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 79 for “"polyps"”.
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Diagnosis of Colorectal Polyps Using Optical Projection Tomography
… Tomography in the diagnosis of colorectal polyps. Colonic polypoid cancers are the earliest detectable form of colorectal cancer and can potentially be cured if completely excised. The diagnosis using conventional 2D histopathology can be difficult due to epithelial displacement and 3D …
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Analysis of Colorectal Polyps in Optical Projection Tomography
… tomography enables 3-D imaging of colorectal polyps at resolutions of 5 – 10 μm. This thesis presents image analysis methods for the polyp diagnosis from such images. Specifically, we investigate 3-D texture-based recognition methods, as well as weakly supervised classification methods, for …
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A method to analyze the malignant potention of colorectal polyps using endoscopic images
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Genomic Characterization of Polyps In Familial Adenomatous Polyposis Patients and Identification of Candidate Chemopreventive Drugs
… one polyp were sequenced with a total of 25 polyps analyzed. In some cases, normal mucosa samples were also sequenced. We characterized point mutations, insertions, deletions and chromosomal allelic imbalance. In addition, we performed RNA sequencing of 8 polyps and 4 normal mucosa samples …
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Cancer free survival in mutation positive HNPCC individuals with colorectal adenomatous polyps identified on surveillance colonoscopy
The prevalence of colorectal cancer (CRC) places it in the top five cancers worldwide and is the second most common cause of cancer related death. Developed populations have a 5-6% lifetime risk of CRC(l). The South African Cancer Registry (last updated 2004) shows a 1/98 and 1/150 life time risk …
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An investigation of the association of colonic adenomatous polyps and nutritional status of retinol and carotene
… who were to undergo colonoscopy to determine polyps status were asked to undergo a battery of tests to assess nutritional status. These tests included a dietary and demographic questionnaire, serologic assessment of beta carotene and retinol, and a dark adaptation test. One hundred male …
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The prevalence and characteristics of incidental colorectal polyps in patients undergoing colonoscopy at a South African tertiary institution
… to February 2017 were retrieved. The presence of polyps, and their morphology, size, site and number in relation to ethnicity, symptoms, and colonoscopy quality indicators were analysed. The histological type and grade were obtained from laboratory records, and analysed. The primary endpoint was …
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Randomised study of EndoRings™-assisted vs. standard colonoscopy for detection of polyps in at risk individuals with Lynch Syndrome
… for detection and removal of adenomas and polyps, which are the precursors for cancer. Despite being the current gold standard, and accounting for all other variables (such as experience of the physician), conventional colonoscopy has been known to sometimes miss detecting adenomas/polyps, …
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SHAPE INFLUENCE IN MEDICAL IMAGE SEGMENTATION WITH APPLICATION IN COMPUTER AIDED DIAGNOSIS IN CT COLONOGRAPHY
… in the United States. Nearly all CRC arises from polyps and is preventable if polyps are removed in their early stage. Recent researches show that radiologists demonstrated higher accuracy in finding polyps with CAD than without CAD. In this dissertation, we review the current status of CAD …
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The utilisation of high frequency mini probe colonoscopic ultrasound in the assessment of colorectal disease
… of colonic cancer, malignant colorectal polyps, rectal polyps and diverticular disease<br/>High frequency 12 and 20 MHz ultrasound were used to locally stage colonic cancer and compare this to conventional CT in patients undergoing elective colonic resection. In addition, depth of …
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Feature Extraction and Feasibility Study on CT Image Guided Colonoscopy
… detection(CAPD) automatically detects colonic polyps and presents them to the user in either a first or second reader paradigm, with a goal reducing examination time while increasing the detection sensitivity. During colonoscopy, the endoscopists use the colonoscope inside of a patient's colon …
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The accuracy of 2D transvaginal ultrasound in the diagnosis of benign endometrial pathology: a comparison between ultrasonography and hysteroscopy
… common pathologies identified at histology were polyps and fibroids. For those patients who had a normal endometrium at ultrasound (n=59), hysteroscopy revealed 33.9% polyps, 5.1% submucosal fibroids and 49.2% normal/atrophic endometrium. The remainder of these patients demonstrated proliferative …
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Polyp Detection in Colonoscopy Video
Colonoscopy is the only screening that can detect polyps in the colon that can mutate into colorectal cancer. The task of detecting polyps is a job done by the doctors themselves who perform the procedure. It often happens that polyps are not recognized for reasons such as fatigue of the doctor …
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COMPOSITE KERNEL FEATURE ANALYSIS FOR CANCER CLASSIFICATION
… while providing a high detection performance of polyps, researchers are developing computer-aided detection (CAD) schemes that automatically detect suspicious lesions in CT colonography images. The overall goal of this study is to achieve a high performance in the detection of polyps on CT …
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Deformable Registration of Supine and Prone Colons for CT Colonography
… examines the entire colon in order to detect polyps and colorectal cancer. Most colon cancers malignantly transform from polyps, which are extra growths on the surface of the mucous membrane. Three dimensional endoscopic colon lumen interior images offered by CTC allow physicians to examine …
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Variação de formas de crescimento de Montastraea cavernosa (Linnaeus, 1767) (Cnidaria, Anthozoa, Scleractinia): uma abordagem modular
… cavernosa using the arrangement and the size of polyps in the inner face of the colonial of 46 samples collected in Parcel das Paredes (BA) and João Pessoa (PB). Results showed that area of the polyps is partially explained by factors related to the spacing among them. These factors vary with the …
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Colorectal Cancer Screening: A Non-Invasive Approach
… colorectal cancer, but 15 of the 47 patients had polyps. None of the symptoms showed a significant correlation with polyps according to chi-square analysis. T-tests of the means of the polyp group versus the no polyp group showed no difference between the population means for each of the examined …
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Evaluation of ambulatory diagnosis of abnormal uterine bleeding
… and malignant pathology among endometrial polyps? What is the significance of various risk factors associated with endometrial polyps? • What is the feasibility of multivariable analysis to evaluate combinations of diagnostic tests in the diagnosis of endometrial disease? Findings and …
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EOSINOPHILIC INFLAMMATION IN NASAL POLYPOSIS: REGULATION OF INTERLEUKIN 5 AND INTERLEUKIN 5 RECEPTOR α ISOFORMS
As the vast majority of bilateral nasal polyps (NP) are associated with a prominent eosinophilic inflammation and as eosinophils are well recognised in eliciting tissue damage and subsequent re-modelling, we aimed to investigate the role of eosinophils in the pathogenesis of NP. Especially the …
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Η ΠΑΝΣΙΓΜΟΕΙΔΟΣΚΟΠΗΣΙΣ ΕΙΣ ΤΗΝ ΑΝΙΧΝΕΥΣΙΝ ΤΩΝ ΟΡΘΟΚΟΛΙΚΩΝ ΟΓΚΩΝ ΚΑΙ Η ΣΗΜΑΣΙΑ ΑΥΤΗΣ ΕΙΣ ΤΗΝ ΠΡΟΛΗΨΙΝ ΤΟΥ ΚΑΡΚΙΝΟΥ ΤΟΥ ΠΑΧΕΟΣ ΕΝΤΕΡΟΥ
… IN THE AREA 0-25 CM WE FOUND 125 LESION (98POLYPS AND 27 CANCER), WHEREAS BEYOND THIS LIMIT 220 LESIONS (201 POLYPS AND19 CANCER) WERE FOUND. THE FIBEROPTIC PANSIGMOIDOSCOPE REPRESENTS FUNDAMENTALPROGRESS IN TECHNIQUES OF DETECTION OF TUMORAL RECTOSIGMOID LESION (ADENOMAS AND CARCINOMAS). IT …
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