open access

Vol 24, No 1 (2019)
Original research articles
Published online: 2019-01-01
Submitted: 2017-08-29
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IMRT/VMAT dose distributions generated for and collimators and accelerators

Krzysztof Ślosarek, Iwona Brąclik, Wojciech Leszczyński, Joanna Kopczyńska, Wojciech Osewski, Jacek Wendykier
DOI: 10.1016/j.rpor.2018.09.001
·
Rep Pract Oncol Radiother 2019;24(1):20-27.

open access

Vol 24, No 1 (2019)
Original research articles
Published online: 2019-01-01
Submitted: 2017-08-29

Abstract

Aim

The aim of this study is to answer the question whether the calculated dose distributions for HD and Millennium collimators (Varian Medical Systems) are equivalent for large treatment volumes.

Background

Modern biomedical linacs are equipped with multileaf collimators where leaves can be of different widths. Thinner leaves allow better fit to desired (tumor) shape. At the same time, however, the maximum size of the field that can be obtained with the collimator is also reduced. Varian Medical Systems HD and Millennium collimators can be a good sample. They have 40cm or 22cm×40cm maximal field size at the isocenter, respectively.

Materials and methods

This paper presents the comparison of selected statistical and dosimetric parameters achieved for treatment plans where the beams for a HD collimator had to be merged because of the size of the tumor volume.

Results and discussion

Achieved results show that, independently from irradiated volume, there is no statistically significant difference for calculated dose distributions, integral doses, MU values and coefficients evaluating dose distributions for HD and Millennium collimators.

Conclusions

Results show that both types of collimators can be used interchangeably for preparing the treatment plans for large tumor volume without quality reduction of the prepared treatment plan.

Abstract

Aim

The aim of this study is to answer the question whether the calculated dose distributions for HD and Millennium collimators (Varian Medical Systems) are equivalent for large treatment volumes.

Background

Modern biomedical linacs are equipped with multileaf collimators where leaves can be of different widths. Thinner leaves allow better fit to desired (tumor) shape. At the same time, however, the maximum size of the field that can be obtained with the collimator is also reduced. Varian Medical Systems HD and Millennium collimators can be a good sample. They have 40cm or 22cm×40cm maximal field size at the isocenter, respectively.

Materials and methods

This paper presents the comparison of selected statistical and dosimetric parameters achieved for treatment plans where the beams for a HD collimator had to be merged because of the size of the tumor volume.

Results and discussion

Achieved results show that, independently from irradiated volume, there is no statistically significant difference for calculated dose distributions, integral doses, MU values and coefficients evaluating dose distributions for HD and Millennium collimators.

Conclusions

Results show that both types of collimators can be used interchangeably for preparing the treatment plans for large tumor volume without quality reduction of the prepared treatment plan.

Get Citation

Keywords

Multileaf collimators HD; Millennium; Dose distribution; Statistical nonparametric test

About this article
Title

IMRT/VMAT dose distributions generated for and collimators and accelerators

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 1 (2019)

Pages

20-27

Published online

2019-01-01

DOI

10.1016/j.rpor.2018.09.001

Bibliographic record

Rep Pract Oncol Radiother 2019;24(1):20-27.

Keywords

Multileaf collimators HD
Millennium
Dose distribution
Statistical nonparametric test

Authors

Krzysztof Ślosarek
Iwona Brąclik
Wojciech Leszczyński
Joanna Kopczyńska
Wojciech Osewski
Jacek Wendykier

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