Fig. 4From: Prospective study of 11C–methionine PET for distinguishing between recurrent brain metastases and radiation necrosis: limitations of diagnostic accuracy and long-term results of salvage treatmentComparison of LNRs between the first and second MET-PET in 4 patients. The LNR of the second scan (median: 3.55) showed a marked increase as compared to that on the first scan (median: 1.70) (P = 0.039, Paired t test)Back to article page