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Joemon John PET Imaging Centre Guys, Kings & St.Thomas School of Medicine Kings College London.

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Presentation on theme: "Joemon John PET Imaging Centre Guys, Kings & St.Thomas School of Medicine Kings College London."— Presentation transcript:

1 Joemon John PET Imaging Centre Guys, Kings & St.Thomas School of Medicine Kings College London

2 Evaluation of whole body dose reduction by modified injection technique. BACKGROUND MATERIALS & METHODS RESULTS CONCLUSION

3 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

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5 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 Staff Dose in Sv injecting Total Dose in Sv % from injecting A % B % C % D % E %

6 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

7 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 )

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9 Activity administration Old technique New technique

10 Old technique

11 New technique

12 Results Staff member Doses in Sv (old technique) Doses in Sv (new technique) Difference A % B % C % D % E %

13 Results staff Sv

14 Results Mean WBD received during administration: old technique was 0.64 – 1.9 Sv new technique was 0.39 – 0.94 Sv Other factor affecting WBD: speed of administration

15 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

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17 Activity administration Old technique New technique

18 Whole body doses No of clincal scans done in 2006/ /

19 Other methods to reduce WBD

20 WBD Distribution


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