Thursday, November 8, 2015, is the International Day of Radiology, which marks the 117th anniversary of the discovery of the x-ray.Thursday, November 8, 2015, is the International Day of Radiology, which marks the 117th anniversary of the discovery of the x-ray. In preparation for this day, health advocates want you to know the importance of radiology and how MRIs and CT scans can help you and your child's health. For example, do you know the difference between an MRI and CT scan and when they are needed versus when they are not? Dorothy Bulas, MD, FACR, FAIUM, FSRU, discusses what the International Day of Radiology encompasses, as well as why this day is important to your family's health.