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 8 of 8 for “"4D imaging"”.
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Understanding the Organization, Location, and Interactions of Actin-based Structures During Drosophila Dorsal Closure
… and dynamic medioapical arrays. I used live, 4D imaging to observe Drosophila dorsal closure, a model of epithelial sheet morphogenesis. I compared four fluorescently tagged F-actin probes widely used by Drosophila researchers to determine which was optimal for imaging dorsal closure. I …
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Four-Dimensional Imaging of Respiratory Motion in the Radiotherapy Treatment Room Using a Gantry Mounted Flat Panel Imaging Device
<p>Imaging respiratory induced tumor motion in the radiation therapy treatment room could eliminate the necessity for large motion encompassing margins that result in excessive irradiation of healthy tissues. Currently available image guidance technologies are ill-suited for this task. …
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Improvements In Four-Dimensional and Dual Energy Computed to mography
<p>Dual energy and 4D computed tomography (CT) seek to address some of the limitations in traditional CT imaging. Dual energy CT, among other purposes, allows for the quantification and improved visualization of contrast materials, and 4D CT is often used in radiation therapy applications as it …
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Development of Optical Coherence Tomography Systems for Ophthalmic Imaging and Intrasurgical Guidance
… tomography (OCT) is a non-contact volumetric imaging modality that is well suited to image the anterior and posterior human eye in vivo. The success of OCT in clinical ophthalmology motivated the development of intraoperative OCT to overcome the limitations of the operating microscope for …
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Quantitative Analysis of the Structural Dynamics of Mitotic Chromosomes in Live Mammalian Cells
… chromatin volume was measured by high resolution 4D imaging; medium scale (~200 nm) by statistical analysis of pixel intensities; and molecular scale (~10 nm) by a FRET reporter of histone tail environment. These measurements show that (i) mitotic compaction may start at least 20 min before …
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Quantitative phase imaging: advances to 3D imaging and applications to neuroscience
… provides a brief overview of quantitative phase imaging (QPI) methods along with applications and advances made on them. First, spatial light interference microscopy (SLIM) is introduced as a QPI method extensively used in this thesis. Using this setup, an application of QPI in neuroscience is …
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Development of Five-dimensional Magnetic Resonance Imaging (5D-MRI) for Radiation Therapy
… In modern radiation therapy, four-dimensional (4D) imaging is the state-of-art technique for imaging respiratory motion of thoracic and abdominal cancers. However, its application for abdominal cancers has been limited due to the low soft-tissue contrast of CT. Recently, a number of 4D magnetic …
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Design and Optimization of Four-Dimensional Cone-Beam Computed to mography In Image-Guided Radiation Therapy
… four-dimensional cone-beam computed tomography (4D-CBCT), which acquires an image set of the dynamic target throughout the respiratory cycle during the therapy session. 4D-CBCT is undersampled if the scan time is too short. However, short scan time is desirable in clinical practice to reduce …