Evaluation and validation of IBA I'MatriXX array for patient-specific quality assurance of tomotherapy

• Published in: Journal of medical physics Vol. 44; no. 3; pp. 222 - 227
• Main Authors: Madhusudhana Sresty, N, Raju, A, Reddy, B, Sahithya, V, Mohmd, Yakub, Kumar, G, Kumar, T, Rushdi, Tasneem, Aparna, S, Prasad, G, Bajwa, Harjot
• Format: Journal Article
• Language: English
• Published: Mumbai Wolters Kluwer India Pvt. Ltd 01-07-2019; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Wolters Kluwer - Medknow; Wolters Kluwer Medknow Publications
• Subjects: Arrays; Cancer therapies; Dosimetry; Fractionation; Intensity-modulated radiation therapy; Planning; Quality assurance; Quality control; Radiation (Physics); Radiation therapy; Radiotherapy; Schedules; Sensors; Software; Technical Note; TomoTherapy; TomoTherapy; Intensity-modulated radiation therapy; quality assurance
• ISSN: 0971-6203; 1998-3913
• DOI: 10.4103/jmp.JMP_11_19

TomoTherapy® is a modern radiation treatment technique in which intensity-modulated radiation therapy (IMRT) is delivered in helical fashion. A two-dimensional (2D) array which has been existing for IMRT patient-specific quality assurance (PSQA) verifications for many years is I'MatriXX. Our objectives were to validate this I'MatriXX and to evaluate it for different patient sites and fractionation schedules of TomoTherapy treatment. Twenty-five plans were created with virtual target for different possible pitch values and field widths for validation. Gamma index criteria of 3%/2% dose differences and 3/2 mm distance to agreement were used. QA plans of 26 different treatment sites and different fractionation schedules were used. Results indicated that the matrix response is independent of field width, pitch, and modulation factor of TomoTherapy with 3%, 3 mm criteria. High passing rate ranging from 99.7% to 90.7% was observed for selected patient plans. We found that I'MatriXX 2D array can be utilized for easy and quick TomoTherapy PSQA.