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Read e-book online Atlas of Virtual Colonoscopy PDF

By David J. Vining (auth.), Abraham H. Dachman MD (eds.)

ISBN-10: 0387215581

ISBN-13: 9780387215587

ISBN-10: 1441930310

ISBN-13: 9781441930316

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200 1b). Finally, as stated above, the amount of time for data evaluation using these 3D techniques may limit its use in a clinical setting. Primary 3D imaging techniques need to become faster and more automated with ease of navigation before they can be relied upon as a primary viewing technique. Despite these limitations, it is possible that by evaluating 3D endoluminal images, both antegrade and retrograde, smaller polyps «5 mm) can be routinely detected. A recent study found that using axial images, as well as complete 3D endoluminal navigation in antegrade and retrograde directions in both the supine and prone positions, detection of polyps :55 mm was 59% (Yee et aI.

It can be seen that this has central high attenuation and therefore is not a polyp (arrow). 4. 7. Normal endoluminal view of sigmoid/descending colon junction. In the foreground the folds are effaced by the pressure of the distension, giving a relatively featureless appearance. In the more distal aspect of this view, several delicate folds are visualized (arrow). Normal Colon Adequate insufflation with gas (either room air or C02 gas) results in a well-distended colon. Depending on the degree of distension, the appearance of the normal colonic lumen will vary with 3D rendering.

Many software programs permit problem solving of multiple "bookmarked" areas all at once, at the end of your review. 3. If your software will not show simultaneous prone and supine images, use 4-on-1 axial, coronal, sagittal, and oblique MPRs of one patient position at a time (Johnson et al. 2000). Another advantage of this approach is that you are guaranteed to see 100% of the scanned mucosal surface, unlike a primary endoluminal read in which some mucosa is obscured. In summary, it appears that reliance upon a primary 2D interpretation technique, with MPR and 3D imaging used for problem solving only, allows data to be interpreted in a timeefficient manner with excellent sensitivity (>90%) for polyps 2:10 mm (Dachman et al.

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Atlas of Virtual Colonoscopy by David J. Vining (auth.), Abraham H. Dachman MD (eds.)


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