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 20 of 357 for “"Imaging technique"”.
-
Null subtraction imaging technique for biomedical ultrasound imaging
In ultrasonic imaging, reduction of lateral sidelobes results in an improved image with less distortion and fewer artifacts. In general, apodization is used to lower sidelobes in exchange for increasing the width of the mainlobe and thus decreasing lateral resolution. Null subtraction imaging (NSI) …
-
C-ARM TOMOGRAPHIC IMAGING TECHNIQUE FOR DETECTION OF KIDNEY STONES
… painful disorders of the urinary system. Various imaging modalities are used to diagnose patients with symptoms of renal or urinary tract disease such as plain kidney, ureter, bladder x-ray (KUB), intravenous pyelography (IVP), and computed tomography (CT). As a traditional three-dimensional (3D) …
-
Digital Microradiography: In Vitro Validation of a Novel Imaging Technique
… spectroscopic plates and prolonged imaging and processing times. The present study aimed at developing and validating a novel digital microradiographic technique that is not restricted by the limitations of conventional microradiography. Reproducibility of digital microradiography …
-
Grey matter morphological changes in late life using magnetic resonance imaging technique
… neuronal projections. Structural neuroimaging studies have shown reduced volumes of both structures in mild cognitive impairment (MCI); however, of interest is the understanding of how the two structures work together to influence the diagnosis of MCI and its two subtypes. The results …
-
TRU-ART: A cost-effective prototypical neutron imaging technique for transuranic waste certification systems
… package. An assay instrument that employs a new technique (TRU-ART), which can identify the location of the radioactive material within a waste package, was designed, fabricated, and tested to potentially enhance the certification of problem defense waste drums. In addition, the assay …
-
Design, fabrication and testing of a fiber optic stress/strain sensor for soft stretchable materials using polarization imaging technique
The polarization imaging technique has been used to obtain high quality surface images of turbid media. This technique can be slightly modified and used for noninvasive sensing of strain and stress in soft stretchable materials, such as latex and human tissues. Previously this sensing method was …
-
Detection of cervical and thoracic multiple sclerosis lesions of the spinal cord using a 3D phase-sensitive inversion recovery (PSIR) magnetic resonance imaging technique at 1.5T
… T1-weighted TSE sequences. 3D T1-weighted PSIR imaging showed higher lesion detection rates than 2D T2-weighted TSE and 2D T2-weighted STIR, echoing previously reported findings at 3T.
-
Digital holographic imaging of microorganisms
Imaging aquatic microorganisms in 3D space is of interest to biologists and ocean scientists seeking to understand the behavior of these organisms in their natural environments. In this research, digital holographic imaging (DHI), with a 4f system providing transverse magnification of 9.1, is used …
-
Infrared imaging: a proposed validation technique for computational fluid dynamics codes used in STOVL applications
The need for a validation technique for computational fluid dynamics (CFD) codes in STOVL applications has led to research efforts to apply infrared thermal imaging techniques to visualize gaseous flow fields. Specifically, a heated, free-jet test facility was constructed. The gaseous flow field of …
-
Modeling torso imaging via time-domain diffuse correlation spectroscopy
Medical imaging is vital to the timely diagnosis of internal hemorrhaging and the prevention of fatalities. This thesis aims to contribute to this field by examining the efficacy of time-domain diffuse correlation spectroscopy (TD-DCS) as a means of imaging bleeding within the torso. TD-DCS is a …
-
Photoelectrochemical imaging of gold nanoparticles by light-activated electrochemistry
… Herein, LAE was expanded to an electrochemical imaging technique. In the original work published for LAE and the follow-up studies, the Si electrode was modified and investigated with redox species, such as ferrocene or anthraquinone, attached to a monolayer modified electrode, which limits the …
-
Trace gas imaging in the atmosphere with a Fabry-Pérot interferometer - a case study for sulfur dioxide
Atmospheric trace gas imaging allows the direct assessment of chemical dynamics, transport and mixing processes and is therefore desired in atmospheric physics and chemistry. For instance, the application of imaging measurements at trace gas point sources can substantially improve the determination …
-
Fabrication, design, and analytical applications of nanostructured plasmonic crystals
… form of chemical/biological sensing and imaging or for field-enhanced applications of electronics and photovoltaics. Soft nanoimprint lithography provides inexpensive and versatile replication method to generate uniformly ordered and defined nanostructures over large areas. Plasmonic …
-
Non-line-of-sight imaging using multi-bounce light
Non-line-of-sight (NLOS) imaging techniques produce images from light that has travelled from the scene of interest to the observer via indirect paths which typically include multiple reflections. Such techniques can be particularly useful when the direct line of sight between the observer and the …
-
Digital ear scanner : measuring the compliance of the ear
… aid can be greatly improved. Current optical techniques for 3-D imaging are too expensive to be implemented in the ear canal for the purpose of custom fitted hearing aids. A new absorption based optical technique is introduced, which is capable of generating three dimensional maps of an ear …
-
Multispectral Imaging Techniques for Monitoring Vegetative Growth and Health
… (Normalized Difference Vegetation index) is an imaging technique for quantifying red edge contrast for the identification of vegetation. This imaging technique relies on reflectance values for radiation with wavelength equal to 680 nm and 830 nm. The imaging systems required to obtain this …
-
Design Of A Dynamic Focusing Microscope Objective For Oct Imaging
… Coherence Tomography (OCT) is a novel optical imaging technique that has assumed significant importance in bio-medical imaging in the last two decades because it is non-invasive and provides accurate, high resolution images of three dimensional cross-sections of body tissue, exceeding the …
-
Mechanical design of an ultrasonic tomographic imaging system
… design and fabrication of a prototype for limb imaging aimed at tackling several of the issues. The design of the a US probe positioning system is intended to augment a system for motion measurement as well as a framework for the integration of motion and US data. The design of the imaging …
-
Acoustic waves in crystals: I. Ultrasonic flux imaging and internal diffraction. II. Imaging phonons in superconducting niobium
Acoustic wave propagation is studied via imaging techniques in two regimes not previously amenable to such experiments. (I) The low-temperature phonon-imaging technique is extended to ultrasonic frequencies at room temperatures where it is used to study the anisotropic propagation of acoustic waves …
Page 1 of 18