This book contains the invited talks planned for presentation in the Sixteenth Annual Conference on Medical Physics held during Nov. 8-10, 1995 at Defence Laboratory, Jodhpur and provides a panoramic view of a variety of advance topics in Medical Physics while bringing out the current status of each topic. The book is expected to be useful to teachers to broaden their academic interests, to health physicists to evaluate the impact of use of radiations on human health and specifically to medical physicists in their pursuit to improve the quality of treatment and also in inspiring them to take up research work in the areas discussed.