evaluation of whole body dose reduction by modified injection technique
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Evaluation of whole body dose reduction by modified injection technique.
Joemon JohnPET Imaging CentreGuy’s, King’s & St.Thomas’ School of MedicineKing’s College London
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Evaluation of whole body dose reduction by modified injection technique.BACKGROUNDMATERIALS & METHODSRESULTSCONCLUSION
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PET Imaging at St Thomas’ HospitalFacilities
two dedicated PET/CT scannerson-site cyclotronradiochemistry production laboratory
Scanning activityclinical & research scanning – 3,500 patient scans
per annumoncology, cardiology & neurology5 dedicated PET/CT scanning technologists /
radiographers
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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 mSv injecting
Total Dose in mSv
% from injecting
A 0.5 0.78 64%B 0.33 0.58 56%C 0.7 1.0 70%D 0.93 1.35 68%E 1.0 1.55 64%
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Purpose of the studyTo improve the method of F-18 FDG
administration To evaluate a modified injection technique for
reducing staff WBDTo compare WBD received during the time of
administration by comparing the two different techniques
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Materials & MethodsPersonnel involved
5 technologists120 ambulatory clinical patients
Devicessyringe holders lead shieldsdose monitor(Atomtex)extension tubing ( 30cm long, 1mm ID,
2mm OD )
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Activity administrationOld technique New technique
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Old technique
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New technique
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ResultsStaff member Doses in mSv
(old technique)
Doses in mSv(new technique)
Difference
A 1.07 0.63 40%B 0.64 0.39 39%C 1.5 0.94 38%D 1.76 0.67 36%E 0.65 0.5 28%
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Results
A B C D E0
0.20.40.60.8
11.21.41.61.8
2
OLDNEW
staff
mSv
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ResultsMean WBD received during administration:
old technique was 0.64 – 1.9 mSvnew technique was 0.39 – 0.94 mSv
Other factor affecting WBD:speed of administration
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ConclusionSimple techniqueCost effective - less than £1 per patient
increaseSignificant reduction in staff WBDIncreased patient throughput per day whilst
remaining within staff dose limits
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Activity administrationOld technique New technique
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Whole body dosesNo of clincal scans
done in 2006/07 - 3248
2007/08 - 3551
A B C D0
0.5
1
1.5
2
2.5
2006/072007/08
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Other methods to reduce WBD
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WBD Distribution5%
65%
7%
14%
10%
Drawing upAdministrationPatient changeScanner onScanner off