What is oral CBCT?
CBCT is the abbreviation of Cone beam CT, that is, cone beam CT.
As the name suggests, it is a cone-beam projection computer recombination tomographic imaging device. The principle is that the X-ray generator uses a low radiation dose (usually the tube current is about 10 mA) to make a circular DR (digital projection) around the projection body. . Then, the data obtained in the "intersection" after digital projection of the projected body multiple times (180-360 times, depending on the product) is reorganized in the computer to obtain a three-dimensional image. The projection principle of CBCT acquisition of data is completely different from traditional sector scan CT, and the algorithm principle of later computer reorganization is similar.
The biggest difference between CBCT and tomographic CT (spiral CT) is that the projection data of tomographic CT is one-dimensional, the reconstructed image data is two-dimensional, and the reconstructed three-dimensional image is composed of multiple consecutive two-dimensional slices. The image has heavy metal artifacts. The projection data of CBCT is two-dimensional, and three-dimensional images are directly obtained after reconstruction.
From their imaging structure, CBCT uses three-dimensional cone beam X-ray scanning instead of two-dimensional fan beam scanning of tomographic CT. Correspondingly, CBCT uses a two-dimensional planar detector to replace the linear shape of tomographic CT. detector. Obviously, the use of cone beam X-ray scanning in CBCT can significantly improve the utilization of X-rays. All the original data needed for reconstruction can be obtained by rotating 360 degrees, and the projection data collected by the planar detector can speed up the data collection speed. ; Another advantage of CBCT is its high isotropic spatial resolution.
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