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https://pubmed.ncbi.nlm.nih.gov/38092967
This study found that using flattening filter-free (FFF) photon beams for stereotactic body radiotherapy (SBRT) of lung or liver lesions with volumetric modulated arc therapy (VMAT) results in shorter treatment times, significant dose savings, and similar or improved target coverage and organ sparing compared to flattened beams of the same energy level.