1. Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
2. The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX 77030, USA
3. Department of Imaging Physics, Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
4. Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
5. The University of Queensland, Saint Lucia 4072, Australia
6. The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
7. Department of Physics, University of Houston, Houston, TX 77004, USA
8. Department of Computer Science, Rice University, Houston, TX 77005, USA