The authors of this book are all engaged in teaching the radiations courses in the curriculum of the Graduate School of Medicine of the University of Pennsylvania. Such courses are designed primarily for graduate students and fellows in radiology and dermatology. These men, therefore, should have firsthand information as to the needs, abilities and limitations of the physicians who would have occasion to use this book as a text or reference.
The authors state that the book is intended to serve as a thorough text on physics for radiologists. They also state that it has been their aim to develop a reasonably complete introductory text, with emphasis placed on simplicity and clarity, but no compromise has been made with the requirement of rigor. Within limitations and with certain exceptions their aim has been fulfilled. However, to attempt to bridge the gap between no knowledge and advanced specialization is a noble