Varian is writing this response to Rahman et al1Rahman al.Electron FLASH delivery at treatment room isocenter for efficient reversible conversion of a clinical LINAC.Int J Radiat Oncol Biol Phys. 2021; 110: 871-881Abstract Full Text PDF Scopus (18) Google Scholar express concern over modifying linear accelerators (LINACs) perform research and then restoring those same LINACs use, as described i...