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 9 of 9 for “"list-mode"”.
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Objective Assessment Methods for List Mode Imaging System
… binned data. Here in this work, we focus on the list mode data, where instead of binning the incident locations, energies, or other formats of attributes, the attributes of each incident are recorded to form a list. This data format has the potential to extract more information from the system …
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List Mode Reconstruction in X-Ray CT and SPECT Imaging
… radiation doses, and more recorded attributes. List mode data, which records all attributes in a list format, offers distinct advantages over binned data, including reduced storage requirements, improved data accuracy, and enhanced flexibility in reconstruction techniques. This thesis explores …
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A prototype Compton imager : simulations, measurements and algorithm development
… a combination of silicon and CsI detectors. A model of the PCI has been simulated and validated, showing good agreement with measured data. The angular resolution of the PCI was measured to be 0.156 radians FWHM. Additionally, a method for determining the source-to-detector distance in the near …
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Modern Rossi alpha measurements
… fission chain could be measured at a time. The modern method allows many chains to be measured simultaneously by a pulse time tagging system such as the LANL custom designed List-mode module. This thesis examines the implementation of the modern Rossi-α method on the all highly enriched uranium, …
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Limits on subcritical reactivity determination using rossi-alpha and related methods
… performed using criticality eigenvalue (k-code) mode in MCNP R6.2. These simulations are used for comparisons on the linearity between α and ρ. Prompt neutron decay constant measurements in this work are performed using the Rossiα method. The measurements are taken using a 3He neutron detection …
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Event-Driven Motion Compensation in Positron Emission Tomography: Development of a Clinically Applicable Method
… the raw data of a PET system - the so-called `list-mode´ data. For routine acquisition of this raw data, methods have been developed which allow for the first time to acquire list-mode data from an ECAT Exact HR+ PET scanner within an acceptable time frame. Furthermore, methods for acquiring …
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Investigations into a positron emission imaging algorithm
… use of the entire set of lines-of-response in list-mode form is presented. The algorithm parameterises the lines-of-response by a Cartesian mesh over the field-of-view of a Positron Emission Tomography (PET) scanner to find their density distribution throughout the mesh. The algorithm is …
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Pulse Train Analysis Applied to the Re-Evaluation of Deadtime Correction Factors for Correlated Neutron Counting
… code MCNPXTM was used to generate a time-stamped list of neutron captures in 3He. Event times were processed in software to create neutron pulse trains akin to list mode data. The action of multiplicity shift register (MSR) electronics was modeled in software to analyse these pulse trains. Prior …
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Retrieving Information from Scattered Photons in Medical Imaging
… photon emission computed tomography (SPECT). To model the scattering of photons in biological tissue, we investigate using the Neumann-series form of the radiative transport equation (RTE). Since the scattering phenomenon are different in DOT and SPECT, the models are individually designed for …