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 12 of 12 for “"Radiographic images"”.
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Beam characterization at the neutron radiography reactor
… imaging beam directly impacts the quality of radiographic images produced using that beam. Fully characterizing a neutron beam, including determination of the beam's effective length-to-diameter ratio, neutron flux profile, energy spectrum, image quality, and beam divergence, is vital for …
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Detection of crack-like indications in digital radiography by global optimisation of a probabilistic estimation function
… of longitudinal crack-like indications in radiographic images is developed in this work. Conventional local detection techniques give unsatisfactory results for this task due to the low signal to noise ratio (SNR ~ 1) of crack-like indications in radiographic images. The usage of global …
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Effect of Image Sharpening on Radiographic Image Quality
… that capture and processing of the digital radiographic images may contain artifacts that could reduce the diagnostic value of dental radiographs. This phenomenon has been reported through various case reports. However, its effect on radiographic image quality has not been studied. The …
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Fast neutron resonance radiography for element imaging : theory and applications
… of other elements are obtained from fast neutron radiographic images taken at different neutron energies chosen to cover the resonance cross section features of one or more elements. A radiographic image provides the 2-D mapping of the sum of elemental contents (weighted by the attenuation …
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Reconstructing the Atomic Number of Cargo X-ray Images using Dual Energy Radiography
… illicit materials is through dual energy radiographic systems, which enable a rough elemental analysis of cargo contents due to the atomic number dependence of photon attenuation. This work investigates the capabilities and limitations for atomic number discrimination using dual energy MeV …
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Determining the Difference Between Active and Inactive Caries White Spot Lesions Using Sodium Iodide
… 11 molar Sodium Iodide (NaI) solution as a radiographic contrast agent to differentiate between active and inactive caries white spot lesions. The hypothesis is that concentrated NaI solution is likely to penetrate into the tooth structure of active, but not inactive, lesions, thereby …
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The effect of the introduction of picture archive and communication systems (PACS) on patient radiation doses and patient management
… acquires, transmits, and stores radiological images digitally. This thesis investigates the doses which are required to produce radiographic images which are acceptable to radiologists and referring clinicians, and compares these doses with those required for the film/screen systems which they …
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ADVANCED APPLICATIONS OF COSMIC-RAY MUON RADIOGRAPHY
… of fission and chain reactions. By combining the radiographic images created by tracking muons through a target plane with the additional fission neutron and gamma signature, we are able to locate regions that are fissionable from a single side. The following materials were imaged with this …
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Facial fatness as a complicating factor in facial reconstruction
… for the non - linear distortion found between radiographic images and the physical tissues was needed. This was done by imaging cadaver heads and taking measurements from the images and the physical heads. The results demonstrated that measurements taken from LODOX® images are analogous with …
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Bronchial gene expression associated with airway pre-malignancy and lung cancer subtypes
… (i.e., quantitative features derived from radiographic images) could yield a better diagnosis for lung cancer screening. Using clinical variables, molecular signatures, and radiomic imaging features, I built and tested an integrated biomarker to improve discrimination between malignant and …
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3D Reconstruction of Patient Specific Bone Models for Image Guided Orthopaedic Surgery
… currently solely relies on 2D x-ray/fluoroscopic images. This research aims to assist orthopaedic surgeons in all steps of the femur fracture reduction procedure by introducing 3D anatomical visualisation. Studies conducted on femur fracture reduction has confirmed that computer-aided systems can …
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Multiparametric Magnetic Resonance Imaging Artificial Intelligence Pipeline For Oropharyngeal Cancer Radiotherapy Treatment Guidance
… domestic cancers that is rising in incidence. Radiographic images are crucial for assessment of OPC and aid in radiotherapy (RT) treatment. However, RT planning with conventional imaging approaches requires operator-dependent tumor segmentation, which is the primary source of treatment error. …