Figure 2
CT images of a 43-year-old male patient with lymphoma. (1a, 2a, 3a) Conventional images of para-iliac LNs in the AP. (1b, 2b, 3b) Iodine density images in the same layer as AP scans. (1c, 2c, 3c) SUVmax in 18F-FDG PET/CT images. (4) Spectral curves in the AP and VP (λHU-AP: ROI S1, S3, S5; λHU-VP: S2, S4, S6). For LNs in region 1: LD = 20.60 mm, SUVmax = 20.1, IC-AP = 0.49 mg/mL, NIC-AP = 0.08 mg/mL, λHU-AP = 0.98, IC-VP = 0.67 mg/mL, NIC-VP = 0.22 mg/mL, and λHU-VP = 1.34. For LNs in region 2: LD = 8.2 mm, SUVmax = 6.70, IC-AP = 0.43 mg/mL, NIC-AP = 0.07 mg/mL, λHU-AP = 0.87, IC-VP = 0.57 mg/mL, NIC-VP = 0.19 mg/mL, andλHU-VP = 0.72. For LNs in region 3: LD = 8.0 mm, SUVmax = 1.30, IC-AP = 0.45 mg/mL, NIC-AP = 0.08 mg/mL, λHU-AP = 0.90, IC-VP = 0.51 mg/mL, NIC-VP = 0.17 mg/mL, and λHU-VP = 1.03. The SUVmax of mediastinal blood pool was 2.3. LNs in regions 1 and 2 were positive. LNs in region 3 were negative. AP: arterial phase; VP: venous phase; LD: long-axis diameter; NIC: normalized iodine concentration; λHU: spectral curve slope; SUVmax: maximum standardized uptake value.
