This book is to-the-point and keeping the length limited, developed especially for students of radiology preparing for examination and who are always short of time. It is not intended to be a comprehensive reference. It teaches the essential physics of diagnostic radiology and its application in modern medicine. It is structured such that the student is pioneered to radiology physics and is prepared to do well in examination without taking surplus time. Adequate figures and tables have been endowed with to give a better understanding of the subject. The book covers most questions asked in and during theory and practical examination.