Abstract
Purpose: To investigate and compare two polymer gel dosimeters, Magic and Pagatug, as organ dosimeters for 3D measurement of dose distribution in brachytherapy, nuclear medicine and teletherapy. Methods: Magic and Pagatug polymer gels were compared with soft tissue based on irradiation with low energy photons during therapeutic applications. Comparison was simulated using Monte-Carlobased MCNPX code. ORNL phantom–Female was used to model some vital organs (kidneys, ovaries and uterus). The right kidney was proposed to be the source of irradiation and the two organs were exposed to this irradiation. Results : The effective atomic numbers of soft tissue, Magic and Pagatug were 6.86134, 7.07 and 7.2884, respectively. The results showed that Magic and Pagatug, were comparable to soft tissue with regard to application in nuclear medicine and teletherapy. Differences between gel dosimeters and soft tissue were defined as the dose responses. This difference was < 8.1, < 4 and < 76.8 % for teletherapy, nuclear medicine and brachytherapy, respectively. Conclusion: Due to slight differences between the effective atomic numbers of these polymer gel dosimeters and soft tissue, the polymer gels are not suitable for brachytherapy since the photoelectric interaction is dominant for low energy photons, and the interaction relates to Z4. The results demonstrate that the gel dosimeters are best suited for nuclear medicine. Keywords : Magic, Pagatug, Brachytherapy, Nuclear medicine, Teletherapy, Organ dosimetry, Soft tissue
Highlights
There are several dosimetry techniques used to determine the distribution of radiation dose during radiation treatment
The source positions are placed in the kidneys in brachytherapy, and the kidneys are radiated in nuclear medicine and teletherapy
Outputs of simulations were determined for polymer gel dosimeters and soft tissue during brachytherapy, nuclear medicine and teletherapy, and the results are shown in Table 3 and Table 4
Summary
There are several dosimetry techniques used to determine the distribution of radiation dose during radiation treatment. There are several different scans in nuclear medicine applications, of which heart scans are the most common In these scans, the kidneys absorb the highest amount of dose as well as some other critical organs such as ovaries and uterus [5]. Polymer gel dosimeter can replace medical phantom materials as media with features similar to soft tissue. This type of dosimeter can be considered as a suitable option for studying dose distribution in sensitive organs during radiation therapy and nuclear medicine. In the present study, the capabilities of polymer gel dosimeters, Magic and Pagatug as medical phantoms for evaluating absorbed dose of radiation in the ovaries and uterus from the right kidney during brachytherapy, nuclear medicine and teletherapy were investigated. WC: percentage weight of carbon in composition; WH: percentage weight of hydrogen in composition; WN: percentage weight of nitrogen in composition; WO: percentage weight of oxygen in composition; WS: percentage weight of sulphur in composition; WCu: percentage weight of copper in composition
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