Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center.

Objective: To evaluate the level of ambient radiation in a PET/CT center.

Materials And Methods: Previously selected and calibrated TLD-100H thermoluminescent dosimeters were utilized to measure room radiation levels. During 32 days, the detectors were placed in several strategically selected points inside the PET/CT center and in adjacent buildings.

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.

Materials And 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.