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 “"effective atomic number"”.
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Calculation of the effective atomic number for the iodine contrast agent of the varying concentrations
… system assembled by the author. A method of the effective atomic number mapping is discussed as a viable alternative to the traditional attenuation-based tomography. The dependency of the effective atomic number of the compound on the energy of the x-ray beam is a phenomenon well recorded in the …
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Dual energy image reconstruction and systems for application in proton therapy treatment planning
… is dependent on the electron density and effective atomic number of the material and describes the energy loss per unit length in the tissue. In current clinical practice, the SPR of patient tissues is obtained through single energy CT (SECT) scanning. The SECT scan results in a map of …
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Improving ion beam therapy treatment planning for metal implants by using dual-energy CT scanning
… allows to compute the electron density and effective atomic number. It could already be shown that this additional material information enables a more precise calculation of ion ranges. This thesis investigates the feasibility of the DECT approach for a range of metals from aluminum (Z = 13) …
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Multiple Monoenergetic Gamma Radiography (MMGR) using compact superconducting cyclotron
… a means to measure the areal density and the effective atomic number (Zeff) of an object with accuracy that surpasses existing interrogation methods and other major deployed systems. This radiography system was designed using an ION-12SC compact superconducting 12 MeV proton cyclotron. Using a …
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Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging
… computation and extraction of a target objects’ effective atomic number (Zeff) and its surface density (ρS) in the presence of masking layers.
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Sviluppo di un tomografo multi-energy per lo studio pre-clinico di nuove metodiche diagnostiche finalizzate al riconoscimento precoce della patologia tumorale
… to perform multi-energy investigation in a more effective way, as compared with conventional X-ray tubes. Multi-energy techniques allow extracting physical information from the materials, such as effective atomic number, mass-thickness, density, that can be used to distinguish and quantitatively …
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The Utility of X-Ray Dual-Energy Transmission and Scatter Technologies for Illicit Material Detection
… to characterize a material at the molecular and atomic levels. This ability is particularly important for detecting plastic explosives, where object shape information cannot be used. X-ray devices are relatively inexpensive compared to many other detection technologies. X-ray technology is …
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Material-Specific Computed Tomography for Molecular X-Imaging in Biomedical Research
… matter interaction physics to calculate the effective atomic number () and effective electron density () from PCCT image data for material identification. As the validation of the physics model, the and were calculated under various energy conditions for many materials. The relative standard …
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Dual Energy Computed to mography For Proton Therapy Treatment Planning
… computed tomography (CT) images based on the CT number-to-SPR calibration curve. The SPR derived from a single CT number carries large uncertainties in the presence of human tissue composition variations, which is the major drawback of the current SPR estimation method. We propose to solve this …