Abstract
The SRS Technique is a procedure that uses ionizing radiation usually in a single dose or in a maximum number of five fractions for the treatment of intracranial lesions. Multiple brain metastases single-isocenter stereotactic radiosurgery (SRS) treatment is increasingly employed in radiotherapy services. In this treatment is required that the prescription dose be restricted to the lesion only and have a pronounced dose decay in the adjacent healthy tissue. An extensive quality control program must be employed to ensure the quality of the entire treatment procedure. The purpose of this study was to investigate the use of alanine-EPR dosimeters as a dosimetric tool for quality control of the stereotactic radiosurgery procedure using the Volume Modulated Arc Technique (VMAT). The results showed that the alanine-EPR response is linear with the radiation dose in the range from 2 to 100 Gy, with a low dose rate and energy dependencies. The results of the doses measured with alanine in relation to the planned value for the four lesions were concordant, with differences smaller than 1.2%. The experiment enabled a comprehensive assessment of the entire SRS procedure, encompassing both the treatment planning and irradiation phases. Consequently, both mechanical and dosimetric parameters can be evaluated concurrently, allowing for a comprehensive assessment of the total inaccuracy of the procedure.
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