Introduction to Technical Seminar Presentation on X-Ray and CT Scan:

X-rays are discovered by a physicist from Germany named Will elm Konrad Rontgen in November 1895. He firstly named as ‘new kind of ray’ or called as X-rays, where x stands for unknown. They are being used for visualizing the anatomy of humans internally. Now a day X-rays have become common tool in the medical field. The simple technique such as chest radiography to a complex technique of digital subtraction depends on the usage of X-rays.

The properties of X-rays, which are responsible for usage in medical field are, their ability for producing luminescence and also its effect in case of photographic emulsions.  It has also capability for penetration of matter in various materials.

The principle of X-rays include, an energy source which is responsible for accelerating electrons ,also a free electron path, a means for focusing on the electron beam and also a device for stopping of the electrons.

The two limitations involved in usage of X-rays are, the super-imposition of the three-dimensional information onto a single plane results in making diagnosis confusing and also difficult. And the second is that, the photographic film which is used for making the radiographs will have a limited dynamic range and therefore there exists some contrast differences on the film to be distinguished by eye.

The computed tomography is used for determining the characteristics of every tissue in the parent slice which makes the transmitted radiation intensity recorded from all directions. The calculated tissue characteristics compose actually to the CT image.

We can conclude that from the development of CT technology there was a rapid development in the hardware and also in detector technology. The images give a high quality maps with X-ray linear coefficients of parent tissues.

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