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 15 of 15 for “"Lesion detection"”.
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Small lesion detection with resolution enhancement compression: a method of coded excitation/pulse compression
… was examined for its ability to improve lesion detectability. In addition to lesion detectability, the REC technique was examined in the context of being peak voltage limited or peak pressure limited. The REC technique was used to double the –3-dB fractional pulse-echo bandwidth of an …
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Sessile serrated lesions in focus: Examining temporal trends, patient risk factors, and the role of the endoscopist in lesion detection
… an important clinical entity, as these precursor lesions are hypothesized to be responsible for up to 25% of sporadic cases of colorectal cancer. Much confusion exists regarding these polyps; particularly, their classification and associated malignant risk due to varied nomenclature, evolving …
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Assessment of the impact of the application single photon emission computerized tomography and SPECT-CT on lesion catergorization
… the use of a new SPECT-CT in the evaluation of lesions. Methods: The folder number, radiopharmaceutical used and type of scan of patients examined with a new Siemens T6 SPECT-CT between 2 April and 31 December 2013 were retrieved. The number of 99m Tc -MDP bone scans was sufficient for a …
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A Comparison of five radiographic systems to D-speed film in the detection of artificial bone lesions
… and F-speed film to standard D-speed film in the detection of artificial bone lesions prepared in mandible bone sections. Multiple artificial bone lesions were prepared at varying depths in the cortical bone. Specimens were imaged with six different radiographic systems. Radiographs were randomly …
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The impact of simulated motion blur on breast cancer detection performance in full field digital mammography (FFDM)
… is employed in breast screening for the early detection of breast cancer. High quality, artefact free, diagnostic images are crucial to the accuracy of this process. Unwanted motion during the image acquisition phase and subsequent image blurring is an unfortunate occurrence in some FFDM …
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Pre-hoc and Post-hoc Diagnosis and Interpretation of Breast Magnetic Resonance Volumes
… of higher survival rates with earlier tumour detection. Although these programs are normally based on mammography, magnetic resonance imaging (MRI) is recommended for patients at high-risk. The interpretation of such MRI volumes is timeconsuming and prone to inter-observer variability, leading …
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Requirements for the detection of atherosclerosis lesions in carotid arteries with SPECT
Detecting the metabolic state of atherosclerotic lesions is a promise of nuclear medicine imaging. Several researchers are developing radiopharmaceuticals for atherosclerosis imaging. In this thesis, we provided procedural guidelines to detect carotid lesions with single photon ,Emission Computed …
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THRESHOLDING METHODS FOR LESION SEGMENTATION OF BASAL CELL CARCINOMA IN DERMOSCOPY IMAGES
Purpose: Automatic border detection is the first and most crucial step for lesion segmentation and can be very challenging, due to several lesion characteristics. There are many melanoma border-detecting algorithms that perform poorly on dermoscopy images of basal cell carcinoma (BCC), which is the …
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Functional Imaging to enable more accurate localisation and characterisation of prostate tumours
… offers the potential for further improvements in lesion detection and characterisation, with the additional advantages of providing whole gland coverage of the prostate and being non-invasive. This thesis addresses the issues of prostate tumour localisation and characterisation using functional …
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Clinical Utility of Advanced Neuroimaging Techniques in the Presurgical Assessment of Patients with Epilepsy
… imaging for hippocampal/amygdala volumetry and lesion detection, and fMRI for language lateralization. The benefits of this additional data were documented in a follow-up questionnaire during the re-evaluation of the patients. Patients (n=12) and healthy controls (n=12) participated in two …
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Neuro-zika: Brain structure and functional organization of adult humans with zika virus infection and severe neurological complications
… studies and FLAIR images automated lesion detection. These deviations from typical GBS urgently call for a characterization of a potential impact on the brain. Neuroimaging revealed gray matter volume reductions bilaterally in motor areas (supplementary motor cortex, specifically …
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Advanced clinical MRI for better outcome in epilepsy surgery. Focusing on fMRI and prediction of verbal memory decline.
… Surface coil 3T MRI did not contribute to detection of previously undiagnosed lesions. In 20% of patients, 3T MRI, compared with previous 1.0-1.5T MRI, provided new information about cortical lesions. The fMRI paradigm visualized memory-related activity in the MTL and provided information …
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Morphological quantitation software in breast MRI: application to neoadjuvant chemotherapy patients
… on other organs such as the breast wherein lesion morphology is known to be an important diagnostic and prognostic indicator. Recent work suggests benefits in assessing lesion texture in dynamic contrast-enhanced (DCE) images, especially with regards to changes during the initial enhancement …
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Clinical Translation of Optoacoustic Imaging in Breast Cancer
… assessment of benign and malignant breast lesions and their appearances on optoacoustic imaging. The patient study was divided into three phases. Phase 1 created a feature set to differentiate benign from malignant lesions, while Phase 2 was a transition between the prototype scanner and …