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A linear source table to determine the treatment times for cylindrical applicators used in high-dose rate
Rajib Lochan Sha1, Palreddy Yadagiri Reddy, Narayan Sahoo
1Department of Radiation Physics, The Indo-American Cancer Institute & Research Centre, Banjara Hills, Hyderabad, India. rajibsha@gmail.com
Purpose:
It is a good practice for quality assurance purposes to check the high-dose rate brachytherapy source dwell times obtained from any computerized treatment planning system (TPS) by independent hand calculations. The aim of this work was to prepare a table that would help to calculate the total dwell times for cylindrical applicators used for high-dose rate brachytherapy.
Methods And Materials:
The results of an earlier investigation of dose rate per unit source strength at different distances from the microSelectron-high-dose rate (192)Ir source and the relative weights for dwell times obtained from optimized plans were used to prepare a linear source table.
Results:
This table gives the product of source strength and total dwell times to deliver 1000 cGy at various distances for active lengths ranging from 1 to 8 cm and for treatment distances of 1 to 2.25 cm. One can use this table to determine the total dwell time necessary to deliver the prescribed dose at a specific distance for the source strength at the time of treatment. This can be compared with the total dwell time calculated by the computerized TPS.
Conclusion:
The linear source table makes the determination of total dwell time very easy and would help the clinical physicist to check the accuracy of results of the TPS quickly.
