CAD False negative

Representative examples of CAD false negatives are shown in Figure 11.6. Figure 11.6a shows a magnified view of a 6-mm polyp at the proximal transverse colon (white arrow), and Fig. 11.6b shows its 3D endoscopic view (white arrow). This polyp was located in a narrow valley where two folds merge, and thus the shape of the polyp was distorted. Moreover, a motion artifact made the polyp appear blurred, and thus it was a false-negative polyp. The neighboring polyp (black arrow), located below the... 

Fig. 11.6a-d. Example of CAD false negatives. (Reprint, with permission, from Yoshida and Dachman 2005)... 

The types of false-negatives included in CAD results are similar to those encountered by radiologists (Yoshida et al. 2002a Yoshida et al. 2002b). Most CAD techniques depend on a shape analysis... 

Knowing the typical patterns of pitfalls, for example types of false-positives and negatives that frequently occur in CAD, is important for the efficient use of CAD as a detection aid in a clinical setting. The following subsections explain common sources of false-positives and negatives in CAD. 

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