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https://www.readbyqxmd.com/read/28934648/evaluation-of-tooth-root-surface-area-using-a-three-dimensional-scanning-technique-and-cone-beam-computed-tomographic-reconstruction-in-vitro
#1
Tong Wang, Xibo Pei, Feng Luo, Lingling Jia, Han Qin, Xinting Cheng, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVE: To study the feasibility of measuring root surface area (RSA) by 3D scanning technique and cone beam computed tomography (CBCT) reconstruction in vitro. DESIGN: Twenty extracted teeth (10 single-rooted teeth and 10 multi-rooted teeth) were collected in this study. The RSA of the extracted teeth was measured by the membrane technique, 3D scanning technique, and CBCT reconstruction. A standard part was also designed to check the accuracy of each method...
July 21, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28934124/n-halamine-biocidal-materials-with-superior-antimicrobial-efficacies-for-wound-dressings
#2
Buket Demir, Roy M Broughton, Mingyu Qiao, Tung-Shi Huang, S D Worley
This work demonstrated the successful application of N-halamine technology for wound dressings rendered antimicrobial by facile and inexpensive processes. Four N-halamine compounds, which possess different functional groups and chemistry, were synthesized. The N-halamine compounds, which contained oxidative chlorine, the source of antimicrobial activity, were impregnated into or coated onto standard non-antimicrobial wound dressings. N-halamine-employed wound dressings inactivated about 6 to 7 logs of Staphylococcus aureus and Pseudomonas aeruginosa bacteria in brief periods of contact time...
September 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28933333/-canine-elbow-humeroulnar-incongruity-measurements-using-computed-tomography
#3
R Snášil, P Proks, A Nečasová, K Michalčáková, A Nečas
PURPOSE OF THE STUDY The purpose of the study is to compare the repeatability and reproducibility of quantitative and subjective evaluation of elbow humeroulnar incongruity (HUI) using computed tomography (CT) on an in vivo canine model. MATERIAL AND METHODS HUI was evaluated on canine (n = 50) elbow joints (n = 100). The computed tomography of elbow joints was performed under intravenous sedation. Multiplanar reconstructions (MPR) were produced. HUI was evaluated on sagittal MPR images subjectively and by measuring the subluxation index (SI)...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28932971/the-correlation-of-supraspinatus-outlet-view-with-computed-tomography-for-visualization-of-the-anterior-acromial-undersurface
#4
Viktor Feldman, Niv Marom, Meir Nyska, Eugene Kotz, Jonathan E J Koh, Vidal Barchilon
INTRODUCTION: Understanding the real shape of the undersurface of the acromion prior to acromioplasty is indispensable. Today, Supraspinatus outlet view (SSOV) is a standard view used to determine the shape of the anterior acromion. Three types of acromial undersurface were described by Bigliani and Morrison. The purpose of this study was to find out whether the real acromial type can be visualized on X-ray SSOV and compare the shape of the anterior undersurface of the acromion visualized on SSOV, with the shape revealed on 2D CT reconstructions...
September 20, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28932703/imaging-in-traumatic-mandibular-fractures
#5
REVIEW
Adil Naeem, Hugo Gemal, Duncan Reed
A fracture of the mandible is a common trauma presentation amongst young males and represents one of the most frequently encountered fractured bones within the viscerocranium. Historically, assault was the dominant contributing factor but now due to the increased number of vehicles used per capita, motor vehicle accidents are the primary cause. Mandibular fractures can be classified anatomically, by dentition, by muscle group and by severity. The fracture may also be closed, open, comminuted, displaced or pathological...
August 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28931926/unveiling-the-signals-from-extremely-noisy-microseismic-data-for-high-resolution-hydraulic-fracturing-monitoring
#6
Weilin Huang, Runqiu Wang, Huijian Li, Yangkang Chen
Microseismic method is an essential technique for monitoring the dynamic status of hydraulic fracturing during the development of unconventional reservoirs. However, one of the challenges in microseismic monitoring is that those seismic signals generated from micro seismicity have extremely low amplitude. We develop a methodology to unveil the signals that are smeared in the strong ambient noise and thus facilitate a more accurate arrival-time picking that will ultimately improve the localization accuracy. In the proposed technique, we decompose the recorded data into several morphological multi-scale components...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931889/fast-fourier-single-pixel-imaging-via-binary-illumination
#7
Zibang Zhang, Xueying Wang, Guoan Zheng, Jingang Zhong
Fourier single-pixel imaging (FSI) employs Fourier basis patterns for encoding spatial information and is capable of reconstructing high-quality two-dimensional and three-dimensional images. Fourier-domain sparsity in natural scenes allows FSI to recover sharp images from undersampled data. The original FSI demonstration, however, requires grayscale Fourier basis patterns for illumination. This requirement imposes a limitation on the imaging speed as digital micro-mirror devices (DMDs) generate grayscale patterns at a low refreshing rate...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931469/restorative-effects-of-curcumin-on-sleep-deprivation-induced-memory-impairments-and-structural-changes-of-the-hippocampus-in-a-rat-model
#8
Ali Noorafshan, Fatemeh Karimi, Ali-Mohammad Kamali, Saied Karbalay-Doust, Mohammad Nami
The present study examined the consequences of rapid eye-movement sleep-deprivation (REM-SD) with or without curcumin treatment. The outcome measures comprised quantitative features in the three-dimensional reconstructed (3DR) CA1 and dentate gyrus in experimental and control animals using stereological procedures. Male rats were arbitrarily assigned to nine groups based on the intervention and treatment administered including: 1-cage control+distilled water, 2-cage control+curcumin (100mg/kg/day), 3-cage control+olive oil, 4-REM-SD+distilled water, 5-REM-SD+curcumin, 6-REM-SD+olive oil, 7-grid-floor control+distilled water, 8-grid-floor control+curcumin, and 9-grid-floor control+olive oil...
September 17, 2017: Life Sciences
https://www.readbyqxmd.com/read/28931437/acute-reverse-annular-remodeling-during-mitraclip-%C3%A2-therapy-predicts-improved-clinical-outcome-in-heart-failure-patients-a-3d-echocardiography-study
#9
Theresa Herbrand, Silke Eschenhagen, Tobias Zeus, Eva Kehmeier, Katharina Hellhammer, Verena Veulemans, Malte Kelm, Jan Balzer
BACKGROUND: Transcatheter mitral valve repair (TMVR) has been shown to have acute effects on mitral valve geometry in patients with functional mitral regurgitation (FMR). This study investigates the impact of MitraClip(®) therapy-induced annular remodeling on clinical outcome and mitral regurgitation in heart failure patients. METHODS: TMVR was performed successfully in 45 patients with FMR. In this study, mitral valve datasets were obtained before and directly after MitraClip(®) implantation using three-dimensional (3D) transesophageal echocardiography, and were analyzed offline retrospectively using dedicated 3D reconstruction software...
September 20, 2017: European Journal of Medical Research
https://www.readbyqxmd.com/read/28931054/reconstruction-of-reaching-movement-trajectories-using-electrocorticographic-signals-in-humans
#10
Omid Talakoub, Cesar Marquez-Chin, Milos R Popovic, Jessie Navarro, Erich T Fonoff, Clement Hamani, Willy Wong
In this study, we used electrocorticographic (ECoG) signals to extract the onset of arm movement as well as the velocity of the hand as a function of time. ECoG recordings were obtained from three individuals while they performed reaching tasks in the left, right and forward directions. The ECoG electrodes were placed over the motor cortex contralateral to the moving arm. Movement onset was detected from gamma activity with near perfect accuracy (> 98%), and a multiple linear regression model was used to predict the trajectory of the reaching task in three-dimensional space with an accuracy exceeding 85%...
2017: PloS One
https://www.readbyqxmd.com/read/28930985/visualizing-angiogenesis-by-multiphoton-microscopy-in-vivo-in-genetically-modified-3d-plga-nhap-scaffold-for-calvarial-critical-bone-defect-repair
#11
Jian Li, Holger Jahr, Wei Zheng, Pei-Gen Ren
The reconstruction of critically sized bone defects remains a serious clinical problem because of poor angiogenesis within tissue-engineered scaffolds during repair, which gives rise to a lack of sufficient blood supply and causes necrosis of the new tissues. Rapid vascularization is a vital prerequisite for new tissue survival and integration with existing host tissue. The de novo generation of vasculature in scaffolds is one of the most important steps in making bone regeneration more efficient, allowing repairing tissue to grow into a scaffold...
September 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28929219/3d-printing-for-clinical-application-in-otorhinolaryngology
#12
REVIEW
Nongping Zhong, Xia Zhao
Three-dimensional (3D) printing is a promising technology that can use a patient's image data to create complex and personalized constructs precisely. It has made great progress over the past few decades and has been widely used in medicine including medical modeling, surgical planning, medical education and training, prosthesis and implants. Three-dimensional (3D) bioprinting is a powerful tool that has the potential to fabricate bioengineered constructs of the desired shape layer-by-layer using computer-aided deposition of living cells and biomaterials...
September 19, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28928818/the-value-of-computer-assisted-navigation-for-bone-reconstruction-after-tumor-resection
#13
Xuejun Peng, Fengping Wang, Jing Su
This study was designed to evaluate the use of computer-assisted navigation with computed tomography (CT) images for bone reconstruction after resection in malignant bone tumor treatment. Forty-five patients with malignant bone tumors were recruited for this study. CT scan images in a computer-assisted navigation system were used to assist during the osteotomy, the pairing with allografts, and the monitoring of the allograft and joint lines to perform joint reconstruction. Our results show that osteotomy and allograft pairing were successful in all patients...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28927642/iterative-approach-for-3d-reconstruction-of-the-femur-from-un-calibrated-2d-radiographic-images
#14
Kibeom Youn, Moon Soek Park, Jehee Lee
Three-dimensional reconstruction of the femur is important for surgical planning in patients with cerebral palsy. This study aimed to reconstruct the three-dimensional femur shape from un-calibrated bi-planar radiographic images using self-calibration to allow for low-dose preoperative planning. The existing self-calibration techniques require anatomical landmarks that are clearly visible on bi-planar images, which are not available on the femur. In our newly developed method, the self-calibration is performed so that the contour of the statistical shape matches the image contour while the statistical shape is concomitantly optimized...
September 15, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28925823/deep-learning-mr-imaging-based-attenuation-correction-for-pet-mr-imaging
#15
Fang Liu, Hyungseok Jang, Richard Kijowski, Tyler Bradshaw, Alan B McMillan
Purpose To develop and evaluate the feasibility of deep learning approaches for magnetic resonance (MR) imaging-based attenuation correction (AC) (termed deep MRAC) in brain positron emission tomography (PET)/MR imaging. Materials and Methods A PET/MR imaging AC pipeline was built by using a deep learning approach to generate pseudo computed tomographic (CT) scans from MR images. A deep convolutional auto-encoder network was trained to identify air, bone, and soft tissue in volumetric head MR images coregistered to CT data for training...
September 19, 2017: Radiology
https://www.readbyqxmd.com/read/28925490/multi-detector-spiral-ct-diagnosis-of-common-bile-duct-ampullary-carcinoma
#16
D-Z Zhao, Y Guo, Y-P Sun, H-M Liu, Z Zhang, Q-L Ma, Y-S Wang, C-L Chen
OBJECTIVE: The aim of this project was to study the imaging characteristics of multi-detector CT (MDCT) in different types of malignant tumor in the common bile duct ampulla. PATIENTS AND METHODS: We examined 30 cases of pancreatic head cancer, 35 of terminal cholangiocarcinoma, 26 of ampullary carcinoma, and 40 of benign lesions, all confirmed by pathology. We used 64-slice spiral CT plain scan and multi-phase enhanced scan with multi-planar reconstruction (MPR) and curved planar reconstruction (CPR) post-processing to obtain three-dimensional images...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28924666/brain-slice-staining-and-preparation-for-three-dimensional-super-resolution-microscopy
#17
Christopher L German, Manasa V Gudheti, Annette E Fleckenstein, Erik M Jorgensen
Localization microscopy techniques-such as photoactivation localization microscopy (PALM), fluorescent PALM (FPALM), ground state depletion (GSD), and stochastic optical reconstruction microscopy (STORM)-provide the highest precision for single-molecule localization currently available. However, localization microscopy has been largely limited to cell cultures due to the difficulties that arise in imaging thicker tissue sections. Sample fixation and antibody staining, background fluorescence, fluorophore photoinstability, light scattering in thick sections, and sample movement create significant challenges for imaging intact tissue...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28924572/stereovision-based-integrated-system-for-point-cloud-reconstruction-and-simulated-brain-shift-validation
#18
Xiaochen Yang, Logan W Clements, Ma Luo, Saramati Narasimhan, Reid C Thompson, Benoit M Dawant, Michael I Miga
Intraoperative soft tissue deformation, referred to as brain shift, compromises the application of current image-guided surgery navigation systems in neurosurgery. A computational model driven by sparse data has been proposed as a cost-effective method to compensate for cortical surface and volumetric displacements. We present a mock environment developed to acquire stereoimages from a tracked operating microscope and to reconstruct three-dimensional point clouds from these images. A reconstruction error of 1 mm is estimated by using a phantom with a known geometry and independently measured deformation extent...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28924570/implementation-and-ct-sampling-characterization-of-a-third-generation-spect-ct-system-for-dedicated-breast-imaging
#19
Jainil P Shah, Steve D Mann, Randolph L McKinley, Martin P Tornai
Stand-alone cone beam computed tomography (CT) and single-photon emission computed tomography (SPECT) systems capable of complex acquisition trajectories have previously been developed for breast imaging. Fully three-dimensional (3-D) motions of SPECT systems provide views into the chest wall and throughout the entire volume. The polar tilting capability of the CBCT system has shown improvement in sampling close to the chest wall, while eliminating cone beam artifacts. Here, a single hybrid SPECT-CT system, with each individual modality capable of independently traversing complex trajectories around a common pendant breast volume, was developed...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28924196/rapid-alignment-of-nanotomography-data-using-joint-iterative-reconstruction-and-reprojection
#20
Doğa Gürsoy, Young P Hong, Kuan He, Karl Hujsak, Seunghwan Yoo, Si Chen, Yue Li, Mingyuan Ge, Lisa M Miller, Yong S Chu, Vincent De Andrade, Kai He, Oliver Cossairt, Aggelos K Katsaggelos, Chris Jacobsen
As x-ray and electron tomography is pushed further into the nanoscale, the limitations of rotation stages become more apparent, leading to challenges in the alignment of the acquired projection images. Here we present an approach for rapid post-acquisition alignment of these projections to obtain high quality three-dimensional images. Our approach is based on a joint estimation of alignment errors, and the object, using an iterative refinement procedure. With simulated data where we know the alignment error of each projection image, our approach shows a residual alignment error that is a factor of a thousand smaller, and it reaches the same error level in the reconstructed image in less than half the number of iterations...
September 18, 2017: Scientific Reports
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