Abstract
Due to the complexity and the many steps involved in a high dose rate brachytherapy process, radiation dose delivered to the patient during the treatment is susceptible to many inaccuracies and may not accurately match the planned dose. In vivo dosimetry is a reliable solution to compare planned and delivered dose distributions, representing therefore a valid tool to systematically perform a quality control of the radiotherapic process and eventually increment treatment accuracy. In this study, Fricke gel dosimetric catheters (FGDC) were investigated to perform dose distribution measurements of a brachytherapy implant. The brachytherapy implant was established in a water phantom with five flexible plastic needles and irradiation was performed with a high dose rate remote afterloading device provided with an Ir-192 radioactive source. Comparison between dose distributions measured with ten FGDC located in the proximity of the implant needles and calculated by the treatment planning system shows very good agreement for seven out of ten dosimeters, whereas the remaining three show a local underestimation of the dose. In phantom results indicate that Fricke gel dosimetric catheters might be valid candidates for performing in vivo dosimetry in high dose rate brachytherapy. However, further measurements are still required to validate this dosimetric method.
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