Book excerpt: Since its first edition in 1980, Essential Physics forRadiographers has earned an international reputation as a clear andstraightforward introduction to the physics of radiography. Now inits fourth edition, this book remains a core textbook for studentradiographers. The authors have retained the pragmatic approach of earliereditions and continue to target the book particularly at thosestudents who find physics a difficult subject to grasp. The fourthedition builds on the major revisions introduced in the thirdedition. The content has been updated to reflect recent advances inimaging technology. The chapter on Radiation Safety has beencompletely rewritten in the light of the latest changes in relevantlegislation, and a re-examination of the physical principlesunderpinning magnetic resonance imaging forms the basis of a newchapter. Worked examples and calculations again feature strongly,and the innovative and popular Maths Help File, guides readersgently through the mathematical steps and concepts involved. Thereference citations have been updated and now include Internetsources.