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https://www.readbyqxmd.com/read/28227349/automated-embolic-signal-detection-using-adaptive-gain-control-and-classification-using-anfis
#1
Praotasna Sombune, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong, Charturong Tantibundhit, Praotasna Sombune, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong, Charturong Tantibundhit, Praotasna Sombune, Charturong Tantibundhit, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong
This work proposes an automated system for real-time high-accuracy detection of cerebral embolic signals (ES) to couple with transcranial Doppler ultrasound (TCD) devices in diagnosing a risk of stroke. The algorithm employs Adaptive Gain Control (AGC) approach to capture suspected ESs in real-time. Then, Adaptive Wavelet Packet Transform (AWPT) and Fast Fourier Transform (FFT) are used to extract from them features most efficiently representing ES, which determined by Sequential Feature Selection technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227067/computational-estimation-of-the-severity-of-coronary-lesions-with-intravascular-ultrasound-images-a-pilot-study
#2
Panagiotis K Siogkas, Michail I Papafaklis, Bill D Gogas, Habib Samady, Lampros K Michalis, Dimitrios I Fotiadis, Panagiotis K Siogkas, Michail I Papafaklis, Bill D Gogas, Habib Samady, Lampros K Michalis, Dimitrios I Fotiadis, Bill D Gogas, Habib Samady, Michail I Papafaklis, Dimitrios I Fotiadis, Panagiotis K Siogkas, Lampros K Michalis
The fast and accurate hemodynamic functional assessment of the coronary vasculature is of utmost importance in clinical practice due to the fact that Cardiovascular Diseases have become the leading cause of death globally. In this work we propose a novel method that combines two of the most efficient methods of hemodynamic status assessment of coronary arteries, Intravascular UtraSound and virtual Functional Assessment Index, an index that correlates well to the measured Fractional Flow Reserve. One Left Anterior Descending segment was reconstructed both in a straight manner (using only IVUS images) as well as using the actual 3D geometry of the vessel (using IvUS images combined with the respective coronary angiographic images [2])...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226690/polarity-detection-in-ultrasound-current-source-density-imaging
#3
Zhaohui Wang, Wei-Da Hao, Chung S Leung, Sung-Won Park, Zhaohui Wang, Wei-Da Hao, Chung S Leung, Sung-Won Park, Chung S Leung, Zhaohui Wang, Sung-Won Park, Wei-Da Hao
Modulating the electric dipole field with ultrasound pulse, ultrasound current source density imaging (UCSDI) can detect current direction and form spatial 3D imaging of dipole changing in one period of treatment. As ultrasound pulse passes through the conductive media, it convolves/correlates with the inner product of the electric field of a dipole and lead field of a pair of detectors, making the shifting frequency of polarity lower than the center frequency of the ultrasound pulse. After acoustoelectric (AE) signal is shifted to base band, the AE voltage is positive at anode and negative at cathode...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224900/chemical-oxygen-demand-historical-perspectives-and-future-challenges
#4
REVIEW
René Bernard Geerdink, Ricardo Sebastiaan van den Hurk, Onno Jacob Epema
Determining the chemical oxygen demand (COD) is challenging because of the chemicals that are used in the current methods. There is an urgent need to determine the pollution in surface waters from (heavy) industry via a simple, reliable and fast method. However, the current procedures use hazardous chemicals, such as mercury, to suppress chloride interferences. This challenge has not been resolved. The introduction of modern detection techniques, such as chemiluminescence and oxidation procedures, e.g., microwave and ultrasound dissolution, has not resulted in a breakthrough...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28219805/fusion-of-spatial-gray-level-dependency-and-fractal-texture-features-for-the-characterization-of-thyroid-lesions
#5
U Raghavendra, U Rajendra Acharya, Anjan Gudigar, Jen Hong Tan, Hamido Fujita, Yuki Hagiwara, Filippo Molinari, Pailin Kongmebhol, Kwan Hoong Ng
Thyroid is a small gland situated at the anterior side of the neck and one of the largest glands of the endocrine system. The abrupt cell growth or malignancy in the thyroid gland may cause thyroid cancer. Ultrasound images distinctly represent benign and malignant lesions, but accuracy may be poor due to subjective interpretation. Computer Aided Diagnosis (CAD) can minimize the errors created due to subjective interpretation and assists to make fast accurate diagnosis. In this work, fusion of Spatial Gray Level Dependence Features (SGLDF) and fractal textures are used to decipher the intrinsic structure of benign and malignant thyroid lesions...
February 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28214489/ablation-of-the-great-saphenous-vein-with-nontumescent-n-butyl-cyanoacrylate-versus-endovenous-laser-therapy
#6
İsmail Koramaz, Helin El Kılıç, Fatih Gökalp, Macit Bitargil, Nilüfer Bektaş, Ersoy Engin, Mehmet Taşkın Egici, Ahmet Kürşat Bozkurt
OBJECTIVE: The endovenous application of n-butyl cyanoacrylate (NBCA) is a new nontumescent ablation technique for the treatment of venous insufficiency. The aim of this study was to retrospectively compare an NBCA-based ablation method with endovenous laser ablation (EVLA) for the management of incompetent great saphenous veins. METHODS: Between May 2013 and August 2014, there were 339 patients with incompetent varicose veins who were treated with either the endovenous application of NBCA (VariClose Vein Sealing System [VVSS]; Biolas, Ankara, Turkey) or EVLA...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28213230/the-pentafluorophenyl-stationary-phase-shows-a-unique-separation-efficiency-for-performing-fast-chromatography-determination-of-highbush-blueberry-anthocyanins
#7
Barbora Šmídová, Dalibor Šatínský, Kateřina Dostálová, Petr Solich
A high-performance liquid chromatography method using an alternative pentafluorophenyl (PFP) core-shell stationary phase has been developed and used for rapid separation of 23 anthocyanins in a highbush blueberry Bluehaven cultivar. A high efficiency of separation of anthocyanins was achieved in the core-shell column Kinetex PFP, 150×4.6mm (particle size 2.6µm) with a 5×4.6mm precolumn, using a simple linear gradient elution with a mobile phase of acetonitrile and a water solution of 2% formic acid at a flow rate of 1...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28210824/ultrasound-palpation-for-fast-in-situ-quantification-of-articular-cartilage-stiffness-thickness-and-relaxation-capacity
#8
M Schöne, R M Schulz, H Tzschätzsch, P Varga, K Raum
Most current cartilage testing devices require the preparation of excised samples and therefore do not allow intra-operative application for diagnostic purposes. The gold standard during open or arthroscopic surgery is still the subjective perception of manual palpation. This work presents a new diagnostic method of ultrasound palpation (USP) to acquire applied stress and strain data during manual palpation of articular cartilage. With the proposed method, we obtain cartilage thickness and stiffness. Moreover, repeated palpations allow the quantification of relaxation effects...
February 16, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28210364/caudal-edge-of-the-liver-in-the-right-upper-quadrant-ruq-view-is-the-most-sensitive-area-for-free-fluid-on-the-fast-exam
#9
Viveta Lobo, Michelle Hunter-Behrend, Erin Cullnan, Rebecca Higbee, Caleb Phillips, Sarah Williams, Philips Perera, Laleh Gharahbaghian
INTRODUCTION: The focused assessment with sonography in trauma (FAST) exam is a critical diagnostic test for intraperitoneal free fluid (FF). Current teaching is that fluid accumulates first in Morison's pouch. The goal of this study was to evaluate the "sub-quadrants" of traditional FAST views to determine the most sensitive areas for FF accumulation. METHODS: We analyzed a retrospective cohort of all adult trauma patients who had a recorded FAST exam by emergency physicians at a Level I trauma center from January 2012 - June 2013...
February 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28208491/dynamic-shear-jamming-in-dense-granular-suspensions-under-extension
#10
Sayantan Majumdar, Ivo R Peters, Endao Han, Heinrich M Jaeger
Unlike dry granular materials, a dense granular suspension like cornstarch in water can strongly resist extensional flows. At low extension rates, such a suspension behaves like a viscous fluid, but rapid extension results in a response where stresses far exceed the predictions of lubrication hydrodynamics and capillarity. To understand this remarkable mechanical response, we experimentally measure the normal force imparted by a large bulk of the suspension on a plate moving vertically upward at a controlled velocity...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208231/fast-left-ventricle-tracking-using-localized-anatomical-affine-optical-flow
#11
Sandro Queirós, João L Vilaça, Pedro Morais, Jaime C Fonseca, Jan D'hooge, Daniel Barbosa
In daily clinical cardiology practice, left ventricle (LV) global and regional function assessment is crucial for disease diagnosis, therapy selection and patient follow-up. Currently, this is still a time-consuming task, spending valuable human resources. In this work, a novel fast methodology for automatic LV tracking is proposed based on localized anatomically constrained affine optical flow. This novel method can be combined to previously proposed segmentation frameworks or manually delineated surfaces at an initial frame to obtain fully delineated datasets and, thus, assess both global and regional myocardial function...
February 16, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28205308/fast-and-robust-multimodal-image-registration-using-a-local-derivative-pattern
#12
Dongsheng Jiang, Yonghong Shi, Xinrong Chen, Manning Wang, Zhijian Song
PURPOSE: Deformable multimodal image registration, which can benefit radiotherapy and image guided surgery by providing complementary information, remains a challenging task in the medical image analysis field due to the difficulty of defining a proper similarity measure. This article presents a novel, robust and fast binary descriptor, the discriminative local derivative pattern (dLDP), which is able to encode images of different modalities into similar image representations. METHODS: dLDP calculates a binary string for each voxel according to the pattern of intensity derivatives in its neighborhood...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28204915/-acute-chest-pain-and-new-ecg-changes-in-pacemaker-patients-a%C3%A2-clinical-challenge
#13
Matthias Hoyme, Ralf Surber, P Christian Schulze, Dirk Prochnau
We report the case of a 82-year-old woman who was admitted to our institution with acute chest pain, nausea, and vomiting. Because of atrial fibrillation with intermittent bradycardia, a single-chamber pacemaker was implanted 4 years ago. The initial 12-lead ECG showed atrial fibrillation with a heart rate of 70 bpm, narrow QRS, and T‑wave inversions in the inferolateral leads. Coronary artery disease was excluded by immediate cardiac catheterization. A subsequent ECG three hours later showed a ventricular paced rhythm...
February 15, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28203453/association-of-osteoprotegerin-with-obesity-insulin-resistance-and-non-alcoholic-fatty-liver-disease-in-children
#14
Meltem Erol, Ozlem Bostan Gayret, Hikmet Tekin Nacaroglu, Ozgul Yigit, Oguzhan Zengi, Mehmet Salih Akkurt, Mehmet Tasdemir
BACKGROUND: Osteoprotegerin (OPG) is a member of the tumor necrosis factor superfamily. Reduced OPG levels are related to obesity, insulin resistance, and non-alcoholic fatty liver disease (NAFLD). OBJECTIVES: The aim of this study was to evaluate the relationship between OPG levels, obesity, insulin resistance, and NAFLD in pediatric patients. METHODS: This was a prospective, cross-sectional, controlled study that was conducted in the department of pediatrics at Bagcilar training and research hospital in Istanbul, Turkey, between April and August 2015...
November 2016: Iranian Red Crescent Medical Journal
https://www.readbyqxmd.com/read/28203021/-comparision-for-clinical-efficiency-of-continuous-adductor-canal-block-and-femoral-nerve-block-in-total-knee-arthroplasty
#15
M W Zhao, N Wang, L Zeng, M Li, Z K Zhao, H Zhang, H Tian
OBJECTIVE: To compare the pain control efficiency of continuous adductor canal block (ACB) and femoral nerve block (FNB) in total knee arthroplasty. METHODS: From April to September 2016, patients with severe knee osteoarthritis undergoing primary unilateral total knee arthroplasty (TKA) were prospectively observed, and all the patients were randomized received ultrasound-guided continuous ACB or FNB after surgery. Numeric pain rating scales(NPRS)pain scores in rest and activity 2, 6, 12, 24 and 48 h after surgery were collected, and the preoperative and postoperative quadriceps strength at 24 and 48 h were analyzed...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28202584/comparison-of-human-gastrocnemius-forces-predicted-by-hill-type-muscle-models-and-estimated-from-ultrasound-images
#16
Taylor J M Dick, Andrew A Biewener, James M Wakeling
Hill-type models are ubiquitous in the field of biomechanics, providing estimates of a muscle's force as a function of its activation state and its assumed force-length and force-velocity properties. However, despite their routine use, the accuracy with which Hill-type models predict the forces generated by muscles during submaximal, dynamic tasks remains largely unknown. This study compared human gastrocnemii forces predicted by Hill-type models to the forces estimated from ultrasound-based measures of tendon length changes and stiffness during cycling, over a range of loads and cadences...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28183156/a-model-to-predict-the-onset-of-non-alcoholic-fatty-liver-disease-within-two-years-in-elderly-adults
#17
Ya-Jie Lin, Xi-Mei Gao, Wei-Wei Pan, Shuai Gao, Zhen-Zhen Yu, Ping Xu, Xiao-Peng Fan
BACKGROUND AND AIM: Non-alcoholic fatty liver disease (NAFLD) is a common cause of chronic hepatitis, which leads to cirrhosis and hepatocellular carcinoma. However, it is difficult to identify subjects at high risk for NAFLD onset. This study aims to construct a model to predict the onset of NAFLD within two years in elderly adults. METHODS: This study included and followed 3378 initial NAFLD-free subjects aged 60 years or over for 2 years, which were randomly divided into a training set and a validation set...
February 9, 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28168986/gastric-emptying-is-reduced-in-experimental-nec-and-correlates-with-the-severity-of-intestinal-damage
#18
Yuhki Koike, Bo Li, Carol Lee, Shigang Cheng, Hiromu Miyake, Christopher Welsh, Alison Hock, Jaques Belik, Augusto Zani, Agostino Pierro
PURPOSE: The aim of this study is to assess gastric emptying in experimental necrotizing enterocolitis (NEC) and its diagnostic significance using non-invasive ultrasound imaging. METHODS: Fourteen neonatal mice (C57BL/6) were randomized into two groups: NEC [n=10] and control [n=4]. NEC was induced by gavage feeding of hyperosmolar formula, hypoxia, and lipopolysaccharide between postnatal day 5 (P5) and 9 (P9). Stomach volume was measured using a 40-MHz ultrasound transducer on P5 and P9...
January 29, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28166493/a-gpu-accelerated-3d-coupled-sub-sample-estimation-algorithm-for-volumetric-breast-strain-elastography
#19
Bo Peng, Yuqi Wang, Timothy J Hall, Jingfeng Jiang
Our primary objective of this work was to extend a previously published 2D coupled sub-sample tracking algorithm for 3D speckle tracking in the framework of ultrasound breast strain elastography. In order to overcome heavy computational cost, we investigated the use of a graphic processing unit (GPU) to accelerate the 3D coupled sub-sample speckle tracking method. The performance of the proposed GPU implementation was tested using a tissue-mimicking (TM) phantom and in vivo breast ultrasound data. The performance of this 3D sub-sample tracking algorithm was compared with the conventional 3D quadratic subsample estimation algorithm...
January 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28166071/gallbladder-volume-in-sikkimese-population
#20
R Dey, B K Sharma, V K Singh, D K Jha
Background Gall bladder volume can have clinical and therapeutic implications and possibly affect certain pathophysiological mechanisms of many diseases affecting the gallbladder including gall stones. Objective The objective of the study was to establish baseline indices of gallbladder volume for the Sikkimese population and determine its correlation with age, sex and Body Mass Index. Method A prospective epidemiologic study on selected 100 patients (equal male to female ratio) over the age of 36 years, undergoing ultrasound scan of abdomen, was undertaken...
April 2016: Kathmandu University Medical Journal (KUMJ)
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