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FIGURE 1. Selection of ROIs in 57-y-old patient before chemotherapy. (A) Graded color-scaled parametric analysis applied in reconstructed coronal PET image shows most active tumor in upper abdomen. (B) Transverse PET image with a higher scale reveals celiac tumor (T) with activity profile crossing the hottest point (red spot). (C) Corresponding activity profile in counts-per-pixel. Isocontours are drawn with lower autocontour threshold of 4,500 counts-per-pixel (red isocontour at inset in B). (D) Normal background tissue (N): 2 large ROIs are manually selected on gluteal muscles, avoiding iliac bone marrow activity.
