Citation, DOI, disclosures and article data
At the time the article was created Henry Knipe had no recorded disclosures.View Henry Knipe's current disclosures
At the time the article was last revised Andrew Murphy had no recorded disclosures.View Andrew Murphy's current disclosures
Cone-beam CT (CBCT) is a variant type of computed tomography (CT), and is used particularly in dental and extremity imaging but has recently found new application in dedicated breast imaging 4,5. It differs from conventional CT in that it uses a cone-shaped x-ray beam and two dimensional detectors instead of a fan-shaped x-ray beam and one dimensional detectors.
In cone-beam CT, a divergent cone-shaped source of radiation is directed through the target. The attenuated x-rays are detected on the opposite side by an x-ray detector, which has multiple dexels in the x and y-axis 2. Volume acquisition can thus be acquired with fewer rotations of the x-ray tube gantry. This differs from fan-beam CT, which uses a 2D fan-shaped x-ray beam in helical progression to acquire image data. Furthermore, fan-beam CT detector only has dexels in the x-axis.
The advent of cone-beam CT has brought about several advantages over its fan-beam counterpart, but it also has its inherent disadvantages.
- decreased examination time
- decreased patient movement artifact
- increased x-ray tube efficiency 3
- increased scattered radiation
- potential for cone-beam artifact if an inappropriate reconstruction algorithm is used
Cone-beam CT is used to investigate the exact location of jaw pathologies such as tumors, inflammatory lesions, exact location of impacted teeth before oral or maxillofacial surgery 6.
It is also used in endodontics, implant dentistry, orthodontics, peridontics, temporomandibular joint imaging, and forensic dentistry 6.
The three-dimensional cone-beam CT aims to address the limitation of two-dimensional imaging on mammography with high contrast between pathological and normal breast tissues. It reduces the overlap of breast lesions from surrounding breast parenchyma 4.
After transcatheter arterial chemoembolisation of hepatocellular carcinoma, cone-beam CT is done to assess the amount of drug retained within the tumor 7.
Cone-beam CT guides transbronchial biopsy of peripheral pulmonary lesions and ablation of target lesion during bronchoscopy 8.
- 1. Arun Kumar Gupta, Veena Chowdhury, Niranjan Khandelwal. Diagnostic Radiology: Recent Advances and Applied Physics in Imaging. (2013) ISBN: 9789350904978
- 2. Scarfe W & Farman A. What is Cone-Beam CT and How Does It Work? Dent Clin North Am. 2008;52(4):707-30. doi:10.1016/j.cden.2008.05.005
- 3. Miracle A & Mukherji S. Conebeam CT of the Head and Neck, Part 1: Physical Principles. AJNR Am J Neuroradiol. 2009;30(6):1088-95. doi:10.3174/ajnr.a1653
- 4. O'Connell A, Conover D, Zhang Y et al. Cone-Beam CT for Breast Imaging: Radiation Dose, Breast Coverage, and Image Quality. AJR Am J Roentgenol. 2010;195(2):496-509. doi:10.2214/ajr.08.1017
- 5. Koning Health, Koning Breast CT. Koning Health Website
- 6. Kumar M, Shanavas M, Sidappa A, Kiran M. Cone Beam Computed Tomography - Know Its Secrets. J Int Oral Health. 2015;7(2):64-8. PMC4377156 - Pubmed
- 7. Orlacchio A, Roma S, dell’Olio V, Crociati S, Lenci I, Francioso S. Role of Cone-Beam CT in the Intraprocedural Evaluation of Chemoembolization of Hepatocellular Carcinoma. J Oncol. 2021;2021:1-8. doi:10.1155/2021/8856998 - Pubmed
- 8. Setser R, Chintalapani G, Bhadra K, Casal R. Cone Beam CT Imaging for Bronchoscopy: A Technical Review. J Thorac Dis. 2020;12(12):7416-28. doi:10.21037/jtd-20-2382 - Pubmed