Essential daily knowledge for Radiology and Radiology assistants The book contains the topics of the theoretical part of the IEK Certification exams for the specialty "Radiology and Radiology Assistant". The answers to the questions are written in a simple, comprehensible and comprehensive way, in order to facilitate the study of students who want quick and meaningful results. However, the book is not only aimed at IEK students. It contains useful information for anyone who wants to gain essential knowledge of medical imaging devices (x-ray machines, angiograms, mammograms, ultrasounds, CT and MRI scanners, etc.), which may prove valuable in the future — both to him and to to his relatives. The authors Dimos Gravanis is a Specialist Radiologist, Director of the Radiology Laboratory of ALPHA PROLIPSIS Medical Laboratories. Michalis Tsimogiannis is a Technologist of Medical Imaging Devices and has graduated from ATEI of Athens. He works as a Radiologist Assistant in the Radiology Laboratory of 401 GSNA. Stavros Archontakis is a Specialist Cytologist, Director of the Cytology Laboratory of the 401 GSNA and the ALPHA PROLIPSIS Medical Laboratories. He has worked for five years as a professor in a public IEK, teaching more than 600 educational hours of medical courses. He is a certified trainer from the National Certification Center and has been an examiner of the theoretical and practical part of IEK graduate certification exams. He has been designated from time to time by the OEEK as an assessor of paramedical specialties of various IEK and is a member of the Special Technical Committee of the National Accreditation System for Clinical Laboratories. He has written a number of books of medical interest which have been published and are in circulation.