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 164 for “"CT scans"”.
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Multi-atlas segmentation in head and neck CT scans
… automating the task of segmenting structures in head and neck CT scans, to minimize time spent on manual contouring of structures of interest. We focus on the brainstem and left and right parotids. To generate contours for an unlabeled image, we employ an atlas of labeled training …
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A 3D Deep Learning Architecture for Denoising Low-Dose CT Scans
… image quality of low-dose computed tomography (LDCT) scans. Although LDCT scans are advantageous for reducing radiation exposure, they inherently suffer from reduced image quality. Our novel 3D DL architecture addresses this issue by effectively enhancing LDCT images to achieve parity with the …
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Measurement and Applicants of Incidental Coronary Calcium on Chest CT Scans
… general metadata -- e.g., title, author, abstract, subject headings, etc. -- is publicly available, but access to the submitted files is restricted to UT Southwestern campus access and/or authorized UT Southwestern users.
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Registration of pre-operative lung cancer PET/CT scans with post-operative histopathology images
… Tomography (PET) or Computed Tomography (CT), currently provide insuffcient information about the cellular make-up of the lesion microenvironment, unless they are compared against the gold standard of histopathology.The aim of this retrospective study was to build a robust imaging …
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A prospective study: Investigating the use of oncologist-read CT scans in the investigation of suspected malignant spinal cord compression
… There are no data comparing MRI with multi-detector CT scan, a more accessible resource, for the diagnosis of this condition. Objectives: To investigate whether CT scans assessed by radiation oncologists should be used to diagnose and manage spinal cord compression in patients with advanced …
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Automated determination of the theoretical range of hip motion prior to total hip arthroplasty using 3D models created from pelvic CT scans
… of the replaced acetabulum due to a leverage effect. It affects about 4,000 patients a year in the UK, for 80,000 THA1. To prevent this complication, surgeons would benefit from estimating the range of angular hip motion that can be achieved by their patient without impingement between the femur …
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Sex and ancestry estimation using computed tomography: a comparison of the reliability of digital versus physical data collection
… the purpose of convenience, computed tomography (CT) scans are increasingly used in place of skulls in research and forensic casework. Researchers work under the assumption that the dry skull-to-CT scan ratio is one-to-one; however, research on the accuracy of CT scans is sparse. In this study, …
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The diagnostic yield of computerised tomography in human immunodeficiency virus (HIV) positive psychiatric patients at a tertiary hospital in the Western Cape
Background. HIV infection increases the risk for mental illness. Neuroimaging is an important part of the diagnostic workup in HIV+ psychiatric patients; CT is the primary neuroimaging modality available in resource limited settings. Despite advances in neuroimaging no clear guidelines exist for …
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Implementation,Validation and Application of an Automated Motion Correction Algorithm in Hepatic Perfusion CT for Image-Guided Radiotherapy
Functional imaging holds promise in guiding, evaluating and predicting efficacy of cancer treatment. Perfusion imaging provides high resolution functional information generated by applying a model to a dynamic series of contrast enhanced anatomical images. The objectives of this thesis are: 1) to …
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Real-Time Computed Tomography-based Medical Diagnosis Using Deep Learning
… cancer risk is associated with high X-ray dose CT scans, limiting its applicability in medical diagnosis and telemedicine applications. CT scans acquired at low X-ray dose generate low-quality images with noise and streaking artifacts. Therefore we develop a deep learning-based CT image …
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Changes in morphology during the development of the horn and hump of the Chinese cavefish sinocyclocheillus furcodorsalis
… are cave-adapted. Cave Sinocyclocheilus are characterized not only by lack of pigmentation and eyes depending on the species, but also by a unique prominent horn on the top of the skull and dorsal hump rostral under the dorsal fin. The horn and the hump are generally considered troglomorphic …
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Unsupervised discovery of emphysema subtypes in a large clinical cohort
… is one of the hallmarks of Chronic Obstructive Pulmonary Disease (COPD), a devastating lung disease often caused by smoking. Emphysema appears on Computed Tomography (CT) scans as a variety of textures that correlate with the disease subtypes. It has been shown that the disease subtypes …
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Evaluating the yield of brain CT examinations in patients presenting with first onset seizures at the Groote Schuur Hospital, Cape Town
… Africa routinely request Computed Tomography (CT) brain scans in the work-up of patients presenting with first onset seizures. Objectives: To determine the number and proportion of CT scan examinations with abnormal findings in patients presenting with first onset seizures at the Groote Schuur …
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Significancer of Osteoporosis in Facial Bone Density using the Computed Tomography Scan
… the mid-facial bones as measured by quantitative CT scans between the osteoporosis and control groups, and to evaluate the regions that facial trauma and iatrogenic problem often occurs in the mid face. The 96 patients who underwent both OMU CT scans and Dual-Energy X-ray Absorptiometries at Ajou …
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Lung cancer malignancy predication with recurrent neural networks
… convolutional neural networks (CNNs) to detect and classify nodules in CT scans, with the goal of assisting radiologists diagnose lung cancer. In the past decade, new screening pro- tocols have been enacted that advise high-risk patients to get annual CT screenings to monitor any suspicious …
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A data mining approach for acoustic diagnosis of cardiopulmonary disease
Variations in training and individual doctor's listening skills make diagnosing a patient via stethoscope based auscultation problematic. Doctors have now turned to more advanced devices such as x-rays and computed tomography (CT) scans to make diagnoses. However, recent advances in lung sound …
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Auto-Segmentation In Pancreatic and Liver Radiation Therapy
… dose-escalated regimens, such as stereotactic body radiation therapy (SBRT), are emerging as an important pillar of the management of liver and pancreatic cancer. The success of these treatment modalities hinges upon the precise and standardized segmentation of organs-at-risk and target …
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Combination of CT-based Radiomics Features and Clinical Data for Predicting Tumor Genetic Profile in patients with Intrahepatic Cholangiocarcinoma
… as potential targets for systemic therapies. Objective: This study aims to determine whether radiomic features extracted from contrast-enhanced CT scans can predict iCCA genetic alterations non-invasively. Methods: Consecutive patients diagnosed with mass-forming iCCA between January 2016 and June …
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Performance of microstructural finite element models in predicting the effective modulus of trabecular bone
… bone is made up of an irregular, interconnecting framework of rod- and plate-like struts [1], therefore the mechanical properties of the bone may only be determined through experimental testing or detailed Finite Element modelling. Experimental testing requires a sample to be removed from …
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Comparing a Two-Dimensional and Three-Dimensional Assessment of Unilateral Alveolar Cleft Repairs: A Pilot Project
… and post-operative computed tomography (CT) scans were used to determine the defect volume and reverse-segmentation was used to determine the graft volume. Panoramic reconstructions were produced from the CT scans to determine the alveolar defect height and bone fill height. The Bergland …
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