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Wednesday, 16 September 2015

How X-Rays Play Their Role in Imaging?



Imaging using X-rays involve an X-ray tube that penetrates the body to produce a beam of x-rays. When the tube passes through the body, some parts of the X-ray beam energy get absorbed by the body, which is dubbed X-ray beam attenuation. The attenuated x-rays are captured by a film or detectors on the patient's body's opposite side. This produces a clinical image as a result. Conventional radiography results in production of a 2D image. In case of Computed tomography (CT), on the other hand, detector and tube both rotate around the body and a number of images are obtainable, which provides for a 3D visualization.
Usually, X-ray radiography, CT, fluoroscopy, angiography and mammography are used as varied imaging methods to conduct an x-ray test.
It is well known that different organs of the body of the patient absorb or react to x-rays in different ways. This is the only reason why some organs or tissues appear white, some gray and some dark. Also, this is the reason why some or the other body parts face more risks from x-ray examinations as compared to some others.
A parameter of the dose that gets absorbed by the patient's body and keeps differing sensitivities into its account is called an effective dose.
Yes, there may be some risks related to the same. But, doctors know how to deal with them. They make every possible effort to reduce the radiation dose to the minimum. National as well as international radiology protection council keeps updating the technical standards that guide doctors to take extra care when conducting the x-ray tests. Doctors are guided to keep the radiation dose at the lowest possible.
Advanced and hi-tech x-ray systems are already into use which let the doctors reduce the dose of radiation with their special features. For an instance, such technologies have been developed that make sure that the body parts of the patient not being imaged get either minimum or no radiation exposure.
Different applications of X-rays
  • Radiography
Traditional x-rays have shown advancement over time as the film is constantly being replaced by the digital x-ray techniques.
  • Computed Tomography (CT)
The body's detailed images are produced by CT. These images are of high definition and thus, allow for additional information over what is produced by conventional radiography.
  • Fluoroscopy
The part of medical imaging which results in a continuing 'live' x-ray picture of the internal parts of the patient's body on a monitor is dubbed fluoroscopy.
  • Angiography
The X-ray method that focuses on viewing of organs and blood vessels, the heart in particular, through a contrast agent injection into blood is angiography. This results in improved visibility on x-ray picture.
  • Mammography
The x-ray technique that concentrates on producing detailed images of breast and helps detect breast cancer at an early stage is mammography.

Article Source: http://EzineArticles.com/8974157