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https://www.readbyqxmd.com/read/29911004/measurement-of-mouse-heart-rate-variability-using-echocardiographic-system
#1
Filipe Fernandes Stoyell-Conti, Fernando Santos, Jacqueline Freire Machi, Diana Rosa Hernandez, Catarina Andrade Barboza, Maria-Cláudia Irigoyen, Kátia De Angelis, Mariana Morris
Aim: We employed an echocardiographic (ECHO) system as the backbone for the collection of electrocardiogram (ECG) and heart rate variability (HRV) data. The system was tested using an exercise model in which C57 male mice were exposed to sham or forced wheel running. Methods: Peak/peak (RR) interval was recorded over a 3 min period using the ECG platform of the ECHO system. Isoflurane-anesthetized male mice were divided into two groups ( n = 8/group): sedentary (S) and forced wheel trained (T)...
April 2018: Journal of Cardiovascular Echography
https://www.readbyqxmd.com/read/29910544/competence-of-intensivists-in-focused-transthoracic-echocardiography-in-intensive-care-unit-a-prospective-observational-study
#2
Muthapillai Senthilnathan, Pankaj Kundra, Sandeep Kumar Mishra, Savitri Velayudhan, Ajith Ananthakrishna Pillai
Objectives: Focused transthoracic echocardiography (fTTE) in critical care can be used to assess patient's volume status, ventricular contractility, right ventricle chamber size, and valvular abnormalities. The objective of the study was to assess the competency of intensivists in performing fTTE in Intensive Care Unit (ICU) patients after a brief training course by cardiologist using a specific ECHO protocol. Methods: One hundred and four patients in ICU were recruited for this prospective observational study over a period of 12 months...
May 2018: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/29903925/prognostic-implications-of-gadolinium-enhancement-of-skull-base-chordomas
#3
E Lin, T Scognamiglio, Y Zhao, T H Schwartz, C D Phillips
BACKGROUND AND PURPOSE: Skull base chordomas often demonstrate variable MR imaging characteristics, and there has been limited prior research investigating the potential clinical relevance of this variability. The purpose of this retrospective study was to assess the prognostic implications of signal intensity on standard imaging techniques for the biologic behavior of skull base chordomas. MATERIALS AND METHODS: Medical records were retrospectively reviewed for 22 patients with pathologically confirmed skull base chordomas...
June 14, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29888525/consistency-of-novel-ultrasound-equations-for-estimating-percent-intramuscular-fat
#4
Adam M Burton, Matt S Stock
INTRODUCTION: Echo intensity reflects both intramuscular adiposity and fibrous tissue content. Recently, equations that allow investigators to estimate the percentage of intramuscular fat for individual muscles via measurements of echo intensity and subcutaneous fat were created. However, as the trial-to-trial consistency of these values has not been reported in the literature, it is unclear if they can be used to track changes during physical activity and/or nutritional interventions...
June 11, 2018: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/29882563/assessment-of-fluid-responsiveness-in-the-acute-medical-patient-and-the-role-of-echocardiography
#5
P Parulekar, T Harris
Both hyper and hypovolaemia have been associated with poor outcomes. Assessment of fluid responsiveness is challenging in the acute medical patient, due to time constraints, limited evidence and quite often the lack of accurate assessment tools on the Acute Medicine Unit (AMU). This article explains how focused echo assessment is quick and easy to use for this purpose on the acute medical take and highlights key principles to bear in mind when assessing for hypovolaemia and whether to administer fluid therapy...
2018: Acute Medicine
https://www.readbyqxmd.com/read/29874652/adaptations-for-substrate-gleaning-in-bats-the-pallid-bat-as-a-case-study
#6
Khaleel A Razak
Substrate gleaning is a foraging strategy in which bats use a mixture of echolocation, prey-generated sounds, and vision to localize and hunt surface-dwelling prey. Many substrate-gleaning species depend primarily on prey-generated noise to hunt. Use of echolocation is limited to general orientation and obstacle avoidance. This foraging strategy involves a different set of selective pressures on morphology, behavior, and auditory system organization of bats compared to the use of echolocation for both hunting and navigation...
June 6, 2018: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/29860742/-involutive-and-hypertensive-fibrosive-transformation-of-the-heart-in-formation-of-myocardial-dysfunction-and-chronic-heart-failure
#7
N K Gorshunova, N V Medvedev, V V Savich
To assess the conjugation of involutive and hypertensive fibrotic transformation of the heart formation with myocardial dysfunction and chronic heart failure (CHF), 30 normotensive individuals and 60 elderly patients with arterial hypertension (AH) (mean age - 66±0,7 years) were examined by echo and dopplercardiography, estimation of the volume fraction of interstitial collagen (VFIC) in the myocardium, serum concentrations of markers of systemic collagenogenesis, using a six-minute walk test. A higher intensity of LV myocardial fibrosis was revealed with a significant increase in the VFIC content in elderly patients with AH compared with normotensive patients, which indicates the predominance of interstitial collagenogenesis over collagenolysis...
2018: Advances in Gerontology, Uspekhi Gerontologii
https://www.readbyqxmd.com/read/29848216/method-for-recovering-lost-ultrasonic-information-using-the-echo-intensity-mean
#8
Sara Bahramian, Craig K Abbey, Michael F Insana
The axial resolution of a B-mode (or intensity) image is limited by the bandwidth of the pulse envelope. In this report, we investigate the source of this limitation by examining the transfer of high-resolution information from the tissue impedance variance throughout the imaging process. For that purpose, we express the mean and variance of the echo-intensity signal as a linear system to track the flow of object information along the image-formation chain. The results reveal how demodulation influences the available information by discarding high spatial-frequency information...
May 1, 2018: Ultrasonic Imaging
https://www.readbyqxmd.com/read/29794406/inter-individual-comparison-of-gadobutrol-and-gadoteridol-tissue-time-intensity-profiles-for-dynamic-susceptibility-contrast-perfusion-mr-imaging
#9
Masahiro Yamada, Toshiaki Taoka, Ai Kawaguchi, Kenji Yasuda, Yasushi Niinomi, Yoichi Ohashi, Takahito Okuda, Shinji Naganawa
PURPOSE: Gadobutrol is a gadolinium-based contrast material (GBCM) with a high concentration of gadolinium and high relaxivity. Our purpose was to evaluate the signal intensity profiles in brain tissue for the bolus width and degree of signal change after bolus injection using an echo planar dynamic susceptibility contrast (DSC) sequence. We compared gadobutrol to gadoteridol using various injection speeds and saline flush volumes. METHODS: We studied 97 patients who underwent brain MRI...
May 24, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29781369/contralateral-extensive-cerebral-hemorrhagic-venous-infarction-caused-by-retrograde-venous-reflux-into-the-opposite-basal-vein-of-rosenthal-in-posttraumatic-carotid-cavernous-fistula-a-case-report-and-literature-review
#10
Prasert Iampreechakul, Adisak Tanpun, Punjama Lertbusayanukul, Somkiet Siriwimonmas
We describe a patient with traumatic carotid-cavernous fistula (CCF), subsequently developing contralateral extensive hemorrhagic venous infarction from retrograde venous reflux into the opposite basal vein of Rosenthal. A 54-year-old woman was involved in a motor vehicle accident and sustained severe traumatic brain injury. Two months later, she developed bilateral proptosis and audible bruit. Magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) of the brain demonstrated the right direct CCF...
January 1, 2018: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29776601/echo-intensity-versus-muscle-function-correlations-in-older-adults-are-influenced-by-subcutaneous-fat-thickness
#11
Matt S Stock, Morgan Whitson, Adam M Burton, Nicole T Dawson, Eric J Sobolewski, Brennan J Thompson
Recently, an equation that allows investigators to correct echo intensity for subcutaneous fat was developed. We evaluated correlations between uncorrected and corrected echo intensity versus measures of lower-extremity function. Twenty-three older adults (11 men, 12 women; mean age = 72 y) participated. B-Mode ultrasonography was used to quantify rectus femoris echo intensity and subcutaneous fat thickness. Knee extensor isometric peak torque and rate of torque development at 200 ms (RTD200) were determined (joint angle = 90°)...
May 15, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29773892/metabolite-cycled-density-weighted-concentric-rings-k-space-trajectory-dw-crt-enables-high-resolution-1-h-magnetic-resonance-spectroscopic-imaging-at-3-tesla
#12
Adam Steel, Mark Chiew, Peter Jezzard, Natalie L Voets, Puneet Plaha, Michael Albert Thomas, Charlotte J Stagg, Uzay E Emir
Magnetic resonance spectroscopic imaging (MRSI) is a promising technique in both experimental and clinical settings. However, to date, MRSI has been hampered by prohibitively long acquisition times and artifacts caused by subject motion and hardware-related frequency drift. In the present study, we demonstrate that density weighted concentric ring trajectory (DW-CRT) k-space sampling in combination with semi-LASER excitation and metabolite-cycling enables high-resolution MRSI data to be rapidly acquired at 3 Tesla...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29772066/3d-specific-absorption-rate-estimation-from-high-intensity-focused-ultrasound-sonications-using-the-green-s-function-heat-kernel
#13
Nicholas J Freeman, Henrik Odéen, Dennis L Parker
PURPOSE: Evaluate a numerical inverse Green's function method of deriving specific absorption rates (SARs) from high intensity focused ultrasound (HIFU) sonications given tissue parameters (thermal conductivity, specific heat capacity, and mass density) and 3-D magnetic resonance imaging (MRI) temperature measurements. METHODS: SAR estimates were evaluated using simulations and MR temperature measurements from HIFU sonications. For simulations, a "true" SAR was calculated using the hybrid angular spectrum method for ultrasound simulations...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#14
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29769221/size-reduced-embryos-reveal-a-gradient-scaling-based-mechanism-for-zebrafish-somite-formation
#15
Kana Ishimatsu, Tom W Hiscock, Zach M Collins, Dini Wahyu Kartika Sari, Kenny Lischer, David L Richmond, Yasumasa Bessho, Takaaki Matsui, Sean G Megason
Little is known about how the sizes of animal tissues are controlled. A prominent example is somite size which varies widely both within an individual and across species. Despite intense study of the segmentation clock governing the timing of somite generation, how it relates to somite size is poorly understood. Here we examine somite scaling and find that somite size at specification scales with the length of the presomitic mesoderm (PSM) despite considerable variation in PSM length across developmental stages and in surgically size-reduced embryos...
May 16, 2018: Development
https://www.readbyqxmd.com/read/29767297/magnetic-resonance-assessment-of-fetal-lung-maturity-comparison-between-signal-intensity-and-volume-measurement
#16
Ryo Ogawa, Tomoyuki Kido, Masashi Nakamura, Teruhito Kido, Teruhito Mochizuki, Takashi Sugiyama
PURPOSE: We evaluated the associations between gestational age (GA) and lung-to-liver signal intensity ratio (LLSIR) and fetal lung volume (FLV) using magnetic resonance imaging (MRI). Moreover, we evaluated the reproducibility of these measurements. MATERIALS AND METHODS: LLSIR and FLV were measured using single-shot fast spin-echo MRI in 88 consecutive fetuses. The Spearman test was used to assess the relationships between (1) LLSIR and GA, and (2) FLV and GA in 81 fetuses without lung abnormalities...
May 16, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29729437/influence-of-k-space-trajectory-corrections-on-proton-density-mapping-with-ultrashort-echo-time-imaging-application-for-imaging-of-short-t2-components-in-white-matter
#17
Peter Latta, Zenon Starčuk, Marco L H Gruwel, Barbora Lattova, Petra Lattova, Pavel Štourač, Boguslaw Tomanek
PURPOSE: To evaluate the impact of MR gradient system imperfections and limitations for the quantitative mapping of short T2* signals performed by ultrashort echo time (UTE) acquisition approach. MATERIALS AND METHODS: The measurement of short T2* signals from a phantom and a healthy volunteer study (8 subjects of average age 28 ± 4 years) were performed on a 3T scanner. The characteristics of the gradient system were obtained using calibration method performed directly on the measured subject or phantom...
May 2, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29727401/signal-changes-in-the-dentate-nucleus-and-globus-pallidus-on-unenhanced-t1-weighted-magnetic-resonance-images-after-intrathecal-administration-of-macrocyclic-gadolinium-contrast-agent
#18
Kerem Ozturk, Omer Fatih Nas, Esra Soylu, Bahattin Hakyemez
OBJECTIVES: The aim of this study was to evaluate signal changes in the dentate nucleus and globus pallidus (GP) on unenhanced T1-weighted magnetic resonance (MR) images (T1 WI) in a cohort of patients who have received intrathecal macrocyclic ionic gadolinium-based contrast agent (GBCA) gadoterate meglumine. MATERIALS AND METHODS: A group of 20 patients (male/female ratio, 8:12; mean age, 39.5 ± 15.5 years) who had not received intravenous GBCA but had received an intrathecal macrocyclic ionic GBCA (plus baseline and an additional final magnetic resonance imaging [MRI] for reference) from 2012 to 2017 were retrospectively included in this institutional review board-approved study...
April 30, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29718695/a-quantitative-experimental-phantom-study-on-mri-image-uniformity
#19
Doaa Felemban, Rinus G Verdonschot, Yuri Iwamoto, Yuka Uchiyama, Naoya Kakimoto, Sven Kreiborg, Shumei Murakami
PURPOSE: Our goal was to assess MR image uniformity by investigating aspects influencing said uniformity via a method laid out by the National Electrical Manufacturers Association (NEMA). METHODS: Six metallic materials embedded in a glass phantom were scanned (i.e., Au, Ag, Al, Au-Ag-Pd alloy, Ti and Co-Cr alloy) as well as a reference image. Sequences included Spin Echo (SE) and gradient echo (GRE) scanned in three planes (i.e., Axial, Coronal, and Sagittal). Moreover, three surface coil types (i...
May 2, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29714255/influence-investigation-on-ranging-performance-for-range-gated-geiger-mode-avalanche-photodiode-ladar
#20
Xin Zhou, Jianfeng Sun, Peng Jiang, Di Liu, Qi Wang
The ranging performance for Geiger-mode avalanche photodiode (Gm-APD) laser detection and ranging (ladar) is mainly evaluated by range accuracy and precision; although Gm-APD ladar can evaluate the ranging performance of the exact position, it is not helpful to comprehensively evaluate the influence on the ranging of each parameter in the whole gate. Due to the target echo's stochastic trigger making the delay adjustment inaccurate, the position of the echo in the gate is stochastic in the actual detection process, so the theoretical calculation may not be able to make ladar ranging performance clear...
April 1, 2018: Applied Optics
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