Field of View (FOV) is dictated by the sensor size and the setting on the machine. The larger the CBCT sensor the larger the final FOV will be and the higher the cost of the machine. Choosing the right sensor size or FOV is crucial and should be at the top of your list.
FOVs in CBCT can be divided into small, medium, large and extended fields of views Small Field of View- Usually 5cm x 5cm (length by height) or less. Applications are typically for:
- Endodontics, as a small FOV is quite sufficient as the area of interest is a single tooth or few teeth.
- Single Site Implant
Medium Field of View – Usually, 5cm x 7cm, 8cm x 8 cm, 10cm x 5cm, 12 cm x 8 cm and 10cm x 10 cm. There machines can collimate the x-ray beam to a smaller FOV so if you want a single tooth scan, you do not need to scan the entire maxillo-mandibular area. Medium FOV can capture both jaws at a time excluding the temporomandibular joint (TMJ). However, TMJs can be scanned each separately if needed.
- Ideal for most General Dentistry practices that are placing implants both free handed and guided. Can also be used for All On 4 cases with single or dual arches.
- Allows for a small FOV if looking at a fractured tooth or endodontic issues.
- Allows visualization of wisdom teeth even when impacted and allows a full view of the region of interest around the wisdom teeth.
- Can be set up to capture a view of one side of the head to view the TMJ joint.
Large Field of View – Usually, 15cm x 15cm. This is preferred by Oral Surgeons.
- Ideal for viewing and evaluating pathology
- Surgical evaluation and planning
- Airway assessment for sleep apnea
- TMJ evaluation
Extended Field of View – Usually, 20cm x 20cm. Used mainly by Orthodontists as it captures areas outside the maxilla-mandibular region to include the Sella Turcica and base of the skull.