Cone-beam computed tomography, or CBCT, is a digital dentistry system that has gained vast popularity in the past decade. This type of CT is a variation of traditional computed tomography (CT) systems. In CBCT, patient data is captured by an x-ray beam shaped like a cone or a pyramid, which is different from the fan-shaped beam in traditional CT. After a scan, several sequential planar images are reconstructed using algorithms to produce 3d images.
Cone-beam CT can be categorized by field of view (FOV). FOV refers to the anatomical area that will be included in the data volume or the area of the patient that will be irradiated. Depending upon the type of the cone beam machine and the geometry of the x-ray beam, FOV sizes could be classified as small or limited, medium, or large.
Typically, each CBCT FOV size has different applications and is used in different aspects of dentistry. Therefore, when using a CBCT, selecting the optimal FOV sizes is crucial. In this article, we are going to compare different CBCT FOV sizes and explain the clinical application of each one.
To make the comparison clearer, we are going to look specifically at PreXion 3D Excelsior CBCT. The PreXion CBCT offers 5 FOV sizes ranging from small to large: 50x50mm, 100x50mm, 100x81mm, 150x81mm, and 150x130mm.
PreXion CBCT FOV Sizes
5×5 images work well for a specific area diagnosis with minimal X-ray exposure for the patient. Therefore, they are especially effective for endodontic diagnosis by checking root canal conditions.
10×5 images generate a wide range to view oral conditions in the maxillary and mandibular areas, making them especially effective for clinical procedures related to the mandibular nerve, mental foramen, or maxillary sinus.
10×8 images generate a comprehensive diagnosis and treatment planning. Thus, they are useful for complex implant surgery and diagnosis of the TMJ.
15×8 images generate the most optimal information for oral diagnosis. They cover both maxillary and mandibular structures in a single scan. It is effective for most oral surgery cases, including placement of multiple implants.
Finally, 15×13 images generate the most optimal information of larger implant cases, airway and TMJ analysis, orthodontics, and dental sleeping solutions.
Some other notes
Dentists must identify the appropriate FOV sizes before diagnosis. Additionally, dentists should choose the FOV size with the smallest volume possible that can accommodate the region of interest to limit radiation exposure to the patient.
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