Hello dear,
I hope you are doing well and good. As you asking for what is radiology and how it's useful  so according to my knowledge
Radiology is also known as diagnostic imaging. Radiology is useful in several operations such as CT scan, MRI, X-ray, ultrasound, etc required during diagnosis. Radiology isthe principle management process of all the disease. It also contains a variety of tools and techniques for detection, analyzing, and curing
Goodluck!