An Introduction to Medical Physics by Muhammed Maqbool

Author:Muhammed Maqbool
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

When first introduced, mammographic systems used direct exposure radiographic film to obtain the high spatial resolution required at the cost of high radiation dose. Since the mid-1970s, intensifying screens were used in conjunction with radiographic film and greatly reduced the radiation exposure while maintaining the high image resolution. At present, the most common image receptor used in conventional mammography is the screen-film combination (shown in Fig. 7.7). The receptor comprises a film mounted onto an intensifying screen. The screen-film combination is housed in a light-tight cassette. Intensifying screens are used to capture X-rays and then emit visible light. When an X-ray is absorbed by the intensifying screen, the light scintillation produces several light photons. The film next to the screen captures these light photons and produces the mammographic image.

Fig. 7.7Illustration of the components and blurring effect of screen-film mammographic image receptors

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.