Добірка наукової літератури з теми "Selective refocusing"
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Статті в журналах з теми "Selective refocusing"
Doll, Andrin, and Gunnar Jeschke. "Double electron–electron resonance with multiple non-selective chirp refocusing." Physical Chemistry Chemical Physics 19, no. 2 (2017): 1039–53. http://dx.doi.org/10.1039/c6cp07262c.
Повний текст джерелаBlechta, Vratislav, and Jan Schraml. "A selective INEPT experiment for the assignment of NMR lines of low-gyromagnetic ratio nuclei through long-range couplings." Collection of Czechoslovak Chemical Communications 56, no. 2 (1991): 258–61. http://dx.doi.org/10.1135/cccc19910258.
Повний текст джерелаBeguin, L., N. Giraud, J. M. Ouvrard, J. Courtieu, and D. Merlet. "Improvements to selective refocusing phased (SERFph) experiments." Journal of Magnetic Resonance 199, no. 1 (July 2009): 41–47. http://dx.doi.org/10.1016/j.jmr.2009.03.012.
Повний текст джерелаEmsley, Lyndon, and Geoffrey Bodenhausen. "Volume-selective NMR spectroscopy with self-refocusing pulses." Journal of Magnetic Resonance (1969) 87, no. 1 (March 1990): 1–17. http://dx.doi.org/10.1016/0022-2364(90)90081-j.
Повний текст джерелаHerbert Pucheta, José Enrique, Daisy Pitoux, Claire M. Grison, Sylvie Robin, Denis Merlet, David J. Aitken, Nicolas Giraud, and Jonathan Farjon. "Pushing the limits of signal resolution to make coupling measurement easier." Chemical Communications 51, no. 37 (2015): 7939–42. http://dx.doi.org/10.1039/c5cc01305d.
Повний текст джерелаMoore, Jay, Marcin Jankiewicz, Adam W. Anderson, and John C. Gore. "Evaluation of non-selective refocusing pulses for 7T MRI." Journal of Magnetic Resonance 214 (January 2012): 212–20. http://dx.doi.org/10.1016/j.jmr.2011.11.010.
Повний текст джерелаJie, FENG, WANG Shi-gang, WEI Jian, and ZHAO Yan. "Saliency detection combined with selective light field refocusing of camera array." Chinese Optics 14, no. 3 (2021): 587–95. http://dx.doi.org/10.37188/co.2020-0165.
Повний текст джерелаBikash, Uday, and N. Suryaprakash. "Enantiomeric Discrimination by Double Quantum Excited Selective Refocusing (DQ-SERF) Experiment." Journal of Physical Chemistry B 111, no. 43 (November 2007): 12403–10. http://dx.doi.org/10.1021/jp074873s.
Повний текст джерелаMarshman, Margaret F., Ian M. Brereton, Stephen E. Rose, Anthony J. O'Connor, and David M. Doddrell. "Application of self-refocusing band selective RF pulses for spectroscopic localization." Magnetic Resonance in Medicine 25, no. 2 (June 1992): 248–59. http://dx.doi.org/10.1002/mrm.1910250204.
Повний текст джерелаWang, Yingqian, Jungang Yang, Yulan Guo, Chao Xiao, and Wei An. "Selective Light Field Refocusing for Camera Arrays Using Bokeh Rendering and Superresolution." IEEE Signal Processing Letters 26, no. 1 (January 2019): 204–8. http://dx.doi.org/10.1109/lsp.2018.2885213.
Повний текст джерелаДисертації з теми "Selective refocusing"
Massire, Aurélien. "Non-selective Refocusing Pulse Design in Parallel Transmission for Magnetic Resonance Imaging of the Human Brain at Ultra High Field." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112180/document.
Повний текст джерелаIn Magnetic Resonance Imaging (MRI), the increase of the static magnetic field strength is used to provide in theory a higher signal-to-noise ratio, thereby improving the overall image quality. The purpose of ultra-high-field MRI is to achieve a spatial image resolution sufficiently high to be able to distinguish structures so fine that they are currently impossible to view in a non-invasive manner. However, at such static magnetic fields strengths, the wavelength of the electromagnetic waves sent to flip the water proton spins is of the same order of magnitude than the scanned object. Interference wave phenomena are then observed, which are caused by the radiofrequency (RF) field inhomogeneity within the object. These generate signal and/or contrast artifacts in MR images, making their exploitation difficult, if not impossible, in certain areas of the body. It is therefore crucial to provide solutions to mitigate the non-uniformity of the spins excitation. Failing this, these imaging systems with very high fields will not reach their full potential.For relevant high field clinical diagnosis, it is therefore necessary to create RF pulses homogenizing the excitation of all spins (here of the human brain), and optimized for each individual to be imaged. For this, an 8-channel parallel transmission system (pTX) was installed in our 7 Tesla scanner. While most clinical MRI systems only use a single transmission channel, the pTX extension allows to simultaneously playing various forms of RF pulses on all channels. The resulting sum of the interference must be optimized in order to reduce the non-uniformity typically seen.The objective of this thesis is to synthesize this type of tailored RF pulses, using parallel transmission. These pulses will have as an additional constraint the compliance with the international exposure limits for radiofrequency exposure, which induces a temperature rise in the tissue. In this sense, many electromagnetic and temperature simulations were carried out as an introduction of this thesis, in order to assess the relationship between the recommended RF exposure limits and the temperature rise actually predicted in tissues.This thesis focuses specifically on the design of all RF refocusing pulses used in non-selective MRI sequences based on the spin-echo. Initially, only one RF pulse was generated for a simple application: the reversal of spin dephasing in the transverse plane, as part of a classic spin echo sequence. In a second time, sequences with very long refocusing echo train applied to in vivo imaging are considered. In all cases, the mathematical operator acting on the magnetization, and not its final state as is done conventionally, is optimized. The gain in high field imaging is clearly visible, as the necessary mathematical operations (that is to say, the rotation of the spins) are performed with a much greater fidelity than with the methods of the state of the art. For this, the generation of RF pulses is combining a k-space-based spin excitation method, the kT-points, and an optimization algorithm, called Gradient Ascent Pulse Engineering (GRAPE), using optimal control.This design is relatively fast thanks to analytical calculations rather than finite difference methods. The inclusion of a large number of parameters requires the use of GPUs (Graphics Processing Units) to achieve computation times compatible with clinical examinations. This method of designing RF pulses has been experimentally validated successfully on the NeuroSpin 7 Tesla scanner, with a cohort of healthy volunteers. An imaging protocol was developed to assess the image quality improvement using these RF pulses compared to typically used non-optimized RF pulses. All methodological developments made during this thesis have contributed to improve the performance of ultra-high-field MRI in NeuroSpin, while increasing the number of MRI sequences compatible with parallel transmission
Ke, Jhih-Jheng, and 柯志正. "Preliminary Investigation on the Optimization of Heteronuclear Decoupling During Selective Refocusing Pulse in Solid State Nuclear Magnetic Resonance." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/mq6rbd.
Повний текст джерелаTiwari, Surbhi. "Manipulation of Spin Dynamics and Multifaceted Applications of NMR Spectroscopy to Small Molecules." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5242.
Повний текст джерелаBaishya, Bikash. "Spectral Simplification In Scalar And Dipolar Coupled Spins Using Multiple Quantum NMR : Developments Of Novel Methodologies." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/793.
Повний текст джерелаBaishya, Bikash. "Spectral Simplification In Scalar And Dipolar Coupled Spins Using Multiple Quantum NMR : Developments Of Novel Methodologies." Thesis, 2008. http://hdl.handle.net/2005/793.
Повний текст джерелаКниги з теми "Selective refocusing"
Svavarsdóttir, Sigrún. The Rationality of Ends. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198823841.003.0013.
Повний текст джерелаЧастини книг з теми "Selective refocusing"
Jones, Chris. "Networked Learning Environments." In Physical and Virtual Learning Spaces in Higher Education, 102–18. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-60960-114-0.ch007.
Повний текст джерелаТези доповідей конференцій з теми "Selective refocusing"
Sugie, Kenji, Kiyotaka Sasagawa, Mark Christian Guinto, Makito Haruta, Takashi Tokuda, and Jun Ohta. "Image refocusing of miniature CMOS image sensor with angle-selective pixels." In Microscopy Histopathology and Analytics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/microscopy.2020.mth3a.5.
Повний текст джерелаStuerwald, S., and R. Schmitt. "Readjusting image sharpness by numerical parametric lenses in Forbes-representation and Halton sampling for selective refocusing in digital holographic microscopy." In SPIE NanoScience + Engineering, edited by Michael T. Postek. SPIE, 2010. http://dx.doi.org/10.1117/12.860695.
Повний текст джерелаStuerwald, S., and R. Schmitt. "Readjusting image sharpness by numerical parametric lenses in Forbes-representation and Halton sampling for selective refocusing in digital holographic microscopy - Errata." In SPIE NanoScience + Engineering, edited by Michael T. Postek. SPIE, 2010. http://dx.doi.org/10.1117/12.903693.
Повний текст джерела