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Table 1 Grading scale for lesions, with uptake compared to mediastinum and liver uptake

From: 3D absorbed dose distribution estimated by Monte Carlo simulation in radionuclide therapy with a monoclonal antibody targeting synovial sarcoma

Grade Lesion uptake ratio
Grade 0 Lesion uptake < 20% mediast. uptake
Grade I Lesion uptake < 80% mediast. uptake
Grade II Lesion uptake > 80% and < 120% mediast. uptake
Grade III Lesion uptake > 120% mediast. and < 80% liver uptakes
Grade IV Lesion uptake > 120% liver uptake