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https://www.readbyqxmd.com/read/29348137/accuracy-of-the-compressed-sensing-accelerated-3d-flair-sequence-for-the-detection-of-ms-plaques-at-3t
#1
S Toledano-Massiah, A Sayadi, R de Boer, J Gelderblom, R Mahdjoub, S Gerber, M Zuber, M Zins, J Hodel
BACKGROUND AND PURPOSE: The use of 3D FLAIR improves the detection of brain lesions in MS patients, but requires long acquisition times. Compressed sensing reduces acquisition time by using the sparsity of MR images to randomly undersample the k-space. Our aim was to compare the image quality and diagnostic performance of 3D-FLAIR with and without compressed sensing for the detection of multiple sclerosis lesions at 3T. MATERIALS AND METHODS: Twenty-three patients with relapsing-remitting MS underwent both conventional 3D-FLAIR and compressed sensing 3D-FLAIR on a 3T scanner (reduction in scan time 1 minute 25 seconds, 27%; compressed sensing factor of 1...
January 18, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29347567/kinetics-of-biochemical-sensing-by-single-cells-and-populations-of-cells
#2
David B Saakian
We investigate the collective stationary sensing using N communicative cells, which involves surface receptors, diffusive signaling molecules, and cell-cell communication messengers. We restrict the scenarios to the signal-to-noise ratios (SNRs) for both strong communication and extrinsic noise only. We modified a previous model [Bialek and Setayeshgar, Proc. Natl. Acad. Sci. USA 102, 10040 (2005)PNASA60027-842410.1073/pnas.0504321102] to eliminate the singularities in the fluctuation correlations by considering a uniform receptor distribution over the surface of each cell with a finite radius a...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29343026/-applied-research-of-quadri-low-combined-with-automatic-tube-current-modulation-and-iterative-model-reconstruction-technology-in-head-and-neck-ct-angiography
#3
W Cai, C H Hu, X M Wang, S Hu, J Bao, J P Gong, G H Fan, W Zhang, D Shi, M H Qian
Objective: To investigate the feasibility of low tube voltage, low contrast medium concentration, injection rate and volume (quadri-low) combined with automatic tube current modulation (ATCM) and iterative model reconstruction (IMR) technology in head and neck CT angiography (CTA). Methods: A total of 70 patients whose body mass index (BMI)<25 kg/m(2) underwent head and neck CTA and digital subtraction angiography (DSA) from January to July 2017 were enrolled in this prospective study. According to random number table, patients were divided into two groups: group A (n=35) was scanned according to the protocol of 120 kV, 150 mAs, 50 ml and 5 ml/s iopromide (370 mg/ml) and filtered back projection (FBP) reconstruction; group B (n=35) was scanned with 80 kV, ATCM with mean tube current of 100 mAs, 30 ml and 3 ml/s iohexol (300 mg/ml) and IMR; the other parameters kept consistent between the two groups...
January 2, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29340936/application-of-color-transformation-techniques-in-pediatric-spinal-cord-mr-images-typically-developing-and-spinal-cord-injury-population
#4
Mahdi Alizadeh, Pallav Shah, Chris J Conklin, Devon M Middleton, Sona Saksena, Adam E Flanders, Laura Krisa, M J Mulcahey, Scott H Faro, Feroze B Mohamed
The purpose of this study was to evaluate an improved and reliable visualization method for pediatric spinal cord MR images in healthy subjects and patients with spinal cord injury (SCI). A total of 15 pediatric volunteers (10 healthy subjects and 5 subjects with cervical SCI) with a mean age of 11.41 years (range 8-16 years) were recruited and scanned using a 3.0T Siemens Verio MR scanner. T2-weighted axial images were acquired covering entire cervical spinal cord level C1 to C7. These gray-scale images were then converted to color images by using five different techniques including hue-saturation-value (HSV), rainbow, red-green-blue (RGB), and two enhanced RGB techniques using automated contrast stretching and intensity inhomogeneity correction...
January 16, 2018: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/29339139/improved-coronary-magnetic-resonance-angiography-using-gadobenate-dimeglumine-in-pediatric-congenital-heart-disease
#5
Miguel Silva Vieira, Markus Henningsson, Nathalie Dedieu, Vassilios S Vassiliou, Aaron Bell, Sujeev Mathur, Kuberan Pushparajah, Carlos Alberto Figueroa, Tarique Hussain, René Botnar, Gerald F Greil
BACKGROUND: CMRA in pediatrics remains challenging due to the smaller vessel size, high heart rates (HR), potential image degradation caused by limited patient cooperation and long acquisition times. High-relaxivity contrast agents have been shown to improve coronary imaging in adults, but limited data is available in children. We sought to investigate whether gadobenate dimeglumine (Gd-BOPTA) together with self-navigated inversion-prepared coronary magnetic resonance angiography (CMRA) sequence design improves coronary image quality in pediatric patients...
January 12, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29338826/application-of-the-dual-layer-spectral-detector-ct-in-the-ct-angiography-of-superior-vena-cava
#6
Guo Rong Wang, Zhi Wei Wang, Yi Ning Wang, Zheng Yu Jin
Objective To evaluate the application of the dual-layer spectral detector CT in the CT angiography of superior vena cava (SVC). Methods Totally 30 consecutive patients who underwent chest enhanced CT in our center were enrolled in this study. Eight series of images were reconstructed,including the conventional images at 120 kVp and seven series of virtual monoenergetic spectral images at 40,50,60,70,80,90,and 100 keV. The regions of interest (ROIs) were placed at the level of the proximal end,middle part,and distal end in the SVC vessel...
December 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/29336132/auditory-system-synchronization-and-cochlear-function-in-patients-with-normal-hearing-with-tinnitus-comparison-of-multiple-feature-with-longer-duration-and-single-feature-with-shorter-duration-tinnitus
#7
Sujoy Kumar Makar, Geetha Mukundan, Geeta Gore
OBJECTIVE: To observe cochlear and brainstem function in normal hearing ears with tinnitus using DPOAE and ABR audiometry. DESIGN: Case-control study. SAMPLE SIZE: Included 60 normal hearing male patients with age less than 45 years; control group consisted of 30 patients without tinnitus and the study group consisted of those with unilateral tinnitus of at least 6 month duration. Pure tone audiometry, tinnitus matching (pitch & loudness), DPOAE (SNR & Amplitude) and ABR results of absolute latency of wave I, III and V, with IPL difference of I-III, III-V & I-V, and ILD-V were investigated...
December 1, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/29332200/simultaneous-multi-slice-accelerated-turbo-spin-echo-of-the-knee-in-pediatric-patients
#8
Sebastien Benali, Patrick R Johnston, Ali Gholipour, Monet E Dugan, Keith Heberlein, Himanshu Bhat, Sarah D Bixby
PURPOSE: To compare knee MRI performed with the integrated parallel acquisition technique (PAT) and simultaneous multislice (SMS) turbo spin echo (TSE) T2-weighted (T2w) sequences with conventional TSE sequences in pediatric patients. MATERIALS AND METHODS: This was a retrospective IRB-approved study. Seventy-four subjects (26 male, 48 female, mean age 15.3 years, range 8-20) underwent 3-T MRI of the knee with a T2w TSE pulse sequence prototype with four-fold PAT and SMS acceleration as well as the standard PAT-only accelerated sequences...
January 13, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29328313/achievable-information-rate-enhancement-of-visible-light-communication-using-probabilistically-shaped-ofdm-modulation
#9
Chenhui Xie, Zexin Chen, Songnian Fu, Wu Liu, Zhixue He, Lei Deng, Ming Tang, Deming Liu
We present the first experimental demonstration of orthogonal frequency division multiplexed (OFDM) modulation using the probabilistic shaping (PS) technique in visible light communication (VLC) systems, in order to increase the achievable information rate (AIR) according to the pre-estimated signal to noise ratio (SNR) of VLC channel. We numerically investigate the performance of PS technique and make a fair comparison with bit-loading technique under different scenarios. By using a phosphor-LED based VLC system with available bandwidth of ~45-MHz, OFDM with PS technique can experimentally realize an AIR of 204...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29316819/hearing-aid-noise-suppression-and-working-memory-function
#10
Tobias Neher, Kirsten C Wagener, Rosa-Linde Fischer
OBJECTIVE: Research findings concerning the relation between benefit from hearing aid (HA) noise suppression and working memory function are inconsistent. The current study thus investigated the effects of three noise suppression algorithms on auditory working memory and the relation with reading span. DESIGN: Using a computer simulation of bilaterally fitted HAs, four settings were tested: (1) unprocessed, (2) directional microphones, (3) single-channel noise reduction, and (4) binaural coherence-based noise reduction...
January 9, 2018: International Journal of Audiology
https://www.readbyqxmd.com/read/29316720/on-the-performance-evaluation-of-a-mimo-wcdma-transmission-architecture-for-building-management-systems
#11
Eleftherios Tsampasis, Panagiotis K Gkonis, Panagiotis Trakadas, Theodοre Zahariadis
The goal of this study was to investigate the performance of a realistic wireless sensor nodes deployment in order to support modern building management systems (BMSs). A three-floor building orientation is taken into account, where each node is equipped with a multi-antenna system while a central base station (BS) collects and processes all received information. The BS is also equipped with multiple antennas; hence, a multiple input-multiple output (MIMO) system is formulated. Due to the multiple reflections during transmission in the inner of the building, a wideband code division multiple access (WCDMA) physical layer protocol has been considered, which has already been adopted for third-generation (3G) mobile networks...
January 8, 2018: Sensors
https://www.readbyqxmd.com/read/29315915/a-comparison-of-2-hydroxyglutarate-detection-at-3-and-7%C3%A2-t-with-long-te-semi-laser
#12
Adam Berrington, Natalie L Voets, Sarah J Larkin, Nick de Pennington, James Mccullagh, Richard Stacey, Christopher J Schofield, Peter Jezzard, Stuart Clare, Tom Cadoux-Hudson, Puneet Plaha, Olaf Ansorge, Uzay E Emir
Abnormally high levels of the 'oncometabolite' 2-hydroxyglutarate (2-HG) occur in many grade II and III gliomas, and correlate with mutations in the genes of isocitrate dehydrogenase (IDH) isoforms. In vivo measurement of 2-HG in patients, using magnetic resonance spectroscopy (MRS), has largely been carried out at 3 T, yet signal overlap continues to pose a challenge for 2-HG detection. To combat this, several groups have proposed MRS methods at ultra-high field (≥7 T) where theoretical increases in signal-to-noise ratio and spectral resolution could improve 2-HG detection...
January 5, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29315780/high-resolution-hyperpolarized-13-c-mrsi-using-spice-at-9-4t
#13
Hansol Lee, Jae Eun Song, Jaewook Shin, Eunhae Joe, Chan Gyu Joo, Young-Suk Choi, Ho-Taek Song, Dong-Hyun Kim
PURPOSE: To test the feasibility of using the SPICE (SPectroscopic Imaging by exploiting spatiospectral CorrElation) technique, which uses the partial separability of spectroscopic data, for high resolution hyperpolarized (HP) 13 C spectroscopic imaging. METHODS: Numerical simulations were performed to investigate the impact of transient HP signals on SPICE reconstruction. Furthermore, spectroscopic imaging exams from SPICE and conventional EPSI (echo-planar spectroscopic imaging) were simulated for comparison...
January 8, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29310329/impact-of-iterative-reconstruction-vs-filtered-back-projection-on-image-quality-in-320-slice-ct-coronary-angiography-insights-from-the-core320-multicenter-study
#14
Ahmed Fareed, Andrea L Vavere, Elke Zimmermann, Yutaka Tanami, Chloe Steveson, Matthew Matheson, Narinder Paul, Melvin Clouse, Christopher Cox, João A C Lima, Armin Arbab-Zadeh
Iterative reconstruction has been shown to reduce image noise compared with traditional filtered back projection with quantum denoising software (FBP/QDS+) in CT imaging but few comparisons have been made in the same patients without the influence of interindividual factors. The objective of this study was to investigate the impact of adaptive iterative dose reduction in 3-dimensional (AIDR 3D) and FBP/QDS+-based image reconstruction on image quality in the same patients.We randomly selected 100 patients enrolled in the coronary evaluation using 320-slice CT study who underwent CT coronary angiography using prospectively electrocardiogram triggered image acquisition with a 320-detector scanner...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29305164/recent-progress-in-asl
#15
REVIEW
Luis Hernandez-Garcia, Anish Lahiri, Jonas Schollenberger
This article aims to provide the reader with an overview of recent developments in Arterial Spin Labeling (ASL) MRI techniques. A great deal of progress has been made in recent years in terms of the SNR and acquisition speed. New strategies have been introduced to improve labeling efficiency, reduce artefacts, and estimate other relevant physiological parameters besides perfusion. As a result, ASL techniques has become a reliable workhorse for researchers as well as clinicians. After a brief overview of the technique's fundamentals, this article will review new trends and variants in ASL including vascular territory mapping and velocity selective ASL, as well as arterial blood volume imaging techniques...
January 2, 2018: NeuroImage
https://www.readbyqxmd.com/read/29303359/bayesian-penalised-likelihood-reconstruction-q-clear-of-18f-fluciclovine-pet-for-imaging-of-recurrent-prostate-cancer-semi-quantitative-and-clinical-evaluation
#16
Eugene J Teoh, Daniel R McGowan, David M Schuster, Maria Tsakok, Fergus V Gleeson, Kevin M Bradley
OBJECTIVE: 18F-Fluciclovine (FACBC) is an amino acid PET radiotracer approved for recurrent prostate cancer imaging. We investigate the use of Bayesian penalised likelihood (BPL) reconstruction for 18F-fluciclovine PET. METHODS: Fifteen 18F-fluciclovine scans were reconstructed using OSEM, OSEM+point spread function modeling (PSF) and BPL using β values 100-600. Lesion SUVmax, organ SUVmean and standard deviation were measured. De-identified reconstructions (OSEM, PSF, BPL using β200-600) from 10 cases were visually analysed by two readers who indicated their most and least preferred reconstructions, and scored overall image quality (IQ), noise level, background marrow IQ and lesion conspicuity...
January 5, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29296487/improved-contrast-in-inverted-selective-plane-illumination-microscopy-of-thick-tissues-using-confocal-detection-and-structured-illumination
#17
Bihe Hu, Daniel Bolus, J Quincy Brown
Inverted selective plane illumination microscopy (iSPIM) enables fast, large field-of-view, long term imaging with compatibility with conventional sample mounting. However, the imaging quality can be deteriorated in thick tissues due to sample scattering. Three strategies have been adopted in this paper to optimize the imaging performance of iSPIM on thick tissue imaging: electronic confocal slit detection (eCSD), structured illumination (SI) and the two combined. We compared the image contrast when using SPIM, confocal SPIM (using eCSD alone), SI SPIM (using SI alone) or confocal-SI SPIM (combining both methods) on images of gelatin phantom and highly-scattering fluorescently-stained human tissue...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29295594/motion-artifact-quantification-and-sensor-fusion-for-unobtrusive-health-monitoring
#18
Christoph Hoog Antink, Florian Schulz, Steffen Leonhardt, Marian Walter
Sensors integrated into objects of everyday life potentially allow unobtrusive health monitoring at home. However, since the coupling of sensors and subject is not as well-defined as compared to a clinical setting, the signal quality is much more variable and can be disturbed significantly by motion artifacts. One way of tackling this challenge is the combined evaluation of multiple channels via sensor fusion. For robust and accurate sensor fusion, analyzing the influence of motion on different modalities is crucial...
December 25, 2017: Sensors
https://www.readbyqxmd.com/read/29295492/on-the-impact-of-anomalous-noise-events-on-road-traffic-noise-mapping-in-urban-and-suburban-environments
#19
Ferran Orga, Francesc Alías, Rosa Ma Alsina-Pagès
Noise pollution is a critical factor affecting public health, the relationship between road traffic noise (RTN) and several diseases in urban areas being especially disturbing. The Environmental Noise Directive 2002/49/EC and the CNOSSOS-EU framework are the main instruments of the European Union to identify and combat noise pollution, requiring Member States to compose and publish noise maps and noise management action plans every five years. Nowadays, the noise maps are starting to be tailored by means of Wireless Acoustic Sensor Networks (WASN)...
December 23, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29284494/ferumoxytol-enhanced-black-blood-cardiovascular-magnetic-resonance-imaging
#20
Kim-Lien Nguyen, Eun-Ah Park, Takegawa Yoshida, Peng Hu, J Paul Finn
BACKGROUND: Bright-blood and black-blood cardiovascular magnetic resonance (CMR) techniques are frequently employed together during a clinical exam because of their complementary features. While valuable, existing black-blood CMR approaches are flow dependent and prone to failure. We aim to assess the effectiveness and reliability of ferumoxytol enhanced (FE) Half-Fourier Single-shot Turbo Spin-echo (HASTE) imaging without magnetization preparation pulses to yield uniform intra-luminal blood signal suppression by comparing FE-HASTE with pre-ferumoxytol HASTE imaging...
December 28, 2017: Journal of Cardiovascular Magnetic Resonance
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