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https://www.readbyqxmd.com/read/28547868/improving-three-dimensional-mechanical-imaging-of-breast-lesions-with-principal-component-analysis
#1
Mohit Tyagi, Yuqi Wang, Timothy Hall, Paul E Barbone, Assad A Oberai
PURPOSE: Elastography has emerged as a new tool for detecting and diagnosing many types of diseases including breast cancer. To date, most clinical applications of elastography have utilized two-dimensional strain images. The goal of this paper is to present a new quasi-static elastography technique that yields shear modulus images in three dimensions METHODS: An automated breast volume scanner was used to acquire ultrasound images of the breast as it was gently compressed. Cross-correlation between successive images was used to determine the displacement within the tissue...
May 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28547846/multiline-balanced-ssfp-for-rapid-functional-imaging-at-ultrahigh-field
#2
Philipp Ehses, Klaus Scheffler
PURPOSE: The goal of this study is to develop and evaluate a multiline balanced steady-state free-precession (bSSFP) sequence for passband functional MRI at ultrahigh field. METHODS: Passband bSSFP functional MRI experiments using a visual task were performed on a 9.4 T system with echo trains ranging from one up to seven echoes. We analyze the acquisition efficiency, temporal and thermal signal-to-noise ratio, as well as the observed blood oxygen-level-dependent (BOLD) signal changes...
May 25, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28546910/plants-and-light-manipulation-the-integrated-mineral-system-in-okra-leaves
#3
Maria Pierantoni, Ron Tenne, Vlad Brumfeld, Vladimir Kiss, Dan Oron, Lia Addadi, Steve Weiner
Calcium oxalate and silica minerals are common components of a variety of plant leaves. These minerals are found at different locations within the leaf, and there is little conclusive evidence about the functions they perform. Here tools are used from the fields of biology, optics, and imaging to investigate the distributions of calcium oxalate, silica minerals, and chloroplasts in okra leaves, in relation to their functions. A correlative approach is developed to simultaneously visualize calcium oxalates, silica minerals, chloroplasts, and leaf soft tissue in 3D without affecting the minerals or the organic components...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28546876/self-monitoring-symptoms-in-glaucoma-a-feasibility-study-of-a-web-based-diary-tool
#4
Leanne McDonald, Fiona C Glen, Deanna J Taylor, David P Crabb
Purpose. Glaucoma patients annually spend only a few hours in an eye clinic but spend more than 5000 waking hours engaged in everything else. We propose that patients could self-monitor changes in visual symptoms providing valuable between clinic information; we test the hypothesis that this is feasible using a web-based diary tool. Methods. Ten glaucoma patients with a range of visual field loss took part in an eight-week pilot study. After completing a series of baseline tests, volunteers were prompted to monitor symptoms every three days and complete a diary about their vision during daily life using a bespoke web-based diary tool...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28545734/cup-to-disc-ratio-asymmetry-in-u-s-adults-prevalence-and-association-with-glaucoma-in-the-2005-2008-national-health-and-nutrition-examination%C3%A2-survey
#5
Mary Qiu, Michael V Boland, Pradeep Y Ramulu
PURPOSE: To describe the prevalence of vertical cup-to-disc ratio (vCDR) asymmetry in U.S. adults and assess the utility of vCDR asymmetry in the diagnosis of glaucoma. DESIGN: Cross-sectional study. PARTICIPANTS: A total of 5359 subjects aged ≥40 years from the 2005-2008 National Health and Nutrition Examination Survey (NHANES). METHODS: Subjects completed retinal photography and had vCDR determined in both eyes, with vCDR asymmetry calculated as the absolute value of the difference between the 2 eyes...
May 22, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28545611/knowledge-graph-for-tcm-health-preservation-design-construction-and-applications
#6
Tong Yu, Jinghua Li, Qi Yu, Ye Tian, Xiaofeng Shun, Lili Xu, Ling Zhu, Hongjie Gao
Traditional Chinese Medicine (TCM) is one of the important non-material cultural heritages of the Chinese nation. It is an important development strategy of Chinese medicine to collect, analyzes, and manages the knowledge assets of TCM health care. As a novel and massive knowledge management technology, knowledge graph provides an ideal technical means to solve the problem of "Knowledge Island" in the field of traditional Chinese medicine. In this study, we construct a large-scale knowledge graph, which integrates terms, documents, databases and other knowledge resources...
March 2017: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/28545121/measurement-of-macular-structure-function-relationships-using-spectral-domain-optical-coherence-tomography-sd-oct-and-pattern-electroretinograms-perg
#7
Keunheung Park, Jinmi Kim, Jiwoong Lee
BACKGROUND: Retinal ganglion cell (RGC) death is a common cause of loss of vision during glaucoma. Pattern electroretinogram (PERG) is an objective measure of the central retinal function that correlates with macular GCL thickness. The aim of this study is to determine possible relationships between the N95 amplitude of pattern electroretinogram (PERGamp) and macular ganglion cell/inner plexiform layer thickness (GCIPLT). METHODS AND FINDINGS: This was a retrospective and comparative study including 74 glaucoma patients (44 early stage and 30 advanced stage cases) and 66 normal control subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28544454/flexible-nanowire-cluster-as-a-wearable-colorimetric-humidity-sensor
#8
Zhiqiang Wei, Zhang-Kai Zhou, Qiuyu Li, Jiancai Xue, Andrea Di Falco, Zhongjian Yang, Jianhua Zhou, Xuehua Wang
Wearable plasmonic devices combine the advantages of high flexibility, ultrathinness, light weight, and excellent integration with the optical benefits mediated by plasmon-enhanced electric fields. However, two obstacles severely hinder further developments and applications of a wearable plasmonic device. One is the lack of efficient approach to obtaining devices with robust antimotion-interference property, i.e., the devices can work independently on the morphology changes of their working structures caused by arbitrary wearing conditions...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28543961/automated-low-contrast-pattern-recognition-algorithm-for-magnetic-resonance-image-quality-assessment
#9
Morgan Ehman, Zhonghao Bao, Scott A Stiving, Mallik Kasam, Dianna Lanners, Teresa Peterson, Renee Jonsgaard, Rickey Carter, Kiaran P McGee
PURPOSE: Low contrast (LC) detectability is a common test criterion for diagnostic radiologic quality control (QC) programs. Automation of this test is desirable in order to reduce human variability and to speed up analysis. However, automation is challenging due to the complexity of the human visual perception system and the ability to create algorithms that mimic this response. This paper describes the development and testing of an automated LC detection algorithm for use in the analysis of magnetic resonance (MR) images of the American College of Radiology (ACR) QC phantom...
May 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28543874/ex-vivo-magnetic-resonance-imaging-using-hyaluronic-acid-fillers-differences-between-monophasic-and-biphasic-fillers
#10
M J Kim, W-J Moon, M S Hur, S H Han, Y W Lee, Y B Choe, K J Ahn
BACKGROUND/PURPOSE: Hyaluronic acid (HA) is an anionic, non-sulfated glycosaminoglycan distributed throughout the human skin and injectable HA fillers are the most commonly used in aesthetic field. This study aimed to determine if differences in physical characteristics of HA products (monophasic or biphasic fillers) affect the patterns of magnetic resonance imaging (MRI). METHODS: Twenty biphasic fillers and nine monophasic fillers were obtained from a commercial source, and examined with a 3...
May 25, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/28543741/detection-of-progression-of-glaucomatous-retinal-nerve-fibre-layer-defects-using-optical-coherence-tomography-guided-progression-analysis
#11
Young Hoon Hwang, Min Kyung Kim, Jae Min Wi, Jae Keun Chung, Kwan Bok Lee
PURPOSE: The aim was to investigate the agreement for detection of progression of glaucomatous retinal nerve fibre layer defects (RNFLD) between optical coherence tomography-guided progression analysis (OCT GPA) and conventional red-free fundus photography. METHODS: Four hundred and fifteen glaucomatous eyes that underwent at least four serial red-free photographic and OCT examinations were included in the study. Based on the inspection of the red-free fundus photographs and GPA maps, RNFLD progression was defined as the development of a new defect, widening or deepening of a pre-existing RNFLD in red-free fundus photography (photographic progression) or 'Likely Loss' on a GPA map (GPA progression)...
May 24, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28542692/association-between-undetected-10-2-visual-field-damage-and-vision-related-quality-of-life-in-patients-with-glaucoma
#12
Dana M Blumberg, Carlos Gustavo De Moraes, Alisa J Prager, Qi Yu, Lama Al-Aswad, George A Cioffi, Jeffrey M Liebmann, Donald C Hood
Importance: Recent evidence supports the presence of macular damage (within 8° of the central field) to retinal ganglion cells and associated central visual field (VF) defects in glaucoma, even in early stages. Despite this, to our knowledge, the association of 10-2 VF damage with vision-related quality of life (QOL) has not been well studied. Objective: To determine the association between QOL and visual function as measured by 24-2 and 10-2 VFs in patients with primary open-angle glaucoma and to test the hypothesis that patients with vision-related QOL disproportionate to their 24-2 VF status may exhibit 10-2 damage overlooked by the 24-2 test...
May 25, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28542536/comparison-of-matrix-frequency-doubling-technology-perimetry-and-standard-automated-perimetry-in-monitoring-the-development-of-visual-field-defects-for-glaucoma-suspect-eyes
#13
Rongrong Hu, Chenkun Wang, Lyne Racette
BACKGROUND: Perimetry is indispensable for the clinical management of glaucoma suspects. Our goal is to compare the performance of standard automated perimetry (SAP) and Matrix frequency-doubling technology (FDT) perimetry in monitoring the development of visual field (VF) defects in glaucoma suspect eyes. METHODS: Longitudinal data of paired SAP and FDT from 221 eyes of 155 glaucoma suspects enrolled in the Diagnostic Innovations in Glaucoma Study or the African Descent and Glaucoma Evaluation Study were included...
2017: PloS One
https://www.readbyqxmd.com/read/28542372/revision-of-encapsulated-blebs-after-trabeculectomy-long-term-comparison-of-standard-bleb-needling-and-modified-needling-procedure-combined-with-transconjunctival-scleral-flap-sutures
#14
P Laspas, P D Culmann, F H Grus, V Prokosch-Willing, A Poplawksi, N Pfeiffer, E M Hoffmann
PURPOSE: To compare two surgical approaches for treating encapsulated blebs after trabeculectomy with mitomycin C, in terms of the development of intraocular pressure and progression of glaucoma in a long-term follow up: 1. bleb needling alone vs. 2. a combined approach of needling with additional transconjunctival scleral flap sutures, to prevent early ocular hypotony. METHODS: Forty-six patients with failing blebs after trabeculectomy with mitomycin C were enrolled in this study...
2017: PloS One
https://www.readbyqxmd.com/read/28542342/development-of-machine-learning-models-for-diagnosis-of-glaucoma
#15
Seong Jae Kim, Kyong Jin Cho, Sejong Oh
The study aimed to develop machine learning models that have strong prediction power and interpretability for diagnosis of glaucoma based on retinal nerve fiber layer (RNFL) thickness and visual field (VF). We collected various candidate features from the examination of retinal nerve fiber layer (RNFL) thickness and visual field (VF). We also developed synthesized features from original features. We then selected the best features proper for classification (diagnosis) through feature evaluation. We used 100 cases of data as a test dataset and 399 cases of data as a training and validation dataset...
2017: PloS One
https://www.readbyqxmd.com/read/28542230/visual-field-changes-after-vitrectomy-with-internal-limiting-membrane-peeling-for-epiretinal-membrane-or-macular-hole-in-glaucomatous-eyes
#16
Shunsuke Tsuchiya, Tomomi Higashide, Kazuhisa Sugiyama
PURPOSE: To investigate visual field changes after vitrectomy for macular diseases in glaucomatous eyes. METHODS: A retrospective review of 54 eyes from 54 patients with glaucoma, who underwent vitrectomy for epiretinal membrane (ERM; 42 eyes) or macular hole (MH; 12 eyes). Standard automated perimetry (Humphrey visual field 24-2 program) was performed and analyzed preoperatively and twice postoperatively (1st and 2nd sessions; 4.7 ± 2.5, 10.3 ± 3.7 months after surgery, respectively)...
2017: PloS One
https://www.readbyqxmd.com/read/28541267/choroidal-melanoma-sector-melanocytosis-and-retinal-pigment-epithelial-microdetachments-in-birt-hogg-dub%C3%A3-syndrome
#17
Charlotte L Marous, Molly R Marous, R Joel Welch, Jerry A Shields, Carol L Shields
PURPOSE: Birt-Hogg-Dubé Syndrome (BHDS) is a rare autosomal dominant condition that can predispose patients to numerous cutaneous fibrofolliculomas and other cutaneous lesions, pulmonary cysts with spontaneous pneumothorax, and multifocal renal tumors and cancer. The genetic mutations responsible for BHDS are related to tumor suppression and the mammalian target of rapamycin (mTOR) pathway. Previous reports of the ocular findings in BHDS include eyelid fibrofolliculomas, "flecked chorioretinopathy," and one report of choroidal melanoma...
May 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28541266/retinochoroidal-anastomosis-associated-with-enhanced-s-cone-syndrome
#18
Jennyfer Zerbib, Rocio Blanco Garavito, Sylvie Gerber, Hassiba Oubraham, Anne Sikorav, Isabelle Audo, Josseline Kaplan, Jean-Michel Rozet, Eric H Souied
PURPOSE: To describe the phenotype and genotype of a 10-year-old boy affected with enhanced S-cone syndrome associated with neovascularization. METHODS: Fundus autofluorescence, fluorescein angiography, indocyanine green angiography, spectral domain optical coherence tomography, full-field electroretinogram and NR2E3 molecular testing were performed. RESULTS: Best-corrected visual acuity was measured as 20/32, right eye and 20/20, left eye...
May 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28540367/lived-lives-a-pavee-perspective-an-arts-science-community-intervention-around-suicide-in-an-indigenous-ethnic-minority
#19
Kevin M Malone, Seamus G McGuinness, Eimear Cleary, Janis Jefferies, Christabel Owens, Cecily C Kelleher
Background: Suicide is a significant public health concern, which impacts on health outcomes. Few suicide research studies have been interdisciplinary. We combined a psychobiographical autopsy with a visual arts autopsy, in which families donated stories, images and objects associated with the lived life of a loved one lost to suicide. From this interdisciplinary research platform, a mediated exhibition was created (Lived Lives) with artist, scientist and families, co-curated by communities, facilitating dialogue, response and public action around suicide prevention...
April 13, 2017: Wellcome Open Research
https://www.readbyqxmd.com/read/28539115/quad-phased-data-mining-modeling-for-dementia-diagnosis
#20
Sunjoo Bang, Sangjoon Son, Hyunwoong Roh, Jihye Lee, Sungyun Bae, Kyungwon Lee, Changhyung Hong, Hyunjung Shin
BACKGROUND: The number of people with dementia is increasing along with people's ageing trend worldwide. Therefore, there are various researches to improve a dementia diagnosis process in the field of computer-aided diagnosis (CAD) technology. The most significant issue is that the evaluation processes by physician which is based on medical information for patients and questionnaire from their guardians are time consuming, subjective and prone to error. This problem can be solved by an overall data mining modeling, which subsidizes an intuitive decision of clinicians...
May 18, 2017: BMC Medical Informatics and Decision Making
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