Radiography

Imaging technique using X-rays

Radiography is an imaging technique that uses X-rays to view the internal form of an object. To create the image, X-rays are passed through the body and captured on a detector. The resulting image is called a radiograph.

History

First medical X-ray by Wilhelm Röntgen of his wife Anna Bertha Ludwig's hand, 1895

Radiography was discovered in 1895 by Wilhelm Röntgen, a German physicist, who produced the first X-ray image of his wife's hand. This discovery revolutionized medical diagnostics and led to the development of modern radiographic techniques.

Principles

Radiography works on the principle of differential absorption of X-rays by different tissues in the body. Dense tissues such as bone absorb more X-rays and appear white on the radiograph, while softer tissues absorb fewer X-rays and appear darker.

Equipment

A modern X-ray machine

A typical X-ray machine consists of an X-ray tube, a detector, and a control console. The X-ray tube generates X-rays, which pass through the patient and are captured by the detector to create an image.

Types of Radiography

Projectional Radiography

Components of projectional radiography

Projectional radiography is the most common form of radiography, where X-rays are projected through the body onto a detector. It is used for imaging bones, chest, and other body parts.

Computed Tomography (CT)

CT workstation for imaging the neck

Computed tomography (CT) uses X-rays to create detailed cross-sectional images of the body. It is particularly useful for imaging complex structures such as the brain, chest, and abdomen.

Fluoroscopy

Fluoroscopy provides real-time moving images of the interior of the body. It is often used in procedures such as angiography and barium swallow studies.

Applications

Radiography is used in various medical fields, including:

• Orthopedics: For diagnosing fractures and joint abnormalities.
• Dentistry: For imaging teeth and jaw structures.
• Cardiology: For visualizing the heart and blood vessels.

Safety

Radiography involves exposure to ionizing radiation, which can pose risks if not properly managed. Protective measures such as lead aprons and thyroid shields are used to minimize exposure.

Related pages

• X-ray
• Computed tomography
• Fluoroscopy
• Wilhelm Röntgen