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 “"Visual grading"”.
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The flexural strength and stiffness of eastern oak pallet shook
… of oak shook, 2) to evaluate the potential of a visual grading system and 3) to investigate the impact of growth and manufacturing defects on the flexural properties of oak pallet shook. Strength, stiffness and selected physical property values were determined and reported. The visual grading …
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Determinación de la capacidad resistente de la madera estructural de gran escuadría y su aplicación en estructuras existentes de madera de conífera
… o forjados. Se ha realizado la clasificación visual con las normas UNE 56544 y DIN 4074. La aplicación estricta de estas normas en estructuras antiguas conduce a un elevado número de rechazos. Por ello, en este trabajo se han utilizado diferentes parámetros de clasificación o grupos de …
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Task-specific observer performance and image quality : direct and indirect relationships in low-dose CT images
… analysis and 3D noise power spectrum (NPS). Visual grading characteristic (VGC) observer performance studies were performed with seven observers using a localisation task, and observer tasks involving visualisation of structures with how well images fulfilled international CT quality …
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Development of a Vascularized Carotid Artery Plaque Phantom for the Investigation of Novel Ultrasound-Based Technologies
… in advanced lesions in the carotid artery can be visualized using contrast-enhanced ultrasound (CEUS) technology, and its accurate quantification could provide a powerful tool for the detection of vulnerable plaque. This project was undertaken to develop a model of vascularized atherosclerotic …
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Development of an image based technique for assessment of colorectal epithelial integrity and function in an ovine model
… increase in permeability on a 3-point visual grading scale as assessed by three graders between untreated (1.19 ± 0.53) and BZK treated (2.55 ± 0.75) tissues. Increased permeability may result in increased susceptibility to infections such as HIV. Chapter 3 expands on the permeability …
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Reversible and imperceptible watermarking approach for ensuring the integrity and authenticity of brain MR images
… current state-of-art techniques in terms of visual image quality of watermarked images. This was also evaluated through conducting a novel visual assessment based on relative Visual Grading Analysis (relative VGA) to define a perceptual threshold in which modifications become noticeable to …
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In Vitro Evaluation of Cancer Patient Immune Responses Following Infusion of Radiolabeled Murine Monoclonal Antibody
… IL-2R expression using either flow cytometry and visual grading of fluorescence and the data obtained when murine MAb was used as the stimulating agent. These results suggest that it may be possible to predict before and early after murine MAb infusion the intensity of the reaction against the …
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Optimisation of radiation dose and image quality for AP pelvis radiographic examination
… the first part of this thesis a visual grading image quality assessment scale is developed and validated in order to assess radiographic image quality. The scale validation is conducted in two phases; the initial phase uses phantom images and is further tested in phase two with …
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A comparative study evaluating the performance of diagnostic radiography units and protocols for paediatric and adult chest radiography examinations
… using CDRAD 2.0 phantom, for evaluating visual IQ, simulated lesion visibility (LV) and CXR optimisation studies, was investigated. This was done by determining the correlation between the LCD detectability and visual measures of IQ and LV for two lesions with different locations and …
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A comparison of fixed tube current (FTC) and automatic tube current modulation (ATCM) CT methods for abdominal scanning : implications on radiation dose and image quality
… using SNR (five abdominal organs) and a relative visual grading analysis (VGA) method (five different axial images). Image quality evaluation was performed by the researcher after testing agreement between against five different observers. RESULTS: There were no significant differences in the mean …
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Establishing an evidence-base for erect pelvis radiography : positioning, radiation dose and image quality
… 15cm. Image quality was evaluated physically and visually. The effective dose was calculated using Monte Carlo simulation software (PCXMC). During experiment #2, the anterior thicknesses for 109 patients, with a range of BMIs, who were referred for pelvis radiography, was measured in the erect and …
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Biocompatibility and Bioactivity of Calcium Silicate-based Dental Bioceramics
… tricalcium silicate-based materials:<br/><br/>1)Visual observations of cell<br/>2) Cell viability assays<br/>3)Immunocytochemistry<br/>4)Protein Biochemistry<br/>5)mRNA expression analysis<br/><br/>Visual observations demonstrated differing changes in cellular morphology between our two main test …