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https://www.readbyqxmd.com/read/29050166/-clinic-pathological-and-ultrasonographic-features-of-primary-thyroid-lymphoma
#1
X M Zhang, L Nong, X Ran, M Li
Objective: To analyze the ultrasonographic and clinicopathological features of primary thyroid lymphoma(PTL). Methods: The ultrasonographic and clinicopathological featuresof 21 cases of pathologically-confirmed PTLs were analyzed retrospectively. Results: Of all 21 PTLs, 15 cases were diffuse large B-cell lymphoma, 4 were mucosal-associated lymphoid tissue extranodular marginal zone B-cell lymphoma, 1 was small B-cell lymphoma and 1 was classical Hodgkin lymphoma. Eight cases were proved by pathology with concomitant Hashimoto's thyroiditis...
October 10, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29047686/improved-cumulative-probabilities-and-range-accuracy-of-a-pulsed-geiger-mode-avalanche-photodiode-laser-ranging-system-with-turbulence-effects
#2
Hanjun Luo, Zhengbiao Ouyang, Qiang Liu, Zhenli Lu, Bin Li
There exists a performance limitation in a pulsed Geiger-mode avalanche photodiode laser ranging system because of the echo intensity random fluctuation caused by turbulence effects. To suppress the influence of turbulence effects, we present a cumulative pulse detection technique with the ability to achieve improved cumulative probabilities and range accuracy. Based on the modulated Poisson model, the cumulative probabilities, range accuracy, and their influencing factors are investigated for a cumulative Q-switched laser pulse train...
October 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047594/calculation-of-the-overlap-factor-for-scanning-lidar-based-on-the-tridimensional-ray-tracing-method
#3
Ruiqiang Chen, Yuesong Jiang, Luhong Wen, Donghai Wen
The overlap factor is used to evaluate the LiDAR light collection ability. Ranging LiDAR is mainly determined by the optical configuration. However, scanning LiDAR, equipped with a scanning mechanism to acquire a 3D coordinate points cloud for a specified target, is essential in considering the scanning effect at the same time. Otherwise, scanning LiDAR will reduce the light collection ability and even cannot receive any echo. From this point of view, we propose a scanning LiDAR overlap factor calculation method based on the tridimensional ray-tracing method, which can be applied to scanning LiDAR with any special laser intensity distribution, any type of telescope (reflector, refractor, or mixed), and any shape obstruction (i...
June 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29033638/tolosa-hunt-syndrome-cranial-neuroimaging-findings
#4
Çetin Kürşad Akpinar, Taner Özbenli, Hakan Doğru, Lütfi Incesu
INTRODUCTION: The etiology of Tolosa-Hunt Syndrome (THS) is still unknown. The initial standard magnetic resonance imaging (MRI) may not be sufficient for diagnosis, so dynamic contrast-enhanced MRI may be necessary to demonstrate the presence of lesions. METHODS: Seven patients diagnosed with THS according to the International Headache Society criteria (beta version) were included into the study. Patients were assessed in terms of type, age, symptoms and findings, accompanying disease, localization of the determined lesion, response to treatment, and clinical progress...
September 2017: Noro Psikiyatri Arsivi
https://www.readbyqxmd.com/read/29027037/optimal-surface-property-for-three-dimensional-echo-visualization
#5
Shunsuke Asakura, Saki Nishikawa, Kazumasa Orihashi, Yoshio Inoue
PURPOSE: Three-dimensional (3D) echo is a useful modality to guide off-pump intracardiac surgery, and this study aimed to determine the optimal surface property for minimizing echo dropout and grating lobes. METHODS: A total of 13 specimens were examined. The specimens were scanned while they were rotated from 0° to 90°, and en face views were recorded in the 3D zoom mode. Changes in brightness were compared with the surface profile, which was traced from microscopic images...
October 12, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29026115/visual-sensory-stimulation-interferes-with-people-s-ability-to-echolocate-object-size
#6
L Thaler, D Foresteire
Echolocation is the ability to use sound-echoes to infer spatial information about the environment. People can echolocate for example by making mouth clicks. Previous research suggests that echolocation in blind people activates brain areas that process light in sighted people. Research has also shown that echolocation in blind people may replace vision for calibration of external space. In the current study we investigated if echolocation may also draw on 'visual' resources in the sighted brain. To this end, we paired a sensory interference paradigm with an echolocation task...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29018823/a-high-frequency-geometric-focusing-transducer-based-on-1-3-piezocomposite-for-intravascular-ultrasound-imaging
#7
Xiaohua Jian, Zhile Han, Pengbo Liu, Jie Xu, Zhangjian Li, Peiyang Li, Weiwei Shao, Yaoyao Cui
Due to the small aperture of blood vessel, a considerable disadvantage to current intravascular ultrasound (IVUS) imaging transducers is that their lateral imaging resolution is much lower than their axial resolution. To solve this problem, a single-element, 50 MHz, 0.6 mm diameter IVUS transducer with a geometric focus at 3 mm was proposed in this paper. The focusing transducer was based on a geometric-shaped 1-3 piezocomposite. The impedance/phase, pulse echo, acoustic intensity field, and imaging resolution of the focusing transducer were tested...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29016473/effects-of-low-load-higher-repetition-versus-high-load-lower-repetition-resistance-training-not-performed-to-failure-on-muscle-strength-mass-and-echo-intensity-in-healthy-young-men-a-time-course-study
#8
T Ikezoe, T Kobayashi, M Nakamura, N Ichihashi
The aim of the present study was to compare the effects of low-load, higher-repetition training (LLHR) with those of high-load, lower-repetition training (HLLR) on muscle strength, mass, and echo intensity in healthy young men. Fifteen healthy men (age, 23.1 ± 2.6 years) were randomly assigned to one of the two groups: LLHR or HLLR group. Resistance training on knee extensor muscles was performed 3 days per week for 8 weeks. One-repetition maximum (1RM) strength, maximum isometric strength, muscle thickness and muscle echo intensity on ultrasonography of the rectus femoris muscle were assessed every 2 weeks...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28994660/pharmacokinetics-of-rilpivirine-and-24-week-outcomes-after-switching-from-efavirenz-in-virologically-suppressed-hiv-1-infected-adolescents
#9
Watsamon Jantarabenjakul, Suvaporn Anugulruengkitt, Naruporn Kasipong, Narukjaporn Thammajaruk, Jiratchaya Sophonphan, Torsak Bunupuradah, Tim R Cressey, Angela Colbers, David M Burger, Wanatpreeya Phongsamart, Thanyawee Puthanakit, Chitsanu Pancharoen
BACKGROUND: Rilpivirine (RPV), a non-nucleoside reverse transcriptase inhibitor drug, could be a favorable drug for maintenance therapy in HIV-infected adolescents because it has few long-term side effects. However, data among adolescents switching from efavirenz (EFV) to RPV are limited. This study investigated the pharmacokinetics (PK), safety and efficacy of RPV in virologically-suppressed HIV-1-infected adolescents after switching from EFV. METHODS: Adolescents aged 12-18 years on EFV-based antiretroviral therapy (ART) were switched from EFV to RPV (25 mg, once daily)...
October 10, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28993894/the-association-of-lumbar-intervertebral-disc-calcification-on-plain-radiographs-with-the-ute-disc-sign-on-mri
#10
Uruj Zehra, Cora Bow, Jason Pui Yin Cheung, Henry Pang, William Lu, Dino Samartzis
PURPOSE: The pathogenesis and the clinical impact of disc calcification are not well known. Utilizing ultra-short time-to-echo (UTE) magnetic resonance imaging, the UTE Disc Sign (UDS) (i.e., hypo/hyper-intense disc band) was developed and found to be more significantly related to pain and disability than the conventional T2-weighted (T2W) MRI. It has been hypothesized that the UDS may represent mineralized deposits in the disc. The following study addressed the relationship between disc calcification on plain radiographs to that of the UDS on MRI...
October 9, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28985683/effects-of-botulinum-toxin-a-therapy-and-multidisciplinary-rehabilitation-on-lower-limb-spasticity-classified-by-spastic-muscle-echo-intensity-in-post-stroke-patients
#11
Takatoshi Hara, Masahiro Abo, Hiroyoshi Hara, Kazushige Kobayashi, Yusuke Shimamoto, Yamato Shibata, Nobuyuki Sasaki, Naoki Yamada, Masachika Niimi
OBJECTIVES: The purpose of the present study was to investigate retrospectively the relationship between botulinum toxin type A plus multidisciplinary rehabilitation and muscle echo intensity in post-stroke patients with spasticity. The primary aim was to investigate whether the effects of the intervention on the improvement of spasticity depend on muscle echo intensity, and the secondary aim was to investigate whether the motor function of the lower limbs depends on muscle echo intensity...
October 6, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28985135/whole-body-diffusion-weighted-mr-imaging-of-iron-deposits-in-hodgkin-follicular-and-diffuse-large-b-cell-lymphoma
#12
Anne-Ségolène Cottereau, Sébastien Mulé, Chieh Lin, Karim Belhadj, Alexandre Vignaud, Christiane Copie-Bergman, Alice Boyez, Pierre Zerbib, Vania Tacher, Elodie Scherman, Corinne Haioun, Alain Luciani, Emmanuel Itti, Alain Rahmouni
Purpose To analyze the frequency and distribution of low-signal-intensity regions (LSIRs) in lymphoma lesions and to compare these to fluorodeoxyglucose (FDG) uptake and biologic markers of inflammation. Materials and Methods The authors analyzed 61 untreated patients with a bulky lymphoma (at least one tumor mass ≥7 cm in diameter). When a LSIR within tumor lesions was detected on diffusion-weighted images obtained with a b value of 50 sec/mm(2), a T2-weighted gradient-echo (GRE) sequence was performed and calcifications were searched for with computed tomography (CT)...
October 6, 2017: Radiology
https://www.readbyqxmd.com/read/28976476/comparison-of-unenhanced-t1-weighted-signal-intensities-within-the-dentate-nucleus-and-the-globus-pallidus-after-serial-applications-of-gadopentetate-dimeglumine-versus-gadobutrol-in-a-pediatric-population
#13
Diane M Renz, Stefanie Kümpel, Joachim Böttcher, Alexander Pfeil, Florian Streitparth, Matthias Waginger, Jürgen R Reichenbach, Ulf K Teichgräber, Hans-Joachim Mentzel
OBJECTIVE: The aim of this study was to evaluate and compare changes in T1-weighted signal intensity (SI) within the dentate nucleus (DN) and globus pallidus (GP) in a pediatric population after serial applications of the linear gadolinium-based magnetic resonance contrast medium gadopentetate dimeglumine and the more stable macrocyclic agent gadobutrol. MATERIALS AND METHODS: Institutional review board approval was obtained. Two similar pediatric patient cohorts who underwent at least 3 serial contrast-enhanced magnetic resonance imaging (MRI) examinations with sole application of gadopentetate dimeglumine or gadobutrol were analyzed...
October 2, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28974140/echodynamics-interpretation-limitations-and-clinical-integration
#14
Ashraf Roshdy
Echodynamics refers to the use of echocardiography as hemodynamic tool mostly in intensive and acute care settings. It implies a smooth drift from the classic cardiology use to a more critical care adjusted use. A more personalized approach is advocated in critical care, and echo is one way to reach such goal. Correct application necessitates optimum understanding, interpretation, and finally integration into patients' clinical management. As more critical care doctors are advancing from basic focused echo examinations to a more advanced one, this article is trying to underlie many pitfalls of critical care echocardiography in order to guide better practice...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/28973851/echolocating-bats-rely-on-audiovocal-feedback-to-adapt-sonar-signal-design
#15
Jinhong Luo, Cynthia F Moss
Many species of bat emit acoustic signals and use information carried by echoes reflecting from nearby objects to navigate and forage. It is widely documented that echolocating bats adjust the features of sonar calls in response to echo feedback; however, it remains unknown whether audiovocal feedback contributes to sonar call design. Audiovocal feedback refers to the monitoring of one's own vocalizations during call production and has been intensively studied in nonecholocating animals. Audiovocal feedback not only is a necessary component of vocal learning but also guides the control of the spectro-temporal structure of vocalizations...
September 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28972290/application-of-phase-rotation-to-stress-localization-scheme-at-3-t
#16
Osnat Volovyk, Assaf Tal
PURPOSE: Application of phase rotation to the STRESS (=STEAM+PRESS) localization scheme, to shorten echo time, minimize J-coupling dephasing and estimate B1+ inhomogeneity. STRESS (=STEAM + PRESS) simultaneously refocuses and acquires the double spin echo (SE123 ) and stimulated echo (STE- ) pathways, combining PRESS-like signal with lower chemical shift displacement as in STEAM. Phase rotation effectively separates coherence pathways, allows reduction of spoiling gradients moments leading to reduction in echo time...
October 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28967503/quantitative-3-d-ultrasound-of-the-medial-gastrocnemius-muscle-in-children-with-unilateral-spastic-cerebral-palsy
#17
Steven J Obst, Roslyn Boyd, Felicity Read, Lee Barber
Three-dimensional ultrasound (3-DUS) was used to examine the size and appearance of the medial gastrocnemius (MG) muscle in children with unilateral cerebral palsy (CP). Twenty-six children with CP and 10 typically developing (TD) children participated. Three-dimensional US images of both limbs in children with CP and the right limb in TD children were analysed using quantitative methods to determine muscle volume, global echo intensity, global echo pattern and regional echo intensity. Significant differences in MG volume and all echo parameters were found between TD and CP children...
September 26, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28958737/changes-in-spectroscopic-biomarkers-after-transcranial-direct-current-stimulation-in-children-with-perinatal-stroke
#18
Helen L Carlson, Patrick Ciechanski, Ashley D Harris, Frank P MacMaster, Adam Kirton
BACKGROUND: Perinatal stroke causes lifelong motor disability, affecting independence and quality of life. Non-invasive neuromodulation interventions such as transcranial direct current stimulation (tDCS) combined with intensive therapy may improve motor function in adult stroke hemiparesis but is under-explored in children. Measuring cortical metabolites with proton magnetic resonance spectroscopy (MRS) can inform cortical neurobiology in perinatal stroke but how these change with neuromodulation is yet to be explored...
September 13, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28958046/recurrence-quantification-for-the-analysis-of-coupled-processes-in-aging
#19
Timothy R Brick, Allison L Gray, Angela D Staples
Objectives: Aging is a complex phenomenon, with numerous simultaneous processes that interact with each other on a moment-to-moment basis. One way to quantify the interactions of these processes is by measuring how much a process is similar to its own past states or the past states of another system through the analysis of recurrence. This paper presents an introduction to recurrence quantification analysis (RQA) and cross-recurrence quantification analysis (CRQA), two dynamical systems analysis techniques that provide ways to characterize the self-similar nature of each process and the properties of their mutual temporal co-occurrence...
September 6, 2017: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28955740/characterization-of-lipid-rafts-in-human-platelets-using-nuclear-magnetic-resonance-a-pilot-study
#20
Joshua F Ceñido, Boris Itin, Ruth E Stark, Yung-Yu Huang, Maria A Oquendo, J John Mann, M Elizabeth Sublette
Lipid microdomains ('lipid rafts') are plasma membrane subregions, enriched in cholesterol and glycosphingolipids, which participate dynamically in cell signaling and molecular trafficking operations. One strategy for the study of the physicochemical properties of lipid rafts in model membrane systems has been the use of nuclear magnetic resonance (NMR), but until now this spectroscopic method has not been considered a clinically relevant tool. We performed a proof-of-concept study to test the feasibility of using NMR to study lipid rafts in human tissues...
July 2017: Biochemistry and Biophysics Reports
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