keyword
https://read.qxmd.com/read/38457549/observation-on-efficacy-and-underlying-mechanism-of-cheek-acupuncture-on-ovulation-induction-for-infertile-women-with-pcos-case-series
#21
JOURNAL ARTICLE
Yi Yang, Lihua Jin, Shasha Xu, Huijun Ye, Xi Luo, Ruilan Li, Yuebing Yue
RATIONALE: Polycystic ovary syndrome (PCOS) is the most common reproductive endocrine disorder among women of childbearing age and is the primary cause of anovulatory infertility, accounting for 70% to 80% of cases. Ovulation induction is the main treatment approach for infertile patients with PCOS. Commonly utilized medications for this purpose are clomiphene citrate (CC) and letrozole (LE). Clomiphene citrate administration results in an ovulation rate ranging from 60% to 85%, while the pregnancy rate is limited to 35% to 40%, and a further reduction is observed in live birth rates...
March 8, 2024: Medicine (Baltimore)
https://read.qxmd.com/read/38457327/probibr-fast-image-based-rendering-with-learned-probability-guided-sampling
#22
JOURNAL ARTICLE
Yuemei Zhou, Tao Yu, Zerong Zheng, Gaochang Wu, Guihua Zhao, Wenbo Jiang, Ying Fu, Yebin Liu
We present a general, fast, and practical solution for interpolating novel views of diverse real-world scenes given a sparse set of nearby views. Existing generic novel view synthesis methods rely on time-consuming scene geometry pre-computation or redundant sampling of the entire space for neural volumetric rendering, limiting the overall efficiency. Instead, we incorporate learned MVS priors into the neural volume rendering pipeline while improving the rendering efficiency by reducing sampling points under the guidance of depth probability distributions...
March 8, 2024: IEEE Transactions on Visualization and Computer Graphics
https://read.qxmd.com/read/38456592/dynamic-hyperspectral-holography-enabled-by-inverse-designed-metasurfaces-with-oblique-helicoidal-cholesterics
#23
JOURNAL ARTICLE
Joohoon Kim, Jun-Hyung Im, Sunae So, Yeongseon Choi, Hyunjung Kang, Bogyu Lim, Minjae Lee, Young-Ki Kim, Junsuk Rho
Metasurfaces are flat arrays of nanostructures that allow exquisite control of phase and amplitude of incident light. Although metasurfaces offer new active element for both fundamental science and applications, the challenge still remains to overcome their low information capacity and passive nature. Here, by integrating an inverse-designed-metasurface with oblique helicoidal cholesteric liquid crystal (ChOH ), we demonstrate simultaneous spatial and spectral tunable metasurfaces with a high information capacity for dynamic hyperspectral holography...
March 8, 2024: Advanced Materials
https://read.qxmd.com/read/38451178/photoelectron-holographic-study-for-atomic-site-occupancy-for-si-dopants-in-si-doped-%C3%AE%C2%BA-ga-2-o-3-001
#24
JOURNAL ARTICLE
Yuhua Tsai, Yusuke Hashimoto, ZeXu Sun, Takuya Moriki, Takashi Tadamura, Takahiro Nagata, Piero Mazzolini, Antonella Parisini, Matteo Bosi, Luca Seravalli, Tomohiro Matsushita, Yoshiyuki Yamashita
We investigated atomic site occupancy for the Si dopant in Si-doped κ-Ga2 O3 (001) using photoelectron spectroscopy (PES) and photoelectron holography (PEH). From PES and PEH, we found that the Si dopant had one chemical state, and three types of inequivalent Si substitutional sites (SiGa ) were formed. The ratios for the inequivalent tetrahedral, pentahedral, and octahedral SiGa sites were estimated to be 55.0%, 28.1%, and 16.9%, respectively. Higher (lower) ratios for the three inequivalent SiGa sites may come from a lower (higher) formation energy...
March 7, 2024: Nano Letters
https://read.qxmd.com/read/38450021/the-fear-of-spiders-perceptual-features-assessed-in-augmented-reality
#25
JOURNAL ARTICLE
Sergio Frumento, Paolo Frumento, Marco Laurino, Danilo Menicucci, Angelo Gemignani
BACKGROUND: Persons with specific phobias typically generalize the dangerousness of the phobic animal to all members of its species, possibly as a result of malfunctioning brain circuitry normally providing quick and dirty identification of evolutionary-relevant stimuli. An objective assessment of which perceptual features make an animal more or less scary to phobic and non-phobic people would help overcome the limitations of the few studies available so far, based on self-reports. OBJECTIVE: To achieve this aim, we built an augmented reality setting where volunteers with different levels of fear of spiders were asked to make holographic spiders that look either dangerous or harmless...
2024: Frontiers in Behavioral Neuroscience
https://read.qxmd.com/read/38448496/encoding-terahertz-holographic-bits-with-a-computer-generated-3d-printed-phase-plate
#26
JOURNAL ARTICLE
E Constable, J Gospodaric, A Pimenov
A sub-terahertz holographic image of a two-dimensional 576-bit data code is produced using a diffractive phase-plate element. The phase plate was designed using a modified Gerchberg-Saxton iterative algorithm to encode a focused image of the data code into a phase modulation profile. The complex phase plate structure is fabricated from polylactic acid using fused deposition modeling, a common three-dimensional-printing technique. The design achieves a significantly simplified optical setup, consisting of a 0...
March 6, 2024: Scientific Reports
https://read.qxmd.com/read/38445166/integration-of-augmented-reality-into-glioma-resection-surgery-a-case-report
#27
Rachel Hunt, Lisa Scarpace, Jack Rock
Augmented reality (AR) is an exciting technology that has garnered considerable attention in the field of neurosurgery. Despite this, clinical use of this technology is still in its infancy. An area of great potential for this technology is the ability to display 3D anatomy overlaid with the patient to assist with presurgical and intraoperative decision-making. A 39-year-old woman presented with headaches and was experiencing what was described as a whooshing sound. MRI revealed the presence of a large left frontal mass involving the genu of the corpus callosum, with heterogeneous enhancement and central hemorrhagic necrosis, confirmed to be a glioma...
February 2024: Curēus
https://read.qxmd.com/read/38445019/it-s-not-all-in-your-feet-improving-penalty-kick-performance-with-human-avatar-interaction-and-machine-learning
#28
JOURNAL ARTICLE
Jean-Luc Bloechle, Julien Audiffren, Thibaut Le Naour, Andrea Alli, Dylan Simoni, Gabriel Wüthrich, Jean-Pierre Bresciani
Penalty kicks are increasingly decisive in major international football competitions. Yet, over 30% of shootout kicks are missed. The outcome of the kick often relies on the ability of the penalty taker to exploit anticipatory movements of the goalkeeper to redirect the kick toward the open side of the goal. Unfortunately, this ability is difficult to train using classical methods. We used an augmented reality simulator displaying an holographic goalkeeper to test and train penalty kick performance with 13 young elite players...
March 4, 2024: The innovation
https://read.qxmd.com/read/38439502/general-phase-difference-imaging-of-incoherent-digital-holography
#29
JOURNAL ARTICLE
Wei Sheng, Youwen Liu, Yaoyao Shi
The hologram formed by incoherent holography based on self-interference should preserve the phase difference information of the object, such as the phase difference between the mutually orthogonal polarizations of anisotropic object. How to decode this phase difference from this incoherent hologram, i.e., phase-difference imaging, is of great significance for studying the properties of the measured object. However, there is no general phase-difference imaging theory due to both diverse incoherent holography systems and the complicated reconstruction process from holograms based on the diffraction theory...
February 26, 2024: Optics Express
https://read.qxmd.com/read/38439461/common-path-digital-holographic-microscopy-based-on-a-volume-holographic-grating-for-quantitative-phase-imaging
#30
JOURNAL ARTICLE
Chen-Ming Tsai, Sunil Vyas, Yuan Luo
Digital holographic microscopy (DHM) is a powerful quantitative phase imaging (QPI) technique that is capable of recording sample's phase information to enhance image contrast. In off-axis DHM, high-quality QPI images can be generated within a single recorded hologram, and the system stability can be enhanced by common-path configuration. Diffraction gratings are widely used components in common-path DHM systems; however, the presence of multiple diffraction beams leads to system power loss. Here, we propose and demonstrate implementation of a volume holographic grating (VHG) in common-path DHM, which provides single diffraction order...
February 26, 2024: Optics Express
https://read.qxmd.com/read/38439380/generating-airy-beams-through-multimode-fibres
#31
JOURNAL ARTICLE
Ivana Michálková, Simon Colombel, André D Gomes, Tomáš Čižmár
Focussing light through a multimode fibre (MMF) is the basis of holographic endoscopes, which currently enable detailed imaging of deep tissue. Achieving high fidelity and purity diffraction-limited foci has been shown to be possible, when fully controlling the amplitude, phase, and two orthogonal polarisation states of the input field. Yet, generating more complex field distributions with similar performance remains to be assessed. Here, we demonstrate the generation of Airy beams through an MMF containing in excess of 90 % of the optical power delivered by the fibre...
February 26, 2024: Optics Express
https://read.qxmd.com/read/38439304/holographic-imaging-of-antiferromagnetic-domains-with-in-situ-magnetic-field
#32
JOURNAL ARTICLE
Jack Harrison, Hariom Jani, Junxiong Hu, Manohar Lal, Jheng-Cyuan Lin, Horia Popescu, Jason Brown, Nicolas Jaouen, A Ariando, Paolo G Radaelli
Lensless coherent x-ray imaging techniques have great potential for high-resolution imaging of magnetic systems with a variety of in-situ perturbations. Despite many investigations of ferromagnets, extending these techniques to the study of other magnetic materials, primarily antiferromagnets, is lacking. Here, we demonstrate the first (to our knowledge) study of an antiferromagnet using holographic imaging through the 'holography with extended reference by autocorrelation linear differential operation' technique...
February 12, 2024: Optics Express
https://read.qxmd.com/read/38437429/point-cloud-holographic-encryption-display-system-involving-3d-face-recognition-and-air-writing
#33
JOURNAL ARTICLE
Jia-Hui Ji, Yu Zhao, Jing-Wen Bu, Tao Zhang, Li Ming Zhu, Yuan Huang
In this study, we proposed a holographic identity verification encryption system that integrates face recognition, air-writing, and the multiple point cloud gridding encryption (M-PCGE) method to ensure multi-level security for objects. The experimental results show that the M-PCGE algorithm proposed in this paper achieves image encryption and decryption quickly with a high degree of restoration, and the security is verified.
March 1, 2024: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://read.qxmd.com/read/38437419/effect-of-shrinkage-in-photopolymer-film-on-the-information-transmitted-through-the-holographic-waveguide-for-near-eye-displays
#34
JOURNAL ARTICLE
Rajveer Kaur, Jae-Hyeung Park, Raj Kumar
Due to shrinkage in photopolymer materials, the angle of the reconstruction beam in holographic optical elements (HOEs) does not match with the Bragg condition, resulting in a decreased amount of light in the desired direction or loss of transmitted information to rematch the Bragg condition. Thus, to ensure final display features it is imperative to precompensate the shrinkage effect. We derived simplified expressions for precompensation in recording geometries of required HOEs in holographic waveguide-based Maxwellian near eye displays...
March 1, 2024: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://read.qxmd.com/read/38437371/compact-multi-spectral-resolution-wynne-offner-imaging-spectrometer-with-a-long-slit
#35
JOURNAL ARTICLE
Xingyun Zhang, Yanhong Gao, Yiqun Ji, Anwei Feng, Shijia Zhao, Chinhua Wang
Current imaging spectrometers are developed towards a large field of view (FOV) as well as high resolution to obtain more spatial and spectral information. However, imaging spectrometers with a large FOV and high resolution produce a huge image data cube, which increases the difficulty of spectral data acquisition and processing. In practical applications, it is more reasonable and helpful to identify different targets within a large FOV with different spectral resolutions. In this paper, a compact multi-spectral-resolution Wynne-Offner imaging spectrometer with a long slit is proposed by introducing a special diffraction grating with multi-groove densities at different areas...
February 20, 2024: Applied Optics
https://read.qxmd.com/read/38437325/speckle-noise-suppression-method-in-a-holographic-display-based-on-pixel-processing
#36
JOURNAL ARTICLE
Su-Juan Liu, Shuai-Ze Kang, Long-Fei Feng, Kun Yang, Bo Zhang, Qin Liu, Di Wang
In this paper, we propose a method to suppress the speckle noise in a holographic display based on pixel processing. Through the separation of object pixels in space, the recorded object is divided into multiple object point groups. The complex amplitude of the light field for each object point group is recorded as a sub-computer-generated hologram (sub-CGH). The phase of each pixel on a sub-CGH is optimized to generate the final sub-CGH. Therefore, the pixels of the recorded object and sub-CGH are processed...
February 10, 2024: Applied Optics
https://read.qxmd.com/read/38437311/quality-improvement-to-holographic-microscopy-reconstruction-based-on-kramers-kronig-relations-and-phase-background-fitting
#37
JOURNAL ARTICLE
Kaiping Li, Ping Cai
Spectrum aliasing in off-axis digital holography may result in poor image reconstruction quality. This study proposes a method to eliminate the zero-order spectrum and enhance image quality based on Kramers-Kronig relations and phase background fitting. The Kramers-Kronig relations are employed to derive the quotient of the complex wavefront of object and the reference beam, and phase background fitting is performed in a compensatory way to yield the object complex wavefront. The effectiveness of the proposed approach is validated via simulations and experiments...
February 10, 2024: Applied Optics
https://read.qxmd.com/read/38437263/realistic-rendering-method-for-specular-reflections-with-continuous-motion-parallax-in-a-computer-generated-hologram
#38
JOURNAL ARTICLE
Keita Watanabe, Keigo Yamauchi, Yuji Sakamoto
A computer-generated hologram (CGH) enables the display of virtual images and videos as well as the communication and storage of holographic data. The point-based method, which is a CGH-calculation method for representing the surface of an object as a set of point-light sources, has not been sufficiently studied in terms of realistic representation. This paper proposes a CGH-calculation method for realistic rendering using ray tracing to be used with a point-based method. Experiments were conducted with an optical system to confirm the effectiveness of the proposed method in terms of hidden-surface removal in mirror images and its implementation on multiple mirror surfaces...
March 1, 2024: Applied Optics
https://read.qxmd.com/read/38437262/detectability-of-unresolved-particles-in-off-axis-digital-holographic-microscopy
#39
JOURNAL ARTICLE
Nikki Johnston, Megan Marie Dubay, Eugene Serabyn, Jay L Nadeau
Off-axis digital holographic microscopy (DHM) provides both amplitude and phase images, and so it may be used for label-free 3D tracking of micro- and nano-sized particles of different compositions, including biological cells, strongly absorbing particles, and strongly scattering particles. Contrast is provided by differences in either the real or imaginary parts of the refractive index (phase contrast and absorption) and/or by scattering. While numerous studies have focused on phase contrast and improving resolution in DHM, particularly axial resolution, absent have been studies quantifying the limits of detection for unresolved particles...
March 1, 2024: Applied Optics
https://read.qxmd.com/read/38437261/refocus-criterion-from-image-plane-speckle-correlation-in-digital-holographic-interferometry
#40
JOURNAL ARTICLE
Mikael Sjödahl, Pascal Picart
In digital holography and holographic interferometry, refocusing to the correct image plane can be challenging and may be obtained by various metrics. This paper proposes a digital refocus approach utilizing the linear relationship between in-plane speckle motion and defocus as a response to an induced phase gradient. The theory based on cross-correlations between pairs of intensity images reconstructed at different distances from the recording plane is discussed. Two simple metrics, based on the cross-correlation properties of the reconstructed speckle images, are proposed and evaluated utilizing both simulations and experiments...
March 1, 2024: Applied Optics
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