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Updated: Jan 31, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
Published on: December 19, 2017
Evaluation of patient effective dose in a PET/CT test
Fernanda Guerra Paiva1, Priscila do Carmo Santana2, Arnaldo Prata Mourão3
1Departamento de Engenharia Nuclear, Programa de Pós Graduação em Ciências e Técnicas Nucleares, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos 6627, Belo Horizonte, MG 31270-901, Brazil.
Abstract:
The positron emission tomography (PET)/computed tomography (CT) technique generates high doses in patients because two radiodiagnostic modalities are used in a single examination. In this study, the absorbed and effective doses generated by CT scans and by the incorporation of radiopharmaceutical solution were evaluated in 19 organs. It was found that 78.2% of the effective dose in PET/CT examinations comes from the CT scan. With an activity of 3.33 MBq/kg-1, 18F-FDG contributes 21.8% of the final effective dose.
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