Uni- and bidirectional wide angle CT colonography: effect on missed areas, surface visualization, viewing time and polyp conspicuity.
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| Title: | Uni- and bidirectional wide angle CT colonography: effect on missed areas, surface visualization, viewing time and polyp conspicuity. |
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| Authors: | East JE (AUTHOR), Saunders BP (AUTHOR), Boone D (AUTHOR), Burling D (AUTHOR), Halligan S (AUTHOR), Taylor SA (AUTHOR), East, James E1 (AUTHOR), Saunders, Brian P (AUTHOR), Boone, Darren (AUTHOR), Burling, David (AUTHOR), Halligan, Steve (AUTHOR), Taylor, Stuart A (AUTHOR) |
| Source: | European Radiology. Sep2008, Vol. 18 Issue 9, p1910-1917. 8p. |
| Abstract: | The effect of field of view on mucosal visualisation and reader efficiency during three-dimensional endoluminal CT colonography (CTC) was investigated. Twenty CTC datasets were reviewed at standard 90-degree and "wide" 140-degree viewing angles using customised viewing software (V3D colon; Viatronix), which listed number and size of missed mucosal areas ("missed regions tool") and percentage mucosal visualisation. We compared: (1) unidirectional and bidirectional flythrough using 140- versus 90-degree viewing angles; (2) reader analysis time comparing unidirectional 140-degree flythrough versus bidirectional 90-degree flythrough; (3) paired image snapshots of 12 polyps taken at each field of view were reviewed to assess conspicuity. All patients underwent conventional colonoscopy. Bidirectional 140-degree review reduced the numbers of missed areas by between eight- and 40-fold depending on size category, including those >1,000 mm(2), compared with standard 90-degree bidirectional flythrough (P < 0.001). Combined prone-supine unidirectional 140-degree flythrough and missed area review was 3.8 min faster than 90-degree bidirectional review (9.3 versus 5.5 min, P < 0.0001) for the same surface visualisation. When viewed as pairs, polyps were rated more conspicuous with a 90-degree field of view, P = 0.03. Wide-angle (140-degree) CTC can reduce both numbers of missed areas and review times. However, this may be at the expense of polyp conspicuity. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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