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https://www.readbyqxmd.com/read/29676169/thirty-minutes-of-running-exercise-decreases-t2-signal-intensity-but-not-thickness-of-the-knee-joint-cartilage-a-3-0-t-magnetic-resonance-imaging-study
#1
Yiğitcan Karanfil, Naila Babayeva, Gürhan Dönmez, H Barış Diren, Muzaffer Eryılmaz, Mahmut Nedim Doral, Feza Korkusuz
Objective Recent studies showed a potential of magnetic resonance imaging (MRI), which can be used as an additional tool for diagnosing cartilage degeneration in the early stage. We designed a cross-sectional study in order to evaluate knee joint cartilage adaptation to running, using 3.0-T MRI equipped with the 3-dimensional turbo spin echo (VISTA = Volume ISotropic Turbo spin echo Acquisition) software. By this thickness (mm) and signal intensity (mean pixel value) can be quantified, which could be closely related to the fluid content of the knee joint cartilage, before and after running...
April 1, 2018: Cartilage
https://www.readbyqxmd.com/read/29666207/split-hand-muscle-echo-intensity-index-as-a-reliable-imaging-marker-for-differential-diagnosis-of-amyotrophic-lateral-sclerosis
#2
Hung Youl Seok, Jinseok Park, Yoo Hwan Kim, Ki-Wook Oh, Seung Hyun Kim, Byung-Jo Kim
OBJECTIVE: The objective of this study was to investigate the usefulness of muscle ultrasound in evaluating dissociated small hand muscle atrophy, termed 'split hand', and its feasibility in the diagnosis of amyotrophic lateral sclerosis (ALS). METHODS: Forty-four patients with ALS, 18 normal subjects and 9 patients with other neuromuscular disorders were included in this study. The hand muscles were divided into three regions, the median-innervated lateral hand muscle group (ML), the ulnar-innervated lateral hand muscle (UL) and the ulnar-innervated medial hand muscle (UM), and the muscle echo intensity (EI) and compound muscle action potential (CMAP) were measured...
April 17, 2018: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/29650485/providing-transthoracic-echocardiography-training-for-intensive-care-unit-trainees-an-educational-improvement-initiative
#3
Catherine M Kuza, M Tariq Hanifi, Melissa Koç, Matthias Stopfkuchen-Evans
OBJECTIVE: Transthoracic echocardiography (TTE) is important in the management of critically ill patients, yet it has not been incorporated into many residency programs' curricula. Our objective is to determine if trainees undergoing a 60-minute training session on TTE have improved knowledge, ultrasound skills, and increases the utilization of TTE during their rotation in the intensive care unit (ICU). We will also compare the results of participants with prior TTE exposure to TTE-naïve trainees...
April 9, 2018: Journal of Surgical Education
https://www.readbyqxmd.com/read/29650397/assessment-of-five-different-probes-for-lung-ultrasound-in-critically-ill-patients-a-pilot-study
#4
Xavier Bobbia, Margaux Chabannon, Thierry Chevallier, Jean Emmanuel de La Coussaye, Jean Yves Lefrant, Sarah Pujol, Pierre-Géraud Claret, Laurent Zieleskiewicz, Claire Roger, Laurent Muller
INTRODUCTION: The present study was aimed at comparing the diagnosis concordance of five echo probes of lung ultrasound (LUS) with CT scans in intensive care and emergency patients with acute respiratory failure. MATERIALS: This prospective, observational, pilot study involved 10 acute patients in whom a thoracic CT scan was performed. An expert performed an LUS reference exam using five different probes: three probes with a high-quality conventional echo machine (cardiac phased-array probe, abdominal convex probe, linear probe) and two probes (cardiac and linear) with a pocket ultrasound device (PUD)...
April 3, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29648902/diagnostic-evaluation-in-steroid-induced-myopathy-case-report-suggesting-clinical-utility-of-quantitative-muscle-ultrasonography
#5
Marco Alessandro Minetto, Cristina Caresio, Valentina D'Angelo, Fabio Lanfranco, Lucia Ghizzoni, Silvestro Roatta, Emanuela Arvat, Santosh Kesari
PURPOSE: We present a patient with adrenal Cushing's syndrome causing steroid myopathy. The purpose of the case report is to illustrate the clinical usefulness of quantitative muscle ultrasonography for the assessment of glucocorticoid-induced changes in muscle mass (MM) and structure. METHODS: Assessments of physical performance, muscle strength, MM (i.e., total body skeletal MM, appendicular skeletal MM, and thickness of lower limb muscles), and muscle structure (i...
April 12, 2018: Endocrine Research
https://www.readbyqxmd.com/read/29643602/influence-of-the-ultrasound-transducer-tilt-on-muscle-thickness-and-echo-intensity-of-the-rectus-femoris-muscle-of-healthy-subjects
#6
Hiroshi Ishida, Tadanobu Suehiro, Keita Suzuki, Tsuyoshi Yoneda, Susumu Watanabe
[Purpose] This study aimed to assess the influence of ultrasound (US) transducer tilt on muscle thickness and echo intensity of the rectus femoris muscle (RF) in healthy subjects. [Subjects and Methods] Fourteen healthy male subjects (20.8 ± 0.8 years) participated in this study. Transducer tilt was measured during US, with a digital angle gauge. Muscle thickness and echo intensity were measured in 4 transducer tilt conditions: reference angle; +3°; +6°; and +9° cranial from the reference angle. [Results] All differences in transducer tilt relative to the reference condition were larger than the minimal detectable change (MDC) of the reference condition...
December 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29614227/investigating-the-secondary-structure-of-membrane-peptides-utilizing-multiple-2h-labeled-hydrophobic-amino-acids-via-electron-spin-echo-envelope-modulation-eseem-spectroscopy
#7
Lishan Liu, Indra Dev Sahu, Lauren Bottorf, Robert M McCarrick, Gary A Lorigan
An Electron Spin Echo Envelope Modulation (ESEEM) approach was recently developed in the Lorigan lab to probe local secondary structures of membrane proteins and peptides. This ESEEM method detects dipolar couplings between 2H-labeled nuclei on the side chains of an amino acid (Leu or Val) and a strategically placed nitroxide spin-label in the proximity up to 8 Å. ESEEM spectra patterns for different samples correlate directly to the periodic structural feature of different secondary structures. Since this pattern can be affected by the side chain length and flexibility of the 2H-labeled amino acid used in the experiment, it is important to examine several different hydrophobic amino acids (d3 Ala, d8 Val, d8 Phe) utilizing this ESEEM approach...
April 3, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29611197/dceus-based-multi-parametric-perfusion-imaging-using-pulse-inversion-bubblet-decorrelation
#8
Diya Wang, Zhe Su, Yu Zhang, Xiaoyan Zhao, Supin Wang, Mingxi Wan
PURPOSE: This study aimed to clarify the influences of composite dynamic contrast-enhanced ultrasound (DCEUS) on multi-parametric perfusion imaging (PPI) and to develop a novel PPI scheme through pulse-inversion Bubblet decorrelation (PIBD) to improve its contrast and detailed discriminability. METHOD: In in vivo perfusion experiments on rabbit kidneys, a pair of phase-inverted 'Bubblets' was constructed. Phase-inverted raw radiofrequency echoes were reconstructed by using the maximum coefficients obtained from Bubblet decorrelation analysis and summed to form DCEUS loops...
April 2, 2018: Medical Physics
https://www.readbyqxmd.com/read/29610088/fabrication-and-characterization-of-single-aperture-3-5-mhz-bnt-based-ultrasonic-transducer-for-therapeutic-application
#9
Elaheh Taghaddos, T Ma, Hui Zhong, Qifa Zhou, M X Wan, Ahmad Safari
This paper discusses the fabrication and characterization of 3.5-MHz single-element transducers for therapeutic applications in which the active elements are made of hard lead-free BNT-based and hard commercial PZT (PZT-841) piezoceramics. Composition of (BiNa0.88 K0.08 Li0.04 )0.5 (Ti0.985 Mn0.015 )O3 (BNKLT88-1.5Mn) was used to develop lead-free piezoelectric ceramic. Mn-doped samples exhibited high mechanical quality factor ( ) of 970, thickness coupling coefficient ( ) of 0.48, a dielectric constant ( ) of 310 (at 1 kHz), depolarization temperature ( ) of 200 °C, and coercive field ( ) of 52...
April 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29610083/a-spatial-coherence-approach-to-minimum-variance-beamforming-for-plane-wave-compounding
#10
Nghia Q Nguyen, Richard W Prager
A new approach to implement minimum variance distortionless response (MVDR) beamforming is introduced for coherent plane-wave compounding (CPWC). MVDR requires the covariance matrix of the incoming signal to be estimated and a spatial smoothing approximation is usually adopted to prevent this calculation from being underconstrained. In the new approach, we analyze MVDR as a spatial filter that decorrelates signals received at individual channels before summation. Based on the analysis, we develop two MVDR beamformers without using any spatial smoothing...
April 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29606725/sacrocaudal-sacrococcygeal-intervertebral-disc-protrusion-in-2-cats
#11
Gianluca Magi, Giunio Bruto Cherubini, Olivier Taeymans
One cat was presented for investigation of urinary retention and constipation and a second cat was presented with decreased appetite, reluctance to jump, reduced level of activity, and constipation. Magnetic resonance imaging revealed dorsal bulging of the hypo-intense intervertebral disc at S3-Cd1 on fast spin echo T2. Dorsal laminectomy was performed and both cats recovered with resolution of neurological signs.
April 2018: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
https://www.readbyqxmd.com/read/29575029/a-practical-approach-to-quantitative-grayscale-ultrasound-analysis-of-hepatic-steatosis-in-pediatric-patients-using-a-picture-archiving-and-communication-system-based-tool
#12
Iclal Erdem Toslak, Jennifer E Lim-Dunham, Cara Joyce, Marko E Marbella
OBJECTIVES: To evaluate the efficacy of a picture archiving and communication system (PACS)-based ultrasound (US) quantification technique for diagnosis of hepatic steatosis in a pediatric population. METHODS: Abdominal US images of 49 pediatric patients (≤18 years) with histopathologically proven diagnoses of hepatic steatosis (n = 17), nonsteatotic liver disease (n = 19), and a normal liver (n = 13) were retrospectively reviewed. Patient demographics, the fibrosis stage, and the steatosis grade were obtained from the database...
March 25, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29571794/non-contrast-enhanced-magnetic-resonance-imaging-detects-mosaic-signal-intensity-in-early-cystic-fibrosis-lung-disease
#13
Patricia Leutz-Schmidt, Mirjam Stahl, Olaf Sommerburg, Monika Eichinger, Michael U Puderbach, Jens-Peter Schenk, Abdulsattar Alrajab, Simon M F Triphan, Hans-Ulrich Kauczor, Marcus A Mall, Mark O Wielpütz
OBJECTIVES: To determine if morphological non-contrast enhanced magnetic resonance imaging (MRI) of the lung is sensitive to detect mosaic signal intensity in infants and preschool children with cystic fibrosis (CF). MATERIALS AND METHODS: 50 infant and preschool CF patients (mean age 3.5 ± 1.4y, range 0-6y) routinely underwent morphological (T2-weighted turbo-spin echo sequence with half-Fourier acquisition, HASTE) and contrast-enhanced 4D perfusion MRI (gradient echo sequence with parallel imaging and echo sharing, TWIST)...
April 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29571699/diffusion-weighted-magnetic-resonance-imaging-of-extraocular-muscles-in-patients-with-grave-s-ophthalmopathy-using-turbo-field-echo-with-diffusion-sensitized-driven-equilibrium-preparation
#14
A Hiwatashi, O Togao, K Yamashita, K Kikuchi, D Momosaka, H Honda
PURPOSE: The purpose of this study was to correlate diffusivity of extraocular muscles, measured by three-dimensional turbo field echo (3DTFE) magnetic resonance (MR) imaging using diffusion-sensitized driven-equilibrium preparation, with their size and activity in patients with Grave's ophthalmopathy. MATERIALS AND METHODS: Twenty-three patients with Grave's ophthalmopathy were included. There were 17 women and 6 men with a mean age of 55.8±12.6 (SD) years (range: 26-83 years)...
March 20, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29565674/novel-practical-snr-determination-method-for-mri-using-double-echo-with-longest-second-echo-time-delset
#15
Naoki Ohno, Tosiaki Miyati, Yoshiaki Niwa, Hirohito Kan, Shota Ishida, Harumasa Kasai, Yuta Shibamoto, Toshifumi Gabata
OBJECTIVE: We devised a practical method using double echo with the longest second echo time (DELSET) for simple and accurate signal-to-noise ratio (SNR) measurement of magnetic resonance images (MRIs). METHODS: The DELSET method is based on the double-echo sequence in which the first and second echo times (TE) are set, respectively, as the clinically acceptable time for the signal image and as the longest time for the noise image. The second TE needs to be at least 8 times longer than T2 (for spin-echo) or T2 * (for gradient-echo) of the objective tissue...
March 22, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29561895/untangling-the-r2-contrast-in-multiple-sclerosis-a-combined-mri-histology-study-at-7-0-tesla
#16
Francesca Bagnato, Simon Hametner, Emma Boyd, Verena Endmayr, Yaping Shi, Vasiliki Ikonomidou, Guanhua Chen, Siddharama Pawate, Hans Lassmann, Seth Smith, E Brian Welch
T2*-weighted multi-echo gradient-echo magnetic resonance imaging and its reciprocal R2* are used in brain imaging due to their sensitivity to iron content. In patients with multiple sclerosis who display pathological alterations in iron and myelin contents, the use of R2* may offer a unique way to untangle mechanisms of disease. Coronal slices from 8 brains of deceased multiple sclerosis patients were imaged using a whole-body 7.0 Tesla MRI scanner. The scanning protocol included three-dimensional (3D) T2*-w multi-echo gradient-echo and 2D T2-w turbo spin echo (TSE) sequences...
2018: PloS One
https://www.readbyqxmd.com/read/29561225/cerebrovascular-blood-oxygenation-level-dependent-pulsatility-at-baseline-and-following-acute-exercise-among-healthy-adolescents
#17
Athena E Theyers, Benjamin I Goldstein, Arron Ws Metcalfe, Andrew D Robertson, Bradley J MacIntosh
Arterial stiffness is linked to cerebral small vessel damage and neurodegeneration, but barriers to accessing deep cerebrovascular anatomy limit our ability to assess the brain. This study describes an adaptation of a cardiac-related scrubbing method as a means of generating blood oxygenation level-dependent pulsatility maps based on the cardiac cycle. We examine BOLD pulsatility at rest, based on the non-parametric deviation from null metric, as well as changes following acute physiological stress from 20 min of moderate-intensity cycling in 45 healthy adolescents...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29547501/which-classification-system-is-most-useful-for-classifying-osteonecrosis-of-the-femoral-head
#18
Kazuma Takashima, Takashi Sakai, Hidetoshi Hamada, Masaki Takao, Nobuhiko Sugano
BACKGROUND: Many studies have confirmed that the size and location of necrotic lesions are major factors that affect the prevalence of collapse and prognosis in patients with osteonecrosis of the femoral head (ONFH). Although several classification systems categorize and quantify ONFH, there is no agreement on which one is most useful for the purpose. QUESTIONS/PURPOSES: We compared the Steinberg, modified Kerboul, and Japanese Investigation Committee (JIC) classifications of ONFH in terms of (1) the correlation among the three different classification systems...
March 15, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29543882/reduction-of-emission-level-in-approach-signals-of-greater-mouse-eared-bats-myotis-myotis-no-evidence-for-a-closed-loop-control-system-for-intensity-compensation
#19
Tobias Budenz, Annette Denzinger, Hans-Ulrich Schnitzler
Bats lower the emission SPL when approaching a target. The SPL reduction has been explained by intensity compensation which implies that bats adjust the emission SPL to perceive the retuning echoes at the same level. For a better understanding of this control mechanism we recorded the echolocation signals of four Myotis myotis with an onboard microphone when foraging in the passive mode for rustling mealworms offered in two feeding dishes with different target strength, and determined the reduction rate for the emission SPL and the increase rate for the SPL of the returning echoes...
2018: PloS One
https://www.readbyqxmd.com/read/29540643/contrast-enhanced-high-resolution-mri-for-evaluating-time-course-changes-in-middle-cerebral-artery-plaques
#20
Arata Abe, Tetsuro Sekine, Yuki Sakamoto, Mina Harada-Abe, Ryo Takagi, Satoshi Suda, Kentaro Suzuki, Junya Aoki, Masami Yoneyama, Kazumi Kimura
BACKGROUND AND PURPOSE: It is clinically important to evaluate time course changes in symptomatic middle cerebral artery (MCA) stenotic plaques because of likely recurrence. The objective of this study is to determine whether contrast-enhanced high-resolution magnetic resonance imaging (MRI) is a feasible method for this purpose. METHODS: Contrast-enhanced, high-resolution, 3D turbo spin-echo images with low refocusing flip angle control (3D LOWRAT) applied to 7 patients with symptomatic MCA stenosis were evaluated at the initial (1 month after stroke onset) and follow-up (7 months after stroke onset) stages, and statistical variables, including plaque-to-thalamus signal intensity ratio, degree of stenosis, and stroke recurrence obtained at the 2 stages, were compared...
2018: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
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