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.
Results
Showing 1 to 11 of 11 for “"diffraction tomography"”.
-
Experimental transport of intensity diffraction tomography
… tomographic principles. Then, I use an Intensity Diffraction Tomography (IDT) approach to improve the quality of reconstruction by accounting for diffraction effects under 1st order Rytov Approximation. I improve both approaches by applying compressive sensing techniques to estimate missing points …
-
Structure Solution Using Precession Electron Diffraction and Diffraction Tomography
This thesis concerns the application of electron diffraction to the problem of structure solution. The technique of precession electron diffraction, in particular, is discussed as a method to improve the applicability of methods borrowed from X-ray crystallography to intensities measured from …
-
Quantitative phase imaging: advances to 3D imaging and applications to neuroscience
… quantitative imaging method, called white-light diffraction tomography (WDT), has been shown. Lastly, an initial result for another advance in SLIM is introduced by combining SLIM with a programmable illumination. In the first part of this work, the emergent self-organization of a neuronal …
-
Advanced Array Imaging for Breast and Prostate Sonography
… For better image resolution, ultrasound tomography systems were developed in which ultrasound data were acquired by transducers placed in a circle around the object [2]. This task of deriving the structure of the object from scattered radiation is known as the inverse scattering problem. …
-
Fast methods for inverse wave scattering problems
… in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor quality control. Efficient algorithms exist for some inverse wave scattering problems in the low- and …
-
Interferometric light microscopy for wafer defect inspection and three-dimensional object reconstruction
… microcopy, called epi-illumination diffraction phase microscopy (epi-DPM), to measure both the phase and amplitude of the scattered field from the wafer. To detect deep sub-wavelength defects, we further reduced the noise in the images by developing an image post-processing method, …
-
Generation of high resolution tomographic images for NDT applications
… been implemented in this work are Reflection tomography, Time-of-flight Diffraction tomography and Transmission tomography. In addition a Single Bounce Image Enhancement method has been developed to improve the images. Selection of images used in the fusion process depends on the nature of the …
-
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 …
-
High-resolution 3-D refractive index imaging and Its biological applications
… conditions. This thesis presents 3-D optical diffraction tomography (ODT) to retrieve the 3-D refractive index map of a transparent biological sample and applies them to some interesting biological problems: the study of cell growth and monitoring the effect of drugs on multiple myeloma cells. …
-
Single-shot quantitative interferometric microscopy for imaging high-speed dynamics
… time. Finally, deep-learning single-shot optical diffraction tomography (DS-ODT), is proposed that fully exploits the potential of off-axis interferometric microscope, to push the imaging speed of 3D cell imaging. By illuminating the cell with four angles simultaneously, 3 and using innovative …
-
Inverse Scattering Image Quality with Noisy Forward Data
Image quality metrics for several inverse scattering methods and algorithms are presented. Analytical estimates and numerical simulations provide a basis for poor image quality diagnostics. The limitations and noise behavior of reconstructed images are explored analytically and empirically using a …