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This study evaluates the impact of a modified injection technique on reducing staff whole-body radiation dose during F-18-FDG administration in PET imaging. The results show a significant decrease in staff radiation exposure with the new technique, allowing for increased patient throughput while maintaining safety standards. The study, conducted at St. Thomas' Hospital, highlights the importance of implementing cost-effective strategies to minimize radiation risks in medical imaging procedures.
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Evaluation of whole body dose reduction by modified injection technique. Joemon John PET Imaging Centre Guy’s, King’s & St.Thomas’ School of Medicine King’s College London
Evaluation of whole body dose reduction by modified injection technique. • BACKGROUND • MATERIALS & METHODS • RESULTS • CONCLUSION
PET Imaging at St Thomas’ Hospital • Facilities two dedicated PET/CT scanners on-site cyclotron radiochemistry production laboratory • Scanning activity clinical & research scanning – 3,500 patient scans per annum oncology, cardiology & neurology 5 dedicated PET/CT scanning technologists / radiographers
Radiation Protection Issues • Increase in patient throughput with PET/CT scanning raised concerns about staff whole body radiation dose • Imaging staff receive radiation when handling radioactivity & interaction with patients • 65 % of staff WBD received when administering radiopharmaceutical activity to the patient
Purpose of the study • To improve the method of F-18 FDG administration • To evaluate a modified injection technique for reducing staff WBD • To compare WBD received during the time of administration by comparing the two different techniques
Materials & Methods • Personnel involved 5 technologists 120 ambulatory clinical patients • Devices syringe holders lead shields dose monitor(Atomtex) extension tubing ( 30cm long, 1mm ID, 2mm OD )
Activity administration Old technique New technique
Results mSv staff
Results • Mean WBD received during administration: old technique was 0.64 – 1.9 mSv new technique was 0.39 – 0.94 mSv • Other factor affecting WBD: speed of administration
Conclusion • Simple technique • Cost effective - less than £1 per patient increase • Significant reduction in staff WBD • Increased patient throughput per day whilst remaining within staff dose limits
Activity administration Old technique New technique
Whole body doses • No of clincal scans done in 2006/07 - 3248 2007/08 - 3551