Xu LM, et al. - The physicians compared dosimetric parameters among different fixed-field intensity-modulated radiation therapy (IMRT) solutions and volumetric-modulated arc therapy (VMAT) to recognize which could achieve the lowest risk of organs at risk (OARs) and treatment delivery efficiently. In patients with primary mediastinal large B-cell lymphoma (PMBCL), the 7- and 9-field IMRT and VMAT techniques both could be safely and efficiently delivered.