LQL-Equiv – Open-Source Software for Biologically Equivalent Dose Computation in Radiotherapy LQL-Equiv** is a standalone scientific software designed to compute biologically equivalent doses (BED and EQD2) in external beam radiotherapy. It is based on the Linear Quadratic Linear (LQL) model, and includes corrections for time factors such as repair, repopulation, and protraction. This tool is intended for radiation oncologists, medical physicists, researchers, and educators. It is currently used in over 20 countries. --- Download You can download the latest version of LQL-Equiv at: https://cloud.minesparis.psl.eu/index.php/s/blUizdZ6834RgRs Scientific Publications Using LQL-Equiv The software has been used or referenced in several peer-reviewed studies, including: -Voyant C. et al. (2025) Clinical Oncology – “Automatic calculation of biological equivalent doses with LQL models: clinical applications” https://doi.org/10.1016/j.clon.2025.103893 Voyant C. & Julian D., (2017)* *arXiv preprint* – “On the LQL model: revisiting linear-quadratic approaches for radiotherapy” https://arxiv.org/pdf/1704.06457 - Voyant C. et al. (2016) *Reports of Practical Oncology and Radiotherapy* – “A graphical tool to compute and visualize BED/EQD2 doses” https://journals.viamedica.pl/rpor/article/download/73509/53599--- Authors - Cyril Voyant – Mines Paris – PSL - Daniel Julian – Centre de Cancérologie du Grand Montpellier --- Keywords `Radiotherapy` `BED` `EQD2` `LQL model` `Radiobiology` `Medical Physics` `Dose Equivalence` `Open-source` --- License This software is governed by the CeCILL license under French law and abiding by the rules of distribution of free software. You can use, modify and/or redistribute the software under the terms of the CeCILL license as circulated by CEA, CNRS and INRIA at the following URL: http://www.cecill.info.

LQL-Equiv has been developed by Cyril Voyant and Daniel Julian, combining expertise in radiotherapy modeling and software design. The tool aims to support clinical decision-making and academic research in radiation oncology. It is currently used in over 20 countries worldwide. The latest version of LQL-Equiv is also available at https://cloud.minesparis.psl.eu/index.php/s/blUizdZ6834RgRs Source Code and Development; LQL-Equiv is developed and maintained on GitHub https://github.com/cyrilvoyant/LQ-Equiv