open access

Vol 20, No 4 (2015)
Original research articles
Published online: 2015-07-01
Submitted: 2014-06-11
Get Citation

Relationships between various indices of doses distribution homogeneity

Marzena Mrozowska, Paweł Kukołowicz
DOI: 10.1016/j.rpor.2015.03.007
·
Rep Pract Oncol Radiother 2015;20(4):278-283.

open access

Vol 20, No 4 (2015)
Original research articles
Published online: 2015-07-01
Submitted: 2014-06-11

Abstract

Aim

In this study we compared three different methods of evaluation of dose distribution.

Background

The aim of treatment planning is to prepare the treatment plan which the criteria are defined according to the international recommendations.

Materials and methods

For three groups of patients, for lung, breast and prostate, treated radically in Brzozow with external beams the treatment plans were prepared. For each patient the metrics of dose distribution in the PTV defined according to the ICRU Reports 50, 83 and according to the Nordic Association of Clinical were calculated. Also Homogeneity Index defined by Yoon was used in this work. Additionally for similar group of patients treated in Warsaw the same calculations were performed. Correlations between the standard deviations and: (1) the differences between the maximum and minimum doses, and (2) the differences between near maximum and near minimum doses normalized to median dose and (3) to prescribed dose were calculated.

Results

There was a very strong correlation between the standard deviation and the difference between the near-maximum and near-minimum doses for all locations regardless the prescription. Also good correlation was observed for the standard deviation and the difference between the maximum and minimum doses for patients treated in Brzozow.

Conclusions

The standard deviation may be estimated by the Homogeneity Index, however the relationship should be established for each location and each center separately.

Abstract

Aim

In this study we compared three different methods of evaluation of dose distribution.

Background

The aim of treatment planning is to prepare the treatment plan which the criteria are defined according to the international recommendations.

Materials and methods

For three groups of patients, for lung, breast and prostate, treated radically in Brzozow with external beams the treatment plans were prepared. For each patient the metrics of dose distribution in the PTV defined according to the ICRU Reports 50, 83 and according to the Nordic Association of Clinical were calculated. Also Homogeneity Index defined by Yoon was used in this work. Additionally for similar group of patients treated in Warsaw the same calculations were performed. Correlations between the standard deviations and: (1) the differences between the maximum and minimum doses, and (2) the differences between near maximum and near minimum doses normalized to median dose and (3) to prescribed dose were calculated.

Results

There was a very strong correlation between the standard deviation and the difference between the near-maximum and near-minimum doses for all locations regardless the prescription. Also good correlation was observed for the standard deviation and the difference between the maximum and minimum doses for patients treated in Brzozow.

Conclusions

The standard deviation may be estimated by the Homogeneity Index, however the relationship should be established for each location and each center separately.

Get Citation

Keywords

ICRU Report 50; ICRU Report 83; Nordic Association of Clinical Physics Report; Doses distribution homogeneity

About this article
Title

Relationships between various indices of doses distribution homogeneity

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 20, No 4 (2015)

Pages

278-283

Published online

2015-07-01

DOI

10.1016/j.rpor.2015.03.007

Bibliographic record

Rep Pract Oncol Radiother 2015;20(4):278-283.

Keywords

ICRU Report 50
ICRU Report 83
Nordic Association of Clinical Physics Report
Doses distribution homogeneity

Authors

Marzena Mrozowska
Paweł Kukołowicz

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: journals@viamedica.pl