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Evaluation of whole body dose reduction by modified injection technique.

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

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Evaluation of whole body dose reduction by modified injection technique.

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  1. 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

  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

  4. 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

  5. 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

  6. 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 )

  7. Activity administration Old technique New technique

  8. Old technique

  9. New technique

  10. Results

  11. Results mSv staff

  12. 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

  13. 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

  14. Activity administration Old technique New technique

  15. Whole body doses • No of clincal scans done in 2006/07 - 3248 2007/08 - 3551

  16. Other methods to reduce WBD

  17. WBD Distribution

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