Cone beam CT | 合法醫療器材資訊網

ConebeamCT(CBCT)isavarianttypeofcomputedtomography(CT),andisusedparticularlyindentalandextremityimagingbuthasrecentlyfoundnew ...

Cone-beam CT (CBCT) is a variant type of computed tomography (CT)[1], and is used particularly in dental and extremity imaging but has recently found new application in dedicated breast imaging 4,5. It differs from conventional CT in that it uses a cone-shaped x-ray beam and two dimensional detectors instead of a fan-shaped x-ray beam and one dimensional detectors. 

In cone-beam CT, a divergent cone-shaped source of radiation is directed through the target. The attenuated x-rays are detected on the opposite side by an x-ray detector, which has multiple dexels[2] in the x and y-axis 2. Volume acquisition can thus be acquired with fewer rotations of the x-ray tube gantry. This differs from fan-beam CT, which uses a 2D fan-shaped x-ray beam in helical progression to acquire image data. Furthermore, fan-beam CT detector only has dexels in the x-axis.

...