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 30 for “"observer variability"”.
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Occupancy and Abundance of Golden-cheeked Warblers (Dendroica chrysoparia) on the Balcones Canyonlands Preserve
… decisions regarding endangered species. Observer variability in detection can be a substantial source of ·error in avian survey methods, resulting in biased population estimates. Additionally, the degree of among-observer variability in detection may be influenced by population density. I …
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Auto-Delineation of Oropharyngeal Clinical Target Volumes Using Deep Learning Techniques
… there are several reports of significant inter-observer variability when delineating these target volumes for head and neck cancers making this variability one of the largest sources of uncertainty in head and neck radiation therapy.</p> <p>The purpose of this study was to develop algorithms to …
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Improving outcome assessment for clinical trials in stroke
… of the scale is potentially limited by inter-observer variability. Using a “mock” clinical trial design I demonstrate that inter-observer mRS variability in contemporary practice is moderate (k=0.57). Adding these data to systematic review of published data, confirms an overall moderate …
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Development of native and contrast enhanced magnetic resonance imaging for the characterization of cardiovascular disease
… found this improved blood suppression and inter-observer variability of scar size measurement and allowed imaging at an earlier time point compared to IR imaging for both ventricular and atrial wall scar.<br/>For ventricular scar, I also found improved expert confidence and inter-observer …
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Electrical impedance measurements of the uterine cervix in pregnancy
… the following has been demonstrated:1. An inter-observer variability in resistivity readings, initially of the order of 20%, but decreasing to 1% once proficiency with the technique was established.2. An intra-observer variability in resistivity readings of less than 15% in 94% of cases using the …
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Baited remote underwater video survey of reef fish in the Stilbaai marine protected area, with an assessment of monitoring requirements
… and cost requirements, whilst eliminating inter-observer variability and increasing statistical power. Species richness and relative abundance were assessed employing BRUV technology in the Stilbaai MPA in the Western Cape, South Africa. ... [The] result corroborated findings from traditional …
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A Comparison of Two Hue Scaling Methods
… categories. The two methods were compared for 29 observers. Settings on both tasks were comparable though the similarity ratings showed weaker categorical bias and less inter-observer variability. The concordance suggests that the functions measured by the two paradigms reflect properties of color …
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Computation of Breast Ptosis from 3D Scans of Torso
… of ptosis involves qualitative visualization by observers which is subject to inter- and intra-observer variability. Alternatively, ptosis can be measured anthropometrically from the patient or from clinical photographs, but these methods are error prone. As stereophotography is now finding its …
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Tumour Localisation in Histopathology Images
… workloads and introducing inter- and intra-observer variability. Automation shows great potential in clinical research to reduce pathologists' workloads and speed up cancer research in large clinical studies. Whilst recent advancements in digital pathology have enabled IHC measurements to be …
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Computational imaging and analysis in breast cancer
… patient care, often exhibit significant inter-observer variability resulting in inconsistent inter- and intra-institutional predictions of tumor behavior (including metastases and/or recurrence), resulting in incorrect diagnoses or treatment. Because cellular morphology is an integrated …
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Evaluation of right ventricular function using conventional and real-time 3-dimensional echocardiography in normal dogs and dogs with myxomatous mitral valve disease
… and analyzed in all dogs. Intra- and inter-observer coefficents of variation were > 20% for all 3D RV indices. Right ventricular EDV and ESV were decreased and RV EF was increased in dogs with advanced MMVD when compared to controls. Several conventional echocardiographic indices of RV …
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Analysis and Measurement of Motion in 2D Medical Imaging Sequences Exploiting Uncertain Knowledge
… High demand on expert time and inter- and intra-observer variability impose a clinical and scientific need of automating this process.<br/><br/>This thesis presents a novel approach for segmenting and tracking of anatomical objects in 2D medical image sequences, which enables quantitative studies …
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Sessile serrated lesions in focus: Examining temporal trends, patient risk factors, and the role of the endoscopist in lesion detection
… serrated lesions by endoscopists, high inter-observer variability in diagnosis by pathologists, and an incomplete understanding of risk of future neoplasia. In this thesis, we analyze over 75,000 screening colonoscopies performed over a five-year period at a dedicated, large volume, …
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A Depth-Guided Annotation Tool for B-Line Quantification in Lung Ultrasound
… and suffer from substantial inter- and intra-observer variability. This variability limits reproducibility, hampers clinical integration, and challenges the development of robust AI models for LUS analysis. This thesis presents the design, implementation, and evaluation of AnnotateUltrasound, …
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Temperament in beef cattle : methods of measurement, consistency and relationship to production
… the added advantage of reducing inter- and intra-observer variability. The positive relationship of subjective scores and MMD values with the steers performance (average daily weight gain) shows not only that a calm temperament is conducive to productivity, but also that objective measures can …
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Breast cancer diagnosis using Fourier transform infrared imaging and statistical learning
… for patient diagnosis. This is prone to inter- observer variability leading to low concordance rates amongst pathologists. Further, since structural features are mostly just defined for epithelial alterations during tumor progression, the use of associated stromal changes is limited. To overcome …
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ARTIFICIAL INTELLIGENCE FOR DETECTION AND QUANTIFICATION OF BREAST ARTERIAL CALCIFICATIONS ON MAMMOGRAMS AS A BIOMARKER OF CARDIOVASCULAR DISEASE
… manual task, vulnerable to intra- and inter-observer variability; also, the considerable diversity of BAC’s appearance and the lack of a standard reporting guideline or a reliable quick quantification method have limited their adoption as a robust imaging biomarker in clinical practices. …
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Integrating contour-coupling with spatio-temporal models in multi-dimensional cardiac image segmentation
… is time-consuming and prone to inter/intra observer variability. Automatic segmentation algorithms are a promising solution to alleviate this issue. Within the model-based segmentation domain, a popular strategy considers the entire segmentation target as a single entity. Although intuitive, …
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The role of image processing and artificial intelligence machine learning-based systems for unbiased evaluation of human coronary atherosclerotic plaque progression and vulnerability, and in response to pharmacotherapy
… core laboratories. Furthermore, inter- and intra-observer variability for particular tissues is suboptimal, even between core laboratories. Analysis is also limited by the high frequency of artifacts, and similarity of artifact to disease. The work presented in this thesis first demonstrates the …
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Development of AI assisted light microscopy system for blood cell analysis and infection detection
… methods, such as manual evaluation and inter-observer variability, this system seeks to provide accurate, efficient, and standardised analysis of blood samples. The integration of AI and light microscopy promises to revolutionise haematological diagnostics, enabling more precise and accessible …
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