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A linear source table to determine the treatment times for cylindrical applicators used in high-dose rate brachytherapy.

Abstract：

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.

journal_name

Brachytherapy

journal_title

Brachytherapy

authors

Sha RL,Reddy PY,Sahoo N

doi

10.1016/j.brachy.2010.08.010

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

249-52

issue

3

eissn

1538-4721

issn

1873-1449

pii

S1538-4721(10)00308-9

journal_volume

10

pub_type

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