open access

Vol 21, No 3 (2016)
Original research articles
Published online: 2016-05-01
Submitted: 2015-01-18
Get Citation

Determination of boundaries between ranges of high and low gradient of beam profile

Jacek Wendykier, Marcin Bieniasiewicz, Aleksandra Grządziel, Tadeusz Jedynak, Wiktor Kośniewski, Marta Reudelsdorf, Piotr Wendykier
DOI: 10.1016/j.rpor.2015.12.007
·
Rep Pract Oncol Radiother 2016;21(3):168-173.

open access

Vol 21, No 3 (2016)
Original research articles
Published online: 2016-05-01
Submitted: 2015-01-18

Abstract

Aim

This work addresses the problem of treatment planning system commissioning by introducing a new method of determination of boundaries between high and low gradient in beam profile.

Background

The commissioning of a treatment planning system is a very important task in the radiation therapy. One of the main goals of this task is to compare two field profiles: measured and calculated. Applying points of 80% and 120% of nominal field size can lead to the incorrect determination of boundaries, especially for small field sizes.

Materials and methods

The method that is based on the beam profile gradient allows for proper assignment of boundaries between high and low gradient regions even for small fields. TRS 430 recommendations for commissioning were used.

Results

The described method allows a separation between high and low gradient, because it directly uses the value of the gradient of a profile. For small fields, the boundaries determined by the new method allow a commissioning of a treatment planning system according to the TRS 430, while the point of 80% of nominal field size is already in the high gradient region.

Conclusions

The method of determining the boundaries by using the beam profile gradient can be extremely helpful during the commissioning of the treatment planning system for Intensity Modulated Radiation Therapy or for other techniques which require very small field sizes.

Abstract

Aim

This work addresses the problem of treatment planning system commissioning by introducing a new method of determination of boundaries between high and low gradient in beam profile.

Background

The commissioning of a treatment planning system is a very important task in the radiation therapy. One of the main goals of this task is to compare two field profiles: measured and calculated. Applying points of 80% and 120% of nominal field size can lead to the incorrect determination of boundaries, especially for small field sizes.

Materials and methods

The method that is based on the beam profile gradient allows for proper assignment of boundaries between high and low gradient regions even for small fields. TRS 430 recommendations for commissioning were used.

Results

The described method allows a separation between high and low gradient, because it directly uses the value of the gradient of a profile. For small fields, the boundaries determined by the new method allow a commissioning of a treatment planning system according to the TRS 430, while the point of 80% of nominal field size is already in the high gradient region.

Conclusions

The method of determining the boundaries by using the beam profile gradient can be extremely helpful during the commissioning of the treatment planning system for Intensity Modulated Radiation Therapy or for other techniques which require very small field sizes.

Get Citation

Keywords

TPS commissioning; Beam profile; Dose gradient

About this article
Title

Determination of boundaries between ranges of high and low gradient of beam profile

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 21, No 3 (2016)

Pages

168-173

Published online

2016-05-01

DOI

10.1016/j.rpor.2015.12.007

Bibliographic record

Rep Pract Oncol Radiother 2016;21(3):168-173.

Keywords

TPS commissioning
Beam profile
Dose gradient

Authors

Jacek Wendykier
Marcin Bieniasiewicz
Aleksandra Grządziel
Tadeusz Jedynak
Wiktor Kośniewski
Marta Reudelsdorf
Piotr Wendykier

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