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Fig. 3 | Cancer Imaging

Fig. 3

From: Accurate FDG PET tumor segmentation using the peritumoral halo layer method: a study in patients with esophageal squamous cell carcinoma

Fig. 3

Visual patterns of the tumors. a Visually homogeneous pattern. The hottest core (black arrow) was located in the center of the ESCC. There were no significant irregular layers in the tumor. PHL (50–60% of SUVmax; yellowish green layer) was located between the tumor and the background activity (red arrow). PHL tumor threshold (red dotted arrow) was determined to be 60% of SUVmax (i.e., the innermost portion of the PHL). b Visually heterogeneous pattern. The hottest core was eccentrically located in the ESCC, and a small cold defect was visible (small yellowish green portion in black dotted circle). An irregular layer was also present (black dotted arrow). PHL (20–30% of SUVmax; light blue layer) was located between the tumor and the background activity (red arrow). PHL tumor threshold (red dotted arrow) was determined to be 30% of SUVmax (i.e., the innermost portion of the PHL). c Visually heterogeneous pattern. The hottest core was eccentrically located in the ESCC (black arrow). A prominent irregular layer was present (black dotted arrow). PHL (20–30% of SUVmax; light blue layer) was located between the tumor and the background activity (red arrow). PHL tumor threshold (red dotted arrow) was determined to be 30% of SUVmax (i.e., the innermost portion of the PHL)

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