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 17 of 17 for “"DECT"”.
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Performance Evaluation of DECT in Different Radio Environments
DECT is a cordless telephone standard whose applications are broadening with the advent of PCS services, wireless local loop (WLL), and the increasing demand for high data-rate wireless local area networks (WLANs). This thesis investigates the performance of DECT in different channel conditions. …
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Design and development of a frequency hopper based on the DECT system for the 902-928 MHz ISM band
The Digital European Cordless Telecommunications (DECT) standard defines a high-performance digital communications system for two-way transfer of speech and data information. This thesis is concerned with the development of a frequency hopping Spread spectrum transceiver based on the DECT radio …
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Performance Evaluation of Material Decomposition Using Rapid Kvp-Switching Dual-Energy Ct For Assessing Bone Mineral Density
… (SECT). Dual-energy computed tomography (DECT) is able to create two three-dimensional sets of images representing the densities of two materials in a given basis pair. DECT is theoretically capable of providing a true density measurement of trabecular bone material with the proper …
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Dual Energy Computed to mography For Proton Therapy Treatment Planning
… to solve this problem by using dual energy CT (DECT) and hypothesize that the range uncertainty can be reduced by a factor of two from currently used value of 3.5%.</p> <p>A MATLAB program was developed to calculate the electron density ratio (EDR) and effective atomic number (EAN) from two CT …
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Dual energy image reconstruction and systems for application in proton therapy treatment planning
… suggested recently is the use of dual energy CT (DECT). DECT is an emerging imaging modality that makes use of CT spectra to create two sets of CT images simultaneously. DECT relies on the energy independence of relative electron density, and the energy and atomic number dependence of X-ray …
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Improving ion beam therapy treatment planning for metal implants by using dual-energy CT scanning
… this problem. Dual Energy Computed Tomography (DECT) 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 …
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Identification of Intracranial Lesions With Dual-Energy Computed to mography and Magnetic Resonance Phase Imaging
… tissue.</p> <p>Dual-energy Computed Tomography (DECT) and Phase-Sensitive Magnetic Resonance Imaging (PS-MRI) represent two new imaging paradigms which both have the potential to more accurately identify intracranial calcification and hemorrhage. In DECT, x-ray tomography is acquired at two tube …
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Hepatocellular Carcinoma Image-Guided Intervention: Quantitative Characterization of Reagents For Thermochemical Ablation
… <p>Quantitative dual-energy computed tomography (DECT) imaging with cationic cesium (Cs<sup>+</sup>) as a theranostic was also evaluated for TCA image guidance. DECT high- and low-energy data was acquired of Cs<sup>+</sup> standards in a commercial phantom to determine the dual-energy ratio (DER) …
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Characterization of Low Density Intracranial Lesions Using Dual-Energy Computed to mography
… data at two different energies, dual-energy CT (DECT) collects information about the energy-dependent attenuation changes in a material and may help distinguish between two materials with similar linear attenuation measurements which would be impossible to differentiate using SECT.</p> <p>This …
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ESD Protected SiGe HBT RFIC Power Amplifiers
… 1.9 GHz Digitally Enhanced Cordless Telephone (DECT) applications. An on-chip shunt-L-series-C input matching network was used to provide ESD protection to the input pin of the DECT PA. A much more area efficient (as compared to the diode ring technique) Zener diode approach was used to protect …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… proton therapy: dual-energy computed tomography (DECT) and proton computed tomography (pCT). The former attempts to achieve better material differentiation than SECT by scanning the patient at two different photon energies. The latter aims to avoid sources of uncertainties in HU-to-SPR conversion …
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Evaluation and Clinical Implementation of a Dual-Energy CT Stopping-Power Ratio Mapping Technique for Proton-Therapy Treatment Planning
… is to use reconstructed dual-energy CT images (DECT) from two different spectra to estimate additional information of the scanned material such as effective electron density and mean excitation energy to address the degeneracies in today’s SECT-based HU-SPR calibration curves. Our lab previously …
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Palladium catalysed oligomerization of 1-alkynes
… although both cis and trans-dect-ene-6-yne were observed in most cases. Trimers were formed when phosphines were replaced with bldentate amines or phosphite ligands. A one to one mixture of PPh and (CH ) P gave the highest yield of oligomers with 6-methylene-nona-4-yne as the …
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Proton Computed Tomography: a novel calibration approach for proton treatment planning
… characterization. Emerging multi-energy CT (DECT and PCCT) and proton CT (pCT) technologies aim to enhance range accuracy by addressing these limitations. This PhD research focuses on evaluating the imaging performance of the INFN proton CT prototype, developing novel calibration methods …
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Feasibility of Using Virtual Unenhanced Images to Replace Pre-Contrast Images In Multiphase Renal Ct Examinations
… virtual unenhanced (VUE) images derived from DECT data in renal CT exams. Eliminating TUE image acquisition would reduce patient dose and increase patient throughput, improving clinical efficiency.</p> <p>A retrospective study was conducted for 60 consecutively selected patient exams. VUE and …
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Robust GMSK Demodulation Using Demodulator Diversity and BER Estimation
… nent wireless standards around the world (GSM, DECT, CDPD, DCS1800, and PCS1900). The dissertation begins with a literature review of GMSK demodu- lation techniques (coherent and noncoherent) and includes an overview of single- channel interference rejection techniques in digital wireless …
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Decoding algorithms for continuous phase modulation
… schemes such as GSM digital mobile systems, DECT and Iridium all use some form of CPM to transport their information. These implementations are normally pulse-shaped FSK or MSK and are used for the reasons above, except that their receivers do not always exploit the inherent memory. …