CBCT - Applications

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CBCT - Applications

Time & Location

Sep 12, 2020, 8:00 PM – 9:30 PM GMT+5:30

About the Event

Presented by


Dr. S Jayachandran MDS, Ph.D., MAMS, FDS RCPS (Glasgow)

Professor and Head of the Department

Department: Department of Oral Medicine and Radiology

Institution: Tamil Nadu Government Dental College & Hospital, Tamil Nadu 6000 03

Affiliation: Tamil Nadu Dr. M.G.R. Medical University,Chennai, Tamil Nadu 600032

Ph No: +91 9444185662

Email id:

· CBCT-Introduction

· CBCT-Working Principle And System

·  CBCT-Merits And Limitation

· CBCT-Applications

· CBCT-Future Research

· CBCT-Conclusion

Three-dimensional imaging (3D) evolved to meet the demands of advanced technologies in delivering the treatment and at the same time responsible for the evolution of new treatment strategies. Cone-beam computed tomography (CBCT) is a recent technology initially developed for angiography in 1982 and subsequently applied to maxillofacial imaging. It uses a divergent or “cone” -shaped source of ionizing radiation and a two-dimensional area detector fixed on a rotating gantry to acquire multiple sequential projection images in one complete scan around the area of interest. Four technologic factors have converged to make this possible:

· The development of compact high-quality flat-panel detector arrays,

· Reductions in the cost of computers capable of image reconstruction,

· Development of inexpensive x-ray tubes capable of continuous exposure and,

· Limited volume scanning (e.g., head and neck), eliminating the need for sub-second gantry rotation speeds.

The X-ray parameters of CBCT is comparable to that of panoramic radiography with a usual operating range of 1-15 mA at 90-120 kVp, while that of CT is considerably higher at 120- 150 mA and 220 kVp. The captured 2D images are instantaneously conveyed to the computer, which reconstructs them, using modified Feldkamp algorithm into the anatomical volume for viewing at 1:1 ratio in axial, coronal, and sagittal planes (orthogonal planes) X-ray beam

The cone-beam technique involves a rotational scan exceeding 180 degrees of an x-ray source and a reciprocating area detector moving synchronously around the patient ’ s head. During the rotation, many exposures are made at fixed intervals, providing single projection images known as basis images. There are four components to CBCT image acquisition:

· X-ray generation

· Image detection system

· Image reconstruction

· Image display

Image accuracy, rapid scan time, dose reduction, display modes unique to maxillofacial imaging, and reduced image artefact are the main advantages of CBCT. It is widely used in general dentistry, endodontics, oral and maxillofacial surgery, orthodontics, pedodontics, periodontics, TMJ imaging, dental implants, fractures, forensic dentistry, and ENT application. Limitation for conventional CT over CBCT is higher levels of ionizing radiation, longer scanning time, and larger size. We can reduce the levels of radiation in CBCT by directing cone-beam x-rays to the area of interest only. This can be done by choosing a different field of view (FOV).

Cone Beam Computed Tomography has heralded a shift from 2D to a volumetric approach in maxillofacial imaging. So far, 2D imaging has assisted dentistry effectively and is bound to do so in the near future. CBCT imaging surpassed the obstacles of 2D imaging, offering practitioners with high quality, sub-millimeter resolution images, with short scanning time and low radiation dose. Since this equipment has become an accompaniment to the dentist, dependence upon practice-based guess-estimations will be replaced, benefiting both patient and dentist. Further application and the increasing availability of CBCT are expected to extend maxillofacial CBCT imaging from diagnosis to image guidance of operative and surgical procedures

  • CBCT - Applications
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