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https://www.readbyqxmd.com/read/29334575/measurement-of-warping-angle-in-human-rib-graft-experimental-study
#1
Safvet Ors
To determine the warping angle of the costal cartilage in vivo. A nasal framework reconstruction with a rib graft was performed in a total of 130 patients. After the cartilage specimens were prepared, the remaining grafts were used for the experimental study. The angle of warping in all grafts was measured at 0, 30, and 60 minutes, after 24 hours and after one week. In this study, 8 subgroups of graft thicknesses from central and peripheral groups, which were determined according to the perichondral distance of the grafts, were evaluated, and the warping angles of a total of 48 osteochondral and chondral grafts were individually measured...
January 10, 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29334402/noninvasive-reconstruction-of-placental-methylome-from-maternal-plasma-dna-potential-for-prenatal-testing-and-monitoring
#2
Kun Sun, Fiona M F Lun, Tak Y Leung, Rossa W K Chiu, Y M Dennis Lo, Hao Sun
OBJECTIVE: During human pregnancy, the DNA methylation of placental tissue is highly relevant to the normal growth and development of the fetus, therefore methylomic analysis of the placental tissue possesses high research and clinical value in prenatal testing and monitoring. Thus our aim is to develop an approach for reconstruction of the placental methylome, which should be completely noninvasive and achieve high accuracy and resolution. RESULTS: We propose a novel size-based algorithm, FEMER, to noninvasively reconstruct the placental methylome by genomewide bisulfite sequencing and size-based analysis of maternal plasma DNA...
January 15, 2018: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29334369/dual-gene-activation-and-knockout-screen-reveals-directional-dependencies-in-genetic-networks
#3
Michael Boettcher, Ruilin Tian, James A Blau, Evan Markegard, Ryan T Wagner, David Wu, Xiulei Mo, Anne Biton, Noah Zaitlen, Haian Fu, Frank McCormick, Martin Kampmann, Michael T McManus
Understanding the direction of information flow is essential for characterizing how genetic networks affect phenotypes. However, methods to find genetic interactions largely fail to reveal directional dependencies. We combine two orthogonal Cas9 proteins from Streptococcus pyogenes and Staphylococcus aureus to carry out a dual screen in which one gene is activated while a second gene is deleted in the same cell. We analyze the quantitative effects of activation and knockout to calculate genetic interaction and directionality scores for each gene pair...
January 15, 2018: Nature Biotechnology
https://www.readbyqxmd.com/read/29334363/macrophage-membrane-coated-iron-oxide-nanoparticles-for-enhanced-photothermal-tumor-therapy
#4
Qian-Fang Meng, Lang Rao, Minghui Zan, Ming Chen, Guang-Tao Yu, Xiaoyun Wei, Zhuhao Wu, Yue Sun, Shi Shang Guo, Xing-Zhong Zhao, Fu-Bing Wang, Wei Liu
Nanotechnology possesses the potential to revolutionize the diagnosis and treatment of tumors. The ideal nanoparticles used for in vivo cancer therapy should own long blood circulation and active cancer targeting. Additionally, they should be innoxious and invisible to the immune system. Here, we developed a biomimetic nanoplatform with the above properties for cancer therapy. Macrophage membranes were reconstructed into vesicles and then coated onto magnetic iron oxide nanoparticles (Fe3O4 NPs). Inherited from the Fe3O4 core and the macrophage membrane shell, the resulting Fe3O4@MM NPs exhibited good biocompatibility, immune evasion, cancer targeting, and light-to-heat conversion capabilities...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29334259/development-of-three-dimensional-brain-arteriovenous-malformation-model-for-patient-communication-and-young-neurosurgeon-education
#5
Mengqi Dong, Guangzhong Chen, Kun Qin, Xiaowen Ding, Dong Zhou, Chao Peng, Shaojian Zeng, Xianming Deng
PURPOSE: Rapid prototyping technology is used to fabricate three-dimensional (3D) brain arteriovenous malformation (AVM) models and facilitate presurgical patient communication and medical education for young surgeons. METHODS: Two intracranial AVM cases were selected for this study. Using 3D CT angiography or 3D rotational angiography images, the brain AVM models were reconstructed on personal computer and the rapid prototyping process was completed using a 3D printer...
January 15, 2018: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/29334131/a-bayesian-method-for-accelerated-magnetic-resonance-elastography-of-the-liver
#6
Christopher Ebersole, Rizwan Ahmad, Adam V Rich, Lee C Potter, Huiming Dong, Arunark Kolipaka
PURPOSE: Magnetic resonance elastography is a noninvasive tool for quantifying soft tissue stiffness. Magnetic resonance elastography has been adopted as a clinical method for staging liver fibrosis. However, the application of liver magnetic resonance elastography requires multiple lengthy breath-holds. We propose a new data acquisition and processing method to reduce magnetic resonance elastography scan time. METHODS: A Bayesian image reconstruction method that uses transform sparsity and magnitude consistency across different phase offsets to recover images from highly undersampled data is proposed...
January 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29333949/the-reading-man-flap-for-reconstruction-of-large-periorbital-defects
#7
Elizabeth A Insull, Varajini Joganathan, Jonathan H Norris
PURPOSE: The "reading man" flap (RMF), a double advancement transposition cutaneous flap named for its appearance, has been described in the reconstruction of various circular skin defects, particularly in the malar region. We describe two cases where this flap was used to reconstruct the lower eyelid/periorbital region. METHODS: Two oculoplastic patients with lower eyelid basal cell carcinomas underwent Mohs micrographic excision resulting in a large skin defects...
January 15, 2018: Orbit
https://www.readbyqxmd.com/read/29333919/reconstruction-of-extensive-medial-canthal-defects-using-a-single-v-y-island-pedicle-flap
#8
Christopher M Stewart, Jonathan H Norris
The medial canthus represents one of the most challenging regions of the face to reconstruct due to the anatomical structures present, the concavity of the area, and the differences in skin texture. We present a case series of 11 patients whose defects were reconstructed with a single V-Y island pedicle flap running along the nasofacial sulcus. Our single-stage flap which modified and simplified a previously described technique achieves similar cosmetic and postoperative outcomes along with a high level of patient satisfaction in an area which can be reconstructed in a variety of ways, often with suboptimal results...
January 15, 2018: Orbit
https://www.readbyqxmd.com/read/29333918/modified-second-stage-hughes-tarsoconjunctival-reconstruction-for-lower-eyelid-defects
#9
Shruti Aggarwal, Christopher T Shah, Maria Kirzhner
To describe a novel technique utilizing an amniotic membrane graft (AMT) to create the mucocutaneous portion of the lower eyelid margin in a modified Hughes eyelid reconstruction for secondary revision or prevention of a hyperemic, hypertrophic conjunctival margin with excessive discharge. This was a retrospective, non-comparative interventional study. Thirty consecutive patients who underwent a modified Hughes reconstruction were included. The first step of the reconstruction was performed in a standard fashion using a tarsoconjunctival flap from the ipsilateral upper eyelid...
January 15, 2018: Orbit
https://www.readbyqxmd.com/read/29333783/-application-of-preoperative-vascular-localization-techniques-for-perforator-flaps
#10
Wu Lianjun, Wang Huiming
With the development of microvascular technology, perforator flaps have gradually become a good alternative for reconstruction of tissue defects. However, the major limitations of perforator flaps include uncertainty in predicting anatomical location of perforators and high variability in perforator size and course, which require preoperative localization techniques. Recently, as one of the preoperative localization techniques, computed tomography angiography was used to determine the number, size, course, and exact emerging point of perforator flaps...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333780/-progress-in-exogenous-factors-affecting-the-growth-and-remodeling-of-condylar-process
#11
Peng Qiuping, Wu Jun
Condyle is a critical growth region of the mandible where mandible by endochondral ossification occurs. Condylar cartilage belongs to the secondary cartilage, which is not only affected by genetic factors but also by stress, drug intake, and other local factors. To promote the growth of the mandible, various exogenous and local factors were used to alter the biological environment of the condylar cartilage to stimulate endochondral ossification. This article reviews studies on the influence of exogenous factors on condylar growth and reconstruction...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333754/a-guide-to-analysis-and-reconstruction-of-serial-block-face-scanning-electron-microscopy-data
#12
E Cocks, M Taggart, F C Rind, K White
Serial block face scanning electron microscopy (SBF-SEM) is a relatively new technique that allows the acquisition of serially sectioned, imaged and digitally aligned ultrastructural data. There is a wealth of information that can be obtained from the resulting image stacks but this presents a new challenge for researchers - how to computationally analyse and make best use of the large datasets produced. One approach is to reconstruct structures and features of interest in 3D. However, the software programmes can appear overwhelming, time-consuming and not intuitive for those new to image analysis...
January 15, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29333592/3d-models-of-female-pelvis-structures-reconstructed-and-represented-in-combination-with-anatomical-and-radiological-sections
#13
L Asensio Romero, M Asensio Gómez, A Prats-Galino, J A Juanes Méndez
We present a computer program designed to visualize and interact with three-dimensional models of the main anatomical structures of the female pelvis. They are reconstructed from serial sections of corpse, from the Visible Human project of the Medical Library of the United States and from serial sections of high-resolution magnetic resonance. It is possible to represent these three-dimensional structures in any spatial orientation, together with sectional images of corpse and magnetic resonance imaging, in the three planes of space (axial, coronal and sagittal) that facilitates the anatomical understanding and the identification of the set of visceral structures of this body region...
January 15, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29333480/gpu-based-branchless-distance-driven-projection-and-backprojection
#14
Rui Liu, Lin Fu, Bruno De Man, Hengyong Yu
Projection and backprojection operations are essential in a variety of image reconstruction and physical correction algorithms in CT. The distance-driven (DD) projection and backprojection are widely used for their highly sequential memory access pattern and low arithmetic cost. However, a typical DD implementation has an inner loop that adjusts the calculation depending on the relative position between voxel and detector cell boundaries. The irregularity of the branch behavior makes it inefficient to be implemented on massively parallel computing devices such as graphics processing units (GPUs)...
December 2017: IEEE Transactions on Computational Imaging
https://www.readbyqxmd.com/read/29333473/charge-migration-and-charge-transfer-in-molecular-systems
#15
REVIEW
Hans Jakob Wörner, Christopher A Arrell, Natalie Banerji, Andrea Cannizzo, Majed Chergui, Akshaya K Das, Peter Hamm, Ursula Keller, Peter M Kraus, Elisa Liberatore, Pablo Lopez-Tarifa, Matteo Lucchini, Markus Meuwly, Chris Milne, Jacques-E Moser, Ursula Rothlisberger, Grigory Smolentsev, Joël Teuscher, Jeroen A van Bokhoven, Oliver Wenger
The transfer of charge at the molecular level plays a fundamental role in many areas of chemistry, physics, biology and materials science. Today, more than 60 years after the seminal work of R. A. Marcus, charge transfer is still a very active field of research. An important recent impetus comes from the ability to resolve ever faster temporal events, down to the attosecond time scale. Such a high temporal resolution now offers the possibility to unravel the most elementary quantum dynamics of both electrons and nuclei that participate in the complex process of charge transfer...
November 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/29333464/comparison-of-tof-pet-and-bremsstrahlung-spect-images-of-yttrium-90-a-monte-carlo-simulation-study
#16
Akihiko Takahashi, Kazuhiko Himuro, Shingo Baba, Yasuo Yamashita, Masayuki Sasaki
Objectives: Yttrium-90 (90Y) is a beta particle nuclide used in targeted radionuclide therapy which is available to both single-photon emission computed tomography (SPECT) and time-of-flight (TOF) positron emission tomography (PET) imaging. The purpose of this study was to assess the image quality of PET and Bremsstrahlung SPECT by simulating PET and SPECT images of 90Y using Monte Carlo simulation codes under the same conditions and to compare them. Methods: In-house Monte Carlo codes, MCEP-PET and MCEP-SPECT, were employed to simulate images...
2018: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/29333463/characteristics-of-smoothing-filters-to-achieve-the-guideline-recommended-positron-emission-tomography-image-without-harmonization
#17
Yuji Tsutsui, Shinichi Awamoto, Kazuhiko Himuro, Yoshiyuki Umezu, Shingo Baba, Masayuki Sasaki
Objectives: The aim of this study is to examine the effect of different smoothing filters on the image quality and SUVmax to achieve the guideline recommended positron emission tomography (PET) image without harmonization. Methods: We used a Biograph mCT PET scanner. A National Electrical Manufacturers Association (NEMA) the International Electrotechnical Commission (IEC) body phantom was filled with 18F solution with a background activity of 2.65 kBq/mL and a sphere-to-background ratio of 4...
2018: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/29333372/ghost-cell-odontogenic-carcinoma-on-right-mandible-and-its-respective-surgical-reconstruction-a-case-report
#18
Sang Yoon Park, Joonhyoung Park, Do Hyun Kwon, Jae Ho Jeon, Soung Min Kim, Hoon Myoung, Jong Ho Lee
Calcifying cystic odontogenic tumor (CCOT) is defined as an odontogenic cyst-like benign neoplasm that characteristically contains several ghost cells, ameloblastoma-like epithelium, and occasional calcification. Ghost cell odontogenic carcinoma (GCOC), a malignant form of CCOT, is an exceptionally rare malignant tumor. In this report, we present a case of a 53-year-old man whose chief complaint was a solitary mass on the right mandible area. The mass was completely removed through an extraoral surgical approach and reconstructive surgery was performed in two phases...
December 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29333354/novel-wavelet-based-segmentation-of-prostate-cbct-images-with-implanted-calypso-transponders
#19
Yingxia Liu, Ziad Saleh, Yulin Song, Maria Chan, Xiang Li, Chengyu Shi, Xin Qian, Xiaoli Tang
Segmentation of prostate Cone Beam CT (CBCT) images is an essential step towards real-time adaptive radiotherapy (ART). It is challenging for Calypso patients, as more artifacts generated by the beacon transponders are present on the images. We herein propose a novel wavelet-based segmentation algorithm for rectum, bladder, and prostate of CBCT images with implanted Calypso transponders. For a given CBCT, a Moving Window-Based Double Haar (MWDH) transformation is applied first to obtain the wavelet coefficients...
August 2017: International Journal of Medical Physics, Clinical Engineering and Radiation Oncology
https://www.readbyqxmd.com/read/29333344/the-old-and-the-new-plankton-ecological-replacement-of-associations-of-mollusc-plankton-and-giant-filter-feeders-after-the-cretaceous
#20
Amane Tajika, Alexander Nützel, Christian Klug
Owing to their great diversity and abundance, ammonites and belemnites represented key elements in Mesozoic food webs. Because of their extreme ontogenetic size increase by up to three orders of magnitude, their position in the food webs likely changed during ontogeny. Here, we reconstruct the number of eggs laid by large adult females of these cephalopods and discuss developmental shifts in their ecologic roles. Based on similarities in conch morphology, size, habitat and abundance, we suggest that similar niches occupied in the Cretaceous by juvenile ammonites and belemnites were vacated during the extinction and later partially filled by holoplanktonic gastropods...
2018: PeerJ
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