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 9 of 9 for “"Ultrasound Tomography"”.
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Design of a single element 3D ultrasound scanner
… previously theorized scanning methods such as ultrasound tomography can now be realized. This thesis presents the design, error analysis, and initial image reconstructions from a single element 3D ultrasound tomography system. The system enables volumetric pulse echo or transmission imaging of …
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Frequency Domain Ultrasound Waveform Tomography Breast Imaging
<p>Ultrasound tomography is an emerging modality for imaging breast tissue for the detection of disease. Using the principles of full waveform inversion, high-resolution quantitative sound speed and attenuation maps of the breast can be created. In this thesis, we introduce some basic principles of …
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Innovative Acoustic Reflection Imaging Techniques And Application To Clinical Breast Tomography
<p>Conventional ultrasound techniques use beam-formed, constant sound speed ray models for fast image reconstruction. However, these techniques are inadequate for the emerging new field of ultrasound tomography (UST). We present a new technique for reconstruction of reflection images from UST data. …
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The Role Of Tissue Sound Speed As A Surrogate Marker Of Breast Density
… including the use of ionizing radiation. Ultrasound tomography (UST) does not use ionizing radiation and can create tomographic breast sound speed images. These sound speed images are useful because breast density is proportional to sound speed. The purpose of this work was to assess the …
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Advanced Array Imaging for Breast and Prostate Sonography
… Thesis “Introduction.”] In conventional medical ultrasound such as B-mode imaging, the amplitude of the backscattered ultrasound pulse is used to image tissues along a fixed beam direction [1]. This imaging technique works best in static organs, and it is difficult to image moving organs like the …
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Three-dimensional image reconstruction in breast ultrasound computed tomography
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Non-contact quantitative imaging of limbs, bone and tissue, using ultrasound tomographic techniques
Non-contact and quantitative ultrasound images of bone and soft tissue are produced from original algorithms applied to observational data sets collected on two custom built ultrasound imaging systems for limb imaging. The images are quantitative in that the distribution of sound speeds and …
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Image Reconstruction of the Speed of Sound and Initial Pressure Distributions in Ultrasound Computed Tomography and Photoacoustic Computed Tomography
<p>Ultrasound computed tomography (USCT) and photoacoustic computed tomography (PACT) are two emerging imaging modalities that have a wide range of potential applications from pre-clinical small animal imaging to cancer screening in human subjects. USCT is typically employed to measure acoustic …
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Reconstruction of spatially varying sound speed distributions from pulse-echo data
… speed distributions. Historically, sound speed tomography has typically been performed in transmission-mode, which requires specialized hardware configurations and is limited to acoustically transparent tissue such as the female breast. For this reason, integration of sound speed tomography in …