Iranian Journal of Biomedical Engineering (IJBME)
نشریه علمی مهندسی پزشکی زیستی

Optimization of Matching Adjacent Beam Fields using Mathematical Models in Comparison with the Treatment Planning System

Document Type : Full Research Paper

Authors

Hossein Mirzaei 1
,Ghazale Geraily, 2
Fatemeh Seyyedrezaei 1
Ali Kazemian 3

1 Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

2 Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran / Radiation Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran

3 Radiation Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran

https://doi.org/10.22041/ijbme.2022.544435.1740
Abstract
In radiotherapy treatments, there are some situations where the shape of the target volume is complicated, so multiple radiation fields are used to cover the whole tumoral tissue. Therefore, adjusting adjacent fields and minimizing radiation dose to healthy tissues is an important goal in radiotherapy. The aim of this study is to introduce a general mathematical solution for matching adjacent radiation fields and also to evaluate this solution in therapeutic techniques such as Craniospinal irradiation and breast with a supraclavicular full-field and half-field irradiation. This method considers a right-handed system with its center located in the isocenter and two hypothetical fields named field number one and field number two. Then, the angles of collimators, couch, gantry, and the jaw aperture for both hypothetical fields are calculated to match between their side plates using the presented methods. Comparison of the measurements with the treatment planning system shows that the Craniospinal radiotherapy technique has an error only in measuring the collimator angle; this error is 0.198%. The maximum errors were obtained in two supraclavicular techniques with full- and half-field in calculating the size of the jaw aperture of the supraclavicular field, which were 21.05% and 18.6%, respectively. In conclusion, according to the results, this method can improve the field alignment in all cases where adjacent treatment fields are used, with the acceptable error rate and without changing the field size, to achieve the same dose distribution.

Keywords

Matching Adjacent Fields
Treatment Planning System
Breast Irritation
Breast Supraclavicular Irritation
Cranial Irritation

Subjects

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Iranian Journal of Biomedical Engineering (IJBME)
Volume 16, Issue 1
Spring 2022
Pages 23-32

  • Receive Date 15 December 2021
  • Revise Date 16 May 2022
  • Accept Date 08 June 2022

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