RecruitingClinical trialHyperfractionated Dual Equivalent Fractionated Radiation TherapyThis study evaluates the feasibility and safety of a novel method for comparing the effectiveness of hypofractionated versus hyperfractionated radiation therapy in participants with relapsed/refractory diffuse large B-cell lymphoma (R/R DLBCL) undergoing T-cell redirection therapies (CAR T-cell therapy or bispecific antibodies).