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<!doctype html>
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    <title>About | Open TOPAS</title>
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          <a class="logo-mark" href="index.html" aria-label="Open TOPAS home">
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          <a href="about.html" aria-current="page">About</a>
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    <main>
      <section class="content-placeholder section-inner" aria-labelledby="about-overview">
        <h2 id="about-overview">What is OpenTOPAS?</h2>
        <article class="stat-card overview-card">
          <div class="text-columns">
            <p>
              The NIH-funded TOPAS project made radiation therapy simulations using the Monte Carlo method easily
              accessible for the radiotherapy community. This repository brings the code to a new, truly open
              release stage called <strong>OpenTOPAS</strong>.
            </p>
            <p>
              OpenTOPAS wraps and extends the <a href="https://geant4.web.cern.ch" target="_blank" rel="noopener">Geant4 Simulation Toolkit</a>
              to provide an easier-to-use application for the medical physicist. The parameter control system lets physicists assemble and control a rich
              library of simulation objects—geometry components, particle sources, scorers—without writing C++ or knowing Geant4 internals.
              Visit the <a href="https://opentopas.readthedocs.io/en/latest" target="_blank" rel="noopener">User Guide</a> for deeper dives.
            </p>
            <p>
              The project was originally created out of an NIH-funded collaboration of Massachusetts General Hospital,
              University of California San Francisco, and SLAC National Accelerator Laboratory. Today, the UCSF and MGH teams continue
              to maintain and expand OpenTOPAS in partnership with the Monte Carlo community.
            </p>
            <p>
              OpenTOPAS supports simulation of medical applications of ionizing radiation with the Monte Carlo method.
              Free availability is intended to aid research by medical physicists, radiobiologists, and clinicians across all radiotherapy modalities.
              New users should review the key publications to explore its potential.
            </p>
          </div>
        </article>

        <div class="stat-grid">
          <article class="stat-card">
            <h3>Mission</h3>
            <p>
              Deliver a validated, community-supported Monte Carlo framework that enables accurate and efficient radiation therapy research.
            </p>
          </article>
          <article class="stat-card">
            <h3>Why Open</h3>
            <p>
              Full open access allows advanced users to extend the platform in C++ while benefiting from the OpenTOPAS parameter system and Geant4 flexibility.
            </p>
          </article>
          <article class="stat-card">
            <h3>Focus Areas</h3>
            <p>
              Proton and conventional radiotherapy, LET / RBE modelling, optical photon transport, dosimetry detectors, and radiopharmaceutical therapy.
            </p>
          </article>
        </div>
      </section>

      <section class="collaborators-section section-inner">
        <h2>Collaborators</h2>
        <p>
          OpenTOPAS is jointly maintained by interdisciplinary teams at the University of California San Francisco and
          Massachusetts General Hospital / Harvard Medical School. Each site contributes physics leadership, code
          development, validation, and user support.
        </p>

        <div class="collab-grid">
          <article class="collab-card stat-card">
            <div>
              <img class="collab-logo" src="assets/img/UCSF_logo.png" alt="University of California San Francisco logo" />
              <h3>University of California San Francisco</h3>
              <p class="collab-role">Core Maintainers</p>
              <ul>
                <li>Bruce Faddegon (PI 2018-2024)</li>
                <li>José Ramos-Méndez</li>
                <li>Thongchai Masilela</li>
                <li>Naoki D-Kondo</li>
                <li>Ramon Ortiz</li>
              </ul>
            </div>
          </article>

          <article class="collab-card stat-card">
            <div>
              <img class="collab-logo" src="assets/img/MGH-Harvard_logo.png" alt="Massachusetts General Hospital Harvard Medical School logo" />
              <h3>Massachusetts General Hospital<br />Harvard Medical School</h3>
              <p class="collab-role">Core Maintainers</p>
              <ul>
                <li>Harald Paganetti (PI 2009-2016)</li>
                <li>Jan Schuemann</li>
                <li>Alejandro Bertolet</li>
                <li>Victor V. Onecha</li>
                <li>Wook-Geun Shin</li>
              </ul>
            </div>
          </article>
        </div>

        <div class="collab-grid former-grid">
          <article class="collab-card stat-card">
            <div>
              <h3>Former Contributors · UCSF</h3>
              <ul class="compact-list">
                <li>Daren Sawkey</li>
                <li>Jhonatan Carrasco Hernandez</li>
                <li>Jungwook Shin</li>
                <li>Kyungdon Choi</li>
                <li>Lucas Burigo</li>
                <li>Pierluigi Piersimoni</li>
              </ul>
            </div>
          </article>

          <article class="collab-card stat-card">
            <div>
              <h3>Former Contributors · MGH / Harvard</h3>
              <ul class="compact-list">
                <li>Aimee McNamara</li>
                <li>Alejandro Carabe-Fernández</li>
                <li>Andrea Attili</li>
                <li>David Hall</li>
                <li>David J Carlson</li>
                <li>Giulia Tamborino</li>
                <li>Hongyu Zhu</li>
                <li>Hoyeon Lee</li>
                <li>Hsiao-Ming Lu</li>
                <li>Ilaria Rinaldi</li>
                <li>Isaac Meyer</li>
                <li>Jungwook Shin</li>
                <li>Kira Grogg</li>
                <li>Lisa Polster</li>
                <li>Mauro Testa</li>
                <li>Nils Peters</li>
                <li>Robert Stewart</li>
                <li>Wonmo Sung</li>
                <li>Yizheng Chen</li>
              </ul>
            </div>
          </article>
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