Fig. 5

TBR (A) and CNR (B) values derived from MRFDG images were significantly higher than those obtained from static images (3.56 ± 2.93 vs. 15.29 ± 17.96 for TBR, P < 0.01, 22.72 ± 19.29 vs. 56.29 ± 51.53 for CNR, P < 0.01). However, this was not the case when comparing delayed images with regular static images (3.56 ± 2.93 vs. 5.52 ± 4.95, P = 0.078 for TBR; 22.72 ± 19.29 vs. 20.72 ± 36.55, P = 0.59 for CNR). TBR was further assessed after dividing lesions into (C) pulmonary and (D) non-pulmonary lesions. Pulmonary lesions showed a considerably low background signal, for which TBR in the delayed image was not significantly different (P = 0.682, Fig. 5C). However, it was significantly different for the tumors in mediastinal and liver regions (P = 0.043, Fig. 5D). In contrast, TBR from the MRFDG was significantly higher in either group of lesions (P < 0.01)