Prostate-specific membrane antigen (PSMA) is a type II transmembrane protein. It has been shown to be expressed in various solid malignant neoplasms. We report a case of a prostate cancer patient who underwent ⁶⁸Ga-PSMA PET/CT imaging. There is a large thyroid nodule in the right thyroid gland, which had intense PSMA accumulation. Follicular thyroid lesions can be seen on ⁶⁸Ga-PSMA PET/CT imaging.

The purposes of the present study are to measure the total radiation doses for the radiation workers and for the accompanying person to the patients in positron emission tomography (PET)/computed tomography (CT) imaging. Urines samples from the patients were collected at 43, 62, 87, 117, 238, 362 min after the 555-MBq ¹⁸flour-fluorodeoxyglucose (¹⁸F-FDG) injection and activities were measured. Dose rates were recorded using a Geiger–Muller counter and the total radiation doses were measured with using an electronic personnel dosemeter. According to the results here, 18.4 % of ¹⁸F-FDG was excreted in the urine in 117 min after injection. At 117th min after injection, dose rates were determined as 345, 220, 140, 50 and 15 µSv h⁻¹, at proposed distances. The radiation doses after 117 min were measured as 3.92 mSv at 0.1 m, 2.11 mSv at 0.25 m and 1.08 mSv at 0.5 m. In conclusion, radiation protection will be sufficient within 2 h after ¹⁸F-FDG injection for PET/CT imaging in daily practice.

Uslu-Beşli L, et al. Korean J Radiol. 2020 Jan;21:e3. https://doi.org/10.3348/kjr.2019.0268