Дисертації з теми "Single-shot imaging"
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Deshpande, Hrishikesh. "Comparison of single shot methods for R2* estimation." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009m/deshpande.pdf.
Повний текст джерелаJia, Jie. "Fourier Multispectral Imaging." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1494159492377494.
Повний текст джерелаCochlin, Lowri Elizabeth. "Development and application of a single shot perfusion imaging method using magnetic resonance." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410624.
Повний текст джерелаGonzalez, Angarita Aura Inés. "Single shot lensless imaging with coherence and wavefront characterization of harmonic and FEL sources." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112055/document.
Повний текст джерелаLensless imaging techniques have broadened imaging applications to coherent sources in the short wavelength XUV domain, where optical systems to create an image are still not readily available. Furthermore, high harmonic generation sources (HHG) and free electron lasers (FEL) have the advantage of providing short temporal resolutions (atto 10-18s - femto 10-15s), opening the way towards ultrafast time resolved nanoscale imaging. Single shot imaging techniques are then highly important to exploit the shortest temporal resolution that can be reached with XUV sources. Lensless imaging is based on the direct measurement of the electric field diffracted by the sample. The diffraction pattern depends on the object transmittance but also on the source spatial coherence and wavefront. Single shot characterization of those properties thus leads to an improvement of the resolution of the object reconstruction.The results presented in this thesis are divided in two parts; the first one is focused on the characterization of the sources and the second on the development of new multidimensional imaging techniques. We will present different applications of single shot wavefront sensing of XUV sources. The results presented are the product of different experimental campaigns performed during this thesis using HH sources and FEL facilities at LCLS (Stanford) and FERMI (Trieste). Furthermore, a new method for single shot characterization of the spatial coherence that does not require the simultaneous measurement of the intensity distribution is presented. Additionally, we present a new holographic technique to improve the resolution of the object reconstruction when a partially coherent source is used.The second part is dedicated to two new multidimensional imaging techniques developed during the thesis. A new tri-dimensional imaging technique that is single shot, easy to implement and that lowers drastically the X-ray dose received by the sample, is presented. Different experimental setups for the generation of two synchronized XUV sources suitable for this ultrafast single shot 3D stereo imaging technique are presented. In addition, we present a holographic technique to extend imaging using a broadband source towards spectrally resolved single shot imaging and attosecond applications. Finally, we present the general conclusions from the work done during the thesis, together with the perspectives drawn from this work
Simon, Paul M. "Single Shot High Dynamic Range and Multispectral Imaging Based on Properties of Color Filter Arrays." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1303860321.
Повний текст джерелаMotooka, Makoto. "Single Breath-Hold Left Ventricular Volume Measurement by 0.3-Sec Turbo Fast Low-Angle Shot MR Imaging." Kyoto University, 2001. http://hdl.handle.net/2433/150520.
Повний текст джерелаNi, Chuan. "Spectral Filter Array for Multispectral Imaging." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1492374218701675.
Повний текст джерелаBornefalk, Hans. "Computer-aided detection and novel mammography imaging techniques." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3861.
Повний текст джерелаMarshall, Helen. "Exploration, Development and Application of Z-Shim and Allied Methods for Signal Recovery in Single-Shot Echo Planar Imaging." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487314.
Повний текст джерелаKabir, Amin. "Phase coherent photorefractive effect in II-VI semiconductor quantum wells and its application for optical coherence imaging." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282315981.
Повний текст джерелаBookjans, Eva M. "Relative number squeezing in a Spin-1 Bose-Einstein condensate." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37148.
Повний текст джерелаGe, Xunyou. "Imagerie ultrarapide à l’échelle nanométrique par diffraction XUV cohérente." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112361/document.
Повний текст джерелаUltrafast imaging of isolated objects with nanometric spatial resolution is a great challenge in our time. The lensless imaging techniques have shown great potential to answer this challenge. In lensless imaging, one can reconstruct sample images from their diffraction patterns with computational algorithms, which replace the conventional lens systems. Using ultrafast and coherent light sources, such as free electron laser and high order harmonics, one can investigate dynamic phenomena at the femtosecond time scale. In this thesis work, I present the lenless imaging experiments using XUV radiation provided by a laser driven high order harmonic beamline. The manuscript is composed of an introduction, a chapter of theoretical background, three chapters of main research work and a general conclusion with perspectives. The first part of this work concerns the development of the harmonic beamline to optimize the illumination condition for lensless imaging. The second part concentrates on the imaging techniques: the Coherent Diffraction Imaging (CDI), the Fourier Transform Holography (FTH) and the Holography using extended references (HERALDO). The reconstructions have achieved 78 nm spatial resolution in case of CDI and 112 nm resolution in case of HERALDO, both in single-shot regime corresponding to a temporal resolution of 20 fs. The third part presents the first physical application on the harmonic beamline using the lensless imaging. Samples with magnetic nano-domains have been studied with sub-100 nm spatial resolution, which paves the way for ultrafast magnetic dynamic studies. At the end, single-shot 3D imaging and further beamline development have been discussed
Hsu, Yi-Ting, and 許依婷. "Single-shot proton MR spectroscopic inverse imaging." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/39807869659281506153.
Повний текст джерела國立臺灣大學
醫學工程學研究所
102
Magnetic resonance spectroscopy (MRS) is a non-invasive technique that has been used to investigate the metabolic changes in living tissues. Fast magnetic resonance spectroscopy imaging (MRSI) using the proton-echo-planar-spectroscopy-imaging (PEPSI) technique can provide spatial distribution of metabolites in one single radio-frequency (RF) excitation. This method significantly reduces the scan time of 2-dimension MRSI down to 1 minute. Inverse imaging (InI) uses a highly parallel RF coil array to achieve 100-millisecond temporal resolution with the whole brain coverage. Combining PEPSI sequence with InI can further accelerate the MRSI data acquisition. InI reconstruction utilizes coil sensitivities to reconstruct the omitted partition/phase encoded data by solving an under-determined inverse problem. This study shows that the acceleration rate of the combined PEPSI and INI method is not as fast as expected. Specifically, using a 32-channel head coil array, we can achieve up to 6-fold acceleration in 2D PEPSI. Such scan time reduction can still increase the potential of applying MRSI to clinical applications.
Tsang, Min Ching Jean-Marc. "Techniques for single-shot volumetric fluorescence imaging." Thesis, 2021. https://hdl.handle.net/2144/41891.
Повний текст джерелаLi, Zhengyan. "Single-shot visualization of evolving, light-speed refractive index structures." Thesis, 2014. http://hdl.handle.net/2152/24789.
Повний текст джерелаtext
Wang, Xiaoqing. "Real-time MRI and Model-based Reconstruction Techniques for Parameter Mapping of Spin-lattice Relaxation." Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0023-3EEC-E.
Повний текст джерелаLin, Ya-Lin, and 林雅琳. "Construction of brain connectivity network using diffusion tensor imaging:A comparison between single-shot EPI and PROPELLER EPI." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/5a5fb8.
Повний текст джерела高雄醫學大學
醫學影像暨放射科學系碩士班
102
The brain is the most important organ with complex system to our body. Creating a global architecture of the anatomical connectivity network could help us more understanding how brain organizes and how brain was altered by disorders. Previous studies showed that DTI can successfully trace neuronal fiber tracts in vivo; however, DTI with single shot echo-planar imaging (EPI) has geometric distortion problem which might cause false fiber tracts in tractography. One way to achieving less distortion in DTI images is to use a periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) EPI technique. Therefore, the purpose of this study is to construct the anatomical connectivity network of human brain using DTI with PROPELLER EPI acquisition in order to reduce the distortion problem and improve the accuracy of connectivity analysis. In this study, we compare the connectivity network between DTI datasets with PROPELLER and single shot EPI, and we also attempt to observe sex differences in connectivity network between both techniques. The study enrolled 40 healthy subjects. All subjects underwent MRI scan using a 3T MR System. After acquiring 3D T1WI and distortion-free T2WI, PROPELLER DTI (pDTI) and single-shot DTI (ssDTI) data were acquired for comparison. After data acquisition, DTI tractography was performed to reconstruct all of white matter fiber tracts. Finally, the mean fiber tracts of every pair of regions were calculated as the connectivity indices of the network. The results showed that the PROPELLER DTI images exhibit substantially reduced geometric distortions as compared with single-shot DTI, and the anatomical connectivity network with PROPELLER DTI exhibited stronger connectivity between two brain regions. In addition, the results also found sex differences that the male subjects exhibited stronger connectivity mostly within hemispheres, but the female subjects had stronger connectivity mostly between hemispheres. Moreover, since DTI with PROPELLER EPI acquisition has less susceptibility distortions and more accurate fiber tracts. We concluded that the connectivity network with PROPELLER DTI would be more suitable for investigating the connectivity alterations of human brain in the future.