FUDAN UNIVERSITY SHANGHAI CANCER CENTER 1.只 outine Radiology X-rays A form of electromagnetic radiation Their frequency and energy are much greater than visible light They are able to pass through a patient and onto screen/film com bination or digital detector thus producing an image An object will be seen with X-ray if its borders lie beside tissue of different density, which means contrast ⑨复旦大学上海医学院肿痼学糸FUDAN UNIVERSITY SHANGHAI CANCER CENTER 复旦大学上海医学院肿瘤学系 1. Routine Radiology X-rays • A form of electromagnetic radiation • Their frequency and energy are much greater than visible light • They are able to pass through a patient and onto screen/film combination or digital detector thus producing an image • An object will be seen with X-ray if its borders lie beside tissue of different density, which means contrast