X-rays

X0ray appearance on a conventional radiograph

• Gas- Black
• Fat-Dark Grey
• Soft Tissue- Grey
• Bone- White
• Metal- Bright White

Medical X-ray Radiography

A conventional X-ray machine generates electrons when its cathode, a tungsten filament, is heated. The cathode is positioned in the hed of the tube which is kept under vaccuum conditions. The electrons emitted are attracted to the anode by a large potential difference. The anode gives off X-ray photons. Most of the radiation is absorbed by the tube but a windows allows some to escape.

Forming an X-ray Image

The X-ray beam is focussed onto the body or structure under investigation. The X-rays pass through the body to impact…