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. 2014 Jan 21;9(1):e84937. doi: 10.1371/journal.pone.0084937

Figure 5. Illustration chart indicating the diagnostic role for accuracy of CTA at the artery and segment levels.

Figure 5

At the artery and segment levels, the likelihood ratio profile of CT was both an exclusion and s confirmation test to diagnose stenosis >50% (positive likelihood ratio >10; negative likelihood ratio <0.1), while CTA was generally a test of exclusion to rule out significant stenosis at the patient level (LRP =  positive likelihood ratio, LRN  =  negative likelihood ratio, LLQ  =  left lower quadrant, LUQ  =  left upper quadrant, RLQ  =  right lower quadrant, RUQ  =  right upper quadrant).