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 25 for “"Gamma camera"”.
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New to ols For Monitoring Gamma Camera Uniformity
… performance characteristic of all modern gamma camera systems, and ensuring a stable, uniform detector response is critical for maintaining clinical images that are free of artifact. For these reasons, the assessment of detector uniformity is one of the most common activities associated …
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The conceptualization and parameterization of a gaseous detector rasterizing pinhole gamma camera
… of a gaseous detector rasterizing pinhole gamma camera. In this thesis, there is a literature review that describes the historical development of gamma imaging, a technical background that aims to give the reader the prerequisite background knowledge, a methodology, and, a result and …
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Applications of Multi-Pinhole Gamma Camera Collimation to Tomography and Image Enhancement
Recently, multi-pinhole gamma camera collimation has been introduced in the field of emission tomography. This collimation process simultaneously produces several images covering a limited angular range, which may then be recombined to obtain tomographic slices of the object imaged. This study has …
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Experience using a small field of view gamma camera for intraoperative sentinel lymph node procedures
… or the use of a radiotracer with intraoperative gamma counting. The most complex procedures involve the use of blue dye, the use of a radiotracer with preoperative gamma imaging and preoperative gamma counting, intraoperative gamma counting, or some combination of these techniques. The ideal …
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Development of the MRC-SPECT-II system: a MR-compatible small-animal SPECT system based on semiconductor imaging spectrometers and a Synthetic Compound-Eye gamma camera design
… innovative geometry named Synthetic Compound-Eye gamma camera, bioinspired to compound eyes often found as vision system in small invertebrates. Preliminary studies demonstrate that the proposed system offers an unprecedented spectroscopic performance (1.71 ± 0.28 keV at 122 keV) in a broad energy …
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Studies of gastric emptying in man
… methods "based on a rectilinear scanner or gamma camera. Xn. the initial studies with a scanner. indium-113m DTPA was evaluated as a possible radionuclide marker for a test meal and was found to be satisfactory. Tecluietium~99-1t DTPA was subsequently assessed in similar studies with a gamma …
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Development of an Approach to Increase Drug Uptake to Bone Tumors Using Non-Invasive Mechanical Loading
… completed in vivo using planar microSPECT (2D gamma camera scans) employing a rat model of bone metastases. The pilot study using this methodology demonstrated that non-invasive mechanical loading enhanced drug delivery to cancerous tibial tumors by 34% when compared to contralateral …
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Inverted compound eye camera for second generation MRI compatible SPECT system
… based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 ICE-camera panels that consists of a very large number (up to 1500) of independent …
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A study of charge motion in rotary mills, with particular reference to the grinding action
… front and side views of a transparent mill, and gamma-camera filming of a radioactive ball. Analysis of the trajectories of the balls revealed several phenomena in the milling action that have not been reported until now. It was observed that the paths of the balls are smooth, that they spiral in …
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Homing of 111In-Labeled Bone Marrow Mesenchymal Stem Cells in Acute Brain Trauma Model
… those in sham-operated rats and normal rats by gamma camera images. The migration of 111In-BMSCs to the traumatic brain was evaluated using confocal microscope. The labeling efficiency of 111In-BMSCs was 66 ± 5%, and their retention rate was 85.3% at 1 h after labeling. There was no difference …
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Detection of improvised explosive devices at long-range using coded aperture imaging of backscattered X-rays with dynamic reconstruction
… determined the optimal mask fill factor, gamma camera imaging protocols, and experimental geometry by examining the resulting effects on image quality. Reconstructed images were analyzed for Contrast-to-noise ratio (CNR), Signal-to-noise Ratio (SNR), resolution, sharpness, the uniformity …
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Image processing techniques in nuclear medicine
… techniques to radionuclide images acquired on a gamma camera - computer system has been investigated. <br></br><br></br>Hepatic perfusion imaging studies with <sup>99</sup>Tc<sup>m</sup>-tin colloid were performed in patients with primary colorectal carcimma. The hepatic perfusion index performed …
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Molecular imaging of spatio-temporal distribution of angiogenesis in hindlimb ischemia model and diabetic milieu
… with the aid of a dedicated high resolution gamma camera, is a very sensitive imaging approach for the evaluation of angiogenesis in the rabbit hindlimb ischemia model. Furthermore, diabetes mellitus (DM) was induced, to study the effects of this pathology on the spatio-temporal distribution …
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Development of high performance single photon emission computed tomography systems for simultaneous nuclear molecular imaging and magnetic resonance imaging
… NMI and MRI, an inverted compound-eye (ICE) gamma-ray camera was proposed here for SPECT imaging applications and experimentally verified through a prototype system. The MRC-SPECT-II was designed utilizing 24 ICE gamma camera modules and consisted of more than 1,500 micro-pinhole cameras. The …
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A Novel Methodology for Iterative Image Reconstruction in SPECT Using Deterministic Particle Transport
… a radionuclide within a patient are counted at a gamma camera to form a 2-dimensional projection of the 3-dimensional radionuclide distribution within the patient. This unknown 3-dimensional source distribution can be reconstructed from many 2-dimensional projections obtained at different angles …
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Characterization of The Count Rate Performance and Evaluation of The Effects of High Count Rates On Modern Gamma Cameras
… OF THE EFFECTS OF HIGH COUNT RATES ON MODERN GAMMA CAMERAS<strong></strong></p> <p>Michael Stephen Silosky, B.S.</p> <p>Supervisory Professor: S. Cheenu Kappadath, Ph.D.</p> <p>Evaluation of count rate performance (CRP) is an integral component of gamma camera quality assurance and measurement …
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Single photon emission computed tomography: performance assessment, development and clinical applications
… and limitations of the particular gamma camera imaging system used. Thus the first part of this thesis is concerned with an assessment of the performance characteristics of the SPECT system itself. This involves the measurement of the fundamental planar imaging properties of the …
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Evaluation of a Dedicated SPECT-CT Mammotomography System for Quantitative Hybrid Breast Imaging
… using the same high performance, semi-conductor gamma camera. Due to the greater positioning flexibility of the SPECT system gantry, under a wide range of measurement conditions, statistically significantly (p<0.05) more lesions and smaller lesion sizes were detected with dedicated breast SPECT …
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The role of EHIDA Cholescintigraphy in the diagnosis of Human Sphincter of Oddi Dysfunction
… [99mTc] Cholecis) has its transit captured on a gamma camera as it travels through the liver and biliary tree to reach the duodenum. One particular measure was studied, this is described as, Texcretion the time taken for the 'tracer' to reach the duodenum. A high value for Texcretion of greater …
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Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
… photon source are evaluated. A simplified gamma camera model, which consists of a collimator and NaI(Tl) detector is simulated to obtain the point spread function (PSF) of the point source ‘image’. The PSF can be represented as a Gaussian function. Estimation of σ of the Gaussian function …
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