keyword
MENU ▼
Read by QxMD icon Read
search

Computation

keyword
https://www.readbyqxmd.com/read/28434193/mediators-of-socioeconomic-differences-in-adiposity-among-youth-a-systematic-review
#1
REVIEW
M K Gebremariam, N Lien, R A Nianogo, O A Arah
BACKGROUND: Youth with a low socioeconomic position in developed countries are at a disproportionately higher risk of being overweight or obese than their counterparts. Tackling these inequalities requires that the mechanisms behind them are well understood. OBJECTIVES: The aim of this review was to summarize existing evidence regarding the factors that mediate or contribute to the explanation of the relationship between socioeconomic position and adiposity among youth...
April 23, 2017: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28434125/kidney-morphological-parameters-measured-using-noncontrast-enhanced-steady-state-free-precession-mri-with-spatially-selective-inversion-recovery-pulse-correlate-with-egfr-in-patients-with-advanced-ckd
#2
Tadashi Otsuka, Yoshikatsu Kaneko, Yuya Sato, Ryohei Kaseda, Ryuji Aoyagi, Suguru Yamamoto, Shin Goto, Ichiei Narita
BACKGROUND: It is well known that atrophic renal changes are associated with chronic kidney disease (CKD) progression, but conventional diagnostic imaging methods such as noncontrast-enhanced computed tomography and magnetic resonance imaging (MRI) have been insufficient for precisely assessing kidney function because they cannot clearly distinguish between the medulla and cortex. Hence, here we used noncontrast-enhanced steady-state free precession (SSFP) MRI with a spatially selective inversion recovery (IR) pulse to improve visibility for renal corticomedullary differentiation and evaluated the association between morphological parameters and kidney function in patients with CKD...
April 22, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/28434064/the-utility-of-ct-and-mri-in-detecting-male-urethral-recurrence-after-radical-cystectomy
#3
Jung Jae Park, Byung Kwan Park
PURPOSE: To evaluate the utility of computed tomography (CT) and magnetic resonance imaging (MRI) in detecting male urethral recurrence (UR). MATERIALS AND METHODS: Between December 2008 and March 2016, 12 men (age range 61-85 years; median, 74 years) with urethral bloody discharge or pain were histologically confirmed as UR after radical cystectomy due to urothelial carcinoma. Of these patients, eight underwent both CT and MRI. The remaining four patients underwent CT only...
April 22, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28434062/nlophoric-3-6-di-substituted-quinoxalin-carbazoles-synthesis-photophysical-properties-and-dft-studies
#4
Rahul D Telore, Amol G Jadhav, Nagaiyan Sekar
Synthesis of novel 3,6-di(substituted quinoxalin) carbazole fluorophores by the condensation of 1,1'-(9-ethyl-9H-carbazole-3,6-diyl)bis(2-bromoethanone) with methyl, chloro and unsubstituted o-phenylenediamine is presented. Synthesized derivatives are well characterized by (1)H NMR, (13)C NMR, FTIR and Mass spectroscopy. Photophysical studies are carried out using solvents of varying polarities revealed positive solvatochromism and intramolecular charge transfer from carbazole (Donor) to quinoxalin (Acceptor)...
April 22, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28434024/chaotic-dynamics-in-the-seasonally-forced-sir-epidemic-model
#5
Pablo G Barrientos, J Ángel Rodríguez, Alfonso Ruiz-Herrera
We prove analytically the existence of chaotic dynamics in the forced SIR model. Although numerical experiments have already suggested that this model can exhibit chaotic dynamics, a rigorous proof (without computer-aided) was not given before. Under seasonality in the transmission rate, the coexistence of low birth and mortality rates with high recovery and transmission rates produces infinitely many periodic and aperiodic patterns together with sensitive dependence on the initial conditions.
April 22, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28433871/automatic-cumulative-sums-contour-detection-of-fbp-reconstructed-multi-object-nuclear-medicine-images
#6
Nicholas E Protonotarios, George M Spyrou, George A Kastis
The problem of determining the contours of objects in nuclear medicine images has been studied extensively in the past, however most of the analysis has focused on a single object as opposed to multiple objects. The aim of this work is to develop an automated method for determining the contour of multiple objects in positron emission tomography (PET) and single photon emission computed tomography (SPECT) filtered backprojection (FBP) reconstructed images. These contours can be used for computing body edges for attenuation correction in PET and SPECT, as well as for eliminating streak artifacts outside the objects, which could be useful in compressive sensing reconstruction...
April 14, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28433870/automated-detection-of-premature-delivery-using-empirical-mode-and-wavelet-packet-decomposition-techniques-with-uterine-electromyogram-signals
#7
U Rajendra Acharya, Vidya K Sudarshan, Soon Qing Rong, Zechariah Tan, Choo Min Lim, Joel Ew Koh, Sujatha Nayak, Sulatha V Bhandary
An accurate detection of preterm labor and the risk of preterm delivery before 37 weeks of gestational age is crucial to increase the chance of survival rate for both mother and the infant. Thus, the uterine contractions measured using uterine electromyogram (EMG) or electro hysterogram (EHG) need to have high sensitivity in the detection of true preterm labor signs. However, visual observation and manual interpretation of EHG signals at the time of emergency situation may lead to errors. Therefore, the employment of computer-based approaches can assist in fast and accurate detection during the emergency situation...
April 18, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28433825/a-distributed-framework-for-health-information-exchange-using-smartphone-technologies
#8
Mohamed Abdulnabi, Ahmed Al-Haiqi, Mlm Kiah, A A Zaidan, B B Zaidan, Muzammil Hussein
Nationwide health information exchange (NHIE) continues to be a persistent concern for government agencies, despite the many efforts and the conceived benefits of sharing patient data among healthcare providers. Difficulties in ensuring global connectivity, interoperability, and concerns on security have always hampered the government from successfully deploying NHIE. By looking at NHIE from a fresh perspective and bearing in mind the pervasiveness and power of modern mobile platforms, this paper proposes a new approach to NHIE that builds on the notion of consumer-mediated HIE, albeit without the focus on central health record banks...
April 19, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28433822/programming-experience-promotes-higher-stem-motivation-among-first-grade-girls
#9
Allison Master, Sapna Cheryan, Adriana Moscatelli, Andrew N Meltzoff
The gender gap in science, technology, engineering, and math (STEM) engagement is large and persistent. This gap is significantly larger in technological fields such as computer science and engineering than in math and science. Gender gaps begin early; young girls report less interest and self-efficacy in technology compared with boys in elementary school. In the current study (N=96), we assessed 6-year-old children's stereotypes about STEM fields and tested an intervention to develop girls' STEM motivation despite these stereotypes...
April 20, 2017: Journal of Experimental Child Psychology
https://www.readbyqxmd.com/read/28433792/a-pilot-study-examining-a-computer-based-intervention-to-improve-recognition-and-understanding-of-emotions-in-young-children-with-communication-and-social-deficits
#10
Neri L Romero
BACKGROUND: A common social impairment in individuals with ASD is difficulty interpreting and or predicting emotions of others. To date, several interventions targeting teaching emotion recognition and understanding have been utilized both by researchers and practitioners. The results suggest that teaching emotion recognition is possible, but that the results do not generalize to non-instructional contexts. This study sought to replicate earlier findings of a positive impact of teaching emotion recognition using a computer-based intervention and to extend it by testing for generalization on live models in the classroom setting...
April 20, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28433753/computational-image-analysis-for-prognosis-determination-in-dme
#11
Bianca S Gerendas, Hrvoje Bogunovic, Amir Sadeghipour, Thomas Schlegl, Georg Langs, Sebastian M Waldstein, Ursula Schmidt-Erfurth
In this pilot study, we evaluated the potential of computational image analysis of optical coherence tomography (OCT) data to determine the prognosis of patients with diabetic macular edema (DME). Spectral-domain OCT scans with fully automated retinal layer segmentation and segmentation of intraretinal cystoid fluid (IRC) and subretinal fluid of 629 patients receiving anti-vascular endothelial growth factor therapy for DME in a randomized prospective clinical trial were analyzed. The results were used to define 312 potentially predictive features at three timepoints (baseline, weeks 12 and 24) for best-corrected visual acuity (BCVA) at baseline and after one year used in a random forest prediction path...
April 19, 2017: Vision Research
https://www.readbyqxmd.com/read/28433736/on-the-role-of-the-second-order-derivative-term-in-the-calculation-of-convergent-beam-diffraction-patterns
#12
S C Hillier, E T Robertson, G D Reid, R D Haynes, M D Robertson
The simulation of (scanning) transmission electron microscopy images and diffraction patterns is most often performed using the forward-scattering approximation where the second-order derivative term in z is assumed to be small with respect to the first-order derivative term in the modified Schrödinger equation. This assumption is very good at high incident electron energies, but breaks down at low energies. In order to study the differences between first- and second-order methods, convergent beam electron diffraction patterns were simulated for silicon at the [111] zone-axis orientation at 20 keV and compared using electron intensity difference maps and integrated intensity profiles...
April 12, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28433606/in-silico-methods-for-co-transcriptional-rna-secondary-structure-prediction-and-for-investigating-alternative-rna-structure-expression
#13
REVIEW
Irmtraud M Meyer
RNA transcripts are the primary products of active genes in any living organism, including many viruses. Their cellular destiny not only depends on primary sequence signals, but can also be determined by RNA structure. Recent experimental evidence shows that many transcripts can be assigned more than a single functional RNA structure throughout their cellular life and that structure formation happens co-transcriptionally, i.e. as the transcript is synthesised in the cell. Moreover, functional RNA structures are not limited to non-coding transcripts, but can also feature in coding transcripts...
April 19, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28433601/volumetric-versus-unidimensional-measures-of-metastatic-colorectal-cancer-in-assessing-disease-response
#14
Meghan G Lubner, Nicholas Stabo, Sam J Lubner, Alejandro Munoz Del Rio, Chihwa Song, Perry J Pickhardt
INTRODUCTION: The purpose of this study was to compare unidimensional (1D/linear) and volumetric (3D) measures of metastatic colorectal cancer (mCRC) at computed tomography (CT) for predicting clinical outcome. PATIENTS AND METHODS: Analysis of CT images in 105 patients (mean age, 59 years; range, 25-81 years; 45 women, 60 men) receiving treatment for mCRC was performed. Both unidimensional and volumetric measures were obtained on index lesions at 3 time points (baseline/midpoint/post-therapy; mean interval, 4...
March 27, 2017: Clinical Colorectal Cancer
https://www.readbyqxmd.com/read/28433503/mr-fingerprinting-reconstruction-with-kalman-filter
#15
Xiaodi Zhang, Zechen Zhou, Shiyang Chen, Shuo Chen, Rui Li, Xiaoping Hu
Magnetic resonance fingerprinting (MR fingerprinting or MRF) is a newly introduced quantitative magnetic resonance imaging technique, which enables simultaneous multi-parameter mapping in a single acquisition with improved time efficiency. The current MRF reconstruction method is based on dictionary matching, which may be limited by the discrete and finite nature of the dictionary and the computational cost associated with dictionary construction, storage and matching. In this paper, we describe a reconstruction method based on Kalman filter for MRF, which avoids the use of dictionary to obtain continuous MR parameter measurements...
April 19, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28433483/functional-image-guided-stereotactic-body-radiation-therapy-planning-for-patients-with-hepatocellular-carcinoma
#16
Uranchimeg Tsegmed, Tomoki Kimura, Takeo Nakashima, Yuko Nakamura, Toru Higaki, Nobuki Imano, Yoshiko Doi, Masahiro Kenjo, Shuichi Ozawa, Yuji Murakami, Kazuo Awai, Yasushi Nagata
The aim of the current planning study is to evaluate the ability of gadoxetate disodium-enhanced magnetic resonance imaging (EOB-MRI)-guided stereotactic body radiation therapy (SBRT) planning by using intensity-modulated radiation therapy (IMRT) techniques in sparing the functional liver tissues during SBRT for hepatocellular carcinoma. In this study, 20 patients with hepatocellular carcinoma were enrolled. Functional liver tissues were defined according to quantitative liver-spleen contrast ratios ≥ 1...
April 19, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28433482/variations-of-target-volume-definition-and-daily-target-volume-localization-in-stereotactic-body-radiotherapy-for-early-stage-non-small-cell-lung-cancer-patients-under-abdominal-compression
#17
Chunhui Han, Sagus Sampath, Timothy E Schultheisss, Jeffrey Y C Wong
We aimed to compare gross tumor volumes (GTV) in 3-dimensional computed tomography (3DCT) simulation and daily cone beam CT (CBCT) with the internal target volume (ITV) in 4-dimensional CT (4DCT) simulation in stereotactic body radiotherapy (SBRT) treatment of patients with early-stage non-small cell lung cancer (NSCLC) under abdominal compression. We retrospectively selected 10 patients with NSCLC who received image-guided SBRT treatments under abdominal compression with daily CBCT imaging. GTVs were contoured as visible gross tumor on the planning 3DCT and daily CBCT, and ITVs were contoured using maximum intensity projection (MIP) images of the planning 4DCT...
April 19, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28433473/sex-difference-in-the-heat-shock-response-to-high-external-load-resistance-training-in-older-humans
#18
Rose Njemini, Louis Nuvagah Forti, Tony Mets, Evelien Van Roie, Walter Coudyzer, Ingo Beyer, Christophe Delecluse, Ivan Bautmans
BACKGROUND: Literature reports on the effects of resistance training on heat shock protein70 (Hsp70) adaptation in older subjects are scarce. Moreover, the optimum training load required to obtain a beneficial adaptation profile is lacking. Therefore, the aim of this study was to determine the effects of resistance training at various external loads on extracellular Hsp70 (eHsp70) resting levels in older humans. METHODS: Fifty-six community-dwelling older (68±5years) volunteers were randomized to 12weeks of resistance training (3×/week) at either high-resistance (HIGH, 8 males, 10 females, 2×10-15 repetitions at 80%1RM), low resistance (LOW, 9 Males, 10 Females, 1×80-100 repetitions at 20%1RM), or mixed low resistance (LOW+, 9 Males, 10 Females, 1×60 repetitions at 20%1RM followed by 1×10-20 repetitions at 40%1RM)...
April 19, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28433399/simultaneous-68-ga-dotatate-positron-emission-tomography-magnetic-resonance-imaging-in-meningioma-target-contouring-feasibility-and-impact-upon-interobserver-variability-versus-positron-emission-tomography-computed-tomography-and-computed-tomography-magnetic
#19
J Maclean, N Fersht, K Sullivan, I Kayani, J Bomanji, J Dickson, C O'Meara, S Short
AIMS: The increasing use of highly conformal radiation techniques to treat meningioma confers a greater need for accurate targeting. Several groups have shown that positron emission tomography/computed tomography (PET/CT) information alters meningioma targets contoured by single observers, but whether this translates into improved accuracy has not been defined. As magnetic resonance imaging (MRI) is the cornerstone of meningioma target contouring, simultaneous PET/MRI may be superior to PET/CT...
April 19, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28433390/a-computational-study-of-invariant-i5-in-a-nearly-incompressible-transversely-isotropic-model-for-white-matter
#20
Yuan Feng, Suhao Qiu, Xiaolong Xia, Songbai Ji, Chung-Hao Lee
The aligned axonal fiber bundles in white matter make it suitable to be modeled as a transversely isotropic material. Recent experimental studies have shown that a minimal form, nearly incompressible transversely isotropic (MITI) material model, is capable of describing mechanical anisotropy of white matter. Here, we used a finite element (FE) computational approach to demonstrate the significance of the fifth invariant (I5) when modeling the anisotropic behavior of white matter in the large-strain regime. We first implemented and validated the MITI model in an FE simulation framework for large deformations...
April 9, 2017: Journal of Biomechanics
keyword
keyword
14338
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"