Evaluation of whole body dose reduction by modified injection technique
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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 injection technique.

  • 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 injection technique.

  • 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 injection technique.

  • 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 & injection technique.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 injection technique.

Old technique

New technique


Old technique
Old technique injection technique.


New technique
New technique injection technique.


Results
Results injection technique.


Results1
Results injection technique.

mSv

staff


Results2
Results injection technique.

  • 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 injection technique.

  • 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 injection technique.

Old technique

New technique


Whole body doses
Whole body doses injection technique.

  • No of clincal scans done in 2006/07 - 3248

    2007/08 - 3551


Other methods to reduce wbd
Other methods to reduce WBD injection technique.


Wbd distribution
WBD Distribution injection technique.


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