A new approach to expand the field of view for MV cone beam computed tomography

Modern dentistry commonly uses a variety of imaging methods to support diagnosis and treatment. Among them, cone beam computed tomography (CBCT) is particularly useful in presenting head structures, such as the temporomandibular joint (TMJ). The determination of the morphology of the joint is an important part of the diagnosis as well as the monitoring of the treatment results. It can be accomplished by measurement of the TMJ gap width at three selected places, taken at a specific cross-section. This study presents a new approach to these measurements. First, the CBCT images are denoised using curvilinear methods, and the volume of interest is determined. Then, the orientation of the vertical cross-section plane is computed based on segmented axial sections of the TMJ head. Finally, the cross-section plane is used to determine the standardized locations, at which the width of the gap between condyle and fossa is measured. The elaborated method was tested on selected TMJ CBCT scans with satisfactory results. The proposed solution lays the basis for the development of an autonomous method of TMJ index identification.

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Evaluation of Cone Beam Computed Tomography Artifacts Produced by Metal Objects Located Within and Outside the Field of View

Journal of Endodontics ◽

10.1016/j.joen.2021.12.001 ◽

2021 ◽

Author(s):

Ahmad Kassabji ◽

Mehrnaz Tahmasbi ◽

Robert A. Augsburger ◽

Madhu Nair ◽

Matthew J. Kesterke ◽

...

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Field Of View ◽

Cone Beam

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Cone-Beam Computed Tomography Allows Accurate Registration to Surgical Navigation Systems: A Multidevice Phantom Study

American Journal of Rhinology and Allergy ◽

10.1177/1945892419861849 ◽

2019 ◽

Vol 33 (6) ◽

pp. 691-699 ◽

Cited By ~ 1

Author(s):

Benjamin J. Talks ◽

Karan Jolly ◽

Hanna Burton ◽

Hitesh Koria ◽

Shahzada K. Ahmed

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Surgical Navigation ◽

Imaging Modality ◽

Field Of View ◽

Cone Beam ◽

Navigation Systems ◽

Registration Error ◽

Surgical Navigation Systems ◽

Phantom Head

Background Cone-beam computed tomography (CBCT) is a fast imaging technique with a substantially lower radiation dosage than conventional multidetector computed tomography (MDCT) for sinus imaging. Surgical navigation systems are increasingly being used in endoscopic sinus and skull base surgery, reducing perioperative morbidity. Objective To investigate CBCT as a low-radiation imaging modality for use in surgical navigation. Methods The required field of view was measured from the tip of the nose to the posterior clinoid process anteroposteriorly and the nasolabial angle to the roof of the frontal sinus superoinferiorly on 50 consecutive MDCT scans (male = 25; age = 17–85 years). A phantom head was manufactured by 3-dimensional printing and imaged using 3 CBCT scanners (Carestream, J Morita, and NewTom), a conventional MDCT scanner (Siemens), and highly accurate laser scanner (FARO). The phantom head was registered to 3 surgical navigation systems (Brainlab, Stryker, and Medtronic) using scans from each system. Results The required field of view (mean ± standard deviation) was measured as 107 ± 7.6 mm anteroposteriorly and 90.3 ± 9.6 mm superoinferiorly. Image error deviations from the laser scan (median ± interquartile range) were comparable for MDCT (0.19 ± 0.09 mm) and CBCT (CBCT 1: 0.15 ± 0.11 mm; CBCT 2: 0.33 ± 0.18 mm; and CBCT 3: 0.13 ± 0.13 mm) scanners. Fiducial registration error and target registration error were also comparable for MDCT- and CBCT-based navigation. Conclusion CBCT is a low-radiation preoperative imaging modality suitable for use in surgical navigation.

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Effect of Cone-Beam Computed Tomography Field of View and Acquisition Frame on the Detection of Chemically Simulated Peri-Implant Bone Loss In Vitro

Journal of Periodontology ◽

10.1902/jop.2015.150223 ◽

2015 ◽

Vol 86 (10) ◽

pp. 1159-1165 ◽

Cited By ~ 19

Author(s):

Lucas Rodrigues Pinheiro ◽

William C. Scarfe ◽

Marcelo Augusto de Oliveira Sales ◽

Bruno Felipe Gaia ◽

Arthur Rodriguez Gonzalez Cortes ◽

...

Keyword(s):

Computed Tomography ◽

Bone Loss ◽

Cone Beam Computed Tomography ◽

Field Of View ◽

Cone Beam

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Monte-Carlo scatter correction for cone-beam computed tomography with limited scan field-of-view

10.1117/12.771103 ◽

2008 ◽

Cited By ~ 7

Author(s):

Matthias Bertram ◽

Timo Sattel ◽

Steffen Hohmann ◽

Jens Wiegert

Keyword(s):

Computed Tomography ◽

Monte Carlo ◽

Cone Beam Computed Tomography ◽

Scatter Correction ◽

Field Of View ◽

Cone Beam

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Cone-Beam Computed Tomography and Radiographs in Dentistry: Aspects Related to Radiation Dose

International Journal of Dentistry ◽

10.1155/2012/813768 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10 ◽

Cited By ~ 38

Author(s):

Diego Coelho Lorenzoni ◽

Ana Maria Bolognese ◽

Daniela Gamba Garib ◽

Fabio Ribeiro Guedes ◽

Eduardo Franzotti Sant’Anna

Keyword(s):

Computed Tomography ◽

Image Quality ◽

Radiation Dose ◽

Cone Beam Computed Tomography ◽

Field Of View ◽

Cone Beam ◽

Special Focus ◽

Radiation Doses ◽

Lower Effective Dose ◽

Plain Radiographs

Introduction. The aim of this study was to discuss the radiation doses associated with plain radiographs, cone-beam computed tomography (CBCT), and conventional computed tomography (CT) in dentistry, with a special focus on orthodontics.Methods. A systematic search for articles was realized by MEDLINE from 1997–March 2011.Results. Twenty-seven articles met the established criteria. The data of these papers were grouped in a table and discussed.Conclusions. Increases in kV, mA, exposure time, and field of view (FOV) increase the radiation dose. The dose for CT is greater than other modalities. When the full-mouth series (FMX) is performed with round collimation, the orthodontic radiographs transmit higher dose than most of the large FOV CBCT, but it can be reduced if used rectangular collimation, showing lower effective dose than large FOV CBCT. Despite the image quality, the CBCT does not replace the FMX. In addition to the radiation dose, image quality and diagnostic needs should be strongly taken into account.

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