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 1764 for “"ct"”.
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Image Quality Optimisation and Dose Management in CT, SPECT/CT, and PET/CT
The significant increase in the use of CT, alone or combined with SPECT or PET, has raised concerns about patient radiation exposure and the consequent increased risk of malignancy later in life. The overall objective of this work was to evaluate and optimise different approaches for minimising …
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Improving Cardiovascular Risk Assessment with CT Coronary Angiography and Myocardial CT Perfusion
… risk in various clinical settings. CT coronary angiography (CTCA) and myocardial CT perfusion (CTP) are promising techniques for the assessment of these factors. This thesis is comprised of several projects which explore refinements and new techniques aimed at improving diagnosis and …
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Stellenwert CT-gesteuerter Punktionen
… Untersuchung war die Beurteilung der CT-gesteuerten Punktion unter Berücksichtigung der Indikation, Trefferquote, des Komplikationsrisikos und der diagnostischen Aussagekraft. Für die Durchführung einer Gewebeentnahme besteht durch die Notwendigkeit der Abklärung unklarer Läsionen eine …
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Joint CT-MRI Image Reconstruction
… modalities. This strategy utilizes more structural and/or functional image information, thereby allowing clinical results to be more comprehensive and better interpreted. Since their inception, multimodal imaging techniques have received a great deal of attention for achieving enhanced …
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Histological characterization of CT-identified osteoarthritic subchondral cysts and co-registration of CT with MRI
Osteoarthritis (OA) is a chronic disease that affects the joints, most commonly hands, hips, knees, feet, and spine (Litwic et al. 2013). The disease becomes more common with advanced age and is one of the most prevalent causes of disability in older populations. Currently there is no cure besides …
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Development of Novel Cardiac CT Methods
… 2.7 deaths was associated with CVD. Cardiac CT has become a very valuable tool for non-invasive CVD diagnosis due to enabling technologies like helical scanning, fast rotation, multi-row detector, and advanced image reconstruction. However, challenges like cone-beam artifact reduction, …
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Motion correction of PET/CT images
… Emission Tomography/Computed Tomography (PET/CT) is one of the many tools currently used to diagnose health and disease in patients. PET/CT explorations are typically used to detect: cancer, heart diseases, disorders in the central nervous system. Since PET/CT studies can take up to 60 minutes …
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Die Darstellung des Felsenbeins in der Multi-Slice-CT - ein qualitativer Vergleich mit der Single-Slice-CT
… war, die Qualität von Mehr- und Einzeilen-Spiral-CTs in der Darstellung verschiedener anatomischer Strukturen des Felsenbeins zu vergleichen. Dabei wurden einerseits primär axial akquirierte Bilder beider Aufnahmetechniken verglichen, in der koronaren Ebene jedoch primär koronar akquirierte …
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A remote access CT colonography training system
Computed tomography colonography (CTC) is emerging as an alternative to conventional colonoscopy (CC). However CTC is not yet in widespread use due in part to the lack of suitably trained radiologists. We have developed a novel remote access system to train radiologists for colorectal cancer …
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In-Vivo Ct Dosimetry During Virtual Colonoscopy
… a minimally invasive means for identifying colorectal polyps and colorectal lesions by insufflating a patient’s bowel, applying contrast agent via rectal catheter, and performing multi-detector computed tomography (MDCT) scans. The technique is recommended for colonic health screening by the …
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4D CT based analysis of knee kinematics
Introduction: Total Knee Arthroplasty, which is the last resort of treatment for osteoarthritis, is aimed at restoring the functional anatomy of the knee. Despite the recent improvements in surgical techniques, limited range of motion, postoperative instability and malalignment still hinder the …
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Discrete ordinates CT organ dose simulator (DOCTORS)
<p>"Computed tomography (CT) has become pervasive in medical diagnostics as improved imaging techniques and processing algorithms provide higher quality information to doctors. However, the exponentially increasing usage of CT has raised concerns regarding long term low-dose radiological …
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Image Quality Analysis in Dual-Source CT
Dual Source CT (DSCT) is new CT medical application, in which three sets of image data can be obtained by two independent X ray tubes to achieve a better tissue differentiation. In the present work, the noise, low contrast and high resolution behavior is measured for the Siemens DSCT system …
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Gallium-68 DOTATATE PET/CT in Neuroendocrine Tumors
… 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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Thoracic Radiotherapy Treatment Planning With Cine Pet/Ct
… Four-dimensional computed tomography (4D-CT) is a useful tool to image tumor motion during normal respiration. Treatment margins can be reduced by targeting the motion path of the tumor. The expense and complexity of 4D-CT, however, may be cost-prohibitive at some facilities. We developed …
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Development of Spect and Ct Tomographic Image Reconstruction
… of statistically-based iterative reconstruction algorithms and protocols for both SPECT and micro CT data. Major contributions of this work to SPECT reconstruction include formulation and implementation of fully three-dimensional voxel-based system matrix in parallel-beam, fan-beam, and …
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