graphics and a consultant to Siemens Medical Solutions and GE Healthcare; and the other authors have no financial relationships to disclose. Address correspondence to E.K.F. (e-mail: efishman{at}jhmi.edu).
The introduction and widespread availability of 16-section multi–detector row computed tomographic (CT) technology and, more recently, 64-section scanners, has greatly advanced the role of CT angiography in clinical practice. CT angiography has become a key component of state-of-the-art imaging, with applications ranging from oncology (eg, staging of pancreatic or renal cancer) to classic vascular imaging (eg, evaluation of aortic aneurysms and renal artery stenoses) as well as newer techniques such as coronary artery imaging and peripheral runoff studies. With an average of 400–1000 images in each volume data set, three-dimensional postprocessing is crucial to volume visualization. Radiologists now have workstations that provide capabilities for evaluation of these data sets by using a range of software programs and processing tools. Although different systems have unique capabilities and functionality, all provide the options of volume rendering and maximum intensity projection for image display and analysis. These two postprocessing techniques have different advantages and disadvantages when used in clinical practice, and it is important that radiologists understand when and how each technique should be used.
© RSNA, 2006
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