Case: Nuclear Medicine (also known as Molecular Imaging)

A 58-year-old female patient with a history of breast cancer is undergoing a follow-up PET scan to evaluate the response to chemotherapy. The PET scan images are to be registered with previous CT scans stored in the PACS to assess changes in metabolic activity of the tumor.

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LABAI-GENERATED

The PET scan shows areas of increased uptake in the left breast and axillary region, indicating potential residual disease. The images need to be aligned with previous CT scans to assess changes in tumor size and metabolic activity.

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What is the primary purpose of registering PET images with CT scans in this scenario?