| 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: | Department of Health Technology and Informatics |
| Pages: | xiv, 83 leaves : ill. (some col.) ; 30 cm. |
| Language: | English |
| 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. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b23963608.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.57 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/5949