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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

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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 technique1
Evaluation of whole body dose reduction by modified injection technique.
  • BACKGROUND
  • MATERIALS & METHODS
  • RESULTS
  • CONCLUSION
pet imaging at st thomas hospital
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
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
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
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
Activity administration

Old technique

New technique

results1
Results

mSv

staff

results2
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
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 administration1
Activity administration

Old technique

New technique

whole body doses
Whole body doses
  • No of clincal scans done in 2006/07 - 3248

2007/08 - 3551

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