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Dosimetric Uncertainty of Tc-99m On Gamma Camera Scanning: A Single Institute Review

J Chow

U Khalid1 , M Khan1 , J Rehman2 , T Iqbal1 , S Ali3 , J Chow4*, (1) University of Gujrat, Gujrat, Pakistan, (2) BUITEMS, Baleli, Pakistan, (3) Gujranwala Institute of Nuclear Medicine & Radiotherapy, Gurjranwala, Pakistan, (4) Princess Margaret Cancer Centre, Toronto, ON


TU-C3-GePD-IT-2 (Tuesday, August 1, 2017) 10:30 AM - 11:00 AM Room: Imaging ePoster Theater

Purpose: Tc-99m is a radioactive isotope that is eluted from a 99Mo/Tc-99m generator (PINSTECH, Islamabad) and used for the purposes of radionuclide scanning. The objective of this work is to study the uncertainties in Tc-99m activity related to the measurement of post-injection time when a gamma camera was used for scanning.
Methods: Lead canisters were used for storing the elution vials and a dose calibrator was used for measuring the Tc-99m dose activity. Our study comprises of one thyroid patient, 38 bone patients, 5 renal patients and 45 cardiac patients out of each 50 patients in which activity uncertainty was calculated.
Results: After comparing the measured data with the standard value of dose activity that was acceptable at the international level, 2% thyroid, 76% bone and 10% renal patients’ uncertainties in activity were calculated. Almost 90% of the cardiac patients were calculated, making it the largest group calculated.
Conclusion: It is concluded that uncertainty in activity is due to uncertainty in the time delay between the injection preparation time and the injection time, as well as the residual radionuclide that is not injected into patients and remains in the syringe.

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