Helical Computed Tomography and Its Uses

The method of radiology includes the various imaging techniques that are used for the detection, diagnoses as well as the treatment of various diseases. Some of the imaging techniques are the X-rays, the MRI, the computed tomography scan, and the ultrasound. In the method of computed tomography the medical imaging employs tomography that is created by the computer processing. The method of computed tomography digital geometry processing is used in order to generate the three dimensional image of the inside of an object from a large series of the two dimensional X-ray images that are taken around a single axis of rotation.

Using the computed tomography, a large amount of data is produced that can be manipulated through a process using a process that is known as ‘windowing’. One special kind of computed tomography is that of the spiral or the helical computed tomography. In this type of the three dimensional computed tomography, the source usually that of the X-rays describes a helical trajectory relative to the object whereby a two dimensional array of detectors measure the transmitted radiation on part of a cone of rays that emanates from the source. In the practice of helical computed tomography the source as well as the detectors is mounted on the rotating gantry. The patient is moved axially at a uniform rate.

One of the major advantages of the helical computed tomography is that while using this technique a reduced amount of dose of the X-rays is required for the patient for a given amount of resolution while the scanning is done more quickly than the other methods of the computed tomography. In the recent developments that have taken place in the field of the helical computed tomography, the images can be produced in less than a second thus enabling a faster diagnosis.


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