Articoli di riviste: "Holography in medicine"

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Nolte, David D. "Cancer Holography for Personalized Medicine". Optics and Photonics News 32, n. 4 (1 aprile 2021): 42. http://dx.doi.org/10.1364/opn.32.4.000042.

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Shang, Guanyu, Zhuochao Wang, Haoyu Li, Kuang Zhang, Qun Wu, Shah Burokur e Xumin Ding. "Metasurface Holography in the Microwave Regime". Photonics 8, n. 5 (22 aprile 2021): 135. http://dx.doi.org/10.3390/photonics8050135.

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Hologram technology has attracted a great deal of interest in a wide range of optical fields owing to its potential use in future optical applications, such as holographic imaging and optical data storage. Although there have been considerable efforts to develop holographic technologies using conventional optics, critical issues still hinder their future development. A metasurface, as an emerging multifunctional device, can manipulate the phase, magnitude, polarization and resonance properties of electromagnetic fields within a sub-wavelength scale, opening up an alternative for a compact holographic structure and high imaging quality. In this review paper, we first introduce the development history of holographic imaging and metasurfaces, and demonstrate some applications of metasurface holography in the field of optics. We then summarize the latest developments in holographic imaging in the microwave regime. These functionalities include phase- and amplitude-based design, polarization multiplexing, wavelength multiplexing, spatial asymmetric propagation, and a reconfigurable mechanism. Finally, we conclude briefly on this rapidly developing research field and present some outlooks for the near future.

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Heiss, P., e W. Waters. "Three-Dimensional Imaging in Medicine: Holography". Nuklearmedizin 25, n. 01 (1986): 31–32. http://dx.doi.org/10.1055/s-0038-1624316.

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SummaryTwo holographic methods for three-dimensional imaging in medicine are presented. The methods can be applied on the base of various primary projection methods, especially those of nuclear medicine and roentgenology. This three-dimensional display, which is not bound to complicated technical equipments such as computers and graphic displays, can be performed easily at any place: in conference rooms, in surgical units etc. It may be of particular importance for the surgeon in order to visualize the site directly and in its real space dimensions.

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Jung, Minwoo, Hosung Jeon, Sungjin Lim e Joonku Hahn. "Color Digital Holography Based on Generalized Phase-Shifting Algorithm with Monitoring Phase-Shift". Photonics 8, n. 7 (28 giugno 2021): 241. http://dx.doi.org/10.3390/photonics8070241.

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Color digital holography (DH) has been researched in various fields such as the holographic camera and holographic microscope because it acquires a realistic color object wave by measuring both amplitude and phase. Among the methods for color DH, the phase-shifting DH has an advantage of obtaining a signal wave of objects without the autocorrelation and conjugate noises. However, this method usually requires many interferograms to obtain signals for all wavelengths. In addition, the phase-shift algorithm is sensitive to the phase-shift error caused by the instability or hysteresis of the phase shifter. In this paper, we propose a new method of color phase-shifting digital holography with monitoring the phase-shift. The color interferograms are recorded by using a focal plane array (FPA) with a Bayer color filter. In order to obtain the color signal wave from the interferograms with unexpected phase-shift values, we devise a generalized phase-shifting DH algorithm. The proposed method enables the robust measurement in the interferograms. Experimentally, we demonstrate the proposed algorithm to reconstruct the object image with negligibly small conjugate noises.

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Dirtoft, B. I. "Dental Holography—Earlier Investigations and Prospective Possibilities". Advances in Dental Research 1, n. 1 (dicembre 1987): 8–13. http://dx.doi.org/10.1177/08959374870010011701.

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Optical measuring techniques- such as holography, contouring, moire, and speckle- offer new nondestructive possibilities for bridging the gap between in vitro and in vivo measurements in dentistry, and thus increase the possibility of achieving more accurate and sometimes more objective diagnosis and therapy. This presentation is an attempt to illuminate the future prospects of holography and speckle in the dental field by giving a survey of the past in combination with a vision of the future. Holographic determination of implant properties and polymer testing are discussed to show that different prosthodontic constructions and different dental materials can be tested to obtain information about their deformational behavior. Conditions such as loading, temperature, and moisture are no obstacle, and functional tests can be carried out on realistic objects with complex shapes and various thicknesses as well as on test samples. This can be a great advantage in that it facilitates the laboratory testing of samples of real size and shape under the same conditions as those in clinical testing. Although the oral environment gives rise to a very complex situation, including many parameters with unknown relations and magnitudes, optical methods sometimes provide a picture of the total course of events. Furthermore, clinical time can be saved this way by a reduction of the time needed for treatment of the patient. The future is exciting, but it requires further developments using different optical methods. This is not an utopia; interdisciplinary collaborations and communications between the technical and dental fields are imperative.

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AOYAMA, K., e Q. RU. "Electron holographic observation for biological specimens: electron holography of bio-specimens". Journal of Microscopy 182, n. 3 (giugno 1996): 177–85. http://dx.doi.org/10.1046/j.1365-2818.1996.133413.x.

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Schjelderup, Vilhelm. "Holography, Biophysics and Acupuncture". Acupuncture in Medicine 3, n. 1 (gennaio 1986): 20–23. http://dx.doi.org/10.1136/aim.3.1.20.

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Müller, André F., Ilja Rukin, Claas Falldorf e Ralf B. Bergmann. "Multicolor Holographic Display of 3D Scenes Using Referenceless Phase Holography (RELPH)". Photonics 8, n. 7 (30 giugno 2021): 247. http://dx.doi.org/10.3390/photonics8070247.

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In this paper, we present a multicolor display via referenceless phase holography (RELPH). RELPH permits the display of full optical wave fields (amplitude and phase) using two liquid crystal phase-only spatial light modulators in a Michelson-interferometer-based arrangement. Complex wave fields corresponding to arbitrary real or artificial 3D scenes are decomposed into two mutually coherent wave fields of constant amplitude whose phase distributions are modulated onto the wave fields reflected by the respective light modulators. Here, we present the realization of that concept in two different ways: firstly, via temporal multiplexing using a single setup, switching between wavelengths for temporal integration of the respective wavefields; secondly, using spatial multiplexing of different wavelengths with multiple Michelson-based setups; and finally, we present an approach to magnify the 3D scenes displayed by light modulators with limited space–bandwidth product for a comfortable viewing experience.

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Tahon, Marie, Silvio Montresor e Pascal Picart. "Towards Reduced CNNs for De-Noising Phase Images Corrupted with Speckle Noise". Photonics 8, n. 7 (3 luglio 2021): 255. http://dx.doi.org/10.3390/photonics8070255.

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Digital holography is a very efficient technique for 3D imaging and the characterization of changes at the surfaces of objects. However, during the process of holographic interferometry, the reconstructed phase images suffer from speckle noise. In this paper, de-noising is addressed with phase images corrupted with speckle noise. To do so, DnCNN residual networks with different depths were built and trained with various holographic noisy phase data. The possibility of using a network pre-trained on natural images with Gaussian noise is also investigated. All models are evaluated in terms of phase error with HOLODEEP benchmark data and with three unseen images corresponding to different experimental conditions. The best results are obtained using a network with only four convolutional blocks and trained with a wide range of noisy phase patterns.

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White, Nicholas. "Holography-the clear plate syndrome". Journal of Audiovisual Media in Medicine 10, n. 4 (gennaio 1987): 135–37. http://dx.doi.org/10.3109/17453058709150470.

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Lichte, Hannes. "Electron Holography: phases matter". Microscopy 62, suppl 1 (25 aprile 2013): S17—S28. http://dx.doi.org/10.1093/jmicro/dft009.

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Tian, Zhenhua, Zeyu Wang, Peiran Zhang, Ty Downing Naquin, John Mai, Yuqi Wu, Shujie Yang et al. "Generating multifunctional acoustic tweezers in Petri dishes for contactless, precise manipulation of bioparticles". Science Advances 6, n. 37 (settembre 2020): eabb0494. http://dx.doi.org/10.1126/sciadv.abb0494.

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Acoustic tweezers are a promising technology for the biocompatible, precise manipulation of delicate bioparticles ranging from nanometer-sized exosomes to millimeter-sized zebrafish larva. However, their widespread usage is hindered by their low compatibility with the workflows in biological laboratories. Here, we present multifunctional acoustic tweezers that can manipulate bioparticles in a disposable Petri dish. Various functionalities including cell patterning, tissue engineering, concentrating particles, translating cells, stimulating cells, and cell lysis are demonstrated. Moreover, leaky surface acoustic wave–based holography is achieved by encoding required phases in electrode profiles of interdigitated transducers. This overcomes the frequency and resolution limits of previous holographic techniques to control three-dimensional acoustic beams in microscale. This study presents a favorable technique for noncontact and label-free manipulation of bioparticles in commonly used Petri dishes. It can be readily adopted by the biological and medical communities for cell studies, tissue generation, and regenerative medicine.

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Zong, Hua, He Zhang e Jinghui Qiu. "Accurate Imaging of Wide Beam Active Millimeter Wave Based on Angular Spectrum Theory and Simulation Verification". Photonics 8, n. 9 (17 settembre 2021): 397. http://dx.doi.org/10.3390/photonics8090397.

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Due to the fact that a millimeter-wave (MMW) has a strong ability to penetrate clothing, MMW holographic imaging technology can conduct a non-contact inspection of the human body’s surface. In recent years, personnel surveillance systems utilizing MMW holographic imaging technology has achieved rapid progress. However, limited by MMW holographic imaging’s image quality, the existing imaging technology cannot accurately detect whether the human body carries hidden objects. Additionally, real-time inspection requirements cannot be practically satisfied, and the system cost is relatively high. In this paper, a reconstruction algorithm with enhanced imaging quality, which can solve the problem of spherical wave attenuation with distance, making imaging results more accurate. The sampling conditions and imaging resolution are simulated and analyzed, which verify the azimuth resolution. Furthermore, the antenna beam’s holographic imaging simulation is optimized, effectively improving the quality of the reconstructed image. The proposed scheme provides theoretical support for determining antenna step and scanning aperture size in engineering and have theoretical guiding significance for improving the image quality of millimeter-wave holography and reducing system cost.

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Harada, Ken, Yoshimasa A. Ono e Yoshio Takahashi. "Lensless Fourier transform electron holography applied to vortex beam analysis". Microscopy 69, n. 3 (25 marzo 2020): 176–82. http://dx.doi.org/10.1093/jmicro/dfaa008.

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Abstract Lensless Fourier transform holography has been developed. By treating Bragg diffraction waves as object waves and a transmitted spherical wave as a reference wave, these two waves are interfered and recorded as holograms away from the reciprocal plane. In this method, reconstruction of holograms requires only one Fourier transform. Application of this method to analyze vortex beams worked well and their amplitude and phase distributions were obtained on the reciprocal plane. By combining the conventional holography with the developed lensless Fourier transform holography, we can reconstruct and analyze electron waves from the real to reciprocal space continuously.

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Teo, Tat-Jin, e John M. Reid. "Multifrequency Holography Using Backpropagation". Ultrasonic Imaging 8, n. 3 (luglio 1986): 213–24. http://dx.doi.org/10.1177/016173468600800305.

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The technique of wavefield backpropagation has been used quite extensively in the literature. We report on an analytical study of the resolution properties of this technique. Backpropagation as a form of holographic reconstruction suffers from poor axial resolution. We derive expressions for both the axial and the lateral resolutions. We also show that the axial resolution can be substantially improved by the use of multiple frequencies. We derive an expression relating the resolution and bandwidth.

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Teo, T. "Multifrequency holography using backpropagation". Ultrasonic Imaging 8, n. 3 (luglio 1986): 213–24. http://dx.doi.org/10.1016/0161-7346(86)90010-6.

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Bove, V. Michael, e Nicole A. Reader. "Holography and the Luxury Industry". Photonics 8, n. 6 (13 giugno 2021): 219. http://dx.doi.org/10.3390/photonics8060219.

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The luxury goods industry and holography have a lengthy history together. In this article, we review the applications of holography to the industry and the relevant technical requirements, in particular when the hologram itself is the luxury item, when the hologram is used to promote luxury items, and when the hologram is used for authentication of luxury items. We then explore some possible scenarios for the evolution of this relationship.

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Zheng, Huadong, Jianbin Hu, Chaojun Zhou e Xiaoxi Wang. "Computing 3D Phase-Type Holograms Based on Deep Learning Method". Photonics 8, n. 7 (15 luglio 2021): 280. http://dx.doi.org/10.3390/photonics8070280.

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Computer holography is a technology that use a mathematical model of optical holography to generate digital holograms. It has wide and promising applications in various areas, especially holographic display. However, traditional computational algorithms for generation of phase-type holograms based on iterative optimization have a built-in tradeoff between the calculating speed and accuracy, which severely limits the performance of computational holograms in advanced applications. Recently, several deep learning based computational methods for generating holograms have gained more and more attention. In this paper, a convolutional neural network for generation of multi-plane holograms and its training strategy is proposed using a multi-plane iterative angular spectrum algorithm (ASM). The well-trained network indicates an excellent ability to generate phase-only holograms for multi-plane input images and to reconstruct correct images in the corresponding depth plane. Numerical simulations and optical reconstructions show that the accuracy of this method is almost the same with traditional iterative methods but the computational time decreases dramatically. The result images show a high quality through analysis of the image performance indicators, e.g., peak signal-to-noise ratio (PSNR), structural similarity (SSIM) and contrast ratio. Finally, the effectiveness of the proposed method is verified through experimental investigations.

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von Bally, G., D. Vukicevic, N. Demoli, H. Bjelkhagen, G. Wernicke, U. Dahms, H. Gruber e W. Sommerfeld. "Holography and holographic pattern recognition for preservation and evaluation of cultural-historic sources". Naturwissenschaften 81, n. 12 (dicembre 1994): 563–65. http://dx.doi.org/10.1007/bf01140009.

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von Bally, G., D. Vukicevic, N. Demoli, H. Bjelkhagen, G. Wernicke, U. Dahms, H. Gruber e W. Sommerfeld. "Holography and Holographic Pattern Recognition for Preservation and Evaluation of Cultural-Historic Sources". Naturwissenschaften 81, n. 12 (1 dicembre 1994): 563–65. http://dx.doi.org/10.1007/s001140050131.

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Potcoava, Mariana, Jonathan Art, Simon Alford e Christopher Mann. "Deformation Measurements of Neuronal Excitability Using Incoherent Holography Lattice Light-Sheet Microscopy (IHLLS)". Photonics 8, n. 9 (9 settembre 2021): 383. http://dx.doi.org/10.3390/photonics8090383.

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Stimuli to excitable cells and various cellular processes can cause cell surface deformations; for example, when excitable cell membrane potentials are altered during action potentials. However, these cellular changes may be at or below the diffraction limit (in dendrites the structures measured are as small as 1 µm), and imaging by traditional methods is challenging. Using dual lenses incoherent holography lattice light-sheet (IHLLS-2L) detection with holographic phase imaging of selective fluorescent markers, we can extract the full-field cellular morphology or structural changes of the object’s phase in response to external stimulus. This approach will open many new possibilities in imaging neuronal activity and, overall, in light sheet imaging. In this paper, we present IHLLS-2L as a well-suited technique for quantifying cell membrane deformation in neurons without the actuation of a sample stage or detection microscope objective.

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Woodcock, B. H. "Optical Holography: Principles, Techniques and Applications". Physics Bulletin 36, n. 4 (aprile 1985): 178. http://dx.doi.org/10.1088/0031-9112/36/4/047.

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Harada, Ken, Kodai Niitsu, Keiko Shimada, Tetsuji Kodama, Tetsuya Akashi, Yoshimasa A. Ono, Daisuke Shindo, Hiroyuki Shinada e Shigeo Mori. "Electron holography on Fraunhofer diffraction". Microscopy 68, n. 3 (12 marzo 2019): 254–60. http://dx.doi.org/10.1093/jmicro/dfz007.

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Smalley, Daniel E., Sundeep Jolly, Gregg E. Favalora e Michael G. Moebius. "Status of Leaky Mode Holography". Photonics 8, n. 8 (21 luglio 2021): 292. http://dx.doi.org/10.3390/photonics8080292.

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It will soon be a decade since leaky mode waveguide devices were presented as a solution for holographic video displays. This paper seeks to provide a brief, topical review of advances made during that time. Specifically, we review the new methods and architectures that have been developed over this period. This work draws primarily from papers seeking to present dynamic holographic patterns using mode coupling from indiffused waveguides on lithium niobate. The primary participants during this time period have been groups from the Massachusetts Institute of Technology, Brigham Young University, and Draper. We also describe the challenges that remain. The body of work reviewed speaks to the need for further development, but it also reaffirms that leaky mode waveguides continue to hold a unique place within spatial light modulation for holographic video displays.

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Stevens, Gregory B., Michael Krüger, Tatiana Latychevskaia, Peter Lindner, Andreas Plückthun e Hans-Werner Fink. "Individual filamentous phage imaged by electron holography". European Biophysics Journal 40, n. 10 (27 agosto 2011): 1197–201. http://dx.doi.org/10.1007/s00249-011-0743-y.

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Teo, T. "Reconstruction in acoustical holography and backpropagation". Ultrasonic Imaging 8, n. 1 (gennaio 1986): 42. http://dx.doi.org/10.1016/0161-7346(86)90034-9.

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VANNAN, MANI A., NATESA G. PANDIAN, MICHAEL N. DALTON, STEVEN L. SCHWARTZ, BERNHARD MUMM e QI-LING CAO. "Volumetric Holography of Cardiac Defects in Humans." Echocardiography 15, n. 3 (aprile 1998): 233–38. http://dx.doi.org/10.1111/j.1540-8175.1998.tb00601.x.

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Boone, P. M. "Optical Methods To Measure Shape and Size". Advances in Dental Research 1, n. 1 (dicembre 1987): 27–38. http://dx.doi.org/10.1177/08959374870010010801.

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A number of methods are available to quantify exterior size and shape of living and non-living objects. Relevant items for dentistry are the exterior of face and skull and the surface of dental casts. To the best of our knowledge, dentitions have not yet been measured in situ. The optical methods using incoherent light are mechanical sensing of casts, visual stereometry (on the subject or on stereophotographic pairs), moire techniques, and optical-sensor morphometry. It will be shown that the three latter systems in fact rely on the same physical principles, although they involve quite different technologies. On the other hand, coherent optical techniques, such as holography and contouring holographic interferometry, are presented. The basic principles of the different techniques are shown, and their main features in relation to applications to the dental object discussed. Main features include: resolving power, range, time needed for a measurement, requirements for the surface of the object, and ease of selection and collection of data. Examples of methods from the literature and from work by the author are given.

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Fujioka, Mutsuhisa, Nagaaki Ohyama, Takao Honda, Junpei Tsujiuchi, Masane Suzuki, Shozo Hashimoto e Shigeto Ikeda. "Holography of 3D Surface Reconstructed CT Images". Journal of Computer Assisted Tomography 12, n. 1 (gennaio 1988): 175–78. http://dx.doi.org/10.1097/00004728-198801000-00041.

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KREUZER, H. J., H. W. FINK, H. SCHMID e S. BONEV. "Holography of holes, with electrons and photons". Journal of Microscopy 178, n. 3 (giugno 1995): 191–97. http://dx.doi.org/10.1111/j.1365-2818.1995.tb03597.x.

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TONOMURA, A. "Past, present and future of electron holography". Journal of Microscopy 179, n. 2 (agosto 1995): 105–11. http://dx.doi.org/10.1111/j.1365-2818.1995.tb03619.x.

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Coin, Gene, Ray Schulz, Gary Geil, Stephen Hart e Judie Felber. "HELICAL COMPUTED TOMOGRAPHIC HOLOGRAPHY (HCTH) IN PELVIC TRAUMA". Southern Medical Journal 88 (ottobre 1995): S146. http://dx.doi.org/10.1097/00007611-199510001-00342.

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de Haller, Emmanual B., Gert von Bally e Christian Depeursinge. "High-resolution holography and biopsy: Preliminary results". Bioimaging 3, n. 2 (giugno 1995): 76–87. http://dx.doi.org/10.1002/1361-6374(199506)3:2<76::aid-bio4>3.0.co;2-b.

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de Haller, Emmanual B., Gert von Bally e Christian Depeursinge. "High‐resolution holography and biopsy: Preliminary results". Bioimaging 3, n. 2 (giugno 1995): 76–87. http://dx.doi.org/10.1002/1361-6374(199506)3:2<76::aid-bio4>3.3.co;2-2.

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Magara, Hideyuki, Takeshi Tomita, Yukihito Kondo, Takafumi Sato, Zentaro Akase e Daisuke Shindo. "Development of a secondary electron energy analyzer for a transmission electron microscope". Microscopy 67, n. 2 (23 gennaio 2018): 121–24. http://dx.doi.org/10.1093/jmicro/dfx126.

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Abstract A secondary electron (SE) energy analyzer was developed for a transmission electron microscope. The analyzer comprises a microchannel plate (MCP) for detecting electrons, a coil for collecting SEs emitted from the specimen, a tube for reducing the number of backscattered electrons incident on the MCP, and a retarding mesh for selecting the energy of SEs incident on the MCP. The detection of the SEs associated with charging phenomena around a charged specimen was attempted by performing electron holography and SE spectroscopy using the energy analyzer. The results suggest that it is possible to obtain the energy spectra of SEs using the analyzer and the charging states of a specimen by electron holography simultaneously.

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Campos, Pedro, Kapil Sugand e Kamran Mirza. "Holography in clinical anatomy education: A systematic review". International Journal of Surgery 11, n. 8 (ottobre 2013): 706. http://dx.doi.org/10.1016/j.ijsu.2013.06.637.

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Thomas, John Meurig, Edward T. Simpson, Takeshi Kasama e Rafal E. Dunin-Borkowski. "Electron Holography for the Study of Magnetic Nanomaterials". Accounts of Chemical Research 41, n. 5 (maggio 2008): 665–74. http://dx.doi.org/10.1021/ar700225v.

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Stroke, George W. "The Dramatic Change from Empirical to Scientific Technology in Medicine: Computerized Imaging, Communications and Holography." Keio Journal of Medicine 42, n. 2 (1993): 70–77. http://dx.doi.org/10.2302/kjm.42.70.

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Robertson, Douglas D., Charles J. Sutherland, Brandon W. Chan, Jacqueline C. Hodge, William W. Scott e Elliot K. Fishman. "Depiction of Pelvic Fractures Using 3D Volumetric Holography". Journal of Computer Assisted Tomography 19, n. 6 (novembre 1995): 967–74. http://dx.doi.org/10.1097/00004728-199511000-00024.

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SHUNDO, HIDEO, TOSHIAKI MIYACHI, NORIHIKO TAKEUCHI, MASASHI ISHIHARA, YASUHIKO SHIBATA, HIROMICHI IWATA, MICHIMASA MATSUO, JIRO NAGANAWA, TAKUZO FUJITA e SHIGERU HARA. "THREE-DIMENTIONAL DISPLAY OF NUCLEAR IMAGES USING MULTIPLEX HOLOGRAPHY". Japanese Journal of Radiological Technology 44, n. 1 (1988): 1–9. http://dx.doi.org/10.6009/jjrt.kj00001361964.

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Beynon, T. D. "Neutron Holography: A new way of looking into matter". Physics Bulletin 37, n. 3 (marzo 1986): 128–31. http://dx.doi.org/10.1088/0031-9112/37/3/029.

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Riva, Giuseppe. "HoloMedical3D: Connecting the Dots for Medical Holography". Cyberpsychology, Behavior, and Social Networking 20, n. 9 (settembre 2017): 582–83. http://dx.doi.org/10.1089/cyber.2017.29085.ceu.

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Riva, Giuseppe. "HoloMedical3D: Connecting the Dots for Medical Holography". Cyberpsychology, Behavior, and Social Networking 21, n. 11 (novembre 2018): 737–38. http://dx.doi.org/10.1089/cyber.2018.29131.ceu.

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Li, Wei, Jianhui Zhang e Takayoshi Tanji. "Image processing for phase imperfections in electron holography". Microscopy 62, n. 6 (9 giugno 2013): 583–88. http://dx.doi.org/10.1093/jmicro/dft034.

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Nakamura, Yuichi. "Magnetic Holography and Its Application to Data Storage". Photonics 8, n. 6 (25 maggio 2021): 187. http://dx.doi.org/10.3390/photonics8060187.

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The principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect. To achieve a bright reconstruction image, it is important to record deep magnetic fringes on the materials with large Faraday rotation coefficients. This technique was applied to the holographic memory using transparent magnetic garnets as a recording material. The first reconstruction image was dark and noisy, but improvements in the recording conditions resulted in error-free recording and reconstruction of the magnetic hologram. To form deep magnetic fringes, insertion of heat dissipation (HD) layers into recording layer was proposed. It was found that this HD multilayer medium showed diffraction efficiency higher than that of a single layer medium, and error-free recording and reconstruction were also achieved, using magnetic assisted recording. These results suggest that HD multilayer media have potential applications in recording media of magnetic holographic data storage. In future, a high recording density technique, such as multiple recording, should be developed.

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Anand, Vijayakumar, Joseph Rosen, Soon Hock Ng, Tomas Katkus, Denver P. Linklater, Elena P. Ivanova e Saulius Juodkazis. "Edge and Contrast Enhancement Using Spatially Incoherent Correlation Holography Techniques". Photonics 8, n. 6 (16 giugno 2021): 224. http://dx.doi.org/10.3390/photonics8060224.

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Abstract (sommario):

Image enhancement techniques (such as edge and contrast enhancement) are essential for many imaging applications. In incoherent holography techniques such as Fresnel incoherent correlation holography (FINCH), the light from an object is split into two, each of which is modulated differently from one another by two different quadratic phase functions and coherently interfered to generate the hologram. The hologram can be reconstructed via a numerical backpropagation. The edge enhancement procedure in FINCH requires the modulation of one of the beams by a spiral phase element and, upon reconstruction, edge-enhanced images are obtained. An optical technique for edge enhancement in coded aperture imaging (CAI) techniques that does not involve two-beam interference has not been established yet. In this study, we propose and demonstrate an iterative algorithm that can yield from the experimentally recorded point spread function (PSF), a synthetic PSF that can generate edge-enhanced reconstructions when processed with the object hologram. The edge-enhanced reconstructions are subtracted from the original reconstructions to obtain contrast enhancement. The technique has been demonstrated on FINCH and CAI methods with different spectral conditions.

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47

Korchemskaya, Elena, Nikolai Burykin, Angel de Lera, Rosana Alvarez, Sergey Pirutin e Anna Druzhko. "14-Fluoro-Bacteriorhodopsin Gelatin Films for Dynamic Holography Recording¶". Photochemistry and Photobiology 81, n. 4 (2005): 920. http://dx.doi.org/10.1562/2004-12-24-ra-405r.1.

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48

Korchemskaya, Elena, Nikolai Burykin, Angel Lera, Rosana Alvarez, Sergey Pirutin e Anna Druzhko. "14-Fluoro-Bacteriorhodopsin Gelation Films for Dynamic Holography Recording¶". Photochemistry and Photobiology 81, n. 4 (30 aprile 2007): 920–23. http://dx.doi.org/10.1111/j.1751-1097.2005.tb01463.x.

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49

Vannan, Mani A., Qi-Ling Cao, Natesa G. Pandian, Lissa Sugeng, Steven L. Schwartz e Michael N. Dalton. "Volumetric multiplexed transmission holography of the heart with echocardiographic data". Journal of the American Society of Echocardiography 8, n. 5 (settembre 1995): 567–75. http://dx.doi.org/10.1016/s0894-7317(05)80369-4.

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50

Tahara, Tatsuki, Xiangyu Quan, Reo Otani, Yasuhiro Takaki e Osamu Matoba. "Digital holography and its multidimensional imaging applications: a review". Microscopy 67, n. 2 (17 febbraio 2018): 55–67. http://dx.doi.org/10.1093/jmicro/dfy007.

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Articoli di riviste sul tema "Holography in medicine"

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