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- Title
Assessment of accuracy of out-of-field dose calculations by TiGRT treatment planning system in radiotherapy.
- Authors
Bahreyni Toossi, Mohammad; Soleymanifard, Shokouhozaman; Farhood, Bagher; Mohebbi, Shokoufeh; Davenport, David; Bahreyni Toossi, Mohammad Taghi
- Abstract
<bold>Aim: </bold>The objective was to quantify the accuracy of dose calculation for out-of-field regions by the commercially available TiGRT version 1.2 (LinaTech, Sunnyvale, CA, USA) treatment planning system (TPS) for a clinical treatment delivered on a Siemens Primus with the single energy of 6 MV.<bold>Materials and Methods: </bold>Two tangential open fields were planned by TiGRT TPS to irradiate the left breast of a RANDO phantom. Dose values to out-of-field points were calculated by TiGRT TPS. A RANDO phantom was then irradiated, and dose values at set points were measured using thermoluminescent detectors-100 (TLDs-100) which were located within the phantom. Finally, the TLD-measured dose was compared to the TPS-calculated dose and the accuracy of TPS calculations at different distances from the field edge was quantified.<bold>Results: </bold>The measurements showed that TiGRT TPS generally underestimated the dose of out-of-field points and this underestimation worsened for regions relatively close to the treatment field edge. The mean underestimation of out-of-field doses was 39%. Nevertheless, the accuracy of dose calculation by this TPS for most in-field regions was within tolerance.<bold>Conclusion: </bold>This study highlights the limitations of TiGRT TPSs in calculating of the out-of-field dose. It should be noted that out-of-field data for this TPS should only be applied with a certain understanding of the accuracy of calculated dose outside the treatment field. Therefore, using the TPS-calculated dose could lead to an underestimation of secondary cancer risk as well as a weak clinical decision for patients with implantable cardiac pacemakers or pregnant patients.
- Subjects
RADIOTHERAPY; CANCER patients; ELECTROTHERAPEUTICS; DRUG administration; ALGORITHMS; BREAST tumors; COMPUTERS in medicine; IMAGING phantoms; RADIATION doses; RADIATION measurements
- Publication
Journal of Cancer Research & Therapeutics, 2018, Vol 14, Issue 3, p634
- ISSN
0973-1482
- Publication type
journal article
- DOI
10.4103/0973-1482.176423