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 45 for “"CT Image"”.
-
Optimizations for Deep Learning-Based CT Image Enhancement
Computed tomography (CT) combined with deep learning (DL) has recently shown great potential in biomedical imaging. Complex DL models with varying architectures inspired by the human brain are improving imaging software and aiding diagnosis. However, the accuracy of these DL models heavily relies …
-
Applications of Statistical Modeling in Iterative CT Image Reconstruction
Traditionally, x-ray CT images are produced by an algorithm called filtered back projection, or FBP. FBP is an analytical solution to the idealized CT image reconstruction problem, the inverse problem of turning raw x-ray measurements into a full 3-dimensional (3D) image, and is derived assuming a …
-
Feature Extraction and Feasibility Study on CT Image Guided Colonoscopy
Computed tomographic colonography(CTC), also called virtual colonoscopy, uses CT scanning and computer post-processing to create two dimensional images and three dimensional virtual views inside of the colon. Computer-aided polyp detection(CAPD) automatically detects colonic polyps and presents …
-
COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION
… IDDM, are compared in the content of iterative CT image reconstruction algorithms. One of the key factors that limit the clinical application of an iterative reconstruction algorithm is the high computational cost which mainly depends on the system model. This thesis can serve as the basis for …
-
Evaluating and Improving 4D-CT Image Segmentation for Lung Cancer Radiotherapy
… and concurrent chemo-radiotherapy strategies. Image-guided radiotherapy provides for treatment measures, however, significant challenges exist for imaging, treatment planning, and delivery of radiation due to the influence of respiratory motion. 4D-CT imaging is capable of improving image …
-
Improved seed-based MR and CT image registration for prostate brachytherapy
… treatment, the implantation of radioactive seeds into the prostate, is increasing in popularity, spurred by advances in medical imaging techniques for prostate visualization. Successful brachytherapy requires precise positioning of implant seeds within the pelvic anatomy. Following …
-
Radiomics of Nsclc: Quantitative Ct Image Feature Characterization and Tumor Shrinkage Prediction
<p>Radiomics is the high-throughput extraction and analysis of quantitative image features. For non-small cell lung cancer (NSCLC) patients, radiomics can be applied to standard of care computed tomography (CT) images to improve tumor diagnosis, staging, and response assessment.</p> <p>The first …
-
A feasibility study on using CT image analysis for hardwood log inspection
… information about the log's internal defects prior to log breakdown. Studies have shown that a 7 to 21 percent improvement in log value recovery can be achieved if the location and identity of internal defects are known. Recent developments in advanced nondestructive testing methods such …
-
Comparative Study on Alveolar Bone Level of Maxillary Molar Area and Anatomical Variation of Maxillary Sinus with CT Image
… the best way to obtain information would be the CT (Computerized Tomography). Meanwhile, for 189 patients who came to the dental center of Ajou University Hospital for the purpose of implant insertion using the CT from 2003 to 2007, the presence of the amount of remaining bones and septum near …
-
The Effect of Ultra-short Acting Insulin on F-18 FDG PET/CT Image Quality of Patients with Uncontrolled Diabetic Mellitus
혈당이 조절되지 않는 당뇨 환자에서 F-18 FDG PET/CT의 영상의 질은 좋지 않다. 본 연구에서는 당뇨 환자의 F-18 FDG PET에서 초속효성 인슐린의 효과와 임상적 유용성에 대해 알아보고자 하였다. 본 연구는 각종 암으로 진단 받은 당뇨 환자 중 F-18 FDG PET/CT를 시행한 105명(남/여: 68/37, 평균나이: 60±12세)을 대상으로 하였다. F-18 FDG 주사 60분 전 혈당이 190mg/dl 이상인 환자(n=53)에게 초속효성 인슐린(Humalog？？)을 정맥 주사하였다. 혈당이 189mg/dl …
-
Offline and Online Interactive Frameworks for MRI and CT Image Analysis in the Healthcare Domain : The Case of COVID-19, Brain Tumors and Pancreatic Tumors
… imaging represents the organs, tissues and structures underneath the outer layers of skin and bones etc. and stores information on normal anatomical structures for abnormality detection and diagnosis. In this thesis, tools and techniques are used to automate the analysis of medical images, …
-
Improvements on low-cost high-resolution CT system
Computed tomography (CT) is an x-ray based inspection technique used to analyze the three dimensional structure of an object. The goal of this thesis is to show that good CT image quality can be achieved with low cost CT systems while maintaining high resolution and keeping the collection time for …
-
3D approximation of scapula bone shape from 2D X-ray images using landmark-constrained statistical shape model fitting
… and operation costs are higher. However, 3D images are desirable in a range of clinical applications, for example surgical planning. The aim of this research was to develop a tool for 3D approximation of scapula bone from 2D X-ray images using landmark-constrained statistical shape model …
-
The Effect of CT Display Window and Image Plane on Diagnostic Certainty for Characteristics of Canine Elbow Dysplasia
Computed tomography (CT) is an established diagnostic modality for evaluation of canine elbow dysplasia. However, diagnostic sensitivity for elbow abnormalities may be affected by variations in CT image quality. Currently there are no data-based recommendations for elbow CT image display …
-
Quantitative evaluation of image quality in CT imaging using iodine and nanoparticle-based contrast agents
Abstract Background: Computed tomography (CT) relies on X-ray attenuation differences to distinguish tissues, often enhanced using contrast agents. Although iodine-based media are commonly used, they are limited by toxicity, rapid renal clearance, and risk of allergic reactions. Subsequently …
-
Utilizing Computed to mography Image Features to Advance Prediction of Radiation Pneumonitis
… was to demonstrate the potential gain in predictive accuracy of normal tissue complication probability models for RP by considering CT-based image features extracted from the normal lung volume.</p> <p>To accomplish this, a software framework was first built to facilitate CT image feature …
-
A Comparison of Artificial Neural Network Classifiers for Analysis of CT Images for the Inspection of Hardwood Logs
This thesis describes an automatic CT image interpretation approach that can be used to detect hardwood defects. The goal of this research has been to develop several automatic image interpretation systems for different types of wood, with lower-level processing performed by feed forward artificial …
-
Lung Perfusion CT: Differentiation between Lung Cancer and Progressive Massive Fibrosis
PURPOSE: To evaluate the usefulness of perfusion CT in the differential diagnosis between progressive massive fibrosis and lung cancer. MATERIALS AND METHODS: We retrospectively analyzed the perfusion CT image of 20 lesions in 13 patients with progressive massive fibrosis. Using 16 channel …
-
A feasibility evaluation of x-ray fluorescence emission tomography and x-ray luminescence tomography for real-time assessment of photodynamic therapy
… therapy, uses a photosensitive compound activated by a specific wavelength photon to produce cytotoxic oxygen species (either in free radical form or in singlet form). However, weak penetration of visible, infrared, and UV light into the body to activate the photosensitive compound …
-
A cellular method for modeling solid features in volume data
… years involving the use of three dimensional images such as those created by Magnetic Resonance Imaging (MRI), and Computed Tomography (CT). An MRI or CT image presents data in the form of a three dimensional array of cubic elements called voxels. The array is created from individual slabs …
Page 1 of 3