open access

Vol 22, No 6 (2017)
Original research articles
Published online: 2017-11-01
Submitted: 2017-04-11
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Validation of Dosimetric Leaf Gap (DLG) prior to its implementation in Treatment Planning System (TPS): TrueBeam™ millennium 120 leaf MLC

Ravindra Shende, Ganesh Patel
DOI: 10.1016/j.rpor.2017.09.001
·
Rep Pract Oncol Radiother 2017;22(6):485-494.

open access

Vol 22, No 6 (2017)
Original research articles
Published online: 2017-11-01
Submitted: 2017-04-11

Abstract

Aim

Objective of present study is to determine optimum value of DLG and its validation prior to being incorporated in TPS for Varian TrueBeam™ millennium 120 leaves MLC.

Background

Partial transmission through the rounded leaf ends of the Multi Leaf Collimator (MLC) causes a conflict between the edges of the light field and radiation field. Parameter account for this partial transmission is called Dosimetric Leaf Gap (DLG). The complex high precession technique, such as Intensity Modulated Radiation Therapy (IMRT), entails the modeling of optimum value of DLG inside Eclipse Treatment Planning System (TPS) for precise dose calculation.

Materials and methods

Distinct synchronized uniformed extension of sweeping dynamic MLC leaf gap fields created by Varian MLC shaper software were use to determine DLG. DLG measurements performed with both 0.13[[ce:hsp sp="0.25"/]]cc semi-flex ionization chamber and 2D-Array I-Matrix were used to validate the DLG; similarly, values of DLG from TPS were estimated from predicted dose. Similar mathematical approaches were employed to determine DLG from delivered and TPS predicted dose. DLG determined from delivered dose measured with both ionization chamber (DLGIon) and I-Matrix (DLGI-Matrix) compared with DLG estimate from TPS predicted dose (DLGTPS). Measurements were carried out for all available 6MV, 10MV, 15MV, 6MVFFF and 10MVFFF beam energies.

Results

Maximum and minimum DLG deviation between measured and TPS calculated DLG was found to be 0.2[[ce:hsp sp="0.25"/]]mm and 0.1[[ce:hsp sp="0.25"/]]mm, respectively. Both of the measured DLGs (DLGIon and DLGI-Matrix) were found to be in a very good agreement with estimated DLG from TPS (DLGTPS).

Conclusions

Proposed method proved to be helpful in verifying and validating the DLG value prior to its clinical implementation in TPS.

Abstract

Aim

Objective of present study is to determine optimum value of DLG and its validation prior to being incorporated in TPS for Varian TrueBeam™ millennium 120 leaves MLC.

Background

Partial transmission through the rounded leaf ends of the Multi Leaf Collimator (MLC) causes a conflict between the edges of the light field and radiation field. Parameter account for this partial transmission is called Dosimetric Leaf Gap (DLG). The complex high precession technique, such as Intensity Modulated Radiation Therapy (IMRT), entails the modeling of optimum value of DLG inside Eclipse Treatment Planning System (TPS) for precise dose calculation.

Materials and methods

Distinct synchronized uniformed extension of sweeping dynamic MLC leaf gap fields created by Varian MLC shaper software were use to determine DLG. DLG measurements performed with both 0.13[[ce:hsp sp="0.25"/]]cc semi-flex ionization chamber and 2D-Array I-Matrix were used to validate the DLG; similarly, values of DLG from TPS were estimated from predicted dose. Similar mathematical approaches were employed to determine DLG from delivered and TPS predicted dose. DLG determined from delivered dose measured with both ionization chamber (DLGIon) and I-Matrix (DLGI-Matrix) compared with DLG estimate from TPS predicted dose (DLGTPS). Measurements were carried out for all available 6MV, 10MV, 15MV, 6MVFFF and 10MVFFF beam energies.

Results

Maximum and minimum DLG deviation between measured and TPS calculated DLG was found to be 0.2[[ce:hsp sp="0.25"/]]mm and 0.1[[ce:hsp sp="0.25"/]]mm, respectively. Both of the measured DLGs (DLGIon and DLGI-Matrix) were found to be in a very good agreement with estimated DLG from TPS (DLGTPS).

Conclusions

Proposed method proved to be helpful in verifying and validating the DLG value prior to its clinical implementation in TPS.

Get Citation

Keywords

Validation; Dosimetric Leaf Gap; Treatment Planning System; I-Matrix; MLC transmission

About this article
Title

Validation of Dosimetric Leaf Gap (DLG) prior to its implementation in Treatment Planning System (TPS): TrueBeam™ millennium 120 leaf MLC

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 22, No 6 (2017)

Pages

485-494

Published online

2017-11-01

DOI

10.1016/j.rpor.2017.09.001

Bibliographic record

Rep Pract Oncol Radiother 2017;22(6):485-494.

Keywords

Validation
Dosimetric Leaf Gap
Treatment Planning System
I-Matrix
MLC transmission

Authors

Ravindra Shende
Ganesh Patel

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