What is Cone-Beam CT and How Does it Work?

Scarfe, William C.; Farman, Allan G.

doi:10.1016/j.cden.2008.05.005

Cited by 928 publications

(905 citation statements)

References 10 publications

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“…Scatter is a very important artifact causing factor in CBCT. The scatter‐to‐primary ratio (SPR) is about 0.01 for single‐ray CT and 0.05–0.15 for fan‐beam and spiral CT, and may be as large as 0.4–2.0 in CBCT 10, 11, 12, 13, 29, 30, 31. Typical scatter artifacts show as shading or streaks, which would result in reduced contrast resolution and increased noise in CBCT imaging.…”

Section: Discussionmentioning

confidence: 99%

Optimizing the target detectability of cone beam CT performed in image‐guided radiation therapy for patients of different body sizes

Yang

Ruan

et al. 2018

J Applied Clin Med Phys

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PurposeThe target detectability of cone beam computed tomography (CBCT) performed in image‐guided radiation therapy (IGRT) was investigated to achieve sufficient image quality for patient positioning over a course of treatment session while maintaining radiation exposure from CBCT imaging as low as reasonably achievable (ALARA).MethodsBody CBCT scans operated in half‐fan mode were acquired with three different protocols: CBCTlowD, CBCTmidD, and CBCThighD, which resulted in weighted CT dose index (CTDIw) of 0.36, 1.43, and 2.78 cGy, respectively. An electron density phantom that is 18 cm in diameter was covered by four layers of 2.5‐cm‐thick bolus to simulate patients of different body sizes. Multivariate analysis was used to examine the impact of body size, radiation exposure, and tissue type on the target detectability of CBCT imaging, quantified as contrast‐to‐noise ratio (CNR).ResultsCBCTmidD allows sufficient target detection of adipose, breast, muscle, liver in a background of water for normal‐weight adults with cross‐sectional diameter less than 28 cm, while CBCThighD is suitable for adult patients with larger body sizes or body mass index over 25 kg/m2. Once the cross‐sectional diameter of adult patients is larger than 35 cm, the CTDIw of CBCT scans should be higher than 2.78 cGy to achieve required CNR. As for pediatric and adolescent patients with cross‐sectional diameter less than 25 cm, CBCTlowD is able to produce images with sufficient target detection.ConclusionThe target detectability of soft tissues in default CBCT scans may not be sufficient for overweight or obese adults. Contrary, pediatric and adolescent patients would receive unnecessarily high radiation exposure from default CBCT scans. Therefore, the selection of acquisition parameters for CBCT scans optimized according to patient body size was proposed to ensure sufficient image quality for daily patient positioning in radiation therapy while achieving the ALARA principle.

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Section: Discussionmentioning

confidence: 99%

Optimizing the target detectability of cone beam CT performed in image‐guided radiation therapy for patients of different body sizes

Yang

Ruan

et al. 2018

J Applied Clin Med Phys

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“…Conventional radiography is generally the first imaging modality performed in clinical practice. However, it offers limited information about cortical integrity, limits and size of the lesion, requiring an exam that offers more details such as CT (1,7). Cortical disruptions and soft tissue involvement can be observed in CT images, and it is useful for defining the limits of the lesion, its components and in determining its dimensions for diagnosis and follow up purposes (7).…”

Section: Discussionmentioning

confidence: 99%

“…Cone beam computed tomography (CBCT) is widely used in the diagnosis and monitoring of pathologies of the bone and teeth. The interpretation of CBCT images must be carefully performed, always considering lesion location, size and development and relation to the adjacent structures as well as enlargement or disruption of the cortical bone (1)(2)(3)(4). With the introduction of CBCT, bone lesions have been more effectively assessed in comparison with conventional radiography, which does not provide details of the lesion and also produces superimposition of images (5)(6)(7)(8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

Clinical and imagiological findings of central giant cell lesion and cherubism

Pinheiro

Júnior

et al. 2013

Braz. Dent. J.

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Cone beam computed tomography (CBCT) is the best examination for bone lesions of the maxilla, allowing the dentist to evaluate precisely the behavior and components of the lesion and their relationship to the surrounding structures. Central giant cell lesion and cherubism are histologically very similar lesions. Therefore clinical and radiological examinations are fundamentally important for the diagnosis. The aim of this paper is to report two cases diagnosed as central giant cell lesions and cherubism using CBCT. This imaging modality was very important for the diagnosis of the lesions presented in the current study. It also allowed observing precisely the limits of the lesions, the components, the behavior and the exact relationship to adjacent structures.

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“…( 18 ) There are a variety of CBCT devices available with large differences for a number of imaging parameters: peak voltage, amount of filtration, quantity of X‐rays (mAs), pulsed versus continuous exposure, beam geometry, number of projections, detector type, field of view (FOV) size, reconstruction algorithm, reconstructed voxel size, and pre‐ and post‐processing of raw and reconstructed data. Designing a QC phantom requires a cross section of all available CBCT devices, identifying common properties.…”

Section: Introductionmentioning

confidence: 99%

Development and applicability of a quality control phantom for dental cone‐beam CT

Pauwels

Stamatakis

Manousaridis

et al. 2011

J Applied Clin Med Phys

125

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Cone‐beam CT (CBCT) has shown to be a useful imaging modality for various dentomaxillofacial applications. However, optimization and quality control of dental CBCT devices is hampered due to the lack of an appropriate tool for image quality assessment. To investigate the application of different image quality parameters for CBCT, a prototype polymethyl methacrylate (PMMA) cylindrical phantom with inserts for image quality analysis was developed. Applicability and reproducibility of the phantom were assessed using seven CBCT devices with different scanning protocols. Image quality parameters evaluated were: CT number correlation, contrast resolution, image homogeneity and uniformity, point spread function, and metal artifacts. Deviations of repeated measurements were between 0.0% and 3.3%. Correlation coefficients of CBCT voxel values with CT numbers ranged between 0.68 and 1.00. Contrast‐to‐noise ratio (CNR) values were much lower for hydroxyapatite (0

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What is Cone-Beam CT and How Does it Work?

Cited by 928 publications

References 10 publications

Optimizing the target detectability of cone beam CT performed in image‐guided radiation therapy for patients of different body sizes

Optimizing the target detectability of cone beam CT performed in image‐guided radiation therapy for patients of different body sizes

Clinical and imagiological findings of central giant cell lesion and cherubism

Development and applicability of a quality control phantom for dental cone‐beam CT

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