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3D CBCT imaging

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https://www.readbyqxmd.com/read/30109301/cbct-vs-other-imaging-modalities-to-assess-peri-implant-bone-and-diagnose-complications-a-systematic-review
#1
Reinhilde Jacobs, Myrthel Vranckx, Tony Vanderstuyft, Marc Quirynen, Benjamin Salmon
AIM: The objective of this systematic review was to evaluate the diagnostic value of CBCT compared with 2D imaging and clinical gold standard techniques in peri-implant bone defect detection and measurement. MATERIALS AND METHODS: Literature search was performed using MEDLINE, Embase and Web of Science databases up to July 2017. Clinical, ex vivo, in vitro and animal studies that assessed and measured peri-implant bone defects using different imaging modalities were included in this review...
2018: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/30107037/assessment-of-artefacts-produced-by-metal-posts-on-cbct-images
#2
A P Lira de Farias Freitas, Y Wanderley Cavalcanti, F C Mariz da Costa, L Rangel Peixoto, A M Araújo Maia, K Rovaris Silva, P Meira Bento, D Pita de Melo
AIM: To evaluate the artefact intensity in CBCT images of two alloys used in metal posts scanned using different exposure parameters. METHODOLOGY: The sample consisted of 20 single-rooted teeth divided into two groups for use with either a NiCr post or AgPd post. All teeth were scanned with and without their corresponding metal posts and with and without the presence of an extra restored tooth in the arch. The samples were scanned using CS 9000 3D scanner with two exposure protocols: 85kV 6...
August 14, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/30106718/cbct-of-a-moving-sample-from-x-rays-and-multiple-videos
#3
Julien Pansiot, Edmond Boyer
In this paper we consider dense volumetric modeling of moving samples such as body parts. Most dense modeling methods consider samples observed with a moving X-ray device and cannot easily handle moving samples. We propose instead a novel method to observe shape motion from a fixed X-ray device and to build dense in-depth attenuation information. This yields a low-cost, low-dose 3D imaging solution, taking benefit of equipment widely available in clinical environments. Our first innovation is to combine a video-based surface motion capture system with a single low-cost/low-dose fixed planar X-ray device, in order to retrieve the sample motion and attenuation information with minimal radiation exposure...
August 13, 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/30099748/methods-for-measurement-of-root-canal-curvature-a-systematic-and-critical-review
#4
REVIEW
R C Hartmann, M Fensterseifer, O A Peters, J A P de Figueiredo, Gomes, G Rossi-Fedele
The assessment of root canal curvature is essential for clinical and research purposes. This systematic review presents an overview of the published techniques for the measurement of root canal curvature features using imaging, and to provide a critique of their clinical application. A database search in PubMed, PubMed Central, Embase, Scopus, EBSCO Dentistry & Oral Sciences Source and Virtual Health Library was conducted, using appropriate key words to identify measurement methods for root canal curvatures...
August 11, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/30080126/correlation-between-the-cross-sectional-morphology-of-the-mandible-and-the-three-dimensional-facial-skeletal-pattern-a-structural-equation-modeling-approach
#5
Mi So Ahn, Sang Min Shin, Te-Ju Wu, Dong Joon Lee, Ching-Chang Ko, Chooryung J Chung, Yong-Il Kim
OBJECTIVE: To clarify the relationship between the cross-sectional morphology of the mandible and vertical, transverse, and anteroposterior facial skeletal patterns using statistical shape analysis and structural equation modeling (SEM). MATERIALS AND METHODS: We used 150 cone beam computed tomography (CBCT) images to obtain three-dimensional (3D) facial landmarks and cross-sectional images of the mandible. The morphology of the inner and outer cortices of the mandible was analyzed using statistical shape analysis, including generalized Procrustes analysis and principal component analysis (PCA)...
August 3, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/30057609/assessing-the-correlation-between-skeletal-and-corresponding-soft-tissue-equivalents-to-determine-the-relationship-between-cbct-skeletal-dental-dimensions-and-3d-radiographic-soft-tissue-equivalents
#6
Da In Kim, Manuel O Lagravère
Objective: Compare measurements of skeletal and dental areas on the CBCT to the corresponding soft-tissue measures taken from a 3D Facial Scanner. Methods: 30 patients with CBCT and 3D Facial scanner photos were selected from the orthodontic program database. 30 different distance measurements were obtained from CBCT and facial scan. OrthoInsight software was used to obtain the measurements from the facial scan images, and AVIZO software was used for corresponding CBCT landmarks...
2018: International Journal of Dentistry
https://www.readbyqxmd.com/read/30048759/effects-of-the-highly-cox-2-selective-analgesic-nsaid-etoricoxib-on-the-rate-of-orthodontic-tooth-movement-and-cranial-growth
#7
Christian Kirschneck, Erika Calvano Küchler, Ulrich Wahlmann, Peter Proff, Agnes Schröder
BACKGROUND: NSAID analgesics have found widespread use in the treatment of pain, inflammation and fever. The highly COX-2-selective NSAID etoricoxib has shown a favorable side effect profile and excellent analgesic efficacy, particularly for dental and orthodontic pain, surpassing the current standard analgesic in orthodontics, acetaminophen. However, potential side effects on the rate of orthodontic tooth movement (OTM) and cranial growth, relevant for clinical usability during orthodontic treatment, have not yet been investigated...
July 23, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/30048758/morphofunctional-evaluation-of-buccopharyngeal-space-using-three-dimensional-cone-beam-computed-tomography-3d-cbct
#8
Marius Valeriu Hînganu, Delia Hînganu, Sebastian Romică Cozma, Cristina Asimionoaiei-Simionescu, Irina Andreea Scutariu, Dorin Savin Ionesi, Danisia Haba
The present study aims to identify the anatomical functional changes of the buccopharyngeal space in case of singers with canto voice. The interest in this field is particularly important in view of the relation between the artistic performance level, phoniatry and functional anatomy, as the voice formation mechanism is not completely known yet. We conducted a morphometric study on three soprano voices that differ in type and training level. The anatomical soft structures from the superior vocal formant of each soprano were measured on images captured using the Cone-beam Computed Tomography (CBCT) technique...
July 23, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/30046940/diagnostic-ability-of-limited-volume-cone-beam-computed-tomography-with-small-voxel-size-in-identifying-the-superior-and-inferior-walls-of-the-mandibular-canal
#9
Hiroko Ishii, Akemi Tetsumura, Yoshikazu Nomura, Shin Nakamura, Masako Akiyama, Tohru Kurabayashi
BACKGROUND: The aim of this study was to evaluate the visibility of the superior and inferior walls of the mandibular canal separately using limited volume cone beam computed tomography (CBCT) with small voxel size. METHODS: CBCT cross-sectional images of 86 patients obtained by 3D Accuitomo FPD and reconstructed with a voxel size of 0.08 mm were used for the evaluation. A 30-mm range of the mandible just distal to the mental foramen was divided into three equal areas (areas 1, 2, and 3, from anterior to posterior)...
July 26, 2018: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/30039255/a-novel-technique-of-cervical-pedicle-screw-placement-with-a-pilot-screw-under-the-guidance-of-intraoperative-3d-imaging-from-c-arm-cone-beam-ct-without-navigation-for-safe-and-accurate-insertion
#10
Masahiko Takahata, Katsuhisa Yamada, Iwata Akira, Tsutomu Endo, Hideki Sudo, Hidetoki Yokoyama, Norimasa Iwasaki
PURPOSE: The cervical pedicle screw (CPS) requires careful and accurate placement because of the critical risk for neurovascular injury. This study aimed to introduce and evaluate the safety and efficacy of a new CPS placement technique using intraoperative C-arm cone-beam CT (CBCT) and a pilot screw without navigation system. METHODS: This was a case-control study to compare the accuracy and safety of intraoperative C-arm CBCT-guided CPS placement with freehand CPS placement under lateral fluoroscopy using control data from a previous multicenter study...
July 23, 2018: European Spine Journal
https://www.readbyqxmd.com/read/30008233/-setup-margin-for-head-and-neck-cancer-patients-receiving-2d-2d-and-3d-image-guided-intensity-modulated-radiation-therapy
#11
Péter Kovács, Evelin Szita, Kitti Schvarcz, Szabolcs Kamu, Judit Kalincsák, Árpád Kovács, Imre Repa, Janaki Hadjiev
INTRODUCTION: Image-guided intensity-modulated radiation therapy is essential for oncology treatment of head-and-neck cancer patients. AIM: MV-kV and CBCT modalities were compared in case of IGRT treatment for head-and-neck cancer patients. Setup error, setup margin (SM), imaging and evaluation times and imaging doses were analyzed. METHOD: Eight patients' elective treatment was evaluated, 66 orthogonal MV-kV images and 66 CBCT series were acquired...
July 2018: Orvosi Hetilap
https://www.readbyqxmd.com/read/30006685/factors-influencing-the-effective-dose-associated-with-cbct-a-systematic-review
#12
Wilana da Silva Moura, Kelly Chiqueto, Gustavo Menezes Pithon, Leniana Santos Neves, Renata Castro, José Fernando Castanha Henriques
INTRODUCTION: Due to potential impact of the effects of ionizing radiation used in medical and dental examinations on public health in recent years, many studies are being conducted to quantify the radiation dose values, evaluate scanners, and indicate factors that could influence or reduce radiation doses. OBJECTIVES: This study aimed to evaluate, by a systematic review, the factors that influence the effective radiation dose associated with cone beam computed tomography and respective effects, and compared the effective dose of different cone beam computed tomography (CBCT) scanners with similar exposure parameters...
July 13, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29999253/validation-of-a-windowing-protocol-for-accurate-in-vivo-tooth-segmentation-using-i-cat-cone-beam-computed-tomography
#13
Babak Rastegar, Brice Thumilaire, Guillaume A Odri, Sergio Siciliano, Jan Zapała, Pierre Mahy, Raphael Olszewski
BACKGROUND: Validation of three-dimensional (3D) reconstructions of full dental arches with crowns and roots based on cone beam computed tomography (CBCT) imaging represents a key issue in 3D digital dentistry. OBJECTIVES: The aim of the study was to search for the most accurate in vivo windowing-based manual tooth segmentation using CBCT. The null hypothesis was that all applied windowing protocols were equivalent in terms of in vivo tooth volume measurement using CBCT...
July 12, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29984377/diagnosis-of-vertical-root-fracture-in-teeth-close-and-distant-to-implant-an-in-vitro-study-to-assess-the-influence-of-artifacts-produced-in-cone-beam-computed-tomography
#14
Deborah Queiroz Freitas, Taruska Ventorini Vasconcelos, Marcel Noujeim
OBJECTIVES: To evaluate the influence of artifacts produced by zirconium implant on the diagnosis of vertical root fracture (VRF) in teeth close and distant to the implant in cone beam computed tomography (CBCT) images. We also determined if kilovoltage (kVp) and metal artifact reduction (MAR) tool could influence this diagnosis. MATERIALS AND METHODS: Twenty single-root teeth were divided in control and fractured groups (n = 10). The teeth were randomly positioned in the first and second and right and left pre-molar alveoli of a dry human mandible...
July 8, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29983032/positional-uncertainties-of-cervical-and-upper-thoracic-spine-in-stereotactic-body-radiotherapy-with-thermoplastic-mask-immobilization
#15
Seung Hyuck Jeon, Jin Ho Kim
PURPOSE: To investigate positional uncertainty and its correlation with clinical parameters in spine stereotactic body radiotherapy (SBRT) using thermoplastic mask (TM) immobilization. Materials and. METHODS: A total of 21 patients who underwent spine SBRT for cervical or upper thoracic spinal lesions were retrospectively analyzed. All patients were treated with image guidance using cone beam computed tomography (CBCT) and 4 degrees-of-freedom (DoF) positional correction...
June 2018: Radiation Oncology Journal
https://www.readbyqxmd.com/read/29978548/dosimetric-effects-of-anatomical-deformations-and-positioning-errors-in-vmat-breast-radiotherapy
#16
Maija Rossi, Eeva Boman, Tanja Skyttä, Mikko Haltamo, Marko Laaksomaa, Mika Kapanen
AIM: Traditional radiotherapy treatment techniques of the breast are insensitive for deformations and swelling of the soft tissue. The purpose of this study was to evaluate the dose changes seen with tissue deformations using different image matching methods when VMAT technique was used, and compare these with tangential technique. METHODS: The study included 24 patients with breast or chest wall irradiations, nine of whom were bilateral. In addition to planar kV setup imaging, patients underwent weekly cone-beam computed tomography (CBCT) imaging to evaluate soft tissue deformations...
July 5, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29975152/feasibility-of-a-novel-liquid-fiducial-marker-for-use-in-image-guided-radiotherapy-of-oesophageal-cancer
#17
Steen Riisgaard de Blanck, Jonas Scherman-Rydhög, Mette Siemsen, Merete Christensen, Lene Baeksgaard, Rasmus Irming Jølck, Lena Specht, Thomas Lars Andresen, Gitte Fredberg Persson
OBJECTIVE: To evaluate the feasibility of a new liquid fiducial marker for use in image-guided radiotherapy for oesophageal cancer. METHODS: Liquid fiducial markers were implanted in patients with metastatic or inoperable locally advanced oesophageal or gastro-oesophageal junction cancer receiving radiotherapy. Markers were implanted using a conventional gastroscope equipped with a 22 G Wang needle. Marker visibility was evaluated on fluoroscopy, CT, MRI and cone beam CT scans...
July 9, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29967935/augmented-reality-surgical-navigation-with-accurate-cbct-patient-registration-for-dental-implant-placement
#18
Longfei Ma, Weipeng Jiang, Boyu Zhang, Xiaofeng Qu, Guochen Ning, Xinran Zhang, Hongen Liao
It is challenging to achieve high implant accuracy in dental implant placement, because high risk tissues need to be avoided. In this study, we present an augmented reality (AR) surgical navigation with an accurate cone beam computed tomography (CBCT)-patient registration method to provide clinically desired dental implant accuracy. A registration device is used for registration between preoperative data and patient outside the patient's mouth. After registration, the registration device is worn on the patient's teeth for tracking the patient...
July 2, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29963482/linear-accuracy-of-cone-beam-computed-tomography-and-a-3-dimensional-facial-scanning-system-an-anthropomorphic-phantom-study
#19
Song Hee Oh, Ju Hee Kang, Yu-Kyeong Seo, Sae Rom Lee, Hwa-Young Choi, Yong-Suk Choi, Eui-Hwan Hwang
Purpose: This study was conducted to evaluate the accuracy of linear measurements of 3-dimensional (3D) images generated by cone-beam computed tomography (CBCT) and facial scanning systems, and to assess the effect of scanning parameters, such as CBCT exposure settings, on image quality. Materials and Methods: CBCT and facial scanning images of an anthropomorphic phantom showing 13 soft-tissue anatomical landmarks were used in the study. The distances between the anatomical landmarks on the phantom were measured to obtain a reference for evaluating the accuracy of the 3D facial soft-tissue images...
June 2018: Imaging Science in Dentistry
https://www.readbyqxmd.com/read/29943120/development-and-validation-of-a-formula-based-on-maxillary-sinus-measurements-as-a-tool-for-sex-estimation-a-cone-beam-computed-tomography-study
#20
Amanda Farias Gomes, Thiago de Oliveira Gamba, Mayra Cristina Yamasaki, Francisco Carlos Groppo, Francisco Haiter Neto, Rosana de Fátima Possobon
BACKGROUND: As sex estimation is an important step to delineate the biological profile, the development of tools employing anatomical structures which may maintain their integrity even after extreme events, such as the maxillary sinus, become useful for forensic identification. Thus, the aim in the present study was to develop and validate a formula for sex estimation through measurements in the maxillary sinuses in a Brazilian population, using cone beam computed tomography (CBCT) scans...
June 25, 2018: International Journal of Legal Medicine
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