Plain x-ray film The Basics of  X-ray

How X-ray works —

• Radiographic film before an image is taken is transparent and x-rays made it Darker by reactions,
• When a x-ray radiograph is taken,the X-rays reach the film and made it darken
• So , more X-rays reach an area of the film, the darker that area will be on the radiograph.
• and the lesser the xray the more brighter the area after the x-ray,
• if an object is very dense,then less X-rays will reach the film and the less darker the area become, and the image of the object will appear white on the radiograph.
• if an object has little density,because it allows most of the X-ray beam to reach the film, so its image will appear black on the radiograph

Types of X-ray Radiograph —

• Only five basic X-ray radiographic densities exist,

1. gas,
2. fat,
3. fluid,
4. bone and
5. metal densities

• They are in order of increasing brightness order
• A film should not be too dark (over exposed ) or too white (under exposed).
• A good quality film can really improve the precision of a diagnosis.

key concept of X-ray Radiology —

• Key concept.

Plain x-ray film The Basics of X-ray key concept of Radiology

• The five radiographic densities are in order of increasing brightness:

1. Air,
2. Fat,
3. Fluid,
4. Bone,
5. Metal

• the lungs filled with air so X-ray become dark, or air density,
• heart X-ray appears lighter than the lungs X-ray, because they are largely composed of water,
• Bones X-ray are brighter structures because they are composed of calcium
• So all Anatomic structures seen on the X-ray radiograph can be identified by their characteristic density