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 40 for “"computer tomography"”.
-
Signal Processing Issues in Synthetic Aperture Radar and Computer Tomography
Other work dealt with bandlimited signal interpolation. These studies involved designing a new interpolation algorithm, which is minimax optimal for the interpolation of bandlimited signals. Assuming a class of computationally efficient interpolators, a suboptimal interpolation algorithm was …
-
Assessment of brown-rot decay using X-ray computer tomography and ultrasonic measurements
… to the controlled decay. X-ray computed tomography (CT) was then carried out. From the CT scans and recorded mass data, the specimens’ corresponding volumes and densities were calculated. Blocks decayed for twelve weeks experienced, on the average, the greatest loss of mass (≈40%), volume …
-
The Missing Cone Problem in Computer Tomography and a Model for Interpolation in Synthetic Aperture Radar
… missing cone or limited view angle problem in computer tomography. In this problem only an incomplete set of projection data is available from which an image must be reconstructed. The data are limited in the sense that projections are available only over a limited view angle, a restricted …
-
An experimental and theoretical approach to correct for the scattered radiation in an X-ray computer tomography system for industrial applications
The main problem connected to cone beam computed tomography (CT) systems for industrial applications employing 450 kV X-ray tubes is the high amount of scattered radiation which is added to the primary radiation (signal). This stray radiation leads to a significant degradation of the image quality. …
-
CORONARY ARTERY CALCIUM SCORES FOR ATHEROSCLEROTIC CARDIOVASCULAR DISEASE RISK STRATIFICATION IN SMOKERS: MULTI-ETHNIC STUDY OF ATHEROSCLEROSIS
… Screening for lung cancer with low-dose computer tomography (LDCT) is recommended for a specified group of cigarette smokers. Coronary artery calcium (CAC) can be obtained from these LDCT scans. The utility of CAC for atherosclerotic cardiovascular disease (ASCVD) risk stratification …
-
Markov random field image modelling
… a priori information in image processing using computer tomography (CT) as an example. Prior information is information about the solution that is known apart from measurement data. This information can be represented as a probability distribution. In order to define a probability density …
-
Synthetic Aperture Radar Image Formation for the Moving -Target and Near -Field Bistatic Cases
… by a newly proposed fast BP algorithm in computer tomography. First we show that the BP algorithm is the spatial-domain counterpart of the benchmark o -- k algorithm in bistatic SAR imaging, yet it avoids the frequency-domain interpolation in the o -- k algorithm, which may cause artifacts …
-
Papildomas adenozino vaidmuo mažinant infarkto dydį ir išsaugant kairiojo skilvelio funkciją pacientams, sergantiems ūminiu miokardo infarktu /
… imaging methods (single photon emission computer tomography, transthoracic Doppler echocardiography, dobutamine stress echocardiography) it was estimated, that adenosine preserves myocardial contractility and coronary flow reserve during the acute phase of myocardial infarction, reduces …
-
A Patient-specific Irreversible Electroporation Treatment Planning Model Based on Human Tissue Properties
… currently rely on for IRE treatment planning are computer tomography (CT), ultrasound (US) imaging, and real-time resistance measurement is used to monitor treatment progress. However, there is currently no method to plan optimal pulse parameters such as voltage, pulse duration, pulse number, and …
-
Adrenomedullin in dental tissues
… with ADM using techniques including micro-Computer Tomography did not identify significant differences in craniofacial mineralised tissue structures compared to sham treated controls. The data presented here along with the known pleiotropic properties of ADM indicate it may be an important …
-
Transorbital ultrasound measurement of the optic nerve sheath diameter (ONSD) as a screening tool for raised intracranial pressure in an acute care setting in children
… assessed, and had indications for cranial computer tomography (CT) scan. All optic nerve sheath imaging was conducted by a single investigator, experienced in the use of ultrasound for emergency care. ONSD measurements were conducted using a high frequency, linear array probe. Patients were …
-
Calculation of the effective atomic number for the iodine contrast agent of the varying concentrations
… the blood stream via the traditional gray-scale computer tomography and searches for the new imaging modalities that would provide for better sensitivity. The topic of the energy-discriminative color CT is discussed as a potential solution and its suitability is evaluated by performing the …
-
A retrospective review of CTPA confirmed pulmonary emboli in COVID-19 patients admitted to Groote Schuur Hospital, Cape Town
… incidence and characteristics of PE confirmed by Computer Tomography Pulmonary Angiogram (CTPA) in patients with COVID-19 pneumonia admitted to a tertiary hospital in the Western Cape, South Africa. Methods: We performed a retrospective-, descriptive study of all adult patients with COVID-19 …
-
Interreadervarianz bei der HRCT- und CXR-Befundung in einer Längsschnittstudie bei ehemals asbeststaubexponierten Personen
… of formerly asbestos-exposed persons the computer tomography (CT) is gaining an increasing influence besides the standard x-ray scans. A number of studies has been performed to investigate the interreader variance of two observers evaluating radiographic appearances of pneumoconiosis. The …
-
Automated Measurement of Midline Shift in Brain CT Images and its Application in Computer-Aided Medical Decision Making
… the focus is given to processing of the CT (Computer Tomography) brain images to automatically calculate midline shift in pathological cases and use it to predict Intracranial Pressure (ICP). The midline shift measurement can be divided into three steps. First the ideal midline of the brain, …
-
Early sequelae of post COVID-19 lung disease in patients who were mechanically ventilated for severe COVID-19 pneumonia
… patients (24/26) who underwent high resolution computer tomography (HRCT) of the chest, with ground glass opacities (46%) and interstitial thickening (58%) being most common. No significant risk factors for post-COVID-19 impairment were identified. Conclusion: At 3 months after hospitalization, …
-
Development of a novel uncovered stent system for the management of complex aortic aneurysms
… analysis was performed based on patient-specific computer tomography angiography (Chapters 5&6). Structural stress concentrations were observed within the landing zones, which increased with the number of stents deployed. In the parameter studies (Chapter 6), the overall porosity was identified as …
-
Resection of biliary mucinous cystic neoplasms: Study of a single institutional cohort and a literature review
… 45 years) had surgery. Eleven were diagnosed by computer tomography scan after investigation of abdominal pain or a palpable mass. Two were jaundiced. One cyst was found incidentally during an elective cholecystectomy. Five cysts were located centrally in the liver. Before referral three cysts …
-
Characteristics of blood vessel wall and atherosclerosis using high frequency ultrasound signals
… ultrasound, electroencephalogram, computed tomography and magnetic resonance imaging use signal and image processing techniques to determine the physical and biological properties of the tissues and organs. The underlying principle in signal processing in medicine is that the response of a …
-
Vergleich zweier Messverfahren zur Überprüfung der Implantatgenauigkeit in der Navigationschirurgie : Computertomographie (CT) vs. Koordinatenmessgerät (KMG) ; eine In-vitro-Studie
… and survival rate of the insert implants trough computer aided surgery (CAS-) techniques places strict requirements on implant positioning to reach a high medical benefit out of function, esthetic and prosthetic view. The aim of the following in vitro study is to evaluate the accuracy of …
Page 1 of 2