How Cone-Beam CT is Superior
Computed tomography imaging, also known as computed axial tomography scanning, involves the use of rotating x-ray equipment, combined with a digital computer, to acquire images of the body. Using CT imaging, cross sectional images of body organs and tissue can be produced. Though there are many other imaging techniques, CT imaging has the exceptional capability of offering clear images of different types of tissue. CT imaging can provide views of soft tissue, bone, muscle, and blood vessels, without giving up on precision and clarity. Other imaging techniques are much more limited in the types of images they can provide.
Cone-beam CT scanner is a compact, quicker and safer version of the regular CT. Through the use of a cone-shaped x-ray beam and a flat panel detector, the size of the scanner, radiation dosage and time needed for scanning are all spectacularly reduced. A typical cone-beam CT scanner can fit easily into any dental (or other medical) practice and is easily accessible by patients. The time needed for a full scan is minimal and the radiation dosage is up to a hundred times less than that of a standard CT scanner.
What Does a Cone-Beam CT Scanner Produce?
Cone-Beam CT scanners are continually generating x-ray images, while rotating around the patient. By rotating the beam around the targeted region and creating an image every few degrees, the region of interest can be studied from many angles. Then, with the help of advanced image reconstruction software, the image can be viewed in 3-D at high resolution.
Cone-Beam CT Improves Clarity
The increased scatter generated by cone-beam CT scanner systems, compared to conventional multi-detector CT, accounts for the most significant differences in image artifacts, decreased contrast-to-noise ratio and inaccuracies in CT number calculations. Differences in dynamic range and temporal resolution between C-arm cone-beam CT scanner and multi-detector CT and the resultant effect on image quality are also substantial.
Cone-Beam CT in Dental Applications
Dental cone-beam CT scanner is a recently introduced technology which provides 3- dimensional radiographic imaging, typically as a series of cross-sectional anatomic views of the area of interest. Two main types of dental cone-beam CT scanner units are available. The first type of dental cone-beam CT system is similar in appearance and construction to a dental panoramic tomography unit, with the patient in an upright position. The second type, of which fewer systems are available, has the appearance of a small, conventional CT scanner with the patient lying completely flat on a couch.
Dental cone-beam CT scanning has a wide range of uses in oral and maxillofacial surgery, orthodontic surgery, restorative work and implant planning. It can also have applications in skull trauma and reconstruction cases. An advantage of this technique is that it can provide a lower dose alternative to conventional CT imaging. However, dental cone-beam CT cannot replace conventional CT imaging in all cases, as it does not demonstrate soft tissues adequately enough for all diagnoses.
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