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 23 for “"Tomosynthesis"”.
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Tomosynthesis in pulmonary cystic fibrosis
… of this thesis were to investigate whether chest tomosynthesis might be used in pulmonary cystic fibrosis, to design and validate a tomosynthesis scoring system, and to determine the effective dose from chest tomosynthesis in children. In a prospective study starting in 2008 clinical chest …
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Perceptually Relevant Measurements in Tomosynthesis Imaging
… of projections in the case of digital breast tomosynthesis (aka 3D mammography) can alter the cancer screening diagnosis. Therefore, it is necessary to find which configuration is best so that least number of malignancies are missed by the radiologists. They examine hundreds of radiographs …
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Breast Tomosynthesis: Aspects on detection and perception of simulated lesions
… masses) in digital mammography (DM) and breast tomosynthesis (BT). Perception in BT image volumes were also investigated by evaluating certain reading conditions. The first study concerned the effect of system noise on the detection of masses and microcalcification clusters in DM images using a …
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TOMOGRAPHIC IMAGE RECONSTRUCTION: IMPLEMENTATION, OPTIMIZATION AND COMPARISON IN DIGITAL BREAST TOMOSYNTHESIS
… cancer detection. The limitations of current tomosynthesis systems include a longer scanning time than a conventional digital X-ray modality and a low spatial resolution due to the movement of the single X-ray source. Dr.Otto Zhou's group proposed the concept of stationary digital breast …
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Computer Aided Detection of Masses in Breast Tomosynthesis Imaging Using Information Theory Principles
… reader to improve radiologist performance. Tomosynthesis is a limited-angle cone-beam x-ray imaging modality that is currently being investigated to overcome mammography's limitations. CADe systems will play a crucial role to enhance workflow and performance for breast …
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An investigation into the design of an image reconstruction algorithm for continuous wave tomosynthesis
Continuous wave (CW) tomosynthesis provides many theoretical advantages over traditional breast imaging techniques, like mammography. These theoretical advantages include improved spatial resolution, better information weighting, and the ability to resolve structures hidden by tissue overlap. …
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Measurement of Tumor Extent and Effects of Breast Compression in Digital Mammography and Breast Tomosynthesis
… solved by a tomographic technique. Breast tomosynthesis (BT) reduces the detrimental effect of the projected anatomy. Tumor size is an important predictor of prognosis and treatment effect. We hypothesized that the tumor outline would be better defined in BT and therefore tumor measurement …
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A multimodal breast cancer imaging system using coregistered dynamic diffuse optical tomography and digital breast tomosynthesis
… of combining DOT with x-ray digital breast tomosynthesis (DBT) is especially synergistic as DBT prior information can be used to enhance the DOT reconstruction. DOT, in turn, provides a functional information overlay onto the mammographic images, increasing sensitivity and specificity to …
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Image reconstruction and imaging configuration optimization with a novel nanotechnology enabled breast tomosynthesis multi-beam X-ray system
<p>Digital breast tomosynthesis is a new technology that provides three-dimensional information of the breast and makes it possible to distinguish the cancer from overlying breast tissues. We are dedicated to optimizing image reconstruction and imaging configuration for a new multi-beam parallel …
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The Advantage of Digital Tomosynthesis for Pulmonary Nodule Detection concerning Influence of Nodule Location and Size: Phantom Study
Purpose: To investigate the advantage of DT over chest radiography (CXR) and dual-energy subtraction radiography (DES) for pulmonary nodule detection according to the location and size of simulated pulmonary nodule (SPN) Material and Methods: Four different sizes (5, 8, 10 and 12 mm in a diameter) …
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Modeling and Development of Iterative Reconstruction Algorithms in Emerging X-ray Imaging Technologies
… (CBCT), and in-line X-ray phase contrast (XPC) tomosynthesis. For each imaging modality, one or more specific problems prevent them being effectively or efficiently employed in clinical applications have been discussed. Firstly, to mitigate the long data-acquisition times and large radiation …
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Missed Breast Cancer Risk Factors and Clinicopathologic Features: A Six-Year Analysis of Data from a Single Institution
… in 34.42% (53/154), screening digital breast tomosynthesis in 23.38% (36/154), diagnostic mammography in 21.43% (33/154), diagnostic digital breast tomosynthesis in 7.79% (12/154), ultrasound in 6.49% (10/154) and MRI in 6.49% (10/154). False negative cancers were detected with diagnostic …
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C-ARM TOMOGRAPHIC IMAGING TECHNIQUE FOR DETECTION OF KIDNEY STONES
… stones. C-arm tomographic technique (C-arm tomosynthesis) as a new three dimensional (3D) kidney imaging method that provides a series of two dimensional (2D) images along partial circular orbit over limited view angle. Our experiments were done with kidney phantom which formed from a pig …
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Annular beam X-ray imaging
… enables focal plane images to be produced via tomosynthesis. These novel absorption contrast methods have been carefully designed to complement X-ray diffraction considerations. Prior work employing an annular beam concerned the collection of Xray diffraction data for structural analysis/phase …
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Ανάπτυξη συστήματος τομογραφικής απεικόνισης σε εξομοιωτή ακτινοθεραπείας
… units and is capable of performing Digital Tomosynthesis of anatomical planes with any orientation and at any distance from the isocenter. Optimization of efficiency has been achieved by segmenting the reconstruction process into discrete transformations that are specific to groups of …
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Investigation of optical and imaging characteristics of fluorescent screens for use in digital imaging detectors suitable for telemedicine
… times in order to be used in digital breast tomosynthesis (DBT) and dual energy imaging (DE). The aim of the present PhD thesis is the investigation of the optimum powder phosphor scintillator for use in a CMOS based digital imaging system and the investigation of the combination of the …
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Development of a flat-panel x-ray source
… could be used in tomography, radiography or tomosynthesis. Furthermore, the unit could be used as a portable X-ray scanner or an integral part of an existing detection system. The design incorporates a field emission cathode made of ultra-nanocrystalline diamonds (UNCD) doped with nitrogen. …
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Compressed Sensing Based Image Restoration Algorithm with Prior Information: Software and Hardware Implementations for Image Guided Therapy
… and removing distortion artifacts in 3D Digital Tomosynthesis (DTS) and 4D-DTS. The proposed restoration algorithm enables the enhanced resolution of temporal image and provides more anatomical information than conventional reconstructed images.</p><p>The performance of the algorithm was …
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Mammographic density in relation to breast cancer Tumor characteristics, mode of detection, and density assessments
… mammography examinations from the Malmö Breast Tomosynthesis Screening Trial. There was substantial agreement between the Breast Imaging-Reporting and Data System (BI-RADS) score from different radiologists and moderate agreement between the BI-RADS score and the fully automated volumetric …
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Image Processing Methods For Dual-Energy Contrast-Enhanced X-Ray Breast Imaging
… Digital mammography (DM) and digital breast tomosynthesis (DBT) are the current standards of care for breast cancer screening. However, these imaging modalities are insufficient for screening women who have a higher-than-average risk for developing breast cancer. Contrast enhanced (CE) breast …
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