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How to Select Optimal CBCT FOV Sizes

how to select optimal CBCT FOV sizes

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.

examples of different CBCT FOV sizes
Different CBCT FOV sizes

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 3D Excelsior CBCT FOV
PreXion 3D Excelsior CBCT FOV sizes

PreXion CBCT FOV Sizes

50x50mm

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.

fov size 5x5
cbct fov size 5x5

100x50mm

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.

fov size 10x5
cbct fov size 10x5

100x81mm

10×8 images generate a comprehensive diagnosis and treatment planning. Thus, they are useful for complex implant surgery and diagnosis of the TMJ.

fov size 10x8
cbct fov size 10x8

150x81mm

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.

fov size 15x8
cbct fov size 15x8

150x130mm

Finally, 15×13 images generate the most optimal information of larger implant cases, airway and TMJ analysis, orthodontics, and dental sleeping solutions.

cbct fov size 15x13

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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