In recent decades imaging has proved one of the most rapidly expanding areas of medicine. The present day trainees entering radiology are no longer trained by radiologists who cover and are well informed on most aspects of their specialty as was the case with previous generations. Instead they encounter a confusing array of subspecialists divided both by systems and by techniques. The system specialists include neuroradiologists. vascular radiologists. gastrointestinal radiologists. chest radiologists. and skeletal radiologists. Technique specialists include experts in nuclear medicine....