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3D CBCT imaging

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https://read.qxmd.com/read/30776788/mcsart-an-iterative-model-based-motion-compensated-sart-algorithm-for-cbct-reconstruction
#1
Geraldine Chee, Dylan O'Connell, Youming Yang, Kamal Singhrao, Daniel A Low, John H Lewis
4D cone beam computed tomography (CBCT) images of the thorax and abdomen can have reduced quality due to the limited number of projections per respiratory bin used in gated image reconstruction. In this work, we present a new algorithm to reconstruct high quality CBCT images by simultaneously reconstructing images and generating an associated respiratory motion model. This is done by updating model parameters to compensate for motion during the iterative image reconstruction process. CBCT image acquisition was simulated using the digital eXternal CArdiac Torso (XCAT) phantom, simulating breathing motion using four patient breathing traces...
February 18, 2019: Physics in Medicine and Biology
https://read.qxmd.com/read/30775059/usefulness-of-preoperative-cone-beam-computed-tomography-and-intraoperative-digital-subtraction-angiography-for-dural-arteriovenous-fistula-at-craniocervical-junction-technical-case-report
#2
Nobuhide Hayashi, Nagatsuki Tomura, Hideo Okada, Takahiro Sasaki, Eisaku Tsuji, Hiroki Enomoto, Toshikazu Kuwata
Background: Direct surgery is commonly selected for the treatment of cranio-cervical junction dural arteriovenous fistula and its outcome is more satisfactory than that of embolization. Intraoperative treatment evaluation is relatively easy in embolization, whereas in direct surgery it can be difficult. Case Description: A 67-year-old male suffered a subarachnoid hemorrhage. On three-dimensional (3D) images of preoperational cone-beam computed tomography (CBCT), the structure of the draining vein was depicted in detail along with the surrounding bone structures...
2019: Surgical Neurology International
https://read.qxmd.com/read/30773548/-diagnostic-accuracy-of-cone-beam-computed-tomography-with-different-resolution-settings-for-external-root-resorption
#3
X Y Xie, S M Jia, Z H Sun, Z Y Zhang
OBJECTIVE: To evaluate the diagnostic accuracy of cone beam computed tomography (CBCT) with different resolution settings in detecting the simulated external root resorption defects. METHODS: External root resorption defects were simulated in 51 human single rooted premolar teeth. Cavities simulating root resorption defects of 1 mm in diameter and 0.1 mm, 0.2 mm, and 0.3 mm in depth were drilled in the cervical, middle and apical thirds of lingual surfaces of the teeth...
February 18, 2019: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://read.qxmd.com/read/30772110/simulation-based-deep-artifact-correction-with-convolutional-neural-networks-for-limited-angle-artifacts
#4
A-K Schnurr, K Chung, T Russ, L R Schad, F G Zöllner
Non-conventional scan trajectories for interventional three-dimensional imaging promise low-dose interventions and a better radiation protection to the personnel. Circular tomosynthesis (cTS) scan trajectories yield an anisotropical image quality distribution. In contrast to conventional Computed Tomographies (CT), the reconstructions have a preferred focus plane. In the other two perpendicular planes, limited angle artifacts are introduced. A reduction of these artifacts leads to enhanced image quality while maintaining the low dose...
February 13, 2019: Zeitschrift Für Medizinische Physik
https://read.qxmd.com/read/30770332/effects-of-mechanical-vibration-on-miniscrew-implants-and-bone-fem-analysis
#5
Aylin Pasaoglu Bozkurt
OBJECTIVE: The aim of this FEM study was to assess the effect of mechanical vibration force on miniscrews and stress distribution in cortical and trabecular bone around miniscrews. METHODS: A 3D model was created using a CBCT image of a patient. Three different analyses were performed on a single model. Material properties, boundary conditions and the quality of applied forces (direction and magnitude) were defined. 150 gf, 150 gf and 30Hz (0.2N), 150 gf and 111Hz (0...
February 12, 2019: International Orthodontics
https://read.qxmd.com/read/30770279/the-impact-of-different-diagnostic-imaging-modalities-on-the-evaluation-of-root-canal-anatomy-and-endodontic-residents-stress-levels-a-clinical-study
#6
Shanon Patel, Risha Patel, Federico Foschi, Franceso Mannocci
INTRODUCTION: The purpose of this study was firstly to compare the impact of radiographs, cone-beam computed tomographic (CBCT) imaging, and 3D Endo software (Dentsply Sirona, Ballaigues, Switzerland) on the assessment of root canal anatomy and radiographic quality of endodontic treatment and secondly to assess stress levels in the same cohort of residents performing endodontic treatment. METHODS: Sixty patients requiring primary molar endodontic treatment were allocated randomly into 3 groups: group 1 (n = 20), conventional radiographs (periapical radiography [PR]) only; group 2 (n = 20), PR and CBCT imaging; and group 3 (n = 20), PR, CBCT imaging, and 3D Endo software...
February 12, 2019: Journal of Endodontics
https://read.qxmd.com/read/30763782/maxillary-shape-after-primary-cleft-closure-and-before-alveolar-bone-graft-in-two-different-management-protocols-a-comparative-morphometric-study
#7
F Girinon, S Ketoff, Q Hennocq, N Kogane, N Ullman, N Kadlub, E Galliani, C Neiva-Vaz, M P Vazquez, A Picard, R H Khonsari
AIM AND SCOPE: Result assessment in cleft surgery is a technical challenge and requires the development of dedicated morphometric tools. Two cohorts of patients managed according to two different protocols were assessed at similar ages and their palatal shape was compared using geometric morphometrics. Material and Methods Ten patients (protocol №1) benefited from early lip closure (1-3 months) and secondary combined soft and hard palate closure (6-9 months); 11 patients (protocol №2) benefited from later combined lip and soft palate closure (6 months) followed by hard palate closure (18 months)...
February 11, 2019: Journal of Stomatology, Oral and Maxillofacial Surgery
https://read.qxmd.com/read/30758848/2d-and-3d-radiographic-outcome-assessment-of-the-effect-of-guided-tissue-regeneration-using-resorbable-collagen-membrane-in-the-healing-of-through-and-through-periapical-lesions-a-randomized-controlled-trial
#8
P D Parmar, R Dhamija, S Tewari, P Sangwan, A Gupta, J Duhan, S Mittal
AIM: To evaluate the effect of collagen membrane on the healing of through-and-through periapical lesions using 2-dimensional (2D) and 3-dimensional (3D) imaging techniques. METHODOLOGY: Thirty two patients with periapical radiolucencies measuring at least 10mm and with confirmed loss of buccal and lingual cortical plates were randomly divided into GTR and control groups. Periapical surgery was performed in both groups, using a resorbable collagen membrane in GTR group only...
February 13, 2019: International Endodontic Journal
https://read.qxmd.com/read/30725218/cone-beam-computed-tomography-evaluation-of-the-pterygomaxillary-fissure-and-pterygopalatine-fossa-using-3d-rendering-programs
#9
Murat Icen, Kaan Orhan
PURPOSE: The aim of this study was to investigate the detailed anatomy of the pterygomaxillary fissure (PMF) and pterygopalatine fossa (PPF) and variations therein using three-dimensional (3D) cone-beam computed tomography (CBCT) software. METHODS: This study was based on a retrospective evaluation of CBCT scans. A total of 825 CBCT images of patients (448 females, 377 males) who met the inclusion criteria were analyzed. PMF shapes were classified, and morphometric measurements (PMF area and PPF volume) were performed according to age, right/left side, and gender using 3D rendering programs...
February 6, 2019: Surgical and Radiologic Anatomy: SRA
https://read.qxmd.com/read/30725217/prevalence-of-anatomical-variants-in-the-clivus-fossa-navicularis-magna-canalis-basilaris-medianus-and-craniopharyngeal-canal
#10
Seval Bayrak, Duygu Göller Bulut, Kaan Orhan
PURPOSE: This study determined the prevalence of fossa navicularis magna (FNM), canalis basilaris medianus (CBM), and craniopharyngeal canal (CPC), the size of FNMs, and types of CBM using 3D computed tomography (CT) images. METHODS: A total of 1059 3D images [649 cone beam computed tomography (CBCT) and 410 CT] were evaluated in this study. The prevalence of FNM, CBM, and CPC, length, width, and depth of FNM, and type of CBM were assessed. RESULTS: Overall, FNM was identified in 7...
February 6, 2019: Surgical and Radiologic Anatomy: SRA
https://read.qxmd.com/read/30723944/a-data-efficient-method-for-local-noise-power-spectrum-nps-estimation-in-fdk-reconstructed-3d-cone-beam-ct
#11
Rongping Zeng, Mahsa Torkaman, Holly Ning, Ying Zhuge, Robert Miller, Kyle J Myers
PURPOSE: For CT systems in which noise is nonstationary, a local NPS is often needed to characterize its noise property. We have previously developed a data-efficient radial NPS method to estimate the two-dimensional (2D) local NPS for FBP reconstructed fan-beam CT utilizing the polar separability of CT NPS[1]. In this work we extend this method to estimate three-dimensional (3D) local NPS for FDK-reconstructed cone-beam CT (CBCT) volumes. METHODS: Starting from the 2D polar separability, we analyze the CBCT geometry and FDK image reconstruction process to derive the 3D expression of the polar separability for CBCT local NPS...
February 5, 2019: Medical Physics
https://read.qxmd.com/read/30716145/bone-volume-assessment-around-dental-implants-after-open-maxillary-sinus-elevation-surgery-a-quantitative-approach-to-cbct-images
#12
Susanne Lewin, Christopher Riben, Andreas Thor, Caroline Öhman-Mägi
PURPOSE: Cone beam computed tomography (CBCT) is an important imaging technique in maxillofacial evaluations. However, application-specific image analysis methods aimed at extracting quantitative information from these images need to be further developed. The aim of this study was to provide a robust and objective method that could assess radiologic changes around dental implants after sinus elevation surgery with simultaneous implant placement. MATERIALS AND METHODS: The study was performed retrospectively on patients fulfilling the inclusion criteria...
February 4, 2019: International Journal of Oral & Maxillofacial Implants
https://read.qxmd.com/read/30713816/a-new-segmentation-algorithm-for-measuring-cbct-images-of-nasal-airway-a-pilot-study
#13
Chen Zhang, Robin Bruggink, Frank Baan, Ewald Bronkhorst, Thomas Maal, Hong He, Edwin M Ongkosuwito
Background: Three-dimensional (3D) modeling of the nasal airway space is becoming increasingly important for assessment in breathing disorders. Processing cone beam computed tomography (CBCT) scans of this region is complicated, however, by the intricate anatomy of the sinuses compared to the simpler nasopharynx. A gold standard for these measures also is lacking. Previous work has shown that software programs can vary in accuracy and reproducibility outcomes of these measurements. This study reports the reproducibility and accuracy of an algorithm, airway segmentor (AS), designed for nasal airway space analysis using a 3D printed anthropomorphic nasal airway model...
2019: PeerJ
https://read.qxmd.com/read/30710466/first-experiences-with-the-airo%C3%A2-mobile-intraoperative-ct-scanner-in-acetabular-surgery-an-analysis-of-10-cases
#14
H Keil, N Beisemann, M Schnetzke, S Y Vetter, P A Grützner, J Franke
BACKGROUND: Being a proven method in trauma and spine surgery, intraoperative 3D imaging (CBCT) has intrinsic deficits in difficult anatomy and with artifacts due to metal implants. The purpose of this study was to evaluate the use of intraoperative computed tomography (iCT) in acetabular surgery. METHODS: 10 cases of acetabular fractures that were operated with intraoperative use of the mobile CT scanner Brainlab Airo® were analyzed. Data were compared to a historical group of 17 patients...
February 2, 2019: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://read.qxmd.com/read/30708356/towards-patient-connected-imaging-with-acrobeat-adaptive-cardiac-cone-beam-computed-tomography
#15
Tess Reynolds, Chun-Chien Shieh, Paul J Keall, Ricky T O'Brien
Robotic C-arm Cone Beam Computed Tomography (CBCT) systems are playing an increasingly pivotal role in interventional cardiac procedures and high precision radiotherapy treatments. One of the main challenges in any form of cardiac imaging is mitigating the intrinsic motion of the heart, which causes blurring and artefacts in the 3D reconstructed image. Most conventional 3D cardiac CBCT acquisition techniques attempt to combat heart motion through retrospective gating techniques, whereby acquired projections are sorted into the desired cardiac phase after the completion of the scan...
February 1, 2019: Physics in Medicine and Biology
https://read.qxmd.com/read/30697376/multidisciplinary-oral-rehabilitation-in-partially-edentulous-adult-patients-with-malocclusion-a-cross-sectional-survey-study
#16
Renan Devita, Sérgio Pinho, Josep-Maria Ustrell, Henrique Pretti, Esdras-de Campos França, Ertty Silva, Igor Brum
Background: A cross-sectional survey was conducted to gather information regarding the opinion of Brazilian specialists in both orthodontics and implantology on multidisciplinary oral rehabilitation in partially edentulous patients with malocclusion. Material and Methods: A total of 305 specialists participated in a telephone survey and answered an ad hoc 10-item questionnaire, including the request of total skull cone-beam tomographies (CBCT) and the use of 3D digital planning software, the best moment of treatment to place dental implants, and the integration of orthodontics in implantology...
December 2018: Journal of Clinical and Experimental Dentistry
https://read.qxmd.com/read/30687628/preoperative-imaging-for-breast-conservation-surgery-do-we-need-more-than-conventional-imaging-for-local-disease-assessment
#17
REVIEW
Eugene Ong
Breast conservation surgery (BCS) is offered for early breast cancer. Conventional imaging with mammography and ultrasound would have been performed prior to surgery. This article considers other imaging modalities available [such as 3D tomosynthesis, magnetic resonance imaging (MRI), contrast-enhanced spectral mammography, positron emission mammography (PEM), breast-specific gamma imaging (BSGI) and cone beam computed tomography (CBCT)] and discusses the evidence for these in terms of diagnostic accuracy and clinical outcomes...
December 2018: Gland Surgery
https://read.qxmd.com/read/30677233/radiation-dose-and-image-quality-comparison-during-spine-surgery-with-two-different-intraoperative-3d-imaging-navigation-systems
#18
Rami Nachabe, Keith Strauss, Beth Schueler, Mohamad Bydon
Careful protocol selection is required during intraoperative three-dimensional (3D) imaging for spine surgery to manage patient radiation dose and achieve clinical image quality. Radiation dose and image quality of a Medtronic O-arm commonly used during spine surgery, and a Philips hybrid operating room equipped with XperCT C-arm 3D cone-beam CT (hCBCT) are compared. The mobile O-arm (mCBCT) offers three different radiation dose settings (low, standard, and high), for four different patient sizes (small, medium, large, and extra large)...
January 24, 2019: Journal of Applied Clinical Medical Physics
https://read.qxmd.com/read/30675902/characterization-of-a-prototype-rapid-kilovoltage-x-ray-image-guidance-system-designed-for-a-ring-shape-radiation-therapy-unit
#19
Bin Cai, Eric Laugeman, Thomas R Mazur, Justin C Park, Lauren E Henke, Hyun Kim, Geoffrey D Hugo, Sasa Mutic, Hua Li
PURPOSE: This study aims to characterize the performance of a prototype rapid kilovoltage (kV) X-ray image guidance system on-board the newly released Halcyon 2.0 linear accelerator (Varian Medical Systems) by use of conventional and innovatively designed testing procedures. METHODS: Basic imaging system performance tests and radiation dose measurements were performed for all eleven kV cone beam computed tomography (CBCT) imaging protocols available on a pre-clinical Halcyon 2...
January 24, 2019: Medical Physics
https://read.qxmd.com/read/30661246/accuracy-of-detecting-vertical-root-fractures-in-non-root-filled-teeth-using-cone-beam-computed-tomography-effect-of-voxel-size-and-fracture-width
#20
X L Guo, G Li, J Q Zheng, R H Ma, F C Liu, F S Yuan, P J Lyu, Y J Guo, S Yin
AIM: To investigate simultaneously the effect of voxel size and fracture width on the accuracy of detecting vertical root fractures (VRF) in non-root filled teeth when using cone beam computed tomography. METHODOLOGY: Fifty-one of 161 extracted human permanent teeth (16 anterior teeth, 132 premolars, 13 mandibular molars) were selected randomly for VRF induction with two fracture widths. All teeth were scanned with four CBCT units at different voxel sizes provided by the units...
January 20, 2019: International Endodontic Journal
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