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https://www.readbyqxmd.com/read/29223565/compressively-sampled-mr-image-reconstruction-using-generalized-thresholding-iterative-algorithm
#1
Sana Elahi, Muhammad Kaleem, Hammad Omer
Compressed sensing (CS) is an emerging area of interest in Magnetic Resonance Imaging (MRI). CS is used for the reconstruction of the images from a very limited number of samples in k-space. This significantly reduces the MRI data acquisition time. One important requirement for signal recovery in CS is the use of an appropriate non-linear reconstruction algorithm. It is a challenging task to choose a reconstruction algorithm that would accurately reconstruct the MR images from the under-sampled k-space data...
November 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29222837/low-melt-bioactive-glass-reinforced-3d-printing-akermanite-porous-cages-with-highly-improved-mechanical-properties-for-lumbar-spinal-fusion
#2
Xiurong Ke, Lei Zhang, Xianyan Yang, Juncheng Wang, Chen Zhuang, Zhouwen Jin, An Liu, Tengfei Zhao, Sanzhong Xu, Changyou Gao, Zhongru Gou, Guojing Yang
Although great strides have been made in medical technology, low back/neck pain and intervertebral disc degeneration initiated from disc degenerative disease remains a clinical challenge. Within the field of regenerative medicine therapy, we have sought to improve the biomechanical transformation of spinal fusion procedures conducted using biodegradable porous implants. Specifically, we have focused on developing mechanically strong bioceramic cages for spinal fusion and functional recovery. Herein we fabricated the akermanite (AKE) ceramic-based porous cages using low-melting bioactive glass (BG) and 3D printing technology...
December 9, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29219607/passive-linearization-of-the-magnetic-bunch-compression-using-self-induced-fields
#3
G Penco, E Allaria, I Cudin, S Di Mitri, D Gauthier, S Spampinati, M Trovó, L Giannessi, E Roussel, S Bettoni, P Craievich, E Ferrari
In linac-driven free-electron lasers, colliders, and energy recovery linacs, a common way to compress the electron bunch to kiloampere level is based upon the implementation of a magnetic dispersive element that converts particle energy deviation into a path-length difference. Nonlinearities of such a process are usually compensated by enabling a high harmonic rf structure properly tuned in amplitude and phase. This approach is however not straightforward, e.g., in C-band and X-band linacs. In this Letter we demonstrate that the longitudinal self-induced field excited by the electron beam itself is able to linearize the compression process without any use of high harmonic rf structure...
November 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29216947/-effects-of-active-abdominal-compression-decompression-cpr-on-oxygen-metabolism-and-prognosis-in-patients-with-cardiac-arrest
#4
Xin Sha, Sisen Zhang, Hongwei Wang, Yingxin Cen, Wei Song, Jing Li, Lixiang Wang
OBJECTIVE: To analyze the effect of active abdominal compression-decompression cardiopulmonary resuscitation (AACD-CPR) and standard cardiopulmonary resuscitation (STD-CPR) on oxygen metabolism and prognosis of patient with cardiac arrest (CA), and to evaluate the treatment effect of AACD-CPR. METHODS: Patients with CA, CA time less than 30 minutes, and without STD-CPR and AACD-CPR contraindications admitted to the Zhengzhou People's Hospital from October 1st 2015 to May 31st 2017 were enrolled...
December 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29209845/energy-efficiency-of-acetone-butanol-and-ethanol-abe-recovery-by-heat-integrated-distillation
#5
Victor Hugo Grisales Diaz, Gerard Olivar Tost
Acetone, butanol, and ethanol (ABE) is an alternative biofuel. However, the energy requirement of ABE recovery by distillation is considered elevated (> 15.2 MJ fuel/Kg-ABE), due to the low concentration of ABE from fermentation broths (between 15 and 30 g/l). In this work, to reduce the energy requirements of ABE recovery, four processes of heat-integrated distillation were proposed. The energy requirements and economic evaluations were performed using the fermentation broths of several biocatalysts...
December 5, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29208270/nano-fibrous-and-ladder-like-multi-channel-nerve-conduits-degradation-and-modification-by-gelatin
#6
Sheng Liu, Xiumin Sun, Tao Wang, Shihao Chen, Chen-Guang Zeng, Gaoyi Xie, Qingtang Zhu, Xiaolin Liu, Daping Quan
We recently fabricated multi-channel PLLA nerve conduits (NCs, conduits diameter: ~3mm, channels diameter: ~200μm) with nano-fibrous microstructure (NNCs) and ladder-like microstructure (LNCs), and found the nanofibers in the NNCs promote differentiation of nerve stem cells (NSCs) into neurons. In the present study, we evaluated the degradation profile of NNCs and LNCs, and observed that NNCs degraded too fast to implant. To delay the degradation and retain the nano-scale effect of NNCs, we used gelatin to wrap (2% w/v gelatin) or embed (8% w/v gelatin) NNCs and LNCs via vacuum infusion and chemical cross-linking with genipin...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29196042/multilayer-polyion-complex-nanoformulations-of-superoxide-dismutase-1-for-acute-spinal-cord-injury
#7
N V Nukolova, A D Aleksashkin, T O Abakumova, A Y Morozova, I L Gubskiy, Е А Kirzhanova, M A Abakumov, V P Chekhonin, N L Klyachko, A V Kabanov
As one of the most devastating forms of trauma, spinal cord injury (SCI) remains a challenging clinical problem. The secondary processes associated with the primary injury, such as overproduction of reactive oxygen species (ROS) and inflammation, lead to concomitant compression of the injured spinal cord and neuronal death. Delivery of copper-zinc superoxide dismutase (SOD1), an efficient ROS scavenger, to the site of injury can mitigate SCI-induced oxidative stress and tissue damage. Towards this goal catalytically active nanoformulations of SOD1 ("nanozymes") are developed as a modality for treatment of SCI...
November 28, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29181341/odontoideum-bone-revealed-by-c1-c2-dislocation-of-the-cervical-spine-during-a-diving-accident
#8
Lassaad Hassini, Mohamed Ali Khalifa, Zeineb Alaya, Mohamed Laaziz Ben Ayeche, Walid Osman, Mourad Mtaoumi
Introduction: Odontoideum bone or the mobile odontoid process is one of the rarest malformations of the cervico-occipital hinge. It exposes to the atlo-axial instability and to the risk of bulbo-medullary compression threatening then the vital and functional prognosis. We report the case of a 16-year-old patient who was the victim of a raod accident resulting in acervical spine injury. Radiological investigation found an odontoideum bone malformation associated with C1C2 dislocation. Case Report: A 16-year-old patient with no medical history had a road accident...
July 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29168288/robotic-strong-s-procedure-for-the-treatment-of-superior-mesenteric-artery-syndrome-description-of-surgical-technique-on-occasion-of-the-first-reported-case-in-the-literature
#9
Harilaos Konstantinidis, Christos Charisis, Panagiotis Kottos
BACKROUND: Superior Mesenteric Artery Syndrome (SMAS) is a rare disorder caused by compression of the third portion of the duodenum by the SMA. Once a conservative approach fails, usual surgical strategies include Duodenojejunostomy and Strong's procedure. The latter avoids potential anastomotic risks and complications. Robotic Strong's procedure (RSP) combines both the benefits of a minimal invasive approach and also enchased robotic accuracy and efficacy. METHODS: For a young girl who was unsuccessfully treated conservatively, the paper describes the RSP surgical technique...
November 23, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/29164022/impact-of-baseline-magnetic-resonance-imaging-on-neurologic-functional-and-safety-outcomes-in-patients-with-acute-traumatic-spinal-cord-injury
#10
REVIEW
Shekar Kurpad, Allan R Martin, Lindsay A Tetreault, Dena J Fischer, Andrea C Skelly, David Mikulis, Adam Flanders, Bizhan Aarabi, Thomas E Mroz, Eve C Tsai, Michael G Fehlings
Study Design: Systematic review. Objective: To perform a systematic review to evaluate the utility of magnetic resonance imaging (MRI) in patients with acute spinal cord injury (SCI). Methods: An electronic search of Medline, EMBASE, the Cochrane Collaboration Library, and Google Scholar was conducted for literature published through May 12, 2015, to answer key questions associated with the use of MRI in patients with acute SCI. Results: The literature search yielded 796 potentially relevant citations, 8 of which were included in this review...
September 2017: Global Spine Journal
https://www.readbyqxmd.com/read/29155254/association-of-riluzole-and-dantrolene-improves-significant-recovery-after-acute-spinal-cord-injury-in-rats
#11
Bernardo De Caro Martins, Bruno Benetti Junta Torres, Karen Maciel de Oliveira, Mario Sergio Lavor, Carla Maria Osório, Fabiola Bono Fukushima, Isabel Rodrigues Rosado, Eliane Gonçalves de Melo
BACKGROUND CONTEXT: Damage to the spinal cord can result in irreversible impairment or complete loss of motor, sensory, and autonomic functions. Riluzole and dantrolene have been shown to provide neuroprotection by reducing neuronal apoptosis after brain and spinal cord injury (SCI) in several animal models of neurological disorders. As these drugs protect the injured spinal cord through different mechanisms, we investigated the cumulative effects of riluzole and dantrolene. PURPOSE: This study aimed to investigate the neuroprotective efficacy of the combined administration of riluzole and dantrolene in experimental thoracic SCI...
November 15, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29154895/nonrigid-motion-compensation-in-compressed-sensing-reconstruction-of-cardiac-cine-mri
#12
Azar Tolouee, Javad Alirezaie, Paul Babyn
In this work, a robust nonrigid motion compensation approach, is applied to the compressed sensing reconstruction of dynamic cardiac cine MRI sequences. Respiratory and cardiac motion separation coupled with a registration algorithm is used to provide accurate reconstruction of dynamic cardiac images. The proposed scheme employs a variable splitting based optimization strategy to enable joint motion estimation along with reconstruction. We define the recovery as an energy minimization scheme utilizing an objective function that combines data consistency, spatial smoothness, and motion penalties...
November 14, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29145287/transforaminal-endoscopy-in-lumbar-burst-fracture-a-case-report
#13
Yuanyi Wang, Cong Ning, Liyu Yao, Xiuying Huang, Chengliang Zhao, Bin Chen, Nan Zhang
RATIONALE: Lumbar burst fractures are frequent injury resulting from high-energy trauma, and the patients suffer from pain and the neurologic dysfunction. Although minimally invasive techniques have advanced rapidly, it was the first time to apply transforaminal endoscopic combined with percutaneous pedicle screw fixation to treatment of lumbar burst fractures. PATIENT CONCERNS: A 33-year-old man underwent Magerl type A3.1 burst fracture at L2 and compression fractures at L3 due to falling from a height with severe lower back pain, sensory loss, and atony of the right leg...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29140761/limb-segment-load-inhibits-the-recovery-of-soleus-h-reflex-after-segmental-vibration-in-humans
#14
Shih-Chiao Tseng, Richard K Shields
We investigated the effects of vertical vibration and compressive load on soleus H-reflex amplitude and postactivation depression. We hypothesized that, in the presence of a compressive load, limb vibration induces a longer suppression of soleus H-reflex. Eleven healthy adults received vibratory stimulation at a fixed frequency (30 Hz) over two loading conditions (0% and 50% of individual's body weight). H-reflex amplitude was depressed ∼88% in both conditions during vibration. Cyclic application of compression after cessation of the vibration caused a persistent reduction in H-reflex excitability and postactivation depression for > 2...
November 15, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/29136734/-functional-recovery-after-recurrent-laryngeal-nerve-injury-on-different-electromyography-thresholds-during-thyroid-surgery
#15
X L Liu, C L Li, Y S Zhao, H Sun
Objective: To discuss the functional recovery after recurrent laryngeal nerve injury (RLNI) on different electromyography thresholds during thyroid surgery. Methods: The prospective experimentally were induced in 12 acute recurrent laryngeal traction animals (porcine) from December 2014 to December 2015, the amplitude and latency of electromyography, even time course during RLNI and recovery of 24 recurrent laryngeal nerves(RLN) were continuous intraoperative neuromonitoring(IONM), including 12 RLN releasing traction after 50% amplitude decrease (AD) and other 12 RLN after 70% AD...
November 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29132725/computational-study-of-the-role-of-fluid-content-and-flow-on-the-lumbar-disc-response-in-cyclic-compression-replication-of-in-vitro-and-in-vivo-conditions
#16
Petra Velísková, Maxim Bashkuev, Aboulfazl Shirazi-Adl, Hendrik Schmidt
The intervertebral disc viscoelastic response is governed primarily by its fluid content and flow. Invivo measurements demonstrate that the disc volume, fluid content, height and nucleus pressure completely recover during resting even after diurnal loading with twice longer duration (16 vs. 8 h). In view of much longer periods required for the recovery of disc height and pressure in vitro, concerns have been raised on the fluid inflow through the endplates that might be hampered by clogged blood vessels post mortem...
November 3, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29129769/retrosigmoid-intradural-suprameatal-inframeatal-approach-for-complete-surgical-removal-of-a-giant-recurrent-vestibular-schwannoma-with-severe-petrous-bone-involvement-technical-case-report
#17
Yosuke Sato, Tohru Mizutani, Katsuyoshi Shimizu, Hans-Joachim Freund, Madjid Samii
BACKGROUND: Surgical removal of giant vestibular schwannomas with severe petrous bone involvement remains challenging due to the high risk of complications. The retrosigmoid intradural suprameatal-inframeatal approach (RISIA) allows for safe exposure extending from Meckel's cave to the petrous internal carotid artery (ICA). CLINICAL DESCRIPTION: A 27-year-old man presented with recurrence of a giant vestibular schwannoma (4.5 cm) invading Meckel's cave and the left petrous ICA...
November 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29122964/enhanced-muscle-blood-flow-with-intermittent-pneumatic-compression-of-the-lower-leg-during-plantar-flexion-exercise-and-recovery
#18
Kathryn A Zuj, Chekema N Prince, Richard L Hughson, Sean D Peterson
This study tested the hypothesis that intermittent compression of the lower limb would increase blood flow during exercise and post-exercise recovery. Data were collected from 12 healthy individuals (8 men) who performed three minutes of standing plantar flexion exercise. Three conditions were tested: no applied compression (NoComp), compression during the exercise period only (ExComp), and compression during two minutes of standing post-exercise recovery (RecComp). Doppler ultrasound was used to determine superficial femoral artery (SFA) blood flow responses...
November 9, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29122527/implementation-of-enhanced-recovery-programs-for-bariatric-surgery-results-from-the-francophone-large-scale-database
#19
Anissa Deneuvy, Karem Slim, Maxime Sodji, Pierre Blanc, Denis Gallet, Marie-Cécile Blanchet
BACKGROUND: The feasibility, safety, and efficacy of programs for enhanced recovery after bariatric surgery (ERABS) are now well established. However, data concerning their large-scale implementation remain insufficient. OBJECTIVES: The objective of the present study was to review the multicenter implementation of ERABS SETTING: This retrospective analysis of a prospective database was conducted in 15 Groupe francophone de Rehabilitation Améliorée après ChirurgiE centers from data from March 2014 to January 2017...
October 4, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/29119040/giant-mucopyocele-associated-with-intracranial-hypertension-case-report-and-literature-review
#20
Maick Willen Fernandes Neves, Luis Otavio Carneiro Pontelli, Luiz Gustavo de Abreu Mattos, Mariana Mazzuia Guimarães, Telmo Augusto Barba Belsuzarri, Tiago Fernandes Gonçales, Wolnei Marques Zeviani, Paulo Henrique Pires de Aguiar, João Flavio Mattos Araújo
Background: Mucoceles are epithelial lined sacs that contain mucous. Eventually, they can be infected and so called mucopyoceles, which are usually slow growing lesions with common bone destruction located in the facial sinus. Mucoceles show multivariate etiology and occur between the fourth and seventh decade of life. Case Description: Patient, 55-year-old, female, was referred unconscious with Cushing's triad to our department; she had fever since four days. The findings of skull computer tomography highlighted a large bifrontal lesion with an invasion of the rear wall of the frontal sinus, compression of the frontal lobes, and midline deviation...
2017: Surgical Neurology International
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