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https://www.readbyqxmd.com/read/29777893/influence-of-postoperative-o-c2-angle-on-the-development-of-dysphagia-after-occipitocervical-fusion-surgery-results-from-a-retrospective-analysis-and-prospective-validation
#1
Xingwen Wang, Dean Chou, Fengzeng Jian
BACKGROUND: Postoperative dysphagia is a known complication of anterior cervical surgery, but its incidence and possible mechanisms are seldom reported after occipitocervical fusion (OCF). Our objective was to study the relationship between craniocervical alignment and the development of dysphagia after OCF for the treatment of basilar invagination with atlantoaxial instability. METHODS: The study was consisted of a retrospective series and a prospective series...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777890/cortical-activation-changes-in-hirayama-disease-following-anterior-cervical-decompression-and-fusion
#2
Hongli Wang, Yiwei Wu, Jian Song, Jianyuan Jiang, Feizhou Lu, Xiaosheng Ma, Xinlei Xia
BACKGROUND: Spinal cord injury may cause cortical reconstruction. We, therefore, explored thechanges in cortical activation before and after anterior cervical decompression and fusion surgery in patients with Hirayama disease (HD). METHODS: 17 HD cases were performed anterior cervical decompression and fusion surgery. BOLD-fMRI scan was performed preoperatively, 3 months, 6 months and 1 year after surgery. Activated voxels were compared between both hands after adjusting for head motion, slice timing, spatial normalization and image smoothing...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777859/three-dimensional-model-of-the-female-perineum-and-pelvic-floor-muscles
#3
Géraldine Giraudet, Laurent Patrouix, Christian Fontaine, Xavier Demondion, Michel Cosson, Chrystèle Rubod
OBJECTIVE: The anatomy of the perineum and the pelvic diaphragm of woman is complex. A numerical complete three-dimensional (3D) model of every muscle of the woman pelvis doesn't exist. The pathophysiology of genital prolapse is still debated. Knowledge of anatomy is essential to better understand its mechanisms. The aim of this research was to build a complete three-dimensional model of the female perineum and pelvic floor muscles. STUDY DESIGN: To model the pelvic muscles we reconstructed them in three dimensions from tracing a magnetic resonance imaging (MRI) of a female pelvis from a cadaver...
May 16, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29777669/repair-of-thoracic-and-thoracoabdominal-mycotic-aneurysms-and-infected-aortic-grafts-using-allograft
#4
Joel S Corvera, David Blitzer, Hannah Copeland, Daniel Murphy, Philip J Hess, Saila T Pillai, John W Fehrenbacher
BACKGROUND: Mycotic aneurysm of the thoracic or thoracoabdominal aorta and infection of thoracic or thoracoabdominal aortic grafts are challenging problems with high mortality. In-situ reconstruction with cryopreserved allograft(CPA) avoids placement of prosthetic material in an infected field and avoids suppressive antibiotics or autologous tissue coverage. METHODS: Fifty consecutive patients with infection of a thoracic or thoracoabdominal aortic graft or mycotic aneurysm underwent resection and replacement with CPA from 2006 to 2016...
May 16, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29776771/association-between-pain-severity-and-clinicohistopathologic-findings-in-the-mandibular-canal-and-inferior-alveolar-nerve-of-patients-with-advanced-mandibular-osteoradionecrosis
#5
Yujiro Hiraoka, Masaya Akashi, Satoshi Wanifuchi, Junya Kusumoto, Manabu Shigeoka, Takumi Hasegawa, Kazunobu Hashikawa, Hiroto Terashi, Takahide Komori
OBJECTIVE: Pain is one of the most problematic symptoms in patients with osteoradionecrosis of the jaws. This study investigated the associations between pain severity and morphologic alterations of the mandibular canal and inferior alveolar nerve, in respective computerized tomography images and resected specimens of mandibular osteoradionecrosis. STUDY DESIGN: We assessed 14 lesions in 13 patients who underwent segmental mandibulectomy for surgical debridement and simultaneous reconstruction with free fibula flap (1 patient exhibited bilateral lesions)...
April 16, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29775982/the-supraclavicular-artery-perforator-flap-a-comparative-study-of-imaging-techniques-used-in-preoperative-mapping
#6
Hemin Oathman Sheriff, Kawa Abdullah Mahmood, Nzar Hamawandi, Aram Jamal Mirza, Jawad Hawas, Esther Granell Moreno, Juan Antonio Clavero, Christopher Hankins, Jaume Masia
BACKGROUND:  The supraclavicular artery flap is an excellent flap for head and neck reconstruction. The aim of this study is to assess imaging techniques to define the precise vascular boundaries of this flap. METHODS:  Six imaging techniques were used for supraclavicular artery mapping in 65 cases; handheld Doppler, triplex ultrasound, computed tomography angiography, magnetic resonance angiography, digital subtraction angiography, and indocyanine green angiography...
May 18, 2018: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/29775913/mobile-phone-based-evaluation-of-latent-tuberculosis-infection-proof-of-concept-for-an-integrated-image-capture-and-analysis-system
#7
Safa Naraghi, Tinashe Mutsvangwa, René Goliath, Molebogeng X Rangaka, Tania S Douglas
BACKGROUND: The tuberculin skin test is the most widely used method for detecting latent tuberculosis infection in adults and active tuberculosis in children. We present the development of a mobile-phone based screening tool for measuring the tuberculin skin test induration. METHOD: The tool makes use of a mobile application developed on the Android platform to capture images of an induration, and photogrammetric reconstruction using Agisoft PhotoScan to reconstruct the induration in 3D, followed by 3D measurement of the induration with the aid of functions from the Python programming language...
May 8, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29775653/atomic-structure-of-a-rationally-engineered-gene-delivery-vector-aav2-5
#8
Matthew Burg, Claire Rosebrough, Lauren M Drouin, Antonette Bennett, Mario Mietzsch, Paul Chipman, Robert McKenna, Duncan Sousa, Mark Potter, Barry Byrne, R Jude Samulski, Mavis Agbandje-McKenna
AAV2.5 represents the first structure-guided in-silico designed Adeno-associated virus (AAV) gene delivery vector. This engineered vector combined the receptor attachment properties of AAV serotype 2 (AAV2) with the muscle tropic properties of AAV1, and exhibited an antibody escape phenotype because of a modified antigenic epitope. To confirm the design, the structure of the vector was determined to a resolution of 2.78 Å using cryo-electron microscopy and image reconstruction. The structure of the major viral protein (VP), VP3, was ordered from residue 219 to 736, as reported for other AAV structures, and the five AAV2...
May 15, 2018: Journal of Structural Biology
https://www.readbyqxmd.com/read/29775162/validation-of-prone-intraoperative-measurements-of-global-spinal-alignment
#9
Max Vaynrub, Brandon P Hirsch, Jared Tishelman, Dennis Vasquez-Montes, Aaron J Buckland, Thomas J Errico, Themistocles S Protopsaltis
OBJECTIVE Verifying the adequacy of surgical correction of adult spinal sagittal deformity (SSD) leads to improved postoperative alignment and clinical outcomes. Traditionally, surgeons relied on intraoperative measurements of lumbar lordosis (LL) correction. However, T-1 pelvic angle (TPA) and its component angles more reliably predict postoperative alignment. While TPA is readily measured on standing radiographs, intraoperative radiographs offer poor resolution of the bicoxofemoral axis. A method to recreate this radiographic landmark by extrapolating preoperative measurements has been described...
May 18, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29774974/stiffness-reconstruction-methods-for-mr-elastography
#10
Daniel Fovargue, David Nordsletten, Ralph Sinkus
Assessment of tissue stiffness is desirable for clinicians and researchers, as it is well established that pathophysiological mechanisms often alter the structural properties of tissue. Magnetic resonance elastography (MRE) provides an avenue for measuring tissue stiffness and has a long history of clinical application, including staging liver fibrosis and stratifying breast cancer malignancy. A vital component of MRE consists of the reconstruction algorithms used to derive stiffness from wave-motion images by solving inverse problems...
May 18, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29774924/fluorescence-resonance-energy-transfer-fret-based-nanoparticles-composed-of-aie-luminogens-and-nir-dyes-with-enhanced-three-photon-near-infrared-emission-for-in-vivo-brain-angiography
#11
Wen Liu, Yalun Wang, Xiao Han, Ping Lu, Liang Zhu, Chaowei Sun, Jun Qian, Sailing He
Near-infrared (NIR) fluorescence is very important for high-contrast biological imaging of high-scattering tissues such as brain tissue. Unfortunately, commercial NIR dyes are excited usually by visible light, and their multi-photon absorption (MPA) cross-sections are small. Here, we design new co-encapsulated NIR nanoparticles (NPs) with a large three-photon (3PA) absorption cross-section. A form of aggregation-induced emission (AIE) luminogen (AIEgen), 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN), is introduced as the donor, and a form of NIR dye, silicon 2,3-naphthalocyanine bis-(trihexylsilyloxide) (NIR775), is adopted as the acceptor...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29774790/clear-cell-chondrosarcoma-with-chondroblastoma-like-features-a-case-for-team-diagnosis
#12
Ryan M Kiefer, John Wojcik, Kumarasen Cooper, Kristy L Weber, Ronnie Sebro
Clear cell chondrosarcoma (CCCS) is a rare variant of conventional chondrosarcoma with low-grade malignant features that may be confused radiographically and histologically with chondroblastoma. We report a case of a 50-year-old female who presented with 6 months of left hip pain. Initial radiographs demonstrated an osteolytic lesion with adjacent area of sclerosis in the proximal left femur. Magnetic resonance imaging demonstrated a marrow-infiltrative lesion with periosteal reaction and thickened enhancing periosteum...
May 1, 2018: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29774634/study-of-hyperpigmentation-in-human-skin-disorder-using-different-electron-microscopy-techniques
#13
Seulgi Noh, Hyosun Choi, Ji Soo Kim, Il-Hwan Kim, Ji Young Mun
There is a global trend of increase in the demand for three-dimensional electron microscopy with high resolution. The ultrastructural change and related functional studies are necessary to investigate biological phenomena. In this study, currently available 3D reconstruction techniques of electron microscopes (serial block-face scanning electron microscopy and focused ion beam-scanning electron microscopy) were used to investigate hyperpigmentary disorders in human skin. In the basal layer of the epidermis in the human skin, there are melanocytes that produce melanin and keratinocytes that act as a barrier against environmental damage...
May 18, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29774597/assessment-of-the-generalization-of-learned-image-reconstruction-and-the-potential-for-transfer-learning
#14
Florian Knoll, Kerstin Hammernik, Erich Kobler, Thomas Pock, Michael P Recht, Daniel K Sodickson
PURPOSE: Although deep learning has shown great promise for MR image reconstruction, an open question regarding the success of this approach is the robustness in the case of deviations between training and test data. The goal of this study is to assess the influence of image contrast, SNR, and image content on the generalization of learned image reconstruction, and to demonstrate the potential for transfer learning. METHODS: Reconstructions were trained from undersampled data using data sets with varying SNR, sampling pattern, image contrast, and synthetic data generated from a public image database...
May 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29773714/the-bendy-basilar-progressive-aneurysm-tilting-and-arterial-deformation-can-be-a-delayed-outcome-after-coiling-of-large-basilar-apex-aneurysms
#15
Ansaar T Rai, Abdul R Tarabishy, SoHyun Boo, Jeffrey S Carpenter, Sanjay Bhattia
BACKGROUND: Morphological changes in the basilar artery and the artery-aneurysm relationship following coiling of large basilar apex aneurysms may induce morbidity. METHODS: The basilar artery radius-of-curvature was measured along its center line on volumetrically reconstructed images formatted along the plane of curvature. The aneurysm-tilt-angle was measured between the distal basilar and the vertical long axis of the aneurysm. The measurements were compared between small (<10 mm) and large (≥10 mm) aneurysms on baseline and follow-up studies...
May 17, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29772676/three-dimensional-terahertz-coded-aperture-imaging-based-on-geometric-measures
#16
Shuo Chen, Xiaoqiang Hua, Hongqiang Wang, Chenggao Luo, Yongqiang Cheng, Bin Deng
For synthetic aperture radars, it is difficult to achieve forward-looking and staring imaging with high resolution. Fortunately, terahertz coded-aperture imaging (TCAI), an advanced radar imaging technology, can solve this problem by producing various irradiation patterns with coded apertures. However, three-dimensional (3D) TCAI has two problems, including a heavy computational burden caused by a large-scale reference signal matrix, and poor resolving ability at low signal-to-noise ratios (SNRs). This paper proposes a 3D imaging method based on geometric measures (GMs), which can reduce the computational burden and achieve high-resolution imaging for low SNR targets...
May 16, 2018: Sensors
https://www.readbyqxmd.com/read/29772066/3d-specific-absorption-rate-estimation-from-high-intensity-focused-ultrasound-sonications-using-the-green-s-function-heat-kernel
#17
Nicholas J Freeman, Henrik Odéen, Dennis L Parker
PURPOSE: Evaluate a numerical inverse Green's function method of deriving specific absorption rates (SARs) from high intensity focused ultrasound (HIFU) sonications given tissue parameters (thermal conductivity, specific heat capacity, and mass density) and 3-D magnetic resonance imaging (MRI) temperature measurements. METHODS: SAR estimates were evaluated using simulations and MR temperature measurements from HIFU sonications. For simulations, a "true" SAR was calculated using the hybrid angular spectrum method for ultrasound simulations...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29772058/technical-note-interleaved-bipolar-acquisition-and-low-rank-reconstruction-for-water-fat-separation-in-mri
#18
JaeJin Cho, HyunWook Park
PURPOSE: To acquire interleaved bipolar data and reconstruct the full data using low-rank property for water fat separation. METHODS: Bipolar acquisition suffers from issues related to gradient switching, the opposite gradient polarities, and other system imperfections, which prevent accurate water-fat separation. In this study, an interleaved bipolar acquisition scheme and a low-rank reconstruction method were proposed to reduce issues from the bipolar gradients while achieving a short imaging time...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29771842/perceived-esthetic-outcomes-of-face-transplantation-a-survey-of-the-general-public
#19
Alessandra E Cabrera, Laura L Kimberly, Rami S Kantar, Elisa K Atamian, Amit K Manjunath, Lauren K Rangel, Michelle W McQuinn, J Rodrigo Diaz-Siso, Eduardo D Rodriguez
Facial transplantation (FT) has attracted the interest of individuals with facial disfigurement as a path to social reintegration. The perception among face transplant recipients and the reconstructive surgery community appears to be that superior functional and esthetic outcomes can be obtained with FT compared to autologous reconstruction (AR). Although lifelong immunosuppression adds well-known risks to FT, its benefits have proven difficult to quantify, especially because of its non-life-saving nature. Evidence that the general public perceives facial allograft recipients as less disfigured than AR patients may dramatically alter the currently accepted risk/benefit ratio of this novel procedure...
May 15, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29771841/integrating-a-profile-of-frontal-face-with-its-mirror-image-for-facial-reconstruction
#20
Paramjit Kaur, Kewal Krishan, Suresh K Sharma, Tanuj Kanchan
INTRODUCTION AND OBJECTIVES: Face recognition plays an important role in the field of biometrics, bioinformatics, and forensic identification. Human faces appear bilaterally symmetric. However, asymmetry is a norm in the human body and careful morphological and metric examination of the human face gives an exact idea of the asymmetry present in the face of an individual. Most of the studies on asymmetry of human face have been carried out with regard to evaluation of expressions in psychology, anthropology, and biometrics...
May 15, 2018: Journal of Craniofacial Surgery
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