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 29 for “"x-ray image"”.
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Chest X-Ray Image Classification with Deep Learning
… considers one essential task in CAD, the chest X-ray (CXR) image classification problem, with the deep learning technologies from the following three aspects. First, considering most diseases existing in CXRs usually happen in small, localized areas, we propose to localize the local discriminative …
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INFORMATION TRANSFER EFFICIENCY OF X-RAY IMAGE INTENSIFIER-BASED IMAGING SYSTEMS.
… developed and verified experimentally with an x-ray image intensifier (XRII)-based imaging system. In such a system, the DQE at low frequency range is primarily determined by the x-ray detection and scintillation processes at the CsI layer of the XRII. The effects of x-ray photon energy and …
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Shape Matching, Relevance Feedback, and Indexing with Application to Spine X-Ray Image Retrieval
… a collection of 17,000 digitized spine X-ray images obtained from the second National Health and Nutrition Examination Survey (NHANES II). Research effort has been devoted to develop a web-accessible retrieval system that allows retrieval of images from the NHANES II database on relevant …
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Towards improving the Statscan X-ray image quality through sliding mode control of the C-arm
… investigates methods for improving the image quality of a digital radiography system. The Lodox Statscan™ X-ray system provides a full-body scanned image for initial diagnosis. The system is driven by a permanent magnet linear motor (PMLM) controlled by a cascaded …
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CUDA Accelerated X-ray Image Processing for Bone Detection in the Valka X-ray Guided Cutting Machine
The Valka X-ray Guided Cutting Machine is a fish fillet cutting machine which takes an X-Ray image of every fillet fed to the machine via conveyor. The x-Ray is then joined with a 3D image which gives a three dimensional image of the fillet and its bones. The cutting is made with high pressure …
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Distortion Correction in LODOX StatScan X-Ray Images
… of a method of distortion correction in x-ray images produced by the LODOX StatScan machine. The distortion correction of an object's x-ray image is of particular interest in the medical field, particularly for prosthetics, implants, and orthopedic work. It is useful to be able to take …
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Exploring the visualisation of the cervicothoracic junction in lateral spine radiography using high dynamic range techniques
… difficult to visualise in a lateral X-ray image due to the rapid change in the bodys anatomy at the level of the junction, where the shoulders cause a large increase in attenuation. To explore methods of enhancing the appearance of this important area, lateral radiographs of a shoulder …
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A Multiple Sensors Approach to Wood Defect Detection
… modality, e.g., a single optical sensor or an X-ray imaging system. These systems cannot detect all critical defects in wood. This research work reported in this dissertation is the first aimed at creating a vision system utilizes three imaging modalities: a color imaging system, a laser range …
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Simulations for the International X-ray Observatory
The subject of this thesis is the simulation of X-ray cluster surveys and related issues, with a focus on the research that can be conducted with the International X-ray Observatory (IXO), or a similar next-generation X-ray observatory. A general purpose X-ray image simulator has been developed. It …
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A detailed study of the gamma-ray supernova remnant RX J1713.7-3946 with H.E.S.S.
The H.E.S.S. telescope system -- an array of four imaging atmospheric Cherenkov telescopes situated in Namibia -- aims at exploring non-thermal processes in the universe by means of very-high-energy (VHE) gamma rays. Its large field of view combined with unprecedented sensitivity enables detailed …
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Design and applications of cold-cathode X-ray imaging systems
X-ray computed tomography (CT) and planar x-ray imaging are mainstays of modern clinical care. The electron generation mechanism in standard x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed …
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Bone age estimation using machine learning approach: An assessment using hand and wrist bones of South African children
… 400 South African population (SA) left-hand X-ray radiographs (from a LODOX machine) were used from birth to 19 years of age. These radiographs of the two datasets were pre-processed to remove unnecessary labels, remove the background, and straighten the X-ray image. The first experiment used …
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Developing an Automated Explosives Detection Prototype Based on the AS&E 101ZZ System
… development of a multi-sensor, multi-energy x-ray prototype for automated explosives detection. The system is based on the American Science and Engineering model 101ZZ x-ray system. The 101ZZ unit received was an early model and lacked documentation of the many specialized electronic …
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Detection of breast cancer microcalcifications in digitized mammograms. Developing segmentation and classification techniques for the processing of MIAS database mammograms based on the Wavelet Decomposition Transform and Support Vector Machines
… detection and diagnosis systems. It takes an x-ray image of the breast and can provide a second opinion for radiologists. The earlier detection is made, the better treatment works. Digital mammograms are dealt with by Computer Aided Diagnosis (CAD) systems that can detect and analyze …
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Detection of breast cancer microcalcifications in digitized mammograms. Developing segmentation and classification techniques for the processing of MIAS database mammograms based on the Wavelet Decomposition Transform and Support Vector Machines.
… detection and diagnosis systems. It takes an x-ray image of the breast and can provide a second opinion for radiologists. The earlier detection is made, the better treatment works. Digital mammograms are dealt with by Computer Aided Diagnosis (CAD) systems that can detect and analyze …
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Analysis and Measurement of Motion in 2D Medical Imaging Sequences Exploiting Uncertain Knowledge
… of moving and deformable structures in medical image processing has become an increasingly important research field in recent years. Fast and high-resolution image acquisition methods such as Magnetic Resonance (MR) imaging produce very detailed cross-sectional images of the human body. …
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Impact of intrafractional prostate motion on the accuracy and efficiency of prostate cancer treatment on CyberKnife radiotherapy
… which comprises18 SBRT fractions and 1,892 X-ray image registrations. Each image contains real-time prostate motion in 6D. The data were compared against clinically used margins to identify periods of large prostate motion during treatment. Results indicate significant periods of prostate …
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High-bandwidth high-precision robust x-ray microscopy - a control systems approach
… positioning stages of Velociprobe X-ray microscope at Advanced Photon Source (APS) at Argonne National Laboratory (ANL) is presented. In particular, our focus is on maintaining a precise position of the optics scanning stages in the XY lateral plane relative to the sample stages, …
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Investigating temperature distributions and thermal conduction effects in laser-heated plasmas relevant to Magnetized Liner Inertial Fusion
… spatially resolved spectra and monochromatic x-ray emission images were recorded. Individual analysis of the spatially resolved spectra recovered temperature distributions Te(z) that are resolved along the direction of laser propagation but spatially integrated along the instrument's …
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Intelligent X-ray imaging inspection system for the food industry.
… factory. This research presents a generic X-ray imaging inspection system with application for the detection of foreign bodies in a meat product for the food industry. The most important modules in the system are the image processing module and the high-level detection system. This research …
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