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3D CBCT imaging

Mike R Bueno, Carlos Estrela, Brunno C Azevedo, Anibal Diogenes
Cone-beam computed tomography (CBCT) has promoted changes in approaches in Endodontics, and enhanced decision-making in complex clinical cases. Despite the technological advancements in CBCT hardware, the interpretation of the acquired images is still compromised by viewing software packages that often have limited navigational tools and lack adequate filters to overcome some challenges of the CBCT technology such as artefacts. This study reviews the current limitations of CBCT and the potential of a new CBCT software package (e-Vol DX, CDT- Brazil) to overcome these aspects and support diagnosing, planning and managing of endodontic cases...
November 2018: Brazilian Dental Journal
C Koç, K Kamburoğlu, G Sönmez, F Yılmaz, O Gülen, S Karahan
AIM: To assess observer performance in detecting endodontic complications using three different CBCT units with and without the application of artefact reduction modes. METHODOLOGY: The study involved 40 freshly extracted human mandibular teeth (n=10 per group) and divided randomly into four endodontic complication groups. Group 1) Instrument fracture; Group 2) Strip perforation; Group 3) Canal underfilling; Group 4) Canal overfilling. Images of each tooth were obtained using three different CBCT units offering artefact reduction algorithms: the ProMax 3D Max, the Pax Flex 3D, and the Dentri S...
December 2, 2018: International Endodontic Journal
Shereef Shahen, Manuel O Lagravère, Gennaro Carrino, Fady Fahim, Reham Abdelsalam, Carlos Flores-Mir, Letizia Perillo
BACKGROUND: Reproducible and descriptive Three-dimensional treatment evaluation can enhance future treatment based on realistic results. So, the purpose of this study was to describe a new method for three-dimensional treatment evaluation showing how to use fully-automated craniofacial superimposition of CBCT records combined with reference system to obtain descriptive and comparable results. This new method was named United Reference Method (URM). METHODS: URM is a combination of automated 3D superimposition on anterior cranial base surface anatomy and measurements based on reference system...
December 3, 2018: Progress in Orthodontics
Fahrettin Kalabalık, Elif Tarım Ertaş
OBJECTIVES: The aim of this retrospective study was to investigate the correlations of maxillary sinus volume with nasal septal deviation, concha bullosa, impacted teeth, and missing teeth in the maxillary posterior region on maxillary sinus volume using cone-beam computed tomography (CBCT) images. METHODS: The study cohort comprised 252 CBCT images of 252 patients retrospectively selected from the records in our CBCT archive. All CBCT images were exported to 3D modeling software for calculation of maxillary sinus volumes...
November 24, 2018: Oral Radiology
Takafumi Hayashi, Yoshinori Arai, Toru Chikui, Sachiko Hayashi-Sakai, Kazuya Honda, Hiroko Indo, Taisuke Kawai, Kaoru Kobayashi, Shumei Murakami, Masako Nagasawa, Munetaka Naitoh, Eiji Nakayama, Yutaka Nikkuni, Hideyoshi Nishiyama, Noriaki Shoji, Shigeaki Suenaga, Ray Tanaka
Dental cone-beam computed tomography (CBCT) received regulatory approval in Japan in 2000 and has been widely used since being approved for coverage by the National Health Insurance system in 2012. This imaging technique allows dental practitioners to observe and diagnose lesions in the dental hard tissue in three dimensions (3D). When performing routine radiography, the examination must be justified, and optimal protection should be provided according to the ALARA (as low as reasonably achievable) principles laid down by the International Commission on Radiological Protection...
May 2018: Oral Radiology
Abdurahman H Alwadei, Maria Therese S Galang-Boquiren, Budi Kusnoto, Maria Grace Costa Viana, Edward Y Lin, Ales Obrez, Carla A Evans, Ahmed I Masoud
INTRODUCTION: Identifying the location and value of the smallest airway dimension can be useful in screening and planning treatment for patients with obstructive sleep apnea. Our objectives in this study were to (1) objectively identify the vertical location and value of the minimum sagittal linear dimension (MSLD) on 2-dimensional reconstructed lateral cephalograms (RLCs), (2) compare the location and value of the MSLD on RLCs with the vertical location and sagittal dimension of the minimum cross-sectional area (MCSA), and (3) investigate the association between the MSLD on RLCs and both the MCSA and the airway volume...
December 2018: American Journal of Orthodontics and Dentofacial Orthopedics
P López-Jarana, C M Díaz-Castro, A Falcão, C Falcão, J V Ríos-Santos, M Herrero-Climent
BACKGROUND: The objective of this paper is to anatomically describe the bone morphology in the maxillary and mandibular tooth areas, which might help in planning post-extraction implants. METHODS: CBCT images (Planmeca ProMax 3D) of 403 teeth (208 upper teeth and 195 lower teeth) were obtained from 49 patients referred to the Dental School of Seville from January to December 2014. The thickness of the facial wall was measured at the crest, point A, 4 mm below, point B, and at the apex, point C...
November 21, 2018: BMC Oral Health
Cesar de Cesar Netto, Delaram Shakoor, Lauren Roberts, Apisan Chinanuvathana, Alireza Mousavian, Francois Lintz, Lew C Schon, Shadpour Demehri
BACKGROUND: Clinical assessment of hindfoot alignment (HA) in adult acquired flatfoot deformity (AAFD) can be challenging and weightbearing (WB) cone beam CT (CBCT) may potentially better demonstrate this three-dimensional (3D) deformity. Therefore, we compared clinical and WB CBCT assessment of HA in patients with AAFD. METHODS: In this prospective study, we included 12 men and 8 women (mean age: 52.2, range: 20-88) with flexible AAFD. All subjects also underwent WB CBCT and clinical assessment of hindfoot alignment...
November 5, 2018: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
You Zhang, Michael R Folkert, Bin Li, Xiaokun Huang, Jeffrey J Meyer, Tsuicheng Chiu, Pam Lee, Joubin Nasehi Tehrani, Jing Cai, David Parsons, Xun Jia, Jing Wang
PURPOSE: To improve the accuracy of liver tumor localization, this study tests a biomechanical modeling-guided liver cone-beam CT (CBCT) estimation (Bio-CBCT-est) technique, which generates new CBCTs by deforming a prior high-quality CT or CBCT image using deformation vector fields (DVFs). The DVFs can be used to propagate tumor contours from the prior image to new CBCTs for automatic 4D tumor localization. METHODS/MATERIALS: To solve the DVFs, the Bio-CBCT-est technique employs an iterative scheme that alternates between intensity-driven 2D-3D deformation and biomechanical modeling-guided DVF regularization and optimization...
November 14, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Josipa Radic, Raphael Patcas, Bernd Stadlinger, Daniel Wiedemeier, Martin Rücker, Barbara Giacomelli-Hiestand
BACKGROUND: The aim of this study was to assess the diagnostic accuracy of various dentoalveolar pathologies based on panoramic radiography (OPG), cone beam computed tomography (CBCT) and printed 3D models in consecutive order; and to evaluate the impact of specialisation of residents in oral surgery (OS) versus residents in orthodontics (ORTH). METHODS: Fourteen residents were recruited to evaluate nine selected cases with different dentoalveolar pathologies. The residents were given for each case an OPG, a CBCT and a printed 3D model...
November 16, 2018: International Journal of Implant Dentistry
Alycia Sam, Kris Currie, Heesoo Oh, Carlos Flores-Mir, Manuel Lagravere-Vich
OBJECTIVES: Conventional two-dimensional (2D) cephalometric radiography is an integral part of orthodontic patient diagnosis and treatment planning. One must be mindful of its limitations as it indeed is a 2D representation of a vaster three-dimensional (3D) object. Issues with projection errors, landmark identification, and measurement inaccuracies impose significant limitations, which may now be overcome with the advent of cone-beam computed tomography (CBCT). A systematic review of the reliability of different 3D cephalometric landmarks in CBCT imaging was conducted...
November 13, 2018: Angle Orthodontist
R Lo Giudice, F Nicita, F Puleio, A Alibrandi, G Cervino, A S Lizio, G Pantaleo
Introduction: A radiological evaluation is essential in endodontics, for diagnostic purposes, planning and execution of the treatment, and evaluation of the success of therapy. The periapical radiography is nowadays the main radiographic investigations used but presents some limits as 3D anatomic alteration, geometric compression, and possible anatomical structures overlapping that can obscure the area of interest. CBCT (cone beam computed tomography) in endodontics allows a detailed assessment of the teeth and surrounding alveolar anatomy for endodontic diagnosis, treatment planning, and follow-up...
2018: International Journal of Dentistry
Giasemi Koutouzi, Behrooz Nasihatkton, Monika Danielak-Nowak, Henrik Leonhardt, Mårten Falkenberg, Fredrik Kahl
BACKGROUND: A crucial step in image fusion for intraoperative guidance during endovascular procedures is the registration of preoperative computed tomography angiography (CTA) with intraoperative Cone Beam CT (CBCT). Automatic tools for image registration facilitate the 3D image guidance workflow. However their performance is not always satisfactory. The aim of this study is to assess the accuracy of a new fully automatic, feature-based algorithm for 3D3D registration of CTA to CBCT. METHODS: The feature-based algorithm was tested on clinical image datasets from 14 patients undergoing complex endovascular aortic repair...
November 8, 2018: BMC Medical Imaging
Zhikai Liu, Xia Liu, Fuquan Zhang, Ke Hu
Background and purpose: Image guided radiotherapy (IGRT) without 6 degree of freedom couch can only correct the translational setup errors of pelvic radiotherapy. But errors introduced by rotation and deformation of CTV can't be adjusted in most of IGRT systems. This article is to evaluate these errors and to provide recommendations on the margin needed in the era of IGRT. Material and methods: 218 patients who received pelvic radiotherapy in PUMC Hospital from 2012 to 2014 were included. A simulation CT and a CBCT were acquired for every patient...
2018: Journal of Cancer
Dries De Mulder, Maria Cadenas de Llano-Pérula, Guy Willems, Reinhilde Jacobs, Jakob Titiaan Dormaar, Anna Verdonck
The objective was to present an optimized imaging protocol for orofacial cleft (OFC) patients, which might be used as an international recommendation for OFC care programs. The present radiological protocol has been structured by the OFC team of the University Hospitals Leuven based on a combined approach of clinical experience and scientific evidence. The development was based on careful monitoring of the existing needs for radiological diagnosis by the involved disciplines. Needs were revised by expert consensus and radiological optimization...
October 2018: Clinical and Experimental Dental Research
Pengpeng Zhang, Margie Hunt, Arina B Telles, Hai Pham, Michael Lovelock, Ellen Yorke, Guang Li, Laura Happersett, Andreas Rimner, Gig Mageras
PURPOSE: Localizing lung tumors during treatment delivery is critical for managing respiratory motion, ensuring tumor coverage and reducing toxicities. The purpose of this project is to develop a real-time system that performs markerless tracking of lung tumors using simultaneously acquired MV and kV images during radiotherapy of lung cancer with volumetric modulated arc therapy. METHOD: Continuous MV/kV images were simultaneously acquired during dose delivery. In the subsequent analysis, a gantry angle-specific region of interest was defined according to the treatment aperture...
October 25, 2018: Medical Physics
Jorge Javier de Lima Moreno, Gabriela Salatino Liedke, Roberto Soler, Heloisa Emília Dias da Silveira, Heraldo Luis Dias da Silveira
Objectives: To compare reconstructed area and surface roughness of 3D models acquired using nine image acquisition protocols. Radiation dose was also compared among acquisition protocols. Methods: A dry craniofacial specimen was scanned using three CT devices (a cone beam CT, a 16-channel fan beam CT, and a 64-channel fan beam CT), with three different acquisition protocols each. Nine 3D models were manufactured using polylactic acid. Surface roughness and reconstructed area were determined for each 3D model...
December 2018: Journal of Maxillofacial and Oral Surgery
Iman Asaria, Manuel O Lagravère
INTRODUCTION: To identify changes in the adolescent mandibular canal (MC) using cone-beam computer tomography (CBCT) by locating three-dimensional (3D) anatomical landmarks in the mandible for later growth and treatment applications. METHODS: Two CBCT images taken 1.5-2 years apart for 50 patients (ages 11-17) were landmarked using AVIZO® . Six core landmarks were placed relative to the right and left MCs. Three-dimensional coordinates (x, y, z) were obtained. Average distances between paired landmarks were measured using a paired samples t-test...
December 2018: International Orthodontics
J Heinz, K Stewart, A Ghoneima
Superimposition of radiographic imaging is used to evaluate patient growth and the effects of surgical and/or orthodontic treatment. The purpose of this study was to compare the outcomes of superimposition between two-dimensional (2D) and three-dimensional (3D) superimpositions. 2D lateral cephalograms were generated from the initial and final cone beam computed tomography scans (CBCT) of 18 patients and superimposed. Both 3D CBCT and 2D CBCT generated lateral cephalograms were oriented to the Frankfort horizontal plane and superimposed according to the American Board of Orthodontics recommendations...
October 17, 2018: International Journal of Oral and Maxillofacial Surgery
Niral M Sheth, Wojciech Zbijewski, Matthew W Jacobson, Godwin Abiola, Gerhard Kleinszig, Sebastian Vogt, Stefan Soellradl, Jens Bialkowski, William S Anderson, Clifford R Weiss, Greg M Osgood, Jeffrey H Siewerdsen
PURPOSE: Indirect-detection CMOS flat-panel detectors (FPDs) offer fine pixel pitch, fast readout, and low electronic noise in comparison to current a-Si:H FPDs. This work investigates the extent to which these potential advantages affect imaging performance in mobile C-arm fluoroscopy and cone-beam CT (CBCT). METHODS: FPDs based on CMOS (Xineos 3030HS, 0.151 mm pixel pitch) or a-Si:H (PaxScan 3030X, 0.194 mm pixel pitch) sensors were outfitted on equivalent mobile C-arms for fluoroscopy and CBCT...
October 19, 2018: Medical Physics
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