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 67 for “"contrast enhancement"”.
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Analysis of Contrast Enhancement Methods for Infrared Images
<p>Contrast enhancement techniques are used widely to improve the visual quality of images. The difference in luminance reflected from two adjacent surfaces creates contrast between the surfaces in the image. The greater the contrast, the easier it is to recognize and differentiate objects in an …
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Contrast enhancement of ultrasound images using shunting inhibitory cellular neural networks
… we begin by reviewing a number of traditional enhancement techniques and measures. Since the entire work of this thesis is based upon a particular model of the CNN, we present a brief review of CNN theory and its applications. The SICNN biological inspiration, derivation and stability issues …
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Using a voxel-based krogh cylinder array to simulate microvascular contrast enhancement
… simulate microscopic and voxel-based dynamic contrast enhancement in magnetic resonance imaging. Specifically, errors imposed by the traditional two-compartment model are reduced by introducing a novel Krogh cylinder network. The two-compartment model was developed for macroscopic …
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Perfusion imaging using power doppler ultrasound without contrast enhancement to diagnose peripheral artery disease
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Perfusion imaging using power doppler ultrasound without contrast enhancement to diagnose peripheral artery disease
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Exploring the visual pathway and its applications to image reconstruction, contrast enhancement and object recognition
… on the subjects of image reconstruction, contrast enhancement and object recognition. The first half of this thesis takes an exploratory approach, on the example of image reconstruction, towards the understanding of the visual pathway from retina to the primary visual cortex (V1), …
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Exploring the visual pathway and its applications to image reconstruction, contrast enhancement and object recognition
… on the subjects of image reconstruction, contrast enhancement and object recognition. The first half of this thesis takes an exploratory approach, on the example of image reconstruction, towards the understanding of the visual pathway from retina to the primary visual cortex (V1), …
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Salty development of an optical photoresist
… developer and observe the effect on photoresist contrast. In order to measure contrast, we designed an anti-reflection coating stack to reduce reflections between the photomask and the photoresist. After development, we observe that for 400 nm exposures of photoresist PS4 that there is no …
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Modeling and Optimization of Individualized Liver Contrast-enhanced CT Imaging
… the United States involves the use of iodinated contrast materials. The use of such contrast agents in CT imaging enhances tissue contrast, particularly in soft tissue organs such as the liver, pancreas, spleen, and kidneys, and thus improves the depiction of a variety of disorders. Despite the …
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Towards image registration of dynamic contrast enhanced MRI using deep learning
Dynamic contrast enhanced (DCE)-MRI is a quantitative imaging technique used to monitor microvascular perfusion. It involves rapidly acquiring multiple T1-weighted images over a few minutes whilst injecting a contrast agent, which causes a rapid increase in image intensity. Each type of tissue …
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Investigation of a Potential Macromolecular MRI Contrast Agent Prepared From PPI (G = 2, Polypropyleneimine, Generation 2) Dendrimer Bifunctional Chelates
… imaging of this complex resulted in a 52% contrast enhancement in the rat kidney following the agents' administration in vivo.
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Catheter for endoscopic magnetomotive optical coherence tomography
… a novel technique which uses targeted magnetic contrast agents for contrast enhancement of OCT imaging. In MM-OCT, microspheres and magnetic nanoparticles (MNPs) are introduced into tissue and an electromagnet is used to generate a small modulated magnetic field within the tissue during OCT …
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Alignment of contrast enhanced medical images
… of medical images in which there are multiple contrast variations is difficult. The reason for this is that the popularmeasures of image similarity used to drive the alignment procedure do not separate the influence of intensity variation due to image feature motion and intensity variation due …
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Ultrasound tissue perfusion imaging
… using standard methods without the expense of contrast enhancement. Additionally, imaging requires high sensitivity to slow, disorganized blood-flow patterns while simultaneously rejecting clutter and noise. An approach to address these challenges involves arranging acquisition data in a …
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Physicochemical characterization of PEG-based comb-like amphiphilic copolymer structures for possible imaging and therapeutic applications
… state that can serve as carriers and potentially contrast enhancement agent in magnetic resonance imaging (MRI). To successfully develop and implement such a delivery/contrast agent system, an adequate understanding is needed concerning their physicochemical properties: stability, size, …
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Investigation of Offset Analgesia during Acute Central Sensitization, Opioid Administration and Complex Regional Pain Syndrome
… intensity, and it is thought to represent contrast enhancement mechanisms that sharpen awareness of decreases in noxious stimuli. Since offset analgesia may represent temporal contrast enhancement that normally occurs in healthy states, the investigation of mechanisms supporting offset …
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Development of Gold-Magnetite Hybrid Nanoparticles for Advanced Radiotherapy
… to exert a dual function: (i) to provide contrast enhancement in magnetic resonance imaging (MRI).and (ii) to enhance radiation effects in the cancer. The imaging and the radiosensitization potentialities of H-NPs arise from the superparamagnetic behaviour of magnetite and the large x-ray …
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The Development of a Novel Tumor -Specific MRI Contrast Agent Targeting the High Affinity Folate Receptor: In Vitro and in Vivo Specificity, Toxicity, and Biodistribution
The need to develop target-specific MRI contrast agents to aid in disease characterization remains highly essential. Here, we present a generation four polyamidoamine (PAMAM) dendrimer conjugated to folic acid that specifically targets the high affinity folate receptor (hFR) overexpressed on more …
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Real time imaging and infrared background scene analysis using the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) System
… with preliminary work on image analysis and contrast enhancement of infrared background scenes.
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Advances in real-time optical scanning holography
… Nonlinear digital processing for fringe contrast enhancement is demonstrated. The use of an intermediate display process has previously been identified as a major drawback in the real-time optical scanning holographic system. A digital frame memory is introduced into the system, …
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