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three dimensional reconstruction

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https://www.readbyqxmd.com/read/28340394/assessment-of-engineered-surfaces-roughness-by-high-resolution-3d-sem-photogrammetry
#1
L C Gontard, J D López-Castro, L González-Rovira, J M Vázquez-Martínez, F M Varela-Feria, M Marcos, J J Calvino
We describe a methodology to obtain three-dimensional models of engineered surfaces using scanning electron microscopy and multi-view photogrammetry (3DSEM). For the reconstruction of the 3D models of the surfaces we used freeware available in the cloud. The method was applied to study the surface roughness of metallic samples patterned with parallel grooves by means of laser. The results are compared with measurements obtained using stylus profilometry (PR) and SEM stereo-photogrammetry (SP). The application of 3DSEM is more time demanding than PR or SP, but it provides a more accurate representation of the surfaces...
March 7, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28339918/can-clinically-relevant-dose-errors-in-patient-anatomy-be-detected-by-gamma-passing-rate-or-modulation-complexity-score-in-volumetric-modulated-arc-therapy-for-intracranial-tumors
#2
Shingo Ohira, Yoshihiro Ueda, Masaru Isono, Akira Masaoka, Misaki Hashimoto, Masayoshi Miyazaki, Masaaki Takashina, Masahiko Koizumi, Teruki Teshima
We investigated whether methods conventionally used to evaluate patient-specific QA in volumetric-modulated arc therapy (VMAT) for intracranial tumors detect clinically relevant dosimetric errors. VMAT plans with coplanar arcs were designed for 37 intracranial tumors. Dosimetric accuracy was validated by using a 3D array detector. Dose deviations between the measured and planned doses were evaluated by gamma analysis. In addition, modulation complexity score for VMAT (MCSv) for each plan was calculated. Three-dimensional dose distributions in patient anatomy were reconstructed using 3DVH software, and clinical deviations in dosimetric parameters between the 3DVH doses and planned doses were calculated...
March 3, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339423/spherically-symmetric-volume-elements-as-basis-functions-for-image-reconstructions-in-computed-laminography
#3
Patrick Trampert, Jonas Vogelgesang, Christian Schorr, Michael Maisl, Sviatoslav Bogachev, Nico Marniok, Alfred Louis, Tim Dahmen, Philipp Slusallek
BACKGROUND: Laminography is a tomographic technique that allows three-dimensional imaging of flat and elongated objects that stretch beyond the extent of a reconstruction volume. Laminography images can be reconstructed using iterative algorithms based on the Kaczmarz method. OBJECTIVE: This study aims to develop and demonstrate a new reconstruction algorithm that may provide superior image reconstruction quality for this challenged imaging application. METHODS: The images are initially represented using the coefficients over basis functions, which are typically piecewise constant functions (voxels)...
March 21, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28332957/three-dimensional-computed-tomography-reconstruction-in-transplant-renal-artery-stenosis
#4
Xufeng Zhang, Hongwei Wang, Shuangde Liu, Jieke Yan, Xiaoli Liu, Dongsheng Xu, Chuan Tian
OBJECTIVES: Transplant renal artery stenosis is a frequently recognized complication of kidney transplant procedures. A single-center retrospective study was conducted to examine the use of 3-dimensional computed tomography reconstruction in diagnosing transplant artery stenosis. MATERIALS AND METHODS: During 2013 at our center, 86 patients underwent kidney transplant. All patients underwent ultrasonographic analyses. Patients with clinically suspected transplant renal artery stenosis were examined by 3-dimensional computed tomography reconstruction and were treated with endovascular approaches or medically managed...
March 22, 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28331829/the-pulmonary-nodule-discovered-by-pneumonia-a-case-report
#5
Dong-Mei Yuan, Jian-Ya Zhang, Yan-Wen Yao, Hui-Ming Sun, Guan-Nan Wu, E-Hong Cao, Luca Bertolaccini, Tang-Feng Lv, Yong Song
The number of patients diagnosed with pulmonary nodules increased as more patients with high risk of lung cancer choose low-dose computed tomography (CT) scans for the screening of cancer. Clinicians might get two questions from the patients: what is the definite diagnosis of the nodule? What should we do? We have already got many guidelines trying to solve these problems. There are also several prediction models for pulmonary nodules. However, guidelines are not suitable for all types of patients, and the reality of patients is more complicated...
February 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28331158/low-serum-levels-of-epa-are-associated-with-the-size-and-growth-rate-of-abdominal-aortic-aneurysm
#6
Tatsuro Aikawa, Tetsuro Miyazaki, Kazunori Shimada, Yurina Sugita, Megumi Shimizu, Shohei Ouchi, Tomoyasu Kadoguchi, Yasutaka Yokoyama, Tomoyuki Shiozawa, Masaru Hiki, Shuhei Takahashi, Hamad Al Shahi, Shizuyuki Dohi, Atsushi Amano, Hiroyuki Daida
AIM: Omega-3 polyunsaturated fatty acids (PUFAs) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been reported to reduce the risk of cardiovascular disease. However, whether omega-3 PUFAs are involved in the pathogenesis of abdominal aortic aneurysms (AAA) remains unclear. METHODS: We analyzed 67 consecutive patients admitted for the elective surgical repair of AAA. We investigated the association of serum EPA and DHA levels as well as the EPA/AA ratio with the size of AAA assessed using three-dimensional reconstructed computed tomography images...
March 22, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28329105/medical-three-dimensional-printing-opens-up-new-opportunities-in-cardiology-and-cardiac-surgery
#7
Thomas Bartel, Andrew Rivard, Alejandro Jimenez, Carlos A Mestres, Silvana Müller
Advanced percutaneous and surgical procedures in structural and congenital heart disease require precise pre-procedural planning and continuous quality control. Although current imaging modalities and post-processing software assists with peri-procedural guidance, their capabilities for spatial conceptualization remain limited in two- and three-dimensional representations. In contrast, 3D printing offers not only improved visualization for procedural planning, but provides substantial information on the accuracy of surgical reconstruction and device implantations...
February 16, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28329016/accuracy-and-reliability-of-cetacean-cranial-measurements-using-computed-tomography-three-dimensional-volume-rendered-images
#8
Adams Hei Long Yuen, Henry Chun Lok Tsui, Brian Chin Wing Kot
Computed tomography (CT) has become more readily available for post-mortem examination, offering an alternative to cetacean cranial measurements obtained manually. Measurement error may result in possible variation in cranial morphometric analysis. This study aimed to evaluate the accuracy and reliability of cetacean cranial measurements obtained by CT three-dimensional volume rendered images (3DVRI). CT scans of 9 stranded cetaceans were performed. The acquired images were reconstructed using bone reconstruction algorithms...
2017: PloS One
https://www.readbyqxmd.com/read/28328041/sem-microphotogrammetry-a-new-take-on-an-old-method-for-generating-high-resolution-3d-models-from-sem-images
#9
A D Ball, P A Job, A E L Walker
The method we present here uses a scanning electron microscope programmed via macros to automatically capture dozens of images at suitable angles to generate accurate, detailed three-dimensional (3D) surface models with micron-scale resolution. We demonstrate that it is possible to use these Scanning Electron Microscope (SEM) images in conjunction with commercially available software originally developed for photogrammetry reconstructions from Digital Single Lens Reflex (DSLR) cameras and to reconstruct 3D models of the specimen...
March 22, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28326709/-cone-beam-computed-tomography-analysis-of-the-bony-structure-of-the-temporomandibular-joint-during-two-phase-treatment-with-herbst-appliance
#10
Chen Weiwei, Sang Ting, Huang Zhen, Wu Jun
OBJECTIVE: This study assessed the effects of two-phase treatment with Herbst appliance on the bony structure of the temporomandibular joint via cone beam computed tomography (CBCT) analysis. METHODS: This study selected 15 patients exhibiting early permanent dentition and classⅡmalocclusion combined with mandibular retrusion treated by a two phase treatment (Herbst and fixed appliance). The CBCT scans of the patients were obtained at the following stages: 2 weeks before Herbst treatment (T1), at the start of treatment when the Herbst appliance was set in place (T2), immediately after removal of the Herbst appliance (T3), and immediately after removal of the edgewise appliance (T4)...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28323814/three-dimensional-evaluation-of-maxillary-sinus-septa-for-implant-placement
#11
Eliza Dragan, Guillaume A Odri, Gabriel Melian, Danisia Haba, Raphael Olszewski
BACKGROUND: The aim of our study was to investigate, in 3 dimensions, the maxillary sinus septa as an alternative site for dental implant placement to avoid sinus lift procedures. MATERIAL AND METHODS: We selected 100 dentate and 100 edentate patients with the presence of a maxillary sinus septum by reviewing a larger cone beam computer tomography (CBCT) database from the Department of Oral and Maxillofacial Surgery at Cliniques Universitaires Saint Luc in Bruxelles, Belgium...
March 21, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28322040/design-and-fabrication-of-a-thin-walled-freeform-scaffold-on-the-basis-of-medical-image-data-and-a-3d-printed-template-potential-use-in-bile-duct-regeneration
#12
Suk Hee Park, Bo-Kyeong Kang, Ji Eun Lee, Seung Woo Chun, Kiseok Jang, Youn Hwan Kim, Mi Ae Jeong, Yohan Kim, Kyo Jin Kang, Nak Kyu Lee, Dongho Choi, Han Joon Kim
Three-dimensional (3D) printing, combined with medical imaging technologies, such as computed tomography (CT) and magnetic resonance imaging (MRI), has shown great potential in patient-specific tissue regeneration. Here, we successfully fabricated an ultrathin tubular freeform structure that has a wall thickness of several tens of micrometers and is capable of providing sufficient mechanical flexibility. Such a thin geometry cannot easily be achieved by 3D printing alone; therefore, it was realized through a serial combination of processes that included the 3D printing of a sacrificial template, the dip-coating of the biomaterial, and the removal of the inner template...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28321385/the-laparoscopically-harvested-omental-free-flap-a-compelling-option-for-craniofacial-and-cranial-base-reconstruction
#13
Peter D Costantino, David Shamouelian, Tristan Tham, Robert Andrews, Wojciech Dec
Background Management of craniofacial and cranial base tumors is a challenge due to the anatomic intricacies associated with the calvarium, the pathological diversity of lesions that present, and the potential complications. Clinical outcomes in laparoscopically harvested omentum free flaps for cranial base and craniofacial reconstruction are presented in this paper, in the largest case series to date. Methods A retrospective single-center experience for over 10 years with laparoscopically harvested omentum flaps used to reconstruct craniofacial and cranial base defects...
April 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28320612/three-dimensional-image-fusion-of-18-f-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-and-contrast-enhanced-computed-tomography-for-computer-assisted-planning-of-maxillectomy-of-recurrent-maxillary-squamous-cell-carcinoma-and-defect-reconstruction
#14
Yao Yu, Wen-Bo Zhang, Xiao-Jing Liu, Chuan-Bin Guo, Guang-Yan Yu, Xin Peng
PURPOSE: The purpose of this study was to describe new technology assisted by 3-dimensional (3D) image fusion of (18)F-fluorodeoxyglucose (FDG)-positron emission tomography (PET)/computed tomography (CT) and contrast-enhanced CT (CECT) for computer planning of a maxillectomy of recurrent maxillary squamous cell carcinoma and defect reconstruction. MATERIALS AND METHODS: Treatment of recurrent maxillary squamous cell carcinoma usually includes tumor resection and free flap reconstruction...
February 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28320230/placental-characteristics-in-monochorionic-twins-with-selective-intrauterine-growth-restriction-assessed-by-gradient-angiography-and-three-dimensional-reconstruction
#15
Chenyu Gou, Meizhi Li, Xiaoling Zhang, Xiangzhen Liu, Xuan Huang, Yi Zhou, Qun Fang
OBJECTIVE: To investigate the placental characteristics in selective intrauterine growth restriction (sIUGR) using gradient angiography and three-dimensional (3D) reconstruction from computed tomography (CT) scan data. METHODS: This study included 23 sIUGR cases and 16 monochorionic twin-pregnancies without sIUGR. We injected nonionic iodinated contrast agents into the umbilical arteries and veins. Placental characteristics were analyzed after CT scanning and 3D reconstruction...
March 21, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28318927/classical-versus-custom-orbital-wall-reconstruction-selected-factors-regarding-surgery-and-hospitalization
#16
Rafał Zieliński, Marta Malińska, Marcin Kozakiewicz
PURPOSE: Nowadays, in orbital wall reconstruction, maxillofacial surgeons have the possibility to treat patients in modern ways such as with individual implants. Nevertheless, conventional treatment including standard titanium mesh shaped during the surgical procedure is also widely used. The aim of this study was to compare the above methods of orbital wall reconstructions. MATERIALS AND METHODS: In the first group (39 cases), patients were treated by means of computer-aided design/computer-aided manufacturing (CAD/CAM) milled individual implants made of ultra-high-molecular-weight polyethylene, dioxide zirconium and rapid prototyping titanium mesh pre-bent on an ABS model made by a three-dimensional (3D) printer...
February 17, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28318741/neonatal-magnetic-resonance-imaging-without-sedation-correlates-with-injury-severity-in-brachial-plexus-birth-palsy
#17
Andrea S Bauer, Peter Y Shen, Anna E Nidecker, Paul S Lee, Michelle A James
PURPOSE: Which infants with brachial plexus birth palsy (BPBP) should undergo microsurgical plexus reconstruction remains controversial. The current gold standard for the decision for plexus reconstruction is serial clinical examinations, but this approach obviates the possibility of early surgical treatment. We hypothesize that a new technique using 3-dimensional volumetric proton density magnetic resonance imaging (MRI) without sedation can evaluate the severity of BPBP injury earlier than serial clinical examinations...
March 16, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28318483/automated-atom-by-atom-three-dimensional-3d-reconstruction-of-field-ion-microscopy-data
#18
Michal Dagan, Baptiste Gault, George D W Smith, Paul A J Bagot, Michael P Moody
An automated procedure has been developed for the reconstruction of field ion microscopy (FIM) data that maintains its atomistic nature. FIM characterizes individual atoms on the specimen's surface, evolving subject to field evaporation, in a series of two-dimensional (2D) images. Its unique spatial resolution enables direct imaging of crystal defects as small as single vacancies. To fully exploit FIM's potential, automated analysis tools are required. The reconstruction algorithm developed here relies on minimal assumptions and is sensitive to atomic coordinates of all imaged atoms...
March 20, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28317355/-three-dimensional-analysis-of-alveolar-changes-of-complete-unilateral-cleft-lip-patients-after-presurgical-nasoalveolar-molding-treatment
#19
Li Hongyi, Kuang Hai, Wang Xiaomeng, Li Dongshuang
OBJECTIVE: This study analyzed the alveolar changes of complete unilateral cleft lip (UCCL) patients after pre-surgical nasoalveolar molding (PNAM) treatment using a three-dimensional method. METHODS: Palate impressions of thirty UCCL patients who underwent PNAM treatment in the Affiliated Stomatology Hospital of Guangxi Medical University were taken pre- and post-PNAM. The plaster impressions were scanned using cone beam computed tomography (CBCT). The DICOM files were exported and 3D models reconstructed in Mimics 15...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28316884/three-dimensional-visualisation-of-the-internal-anatomy-of-the-sparrowhawk-accipiter-nisus-forelimb-using-contrast-enhanced-micro-computed-tomography
#20
Fernanda Bribiesca-Contreras, William I Sellers
BACKGROUND: Gross dissection is a widespread method for studying animal anatomy, despite being highly destructive and time-consuming. X-ray computed tomography (CT) has been shown to be a non-destructive alternative for studying anatomical structures. However, in the past it has been limited to only being able to visualise mineralised tissues. In recent years, morphologists have started to use traditional X-ray contrast agents to allow the visualisation of soft tissue elements in the CT context...
2017: PeerJ
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