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Echo intensity

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https://www.readbyqxmd.com/read/28533003/rectus-femoris-echo-intensity-correlates-with-muscle-strength-but-not-endurance-in-younger-and-older-men
#1
Jacob A Mota, Matt S Stock
We examined correlations between echo intensity and muscle strength and endurance. Rectus femoris echo intensity, maximal voluntary contraction (MVC) force and time to task failure during a 50% MVC task were determined for 12 younger (mean age = 25 y) and 13 older (mean age = 74 y) men. Bivariate correlations between echo intensity and normalized MVC force were similar for younger and older men, but was only statistically significant for the latter (younger r = -0.559, p = 0.059; older r = -0.580, p = 0...
May 19, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28526235/zero-echo-time-mri-only-treatment-planning-for-radiation-therapy-of-brain-tumors-after-resection
#2
C Boydev, B Demol, D Pasquier, H Saint-Jalmes, G Delpon, N Reynaert
Using magnetic resonance imaging (MRI) as the sole imaging modality for patient modeling in radiation therapy (RT) is a challenging task due to the need to derive electron density information from MRI and construct a so-called pseudo-computed tomography (pCT) image. We have previously published a new method to derive pCT images from head T1-weighted (T1-w) MR images using a single-atlas propagation scheme followed by a post hoc correction of the mapped CT numbers using local intensity information. The purpose of this study was to investigate the performance of our method with head zero echo time (ZTE) MR images...
May 16, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28520778/texture-analysis-using-proton-density-and-t2-relaxation-in-patients-with-histological-usual-interstitial-pneumonia-uip-or-nonspecific-interstitial-pneumonia-nsip
#3
Maria T A Buzan, Andreas Wetscherek, Claus Peter Heussel, Michael Kreuter, Felix J Herth, Arne Warth, Hans-Ulrich Kauczor, Carmen Monica Pop, Julien Dinkel
OBJECTIVES: The purpose of our study was to assess proton density (PD) and T2 relaxation time of usual interstitial pneumonia (UIP) and nonspecific interstitial pneumonia (NSIP) and to evaluate their utility in differentiating the two patterns. Furthermore, we aim to investigate whether these two parameters could help differentiate active-inflammatory and stable-fibrotic lesions in NSIP. METHODS: 32 patients (mean age: 69 years; M:F, 1:1) with pathologically proven disease (UIP:NSIP, 1:1), underwent thoracic thin-section multislice CT scan and 1...
2017: PloS One
https://www.readbyqxmd.com/read/28502664/the-utility-of-susceptibility-weighted-imaging-to-evaluate-the-extent-of-iron-accumulation-in-the-choroid-plexus-of-patients-with-%C3%AE-thalassaemia-major
#4
Z I Hasiloglu, M Asik, E Ure, F Ertem, H Apak, S Albayram
AIM: To assess iron accumulation in the choroid plexus of β-thalassaemia patients using fast spin echo (FSE) T2-weighted, gradient echo (GRE) T2*-weighted, susceptibility-weighted imaging (SWI) and compare the results. MATERIALS AND METHODS: Eighteen patients with transfusion-dependent β-thalassaemia and the control group underwent magnetic resonance imaging (MRI) examinations. Signal intensities were separately evaluated using a "number of hypointensity in the choroid plexus" (NHICP) grading system on axial FSE T2-weighted, GRE T2*-weighted, and SWI images...
May 11, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28492489/an-automatic-localization-algorithm-for-ultrasound-breast-tumors-based-on-human-visual-mechanism
#5
Yuting Xie, Ke Chen, Jiangli Lin
Human visual mechanisms (HVMs) can quickly localize the most salient object in natural images, but it is ineffective at localizing tumors in ultrasound breast images. In this paper, we research the characteristics of tumors, develop a classic HVM and propose a novel auto-localization method. Comparing to surrounding areas, tumors have higher global and local contrast. In this method, intensity, blackness ratio and superpixel contrast features are combined to compute a saliency map, in which a Winner Take All algorithm is used to localize the most salient region, which is represented by a circle...
May 11, 2017: Sensors
https://www.readbyqxmd.com/read/28491295/magnetic-resonance-imaging-planning-in-children-with-complex-congenital-heart-disease-a-new-approach
#6
Israel Valverde, Tarinee Tangcharoen, Tarique Hussain, Hubrecht de Bliek, Graeme Penney, Marcel Breeuwer, Tobias Schaeffter, Reza Razavi, Gerald Greil
OBJECTIVES: To compare a standard sequential 2D Planning Method (2D-PM) with a 3D offline Planning Method (3D-PM) based on 3D contrast-enhanced magnetic resonance angiography (CE-MRA) in children with congenital heart disease (CHD). DESIGN: In 14 children with complex CHD (mean: 2.6 years, range: 3 months to 7.6 years), axial and coronal cuts were obtained with single slice spin echo sequences to get the final double oblique longitudinal cut of the targeted anatomical structure (2D-PM, n = 31)...
January 2017: JRSM Cardiovascular Disease
https://www.readbyqxmd.com/read/28482430/-high-resolution-diffusion-weighted-imaging-for-characterising-nasopharyngeal-carcinoma
#7
Y Wang, G J Wang, Y Ye, Y T Lu, W H Wu, S L Li
Objective: To evaluate the characteristics of high resolution diffusion-weighted imaging(DWI) using readout segmentation of long variable echo trains (RESOLVE ) for nasopharyngeal carcinoma (NPC). Methods: A total of 131 with newly diagnosed NPC patients from the 5th Affiliated Hospital of Sun Yat-sen University were included in this study from October 2013 to April 2016.DWI using RESOLVE technique was performed. The signal intensity (SI(lesion)), and mean(ADC(mean)), maximum(ADC(max)), minimum (ADC(min))ADCs of NPC were calculated...
May 9, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28482216/arbitrary-waveform-modulated-pulse-epr-at-200ghz
#8
Ilia Kaminker, Ryan Barnes, Songi Han
We report here on the implementation of arbitrary waveform generation (AWG) capabilities at ∼200GHz into an Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) instrument platform operating at 7T. This is achieved with the integration of a 1GHz, 2 channel, digital to analog converter (DAC) board that enables the generation of coherent arbitrary waveforms at Ku-band frequencies with 1ns resolution into an existing architecture of a solid state amplifier multiplier chain (AMC). This allows for the generation of arbitrary phase- and amplitude-modulated waveforms at 200GHz with >150mW power...
April 27, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28469245/micro-doppler-measurement-of-insect-wing-beat-frequencies-with-w-band-coherent-radar
#9
Rui Wang, Cheng Hu, Xiaowei Fu, Teng Long, Tao Zeng
The wingbeat frequency of insect migrant is regarded potentially valuable for species identification and has long drawn widespread attention in radar entomology. Principally, the radar echo signal can be used to extract wingbeat information, because both the signal amplitude and phase could be modulated by wing-beating. With respect to existing entomological radars, signal amplitude modulation has been used for wingbeat frequency measurement of large insects for many years, but the wingbeat frequency measurement of small insects remains a challenge...
May 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28468744/accuracy-of-turbo-spin-echo-diffusion-weighted-imaging-signal-intensity-measurements-for-the-diagnosis-of-cholesteatoma
#10
Burçe Özgen, Elif Bulut, Anıl Dolgun, Munir Demir Bajin, Levent Sennaroğlu
PURPOSE: We aimed to evaluate the diagnostic accuracy of turbo spin-echo diffusion-weighted imaging (TSE-DWI) at 3 T, for cholesteatoma (CS) diagnosis, using qualitative and quantitative methods with numerical assessment of signal intensity (SI), signal intensity ratios (SIR), and apparent diffusion coefficient (ADC) values. METHODS: In this retrospective study, two blinded observers independently evaluated the preoperative TSE-DWI images of 57 patients who were imaged with a presumed diagnosis of CS...
May 4, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28464679/an-extended-surface-target-for-high-frequency-multibeam-echo-sounder-calibration
#11
John L Heaton, Glen Rice, Thomas C Weber
An extended calibration target has been developed for calibrating the intensity output of a multibeam echo sounder (MBES). The target was constructed of chain links arranged similar to a curtain, providing an extended surface target with a mean scattering strength of -17.8 dB at 200 kHz. The target was used to calibrate a 200 kHz MBES, and the MBES was subsequently used to collect seafloor backscatter over sand and gravel seafloors. Field results were compared with calibrated split-beam echo sounder measurements at an incidence angle of 45°...
April 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28463165/novel-super-resolution-approach-to-time-resolved-volumetric-4-dimensional-magnetic-resonance-imaging-with-high-spatiotemporal-resolution-for-multi-breathing-cycle-motion-assessment
#12
Guang Li, Jie Wei, Mo Kadbi, Jason Moody, August Sun, Shirong Zhang, Svetlana Markova, Kristen Zakian, Margie Hunt, Joseph O Deasy
PURPOSE: To develop and evaluate a super-resolution approach to reconstruct time-resolved 4-dimensional magnetic resonance imaging (TR-4DMRI) with a high spatiotemporal resolution for multi-breathing cycle motion assessment. METHODS AND MATERIALS: A super-resolution approach was developed to combine fast 3-dimensional (3D) cine MRI with low resolution during free breathing (FB) and high-resolution 3D static MRI during breath hold (BH) using deformable image registration...
June 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28460168/spectroscopic-characterization-of-adsorbed-13-co2-on-3-aminopropylsilyl-modified-sba15-mesoporous-silica
#13
Chia-Hsin Chen, Daphna Shimon, Jason J Lee, Stephanie A Didas, Anil K Mehta, Carsten Sievers, Christopher W Jones, Sophia E Hayes
Multiple chemisorption products are found from the interaction of CO2 with the solid-amine sorbent, 3-aminopropyl silane (APS), bound to mesoporous silica (SBA15) using solid-state NMR and FTIR spectroscopy. We employed a combination of both (15)N{(13)C} rotational-echo double-resonance (REDOR) NMR and (13)C{(15)N} REDOR to determine the chemical identity of these products. (15)N{(13)C} REDOR measurements are consistent with a single (13)C-(15)N pair and distance of 1.45 Å. In contrast, both (13)C{(15)N} REDOR and (13)C CPMAS are consistent with multiple (13)C products...
May 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28454765/black-blood-t2-mapping-with-delay-alternating-with-nutation-for-tailored-excitation
#14
Shi Su, Yanan Ren, Caiyun Shi, Xiaoyong Zhang, Jim X Ji, Yongqin Zhang, Xin Liu, Guoxi Xie
PURPOSE: To develop a black-blood T2* mapping method using a Delay Alternating with Nutation for Tailored Excitation (DANTE) preparation combined with a multi-echo gradient echo (GRE) readout (DANTE-GRE). MATERIALS AND METHODS: Simulations of the Bloch equation for DANTE-GRE were performed to optimize sequence parameters. After optimization, the sequence was applied to a phantom scan and to neck and lower extremity scans conducted on 12 volunteers at 3T using DANTE-GRE, Motion-Sensitized Driven Equilibrium (MSDE)-GRE, and multi-echo GRE...
April 25, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28449215/rapid-degradation-of-longer-dna-fragments-enables-the-improved-estimation-of-distribution-and-biomass-using-environmental-dna
#15
Toshiaki Jo, Hiroaki Murakami, Reiji Masuda, Masayuki Sakata, Satoshi Yamamoto, Toshifumi Minamoto
The advent of environmental DNA (eDNA) analysis methods has enabled rapid and wide-range ecological monitoring in aquatic ecosystems, but there is a dearth of information on eDNA degradation. The results of previous studies suggest that the decay rate of eDNA varies depending on the length of DNA fragments. To examine this hypothesis, we compared temporal change in copy number of long eDNA fragments (719 bp) with that of short eDNA fragments (127 bp). First, we isolated rearing water from a target fish species, Japanese Jack Mackerel (Trachurus japonicus), and then quantified the copy number of the long and short eDNA fragments in 1 L water samples after isolating the water from the fish...
April 27, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28445998/infrared-raman-and-magnetic-resonance-spectroscopic-study-of-sio2-c-nanopowders
#16
Dariya Savchenko, Vladimir Vorliček, Ekaterina Kalabukhova, Aleksandr Sitnikov, Andrii Vasin, Dmytro Kysil, Stanislav Sevostianov, Valentyn Tertykh, Alexei Nazarov
Optical and magnetic properties of SiO2:C nanopowders obtained by chemical and thermal modification of fumed silica were studied by Fourier transform infrared spectroscopy, Raman, continuous wave (CW) electron paramagnetic resonance (EPR), echo-detected EPR and pulsed electron nuclear double resonance (ENDOR) spectroscopy. Two overlapping signals of Lorentzian lineshape were detected in CW EPR spectra of the initial SiO2:C. The EPR signal at g = 2.0055(3) is due to the silicon dangling bonds, which vanishes after thermal annealing, and the second EPR signal at g = 2...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28444420/periportal-lymphatic-system-on-post-hepatobiliary-phase-gd-eob-dtpa-enhanced-mr-imaging-in-normal-subjects-and-patients-with-chronic-hepatitis-c
#17
Yasunari Yamada, Shunro Matsumoto, Hiromu Mori, Ryo Takaji, Maki Kiyonaga, Naoki Hijiya, Rika Tanoue, Kenichiro Tomonari, Shuichi Tanoue, Norio Hongo, Masayuki Ohta, Masataka Seike, Masafumi Inomata, Kazunari Murakami, Masatsugu Moriyama
PURPOSE: We sought to evaluate visualization of periportal lymphatics and lymph nodes (lymphatic system) on Gd-EOB-DTPA-enhanced magnetic resonance (MR) images using a fat-suppressed T2-weighted sequence with 3-dimensional (3D) volume isotropic turbo spin echo acquisition (VISTA) at 3.0 T in normal subjects and patients with chronic hepatitis C. METHODS: MR imaging was performed in 254 subjects between June 2013 and May 2016. After applying inclusion and exclusion criteria, the final population was 31 normal subjects and 34 patients with chronic hepatitis C...
April 25, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28441722/experimental-demonstration-and-circuitry-for-a-very-compact-coil-only-pulse-echo-emat
#18
Dirk Rueter
This experimental study demonstrates for the first time a solid-state circuitry and design for a simple compact copper coil (without an additional bulky permanent magnet or bulky electromagnet) as a contactless electromagnetic acoustic transducer (EMAT) for pulse echo operation at MHz frequencies. A pulsed ultrasound emission into a metallic test object is electromagnetically excited by an intense MHz burst at up to 500 A through the 0.15 mm filaments of the transducer. Immediately thereafter, a smoother and quasi "DC-like" current of 100 A is applied for about 1 ms and allows an echo detection...
April 22, 2017: Sensors
https://www.readbyqxmd.com/read/28434654/compulsive-addiction-like-aggressive-behavior-in-mice
#19
Sam A Golden, Conor Heins, Marco Venniro, Daniele Caprioli, Michelle Zhang, David H Epstein, Yavin Shaham
BACKGROUND: Some people are highly motivated to seek aggressive encounters, and among those who have been incarcerated for such behavior, recidivism rates are high. These observations echo two core features of drug addiction: high motivation to seek addictive substances, despite adverse consequences, and high relapse rates. Here we used established rodent models of drug addiction to determine whether they would be sensitive to "addiction-like" features of aggression in CD-1 mice. METHODS: In experiments 1 and 2, we trained older CD-1 mice to lever press for opportunities to attack younger C57BL6/J mice...
March 17, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28431589/t2-relaxometry-helps-prognosticate-seizure-outcome-in-patients-with-solitary-cerebral-cysticercosis
#20
Aaron de Souza, Atchayaram Nalini, Jitender Saini, Kandavel Thennarasu
OBJECTIVE: Correlate serial T2 relaxometry (T2R) values with long term seizure outcome in patients with solitary cerebral cysticercosis (SCC) in order to establish its usefulness as a prognostic marker in these patients. METHODS: Patients with new-onset seizures due to SCC were imaged serially using a pre-determined MRI protocol at enrolment and after 3, 6, 12 and 24months. T2 relaxometry was performed using a dual echo sequence with maps generated manually from the measured image intensities at the level of the lesion...
May 15, 2017: Journal of the Neurological Sciences
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