Staff dose at different stages of ¹⁸F-FDG PET/CT scanning procedures in a typical PET/CT centre

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Staff dose at different stages of ¹⁸F-FDG PET/CT scanning procedures in a typical PET/CT centre

 

Author: Ho, Kin-sing
Title: Staff dose at different stages of ¹⁸F-FDG PET/CT scanning procedures in a typical PET/CT centre
Degree: M.Sc.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Tomography, Emission
Radiation dosimetry
Department: Dept. of Health Technology and Informatics
Pages: xiv, 83 leaves : ill. (some col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2396360
URI: http://theses.lib.polyu.edu.hk/handle/200/5949
Abstract: The demand for the ¹⁸F-FDG PET/CT clinical examination is increasing all over the world. The handling of the high energy (511 keV) gamma emitting radiopharmaceutical and interaction with patient after the injection of ¹⁸F-FDG could result in a relatively high radiation dose received by staff. This research was carried out so as to investigate the radiation dose to staff members at different stages of ¹⁸F-FDG PET/CT scanning procedure in a dedicated PET/CT center. This study was perfonned at PET/CT center of the University of Hong Kong with the use of the GE Discovery VCT PET/CT scanner. High sensitivity thennoluminescent dosemeters (TLD pellets of LiF:Mg,Cu,P) were used for dose measurements. These TLDs were calibrated and read using an ionization chamber system (Radcal mdh 2025). The TLD Reader (Rialto NE Technology) and Toshiba general purpose X-ray unit which are installed at the Hong Kong Polytechnic University. The following measurements were made including 1) daily integral dose of each staff at 5 different body levels: eye, thyroid, gonad, finger and body; 2) dose to staff members at different stages of ¹⁸F-FDG PET/CT scanning procedures; 3) patient emission dose rate and 4) the effectiveness of the use of lead apron in reducing the staff dose. Results show that the mean daily dose received by each staff was approximately 12.39 uSv and the mean daily dose per MBq injected was about 0.02 uSv. Except gonad and body region, statistical test suggested that there was no statistically significant difference among the dose received at eye, thyroid and body. About 66% of the staff dose resulted from stage 2, 3 and 4 which were close contact with patient during uptake period, patient positioning and releasing patient from the scanner respectively. Nearly all the patient emission dose rate measurement showed the trend of exponential decay with time and distance. The result also shows that the 1.5 mm lead equivalent apron can only reduce less than 1 % of the occupational radiation dose which implies that it is not a desirable radiation protection device for staff. On the other hand, the syringe shield or remote control facility could minimize the staff dose in a good extent.

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