Abstract There is uncertainty regarding the risk posed by magnetic resonance imaging (MRI) examinations to pregnant patients. The most frequently used methods, such as single‐shot fast spin echo (ssFSE), often require operation at specific absorption rate (SAR) limits imposed safety guidelines. With introduction of higher‐field systems, will be even more significant for fetal imaging. An electromagnetic solver based on time domain finite integration technique (FIT) was predict SAR in an...

The structure of microvasculature cannot be resolved using conventional ultrasound (US) imaging due to the fundamental diffraction limit at clinical US frequencies. It is possible overcome this resolution limitation by localizing individual microbubbles through multiple frames and forming a superresolved image, which usually requires seconds minutes acquisition. Over time interval, motion inevitable tissue movement typically combination large- small-scale translation deformation. Therefore,...

Numerical simulations of specific absorption rate (SAR) and temperature changes in a 26-week pregnant woman model within typical birdcage body coils as used 1.5 T 3 MRI scanners are described. Spatial distributions SAR the resulting spatial temporal determined using finite difference time domain method bio-heat transfer solver that accounts for discrete vessels. Heat from foetus to placenta via umbilical vein arteries well across foetal skin/amniotic fluid/uterine wall boundaries is...

Measurement of head biometrics from fetal ultrasonography images is key importance in monitoring the healthy development fetuses. However, accurate measurement relevant anatomical structures subject to large inter-observer variability clinic. To address this issue, an automated method utilizing Fully Convolutional Networks (FCN) proposed determine measurements circumference (HC) and biparietal diameter (BPD). An FCN was trained on approximately 2000 2D ultrasound with annotations provided by...

Landslides are one of the most widespread disasters and threaten people’s lives properties in many areas worldwide. Landslide susceptibility mapping (LSM) plays a crucial role evaluation extenuation risk. To date, large number machine learning approaches have been applied to LSM. Of late, high-level convolutional neural network (CNN) has with intention raising forecast precision The primary contribution research was present model which based on CNN for LSM methodically compare its capability...

Myocardial contrast echocardiography (MCE) is an imaging technique that assesses left ventricle function and myocardial perfusion for the detection of coronary artery diseases. Automatic MCE quantification challenging requires accurate segmentation myocardium from noisy time-varying images. Random forests (RF) have been successfully applied to many medical image tasks. However, pixel-wise RF classifier ignores contextual relationships between label outputs individual pixels. which only...

The interlayer properties of the CRTS III slab track during construction directly affect its long-term service condition. This article introduces time-varying coefficients that characterize early interface between and SCC to improve bilinear CZM. Based on this, an property evolution model is established. mechanism under complex loads influence key parameters them are revealed. results show after pouring, damage at corner becomes a sensitive area due combined effects shrinkage temperature...

Actinobacillus pleuropneumoniae is a major cause of pleuropneumonia, an acute or chronic lung disease pigs that causes significant morbidity, mortality and economic losses in the worldwide pig industry (Bossé others 2002, Gottschalk 2012). There are 15 established serovars bacterium determined by composition capsular polysaccharide (Gottschalk 2012) with another proposed based on serology alone (Sárközi 2015). Determining serovar allows insights into epidemiology A. pleuropneumoniae, for...

The structure of microvasculature cannot be resolved using clinical B-mode or contrast-enhanced ultrasound (CEUS) imaging due to the fundamental diffraction limit. It is possible overcome this resolution limitation by localizing individual microbubbles (MBs) through multiple frames and forming a super-resolved image. However, super-resolution (SR) bring their own unique problems since structures imaged are on order 10s μm. Therefore, motion correction (MC) crucial for SR imaging, where...

High-frame-rate (HFR) ultrasound (US) imaging and contrast-enhanced US (CEUS) are often implemented using multipulse transmissions, to enhance image quality. Multipulse approaches, however, suffer from degradation in the presence of motion, especially when coherent compounding CEUS combined. In this paper, we investigate effect on intensity HFR deep tissue simulations vivo contrast echocardiography (CE). The simulation results show that motion artifact is much higher flow an axial direction...

This work presents the first in-vivo High-frame rate Contrast Enhanced Ultrasound (HFR CEUS) for cardiac application. The acquisition has been made on a sheep. A coherent compounding of diverging waves combined with Pulse Inversion (PI) transmission allow frame 250 per seconds which is 8 times faster than standard CEUS in proposed method improves image contrast compared to and allows better tracking fast movement heart.

This article takes hospitals as the research object and explores relationship between hospital intangible asset management financial development. Through an overview of management, this paper analyzes impact on development, well demand for in also proposes strategies to optimize promote including establishing a sound system, enhancing development utilization ability value, strengthening risk control. aims explore hospitals, order provide useful inspiration reference managers.

Contrast echocardiography (CE) ultrasound with microbubble contrast agents has significantly advanced our capability for assessment of cardiac function, including myocardium perfusion quantification. However, in standard CE techniques obtained line by scanning, the frame rate and image quality are limited. Recent research shown significant frame-rate improvement noncontrast imaging. In this work, we present initially evaluate, both vitro vivo, a high-frame-rate (HFR) imaging system using...

IntroductionClinical evaluation of deep learning (DL) tools is essential to compliment technical accuracy metrics. This study assessed the image quality standard fetal head planes automatically-extracted from three-dimensional (3D) ultrasound volumes using a customised DL-algorithm.MethodsTwo observers retrospectively reviewed against pre-defined criteria. Forty-eight images (29 transventricular, 19 transcerebellar) were selected 91 transabdominal scans (mean gestational age = 26 completed...

The structure of microvasculature cannot be resolved using clinical B-mode or contrast-enhanced ultrasound (CEUS) imaging due to the fundamental diffraction limit at frequencies. It is possible overcome this resolution limitation by localizing individual microbubbles through multiple frames and forming a super-resolved image. However, super-resolution creates its unique problems since structures imaged are on order 10s μm. Tissue movement much larger than 10 μm common in imaging, which can...

For the purpose of satisfying demands polarization-maintaining fibers for fiber optic gyroscopes, this article proposes a semicircular cladding birefringent hollow-core anti-resonant fiber. The influence structural parameters on birefringence, loss, and bending loss is studied. simulation results demonstrate that at 1550 nm, ultimate fundamental mode x y polarization 1.76 dB/m 0.93 dB/m, respectively. birefringence can reach 1 × 10−4, wavelength range greater than 10−4 60 nm. This indicates...

Contrast echocardiography (CE) ultrasound with microbubble contrast agents have significantly advanced our capability in assessing cardiac function, including myocardium perfusion imaging and quantification. However conventional CE techniques line by scanning, the frame rate is limited to tens of frames per second image quality low. Recent research works high frame-rate (HFR) shown significant improvement non-contrast imaging. But a higher rate, coherent compounding HFR images shows some...