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Making a PET-CT for radiotherapy
• Registration of bony anatomy of a diagnostic PET-CT to
planning CT is accurate
• baseline shift of tumor (shift relative to bony anatomy) frequently
occurs
• gated (4D) PET-CT scan
– SUV values higher than on blurred 3D scan
– More precise imaging of tumor
• Attenuation correction on a single phase (mid-ventilation) of a
4D CT scan provides reliable SUV values