Cone Beam CT (CBCT)
Definition
A three-dimensional imaging modality producing volumetric data of the jaws at lower dose than medical CT. Allows multiplanar reconstruction and surface rendering of dental and bony structures.
- Output
- 3D volumetric jaw imaging
- Dose
- Lower than medical CT
- Capability
- Multiplanar reconstruction, surface rendering
- Field
- Radiographic dental identification
Common questions
Why would a forensic odontologist choose CBCT over a standard panoramic or periapical dental radiograph?+
CBCT provides a true three-dimensional volume rather than a flat projection, so it avoids the superimposition and distortion inherent in 2D radiography and allows measurements and morphological comparisons in any plane, which is valuable when antemortem records include volumetric imaging or when precise anatomical measurement is needed for comparison.
Can CBCT data be compared directly with a conventional 2D panoramic radiograph taken years earlier for the same individual?+
Yes, CBCT software can generate simulated panoramic and periapical views from the volumetric data, allowing a direct visual comparison against older 2D antemortem films even though the imaging modalities differ, though the examiner accounts for differences in projection geometry when comparing the two.
Related terms
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- Digital Superimposition
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- Frontal Sinus Comparison
- Identification method using the unique outline shape of the frontal sinus, visible on skull radiographs or CT, to compare AM and PM...
- Panoramic Radiograph (OPG)
- A wide-field tomographic image of the entire dentition and jaws on one film or sensor. Useful for overview but subject to magnification...
- Periapical Radiograph
- A dental radiograph showing the full length of one to three teeth, including roots and surrounding bone, from crown to apex. The...