David A. Bluemke, MD, PhD, Editor of Radiology discusses four research articles from the October 2019 issue of Radiology. ARTICLES DISCUSSED – Summary of White Matter by Diffusion MRI Following Methylphenidate Treatment: A Randomized Control Trial in Males with Attention-Deficit/Hyperactivity Disorder. Radiology 2019; 293:186–192.; Summary of Functional MRI Safety and Artifacts during Deep Brain Stimulation: Experience in 102 Patients. Radiology 2019; 293:174–183.; Summary of Hypersensitivity Reactions to Iodinated Contrast Media: A Multicenter Study of 196,081 Patients. Radiology 2019; 293:117–124.; Summary of Left Ventricular Mass at MRI and Long-term Risk of Cardiovascular Events: The MESA study. Radiology 2019; 293:107–114.;