|
Physical aspects of skin dose distribution in tomotherapy of breast cancer
|
P. Saadatmand   , S.R. Mahdavi , A. Nikoofar , G. Esmaili , M. Jalilifar , S. Khazaie , S. Vejdani |
| Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran , srmahdavi@hotmail.com |
|
|
Abstract: (178 Views) |
Background: Estimating the accuracy of Treatment Planning Systems (TPS) in skin dose calculation is essential to achieving the intended therapeutic outcomes in breast cancer radiotherapy. This study aims to validate tomotherapy TPS accuracy in skin dose estimation. Materials and Methods: The ability of Accuray Precision TPS to provide precise skin dose calculations was examined by utilizing the Gafchromic EBT3 film, which was placed on the surface of the cylinder Delta4 phantom. The target volume received a 2Gy dose following setup validation. The accuracy of TPS was assessed using distinct spatial resolutions for dose calculation in helical and direct Tomotherapy plans. Using the RIT software, gamma analysis was employed to evaluate the precision of TPS skin dose distribution relative to the EBT3 film. Results: Comparison of skin dose distribution between the TPS and EBT3 films demonstrated acceptable gamma passing rates for helical (up to 98.51%) and direct plan (up to 90.41%) using gamma index criteria of 5 mm/5%. However, the gamma index of helical and direct tomotherapy plans with passing criteria of 3 mm/3% was 84.15% and 79.12%, respectively. Our findings indicate satisfactory consistency (3-5%) between measured and calculated skin doses using the EBT3 film and TPS, employing "high" spatial resolution dose calculation in helical and direct Tomotherapy plans. Conclusion: The reliability of the tomotherapy TPS in skin dose calculation is maintained by utilizing high spatial resolution for dose computation. The accuracy of TPS validated against the Gafchoromic EBT3 film was within an acceptable gamma-passing rate. |
|
| Keywords: Tomotherapy, intensity-modulated radiotherapy, skin dose, breast cancer. |
|
|
Full-Text [PDF 1281 kb]
(36 Downloads)
|
|
Type of Study: Original Research |
Subject:
Radiation Biology
|
|
|
|
|
|
|
| Send email to the article author |
|
|
|
| Add your comments about this article |
|
|
|
