Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 70 for “"B-mode"”.
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Risk Factors in using B-mode High-resolution Measurement of Common Carotid
… 전까지는 진단이 쉽지 않다. 혈관의 변화를 조기에 진단하기 위한 선별 검사로 B-mode 초음파를 이용한 경동맥 내막-중막의 두께(Intima-Media Thickness, IMT)의 측정이 좋은 방법으로 알려져 있다. 따라서 본 연구는 2005년 1월부터 2005년 9월까지 A대학병원에서 IMT를 측정한 16∼81세 400명의 내원자를 대상으로 B-mode 초음파를 사용하여 경동맥에서 IMT를 측정하였고, 일반적 특성, 건강행위, 가족력 및 질병력, 임상화학적 특성이 IMT에 영향을 미치는 요인을 파악하고자 하였다. …
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Evaluation of null subtraction imaging and interpolation techniques for ultrasound B-mode
In biomedical ultrasound imaging, many attempts have been made to improve the lateral resolution through various adaptive and non-adaptive techniques. While each technique has its advantages and disadvantages, there are some challenges common to all methods. In particular, improvements in lateral …
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Utilization Of B-Mode Ultrasound As A Body Fat Estimate In Collegiate Football Players
… and the three compartment-water (3C-W) model of Siri (1961), using Bioimpedance spectroscopy (BIS) to estimate total body water (TBW) and air-displacement plethysmography (BODPOD<sup>®</sup>) to determine body density (Db). Pearson’s product-moment correlation analyses were run to …
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Deep learning-based M-mode OCT system and B-mode OCT system diagnosis accuracy comparison
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Measuring the absolute concentration of particles in suspension using high frequency B-mode ultrasound imaging
… particle concentration from high frequency B-mode ultrasound images. The method is based on the detection and characterization of the echoes from individual particles to estimate the effective slice thickness of the image. Prior characterization of the sample is not required because the …
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Detection of muscle damage by B-mode ultrasonography : relationship between echo intensity and histological changes following injection of bupivacaine to rat hind limb muscles
It is reported that the echo intensity of B-mode ultrasound images increases when human elbow flexors are damaged by eccentric exercise. However, it is unknown what causes the increase in echo intensity, and its relationship to histological changes is unexplored. This study tests the hypothesis …
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Utilizing Multitask Transfer Learning for Sonographic Rheumatoid Arthritis Synovitis Grading
… grading of Ultrasound (US) images in Brightness mode (B-Mode) and Power Doppler mode.</p> <p>In the medical community, the lack of reliability of scoring these images has been an issue and reason for concern for doctors and other medical practitioners. The human/machine variability across the …
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Deformation correction in ultrasound imaging in an elastography framework
… to correct tissue deformation in ultrasound B-mode imaging and elastography is developed in the framework of elastography. To characterize the change of tissue deformation with contact force, a force sensor is used to provide contact force measurement. Correlation-based displacement estimation …
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Design and analysis of a quasi-optical beam combiner for the QUBIC CMB interferometer
… to discuss the prospect of observing the CMB B-mode polarization using a novel technique called bolometric interferometry. This was the first meeting of what would later become the QUBIC collaboration. In this thesis we discuss the scientific reasons for CMB observation, we present a detailed …
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Improving ultrasound display by retrieving high-frequency sonographic information
… quality. The axial resolution of ultrasonic B-mode images has been studied by Wagner et al. (1983) and shown to be on the order of the pulse bandwidth. However, a broad pulse bandwidth, which is obtained at high transmission frequency, has limited depth of penetration because of tissue …
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Effect of nicotine and alcohol exposure in utero on vascular intima medial thickness, endothelial function, and the development of cardiometabolic risk factors in children in a low-income setting.
… and arterial diameter using Doppler and B-mode ultrasonography, respectively. Carotid artery IMT was measured using B-mode ultrasonography. All data was analysed using SPSS® software version 30.
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LUMEN SEGMENTATION IN INTRAVASCULAR ULTRASOUND DATA
… IVUS data. The method can be used with either B-mode or RF-data and it is based on the deformation of a curve by optimizing a probabilistic cost function. The main contribution is the development of a physicsbased inverse method for the segmentation of the lumen employing the IVUS RF data as …
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Reconstruction of spatially varying sound speed distributions from pulse-echo data
Traditional ultrasonic brightness mode (B-Mode) images are plagued by poor image quality due to the limited observational coverage. This has motivated research in alternative imaging modes, such as tomographic reconstruction of sound speed distributions. Historically, sound speed tomography has …
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Probes of cosmic inflation: from the CMB to quantum analogues
… first part of the thesis focuses on parity-odd B-mode polarization patterns, which are a distinctive imprint of primordial gravitational waves (PGW) on large scales. The Simons Observatory (SO), a new ground-based CMB experiment, is targeting these B-modes with unprecedented sensitivity. Realizing …
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Real-time beam visualization and therapy planning for focused ultrasound therapies using a diagnostic imaging array
… was then overlaid onto a co-aligned B-mode image captured using the same imaging array to provide anatomical context. To correct for the scattering profile of the medium, the echogenicity of the B-mode image was used to normalize the intensity field reconstruction, allowing for robust …
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Comparative imaging of the canine acute abdomen: survey radiography, contrast-enhanced ultrasound and contrast-enhanced multi-detector helical computed tomography
… agreement between survey radiography, combined B-Mode/CEUS, and CE-MDCT in the same population of canine patients; particularly the ability of these modalities to differentiate surgical from non-surgical conditions. Nineteen dogs (18 from phase 1 plus one additional case) with acute abdominal …
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First-order statistical speckle models improve robustness and reproducibility of contrast-enhanced ultrasound perfusion estimates
… of tracer concentration in indicator-dilution modeling. This discounts additional information that may be available from the first-order speckle statistics in a CEUS image. Heterogeneous vascular networks, typical of tumor-induced angiogenesis, lead to heterogeneous contrast enhancement of the …
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Ultrasound-based Noninvasive Monitoring Methods for Neurocritical Care
… (ICC), and cerebrovascular resistance (CVR) in a model-based, noninvasive, patient-specific, and interpretable fashion. High frequencies (4-6 MHz) were used for extracranial insonation. Vessel diameters were estimated with B-mode images and were combined with color flow derived velocity …
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Cosmological And Astrophysical Tests Of Modified Gravity
… The cosmological perturbation theory of this model is studied and the predictions on temperature fluctuations of the cmb are found. The second one is drgt massive gravity. In this theory a charged black hole solution is found and compared to those in gr, folloby constraints on the parameter …
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Effects of Mechanical Damage on Patellar Tendon Ultrasound Texture Parameters
… relaxation (in slack) periods in between. B-mode and Shear Wave Elastography (SWE) images were collected in a preloaded, unstrained state prior to each strain hold and following the final strain hold. Images were also collected at the peak stress, midpoint (t=15 minutes), and equilibrium …
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