Innovative Approaches to Quality Assurance of Tomotherapy Plans Using the «Delta4 Phantom+» Diode Matrix

Modern radiation therapy techniques, such as tomotherapy, despite their high efficacy in oncological practice, carry the risk of dosimetric and technical errors that can affect treatment quality. A key stage in ensuring therapy safety and accuracy is the verification of dosimetric plans to confirm the delivered dose matches the planned values. Various physical and technical methods are used for this purpose, including gamma analysis, which objectively assesses dose distribution accuracy. This study explores the capabilities of the Delta4 solid-state phantom, equipped with a two-dimensional diode detector matrix, for verifying tomotherapy plans delivered with the «Tomotherapy HD» linear accelerator. Dosimetric plan quality was assessed using gamma analysis based on international 3%/3 mm criteria, the standard in intensity-modulated radiation therapy (IMRT). The operational advantages and limitations of the Delta4 phantom were analyzed, including the impact of geometric and dosimetric parameters on measurement accuracy. A correlation was established between the results and the characteristics of treatment plans. Based on the analysis, recommendations are provided to optimize verification processes, along with suggestions for future research to enhance the precision and reliability of quality assurance in radiation therapy.