You need to have the most specific information possible about your patients' conditions to provide them with the best possible treatment. Cone beam computed tomography (CBCT) is the best way to capture this information. 3D scans provide detailed information about tooth position, bone dimension and quality, TMJ disorders, and other dental conditions that are not present in 2D imaging. Field of view (FOV) refers to the anatomical area that’s included in the 3D data volume. This is also the area where the patient receives radiation when capturing the dental cone beam scan.
Depending on the type of machine and the geometry of the X-ray beam, the FOV is typically classified as small, medium, or large. ALARA Principles (As Low As Reasonably Achievable) are used to assess which radiographic modality and field of view should be chosen for a particular clinical purpose. This helps to maintain patient safety while still capturing the required images for diagnoses and treatment planning.
Area Captured by Large Field of View Cone Beam
Large FOV cone beam is frequently used by orthodontists, sleep specialists, oral surgeons, and oral radiologists. Large FOV systems are typically recommended for specific cases with skeletal anomaly/asymmetry and where orthodontic/orthognathic surgery and other craniofacial surgeries or applications are required.
A large FOV scan can cover an area from 11 to 24 cm in height and most of the craniofacial region. For comprehensive surgical planning and some orthodontics, a scan that extends from the inferior border of the mandible to the supraorbital ridges or vertex of the skull is required. Most large FOV cone beam systems can be collimated, or adjusted, to scan just the area of interest. Every patient is different, but it’s important to use the smallest possible FOV to minimize radiation exposure per the ALARA Principle.
Most large FOV units will deliver extracted 3D panoramic renderings and/or dedicated 2D pano X-rays. However, some large FOV units do not include dedicated 2D panoramic imaging at all. Be sure to discuss all your imaging needs with your Renew Digital Sales Representative to make sure they help you select the best fit for your practice.
Large Field of View Cone Beam for Orthodontics
Orthodontists are increasingly seeing the benefits of CBCT imaging in their practices. The large field of view provides them with a 3D visualization of the entire craniofacial area. With a 3-dimensional view of structural and anatomic relationships, they can provide a more accurate evaluation than ever before.
There are two unique benefits of CBCT for orthodontics. First, numerous linear or curved planar projections can be derived from one CBCT scan for greater efficiency in capturing patient records. Second, the CBCT data can be reconstructed to provide unique images that have previously been unavailable with traditional 2D imaging.
Orthodontists frequently use large FOV scans to capture:
hard tissue exams and records
determine present types of dentition
visualize arch size, shape, and symmetry
anteroposterior and traverse maxilla mandibular relationships
the number, size, shape, and location of teeth
Large Field of View Cone Beam for Airway Studies
Large FOV CBCT scans are acquired to assess the craniofacial skeleton for orthodontics and orthognathic surgery and this typically includes the airway spaces. A large field of view CBCT can also help identify patients that are prone to Obstructive Sleep Apnea.
Large Field of View Cone Beam for Oral Surgery
With a large FOV CBCT, you are better able to analyze jaw pathology and assess any impacted third molars and supernumerary teeth as well as their relationship to vital structures. Large FOV is also useful to assess bone grafts and analyze and assess paranasal sinuses.
Oral surgeons tend to use large FOV cone beam to diagnose and perform orthognathic surgeries, post-treatment esthetic evaluations, TMJ and condyle evaluations, cleft palate, craniofacial reconstruction, fractures of the facial bones, and more.
Limitations of Large Field of View Cone Beam
The biggest disadvantage of large field of view cone beam systems is the higher radiation exposure. Also, some larger field of view systems have slightly lower image resolution than their smaller counterparts.
Thankfully, this is typically not a concern for most orthodontic or surgical practices because most large FOV systems can be adjusted by height to capture only the region of interest, and by resolution to control the amount of radiation needed. Scan times and radiation output can also be reduced when exact precision is not required. In addition, some large FOV cone beam systems feature a QuickScan option which allows practices to capture a full craniofacial scan quickly, with a radiation dose that is similar to or less than standard 2D panoramic images.
Trust the Dental Imaging Experts
Renew Digital can help you find the perfect large field of view cone beam system for your practice and budget requirements. Our Sales Team are experts at understanding your clinical needs so they can find the best fit for you, both now and in the future, and can often save you 30-50% off the price of new large field of view cone beam systems.
Your purchase with Renew Digital includes expert installation and training from our certified technicians, warranty, and unlimited support. Contact us today to learn more!
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