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3D CBCT imaging

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https://www.readbyqxmd.com/read/30324464/imaging-study-of-pseudo-ct-images-of-superposed-ultrasound-deformation-fields-acquired-in-radiotherapy-based-on-step-by-step-local-registration
#1
Hongfei Sun, Tao Lin, Kai Xie, Liugang Gao, Jianfeng Sui, Xinye Ni
The purpose of this study is to create a new pseudo-computed tomography (CT) imaging approach under superposed ultrasound (US) deformation fields based on step-by-step local registration. Scanned CT and US 3D image datasets of three patients with postoperative cervical carcinoma were selected, including CT (CTsim) and US images (USsim) acquired during simulated positioning process and cone beam CT (CBCT) and US images for positioning verification (USpv) acquired after treatment for 10 times. Regions of interest such as urinary bladders were segmented out and accepted local registration to obtain different deformation fields...
October 15, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/30319317/reduction-of-angularly-varying-data-truncation-in-c-arm-cbct-imaging
#2
Dan Xia, Yu-Bing Chang, Joe Manak, Adnan H Siddiqui, Zheng Zhang, Buxin Chen, Emil Y Sidky, Xiaochuan Pan
C-arm cone-beam computed tomography (CBCT) has been used increasingly as an imaging tool for yielding 3D anatomical information about the subjects in surgical and interventional procedures. In the clinical applications, the limited field-of-view (FOV) of C-arm CBCT can lead to significant data truncation, resulting in image artifacts that can obscure low contrast tumor embedded within soft-tissue background, thus limiting the utility of C-arm CBCT. The truncation issue can become serious as most of the surgical and interventional procedures would involve devices and tubes that are placed outside the FOV of C-arm CBCT and thus can engender angularly-varying-data truncation...
December 2018: Sensing and Imaging
https://www.readbyqxmd.com/read/30318325/impact-of-voxel-size-and-scan-time-on-the-accuracy-of-three-dimensional-radiological-imaging-data-from-cone-beam-computed-tomography
#3
Eva Dach, Bastian Bergauer, Anna Seidel, Cornelius von Wilmowsky, Werner Adler, Michael Lell, Manfred Wichmann, Ragai-Edward Matta
PURPOSE: Three-dimensional (3D) radiological imaging plays an important role in surgical planning used in modern dentistry. The aim of this study was to optimize imaging parameters with a special focus on voxel size and scan time. MATERIAL AND METHODS: A virtual 3D master model of a macerated human skull was generated using an industrial optical noncontact white light scanner. The skull was X-rayed with cone-beam computed tomography that was applied using different settings for voxel size and acquisition time (voxel edge length of 0...
September 19, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/30306710/a-clinical-3d-4d-cbct-based-treatment-dose-monitoring-system
#4
An Qin, David Gersten, Jian Liang, Qiang Liu, Inga Grill, Thomas Guerrero, Craig Stevens, Di Yan
To monitor delivered dose and trigger plan adaptation when deviation becomes unacceptable, a clinical treatment dose (Tx-Dose) reconstruction system based on three-dimensional (3D)/four-dimensional (4D)-cone beam computed tomograpy (CBCT) images was developed and evaluated on various treatment sites, particularly for lung cancer patient treated by stereotactic body radiation therapy (SBRT). This system integrates with our treatment planning system (TPS), Linacs recording and verification system (R&V), and CBCT imaging system, consisting of three modules: Treatment Schedule Monitoring module (TSM), pseudo-CT Generating module (PCG), and Treatment Dose Reconstruction/evaluation module (TDR)...
October 10, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/30288182/performance-of-cone-beam-computed-tomography-systems-in-visualizing-the-cortical-plate-in-3d-image-reconstruction-an-in-vitro-study
#5
Abbas Shokri, Mohammad Reza Jamalpour, Amir Eskandarloo, Mostafa Godiny, Payam Amini, Atefeh Khavid
Introduction: Cortical bone is an important anatomical structure and its thickness needs to be determined prior to many dental procedures to ensure treatment success. Imaging modalities are necessarily used in dentistry for treatment planning and dental procedures. Three-dimensional image reconstruction not only provides visual information but also enables accurate measurement of anatomical structures; thus, it is necessarily required for maxillofacial examination and in case of skeletal problems in this region...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/30285469/diagnostic-ultrasound-assessment-of-temporomandibular-joints-a-systematic-review-and-meta-analysis
#6
Fabiana Tolentino Almeida, Paul Major, Jacob L Jaremko, Lawrence H Le, Carlos Flores-Mir, Camila Pachêco-Pereira
OBJECTIVES: The purpose of this systematic review was to determine the diagnostic capability of Ultrasound (US) to assess TMJ alterations as disc displacement (DD), joint effusion (JE) and condylar changes (CC) using 3D imaging modalities as reference standard. METHODS: Studies were gathered by searching several electronic databases and partial grey literature up to January eighth, 2018 without restrictions of language and time. The risk of bias was evaluated using the second version of Quality Assessment Tool for Diagnostic of Accuracy Studies-2 (QUADAS-2)...
October 4, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30284102/comparison-of-linear-and-volumetric-measurements-obtained-from-periodontal-defects-by-using-cone-beam-ct-and-micro-ct-an-in-vitro-study
#7
M Ayşe Tayman, Kıvanç Kamburoğlu, Özlem Küçük, Funda S Ö Ateş, Meral Günhan
OBJECTIVES: To assess linear and volumetric measurement accuracy of periodontal defects (class 2 furcation, fenestration, dehiscence, and three-wall intrabony defect) by using CBCT and micro-CT images obtained at different voxel sizes. MATERIAL AND METHODS: We created 66 periodontal defects in human dry mandibles. Images of teeth with defects were taken by Planmeca Promox 3D Max (CBCT) at voxel sizes of 0.2 and 0.075 mm and super-argus PET/CT (micro-CT) at voxel sizes of 0...
October 3, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/30280374/assessment-of-paranasal-sinus-parameters-according-to-ancient-skulls-gender-and-age-by-using-cone-beam-computed-tomography
#8
Kemal Demiralp, Sebnem Kursun Cakmak, Secil Aksoy, Seval Bayrak, Kaan Orhan, Pervin Demir
BACKGROUND: The aim of this study was to determine whether paranasal sinus dimensions and volume can be useful to identify gender and age estimation for ancient skulls using cone beam computed tomography (CBCT) images. MATERIALS AND METHODS: CBCT scans of 32 ancient skulls from app. 1000 years of age were included in this retrospective study. The gender and age estimation of the skulls were made by an independent anthropologist which was served as the gold standard...
October 3, 2018: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/30237039/optimization-of-exposure-parameters-in-dental-cone-beam-computed-tomography-using-a-3-step-approach
#9
Soontra Panmekiate, Peera Rungwittayathon, Wijuck Suptaweeponboon, Nattarus Tangtraitham, Ruben Pauwels
OBJECTIVE: The aim of this study was to find the optimal balance among tube voltage (kV), tube current (mA), and exposure time (s) in cone beam computed tomography (CBCT). STUDY DESIGN: Three human hemimandibles were scanned by using the 3D Accuitomo 170 scanner (J. Morita, Kyoto, Japan). First, 3 combinations of kilovolt (kV) and milliampere (mA) were used at a constant radiation dose. Seven observers evaluated the images; the kV of the highest-scoring scan was considered optimal...
August 20, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/30235776/research-on-pseudo-ct-imaging-technique-based-on-an-ultrasound-deformation-field-with-binary-mask-in-radiotherapy
#10
Hongfei Sun, Kai Xie, Liugang Gao, Jianfeng Sui, Tao Lin, Xinye Ni
This study aimed to investigate the reliability of pseudo-computed tomography (pseudo-CT) imaging based on ultrasound (US) deformation fields under different binary masks in radiotherapy.We used 3-dimensional (3D) CT and US images, including those acquired during CT simulation positioning, and cone-beam CT (CBCT) and US images acquired 1 week after treating 3 patients with cervical cancer. Image data of 3 different layers were selected from the US images, and 3D CT images of each patient were selected. For US image registration, the following were created and applied: binary masks of the region of interest overlapping (ROIO) between the US image based on simulation positioning and US image for positioning verification, region of interest (ROI), whole overlapping (wholeO), and whole imaging region (whole)...
September 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/30229941/hand-wrist-knee-and-foot-ankle-dosimetry-and-image-quality-measurements-of-a-novel-extremity-imaging-unit-providing-cbct-and-2d-imaging-options
#11
John B Ludlow
PURPOSE: Radiation dose is a general concern in diagnostic imaging and a special concern for children who are at greater risk from radiation effects. This study evaluates effective doses (E) produced during 2D and volume imaging with a novel cone beam computed tomography (CBCT) based extremity imaging device. The device's compact size and protocol options offer image choices that enhance the potential for reduced dose and improved diagnostics when evaluating sports injuries. METHODS: Hand-wrist, foot-ankle, and knee phantoms were developed for use with optically stimulated luminescent dosimeters (OSL)...
September 19, 2018: Medical Physics
https://www.readbyqxmd.com/read/30220575/three-dimensional-reconstruction-of-the-temporal-bone-comparison-of-in-situ-ct-and-cbct-measurements
#12
E Guyader, J Savéan, C Clodic, P Letellier, P Meriot, R Marianowski
OBJECTIVE: To evaluate the accuracy of three-dimensional (3D) Cone Beam Computed Tomography (CBCT) and Computed Tomography (CT) reconstructions of human temporal bones compared with in situ measurements. MATERIAL AND METHODS: Experimental anatomical study of 10 human temporal bones. Wilcoxon's test was used to compare 8 distances on each temporal bone measured in situ and then on 3D CT and CBCT reconstructions. Six landmarks were used: external auditory canal (EAC), tip of the mastoid process, tip of the occiput, zygoma, a point situated 1cm above the tip of the mastoid process (T0) (open technique: lower limit of the mastoidectomy), head of stapes...
September 13, 2018: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/30212543/enabling-tomography-with-low-cost-c-arm-systems
#13
Monica Abella, Claudia de Molina, Nerea Ballesteros, Alba García-Santos, Álvaro Martínez, Inés García, Manuel Desco
In scenarios where the use of a Computed Tomography (CT) is difficult, such as during surgery or in the ICU, the use of a C-arm system to generate tomographic information could contribute with interesting additional clinical information. Recent days are seeing the development of the so-called cone-beam CT (CBCT) based on advanced motorized isocentric C-arm systems. To be able to make use of more basic C-arm systems, apart from the geometric non-idealities common to any CBCT, we need to address other difficulties...
2018: PloS One
https://www.readbyqxmd.com/read/30183677/an-augmented-correlation-framework-for-the-estimation-of-tumour-translational-and-rotational-motion-during-external-beam-radiotherapy-treatments-using-intermittent-monoscopic-x-ray-imaging-and-an-external-respiratory-signal
#14
Doan Trang Nguyen, Jeremy Todd Booth, Vincent Caillet, Nicholas Hardcastle, Adam Briggs, Carol Haddad, Thomas Eade, Ricky T O'Brien, Paul J Keall
Increasing evidence shows that intrafraction tumour motion monitoring must include both six degrees of freedom (6DoF): 3D translations and 3D rotations. Existing real- time algorithms for 6DoF target motion estimation requires continuous intrafraction fluoroscopic imaging at high frequency, thereby exposing patients to additional high imaging dose. This paper presents the first method capable of 6DoF motion monitoring using intermittent 2D kV imaging and a continuous external respiratory signal.
 Method: Our approach is to optimise a state-augmented linear correlation model between an external signal and internal 6DoF motion...
September 5, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/30180892/morphology-of-palatally-displaced-canines-and-adjacent-teeth-a-3-d-evaluation-from-cone-beam-computed-tomographic-images
#15
Rosalia Leonardi, Simone Muraglie, Salvatore Crimi, Marco Pirroni, Giuseppe Musumeci, Rosario Perrotta
BACKGROUND: The goal of this study was to investigate in patients with unilateral palatally displaced canine (PDC) the morphology of maxillary teeth from cone-beam computed tomography (CBCT) scans both on the PDC side and non-PDC side using a "surface matching" technique. METHODS: CBCT images from 28 patients (mean age 16.04 ± 1.77 years) with unilateral PDC were selected. Each tooth in this study was segmented and then rendered into a 3D model using Mimics Research software and the root length was measured...
September 4, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/30180274/image-quality-and-dose-characteristics-for-an-o-arm-intraoperative-imaging-system-with-model-based-image-reconstruction
#16
A Uneri, X Zhang, T Yi, J W Stayman, P A Helm, N Theodore, J H Siewerdsen
PURPOSE: To assess the imaging performance and radiation dose characteristics of the O-arm CBCT imaging system (Medtronic Inc., Littleton MA) and demonstrate the potential for improved image quality and reduced dose via model-based image reconstruction (MBIR). METHODS: Two main studies were performed to investigate previously unreported characteristics of the O-arm system. First is an investigation of dose and 3D image quality achieved with filtered back-projection (FBP) - including enhancements in geometric calibration, handling of lateral truncation and detector saturation, and incorporation of an isotropic apodization filter...
September 4, 2018: Medical Physics
https://www.readbyqxmd.com/read/30175923/computer-based-automatic-classification-of-trabecular-bone-pattern-can-assist-radiographic-bone-quality-assessment-at-dental-implant-site
#17
Laura Ferreira Pinheiro Nicolielo, Jeroen Van Dessel, G Harry van Lenthe, Ivo Lambrichts, Reinhilde Jacobs
OBJECTIVE: To develop and validate an automated classification method that determines the trabecular bone pattern at implant site based on three-dimensional bone morphometric parameters derived from CBCT images. METHODS: 25 human cadaver mandibles were scanned using CBCT clinical scanning protocol. Volumes-of-interest comprising only the trabecular bone of the posterior regions were selected and segmented for three-dimensional morphometric parameters calculation...
September 3, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/30172457/feasibility-of-markerless-3d-position-monitoring-of-the-central-airways-using-kilovoltage-projection-images-managing-the-risks-of-central-lung-stereotactic-radiotherapy
#18
Colien Hazelaar, Lineke van der Weide, Hassan Mostafavi, Ben J Slotman, Wilko F A R Verbakel, Max Dahele
BACKGROUND AND PURPOSE: Central lung stereotactic body radiotherapy (SBRT) can cause proximal bronchial tree (PBT) toxicity. Information on PBT position relative to the high-dose could aid risk management. We investigated template matching + triangulation for high-frequency markerless 3D PBT position monitoring. MATERIALS AND METHODS: Kilovoltage projections of a moving phantom (full-fan cone-beam CT [CBCT, 15 frames/second] without MV irradiation: 889 images/dataset + CBCT and 7 frames/second fluoroscopy with MV irradiation) and ten patients undergoing free-breathing stereotactic/hypofractionated lung irradiation (full-fan CBCT without MV irradiation, 470-500 images/dataset) were retrospectively analyzed...
August 29, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/30166830/diagnostic-accuracy-of-three-cone-beam-computed-tomography-systems-and-periapical-radiography-for-detection-of-fenestration-around-dental-implants
#19
Amir Eskandarloo, Samira Saati, Mahbubeh Purabdolahi Ardakani, Mohamadreza Jamalpour, Naser Mohammad Gholi Mezerji, Vahid Akheshteh
Context: Early detection of peri-implant bone defects is highly important to prevent further bone loss and implant failure. Aims: This study aimed to assess the diagnostic accuracy of three cone-beam computed tomography (CBCT) systems and periapical radiography for detection of fenestration around dental implants. Methods: Thirty-one titanium implants were placed in the bovine ribs, in which peri-implant fenestration were simulated. Using a round fissure bur, fenestration defects were created in the apical-third region of implants...
July 2018: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/30166225/three-dimensional-temporomandibular-joint-muscle-attachment-morphometry-and-its-impacts-on-musculoskeletal-modeling
#20
Xin She, Feng Wei, Brooke J Damon, Matthew C Coombs, Daniel G Lee, Michael K Lecholop, Thierry H Bacro, Martin B Steed, Naiquan Zheng, Xiaojing Chen, Hai Yao
In musculoskeletal models of the human temporomandibular joint (TMJ), muscles are typically represented by force vectors that connect approximate muscle origin and insertion centroids (centroid-to-centroid force vectors). This simplification assumes equivalent moment arms and muscle lengths for all fibers within a muscle even with complex geometry and may result in inaccurate estimations of muscle force and joint loading. The objectives of this study were to quantify the three-dimensional (3D) human TMJ muscle attachment morphometry and examine its impact on TMJ mechanics...
October 5, 2018: Journal of Biomechanics
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