What is Dental Cone Beam CT?

Dental cone beam computed tomography (CBCT) is a special type of x-ray machine used in situations where regular dental or facial x-rays are not sufficient. This type of CT scanner uses a special type of technology to generate three dimensional (3-D) images of dental structures and bone in the craniofacial region in a single scan. Images obtained with cone beam CT allow for more precise treatment planning.

With cone beam CT, an x-ray beam in the shape of a cone is moved around the patient to produce a large number of images, also called views. CT scans and cone beam CT both produce high-quality images.

Dental cone beam CT was developed as a means of producing similar types of images but with a much smaller and less expensive machine that could be placed in an outpatient office.

Cone beam CT provides detailed images of the bone and is performed to evaluate diseases of the jaw, dentition and bony structures of the face, nasal cavity and sinuses. IHowever, cone beam CT has the advantage of lower radiation exposure compared to conventional CT.

How should you prepare?

A cone beam CT examination requires no special preparation.

Prior to the examination, you may be asked to remove anything that may interfere with the imaging, including metal objects, such as jewellery, eyeglasses, hairpins and hearing aids. Although removable dental work may need to be removed. Women should always inform the radiologist if there is any possibility that they are pregnant.

What does the equipment look like?

Cone beam CT scanners are square-shaped machines that include either an upright chair for sitting or a moveable table so patients can lie down during the examination. Scanners that include a chair have a rotating C-arm, an x-ray image intensifier that contains an x-ray source and detector. Cone beam CT machines with a table include a rotating gantry.

How does the procedure work?

During a cone beam CT examination, the C-arm or gantry rotates around the head in a complete 360-degree rotation while capturing multiple images from different angles that are reconstructed to create a single 3-D image.

The x-ray source and detector are mounted on opposite sides of the revolving C-arm or gantry and rotate in unison. In a single rotation, the detector can generate anywhere between 150 to 200 high resolution two-dimensional (2-D) images, which are then digitally combined to form a 3-D image that can provide your dentist or oral surgeon with valuable information about your oral and craniofacial health

Who interprets the results?

The radiologist will analyze the images. They may discuss the results with your referring dentist.