Dosimetry of patients submitted to cerebral PET/CT for the diagnosis of mild cognitive impairment.
OBJECTIVE
The present study was aimed at evaluating the effective radiation dose in patients submitted to PET/CT for the diagnosis of mild cognitive impairment.


METHODS
TLD-100 detectors inserted into an Alderson Rando® anthropomorphic phantom were utilized to measure the absorbed dose coming from the CT imaging modality. The anthropomorphic phantoms (male and female adult versions) were submitted to the same technical protocols for patients' images acquisition. The absorbed dose resulting from the radiopharmaceutical injection was estimated by means of the model proposed by the ICRP publication 106.


RESULTS
The effective dose in patients submitted to this diagnostic technique was approximately (5.34 ± 1.99) mSv.


CONCLUSIONS
Optimized protocols for calculation of radioactive activity injected into patients submitted to this diagnostic technique might contribute to reduce the effective radiation dose resulting from PET/CT in the diagnosis of mild cognitive impairment.
PhD, Associate Professor, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
Priscila do Carmo
Pdo C
Santana
PhD, Associate Professor, Centro Federal de Educação Tecnológica de Minas Gerais (Cefet-MG), Belo Horizonte, MG, Brazil.
Arnaldo Prata
AP
Mourão
PhD, Associate Professor, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
Paulo Márcio Campos
PM
de Oliveira
Graduate Student of Technology in Radiology, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
Felipe Dias
FD
Bernardes
Research Fellow, Full Professor, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
Marcelo
M
Mamede
Research Fellow, Titular Researcher, Centro de Desenvolvimento da Tecnologia Nuclear - Comissão Nacional de Energia Nuclear (CDTN-CNEN), Belo Horizonte, MG, Brazil.
Teógenes Augusto
TA
da Silva
Comprometimento cognitivo leve; Dosimetria; PET/CT