Book excerpt: Publisher's Note: Products purchased from 3rd Party sellers are not guaranteed by the Publisher for quality, authenticity, or access to any online entitlements included with the product. The 4th Edition of Mammographic Imaging: A Practical Guide remains the most up-to-date and comprehensive book in the field. A perfect all-in-one solution for coursework, board prep, and clinical practice, this bestseller reflects the latest ARRT educational and certification exam requirements, as well as the ASRT recommended curriculum. Technologists seeking to stay current in the profession and students preparing to enter the field will appreciate the 227 new photos, the wide range of case studies, and the interactive online exam simulator with ARRT registry-style questions.