نتایج جستجو برای: optical imaging system

تعداد نتایج: 2807792  

Journal: :Journal of biomedical optics 2010
Wanrong Gao

The significance of beam condition for scattered light from random tissue is analyzed for a practical optical imaging system with a finite numerical aperture. It is shown that in the transmitted illumination case, the information carrying part of the spectrum of the scattered light is proportional to the square of the spatial frequency of the spatial correlation function of the scattering poten...

Journal: :Optics express 2013
Wei-Cheng Kuo Yuan-Ta Shih Hsun-Chia Hsu Yu-Hsiang Cheng Yi-Hua Liao Chi-Kuang Sun

High spatial and temporal resolutions are important advantages of optical imaging over other modalities. The recently developed spatial overlap modulation (SPOM) microscopy enables high resolution imaging by spatial modulation of double-beam overlap. However, SPOM suffers from bad temporal resolution and high system complexity. In this paper, we re-formulate the SPOM resolution theory and devel...

2011
Victor Shia David Watt Gregory W. Faris

We describe a high-speed camera system for frequency domain imaging suitable for applications such as in vivo diffuse optical imaging and fluorescence lifetime imaging. 14-bit images are acquired at 2 gigapixels per second and analyzed with real-time pipeline processing using field programmable gate arrays (FPGAs). Performance of the camera system has been tested both for RF-modulated laser ima...

Journal: :Optics letters 2004
Vesselin Shaoulov Ricardo Martins Jannick P Rolland

An ultracompact optical imaging system allowing various magnifications or demagnifications and based on microlenslet arrays is presented for the first time to our knowledge. This research generalizes recent findings regarding microlenslet-array-based 1:1 relay systems [Appl. Opt. 42, 6838 (2003)]. Through optical ray tracing, the feasibility of magnifying gray-scale images through a stack of tw...

Journal: :Journal of magnetic resonance imaging : JMRI 2001
E Vahala M Ylihautala J Tuominen H Schiffbauer J Katisko S Yrjänä T Vaara G Ehnholm J Koivukangas

Performing interventional procedures in the close proximity to an MR scanner widens the range of operations available for an optical tracking system. In order to gain the full benefits from both unrestricted use of surgical instruments outside the magnet and intraoperative imaging, a method for transferring the registration data of the optical navigator between two locations is required. An opt...

Journal: :Optics express 2014
Nathan D Shemonski Adeel Ahmad Steven G Adie Yuan-Zhi Liu Fredrick A South P Scott Carney Stephen A Boppart

Stability is of utmost importance to a wide range of phase-sensitive processing techniques. In Doppler optical coherence tomography and optical coherence elastography, in addition to defocus and aberration correction techniques such as interferometric synthetic aperture microscopy and computational/digital adaptive optics, a precise understanding of the system and sample stability helps to guid...

ژورنال: سنجش و ایمنی پرتو 2020

with the advancement of nanotechnology, high-atomic materials such as gold nanoparticles can be used to increase the amount of absorbed doses and use this property to eliminate cancer cells. In this study, the dose enhancement factor (DEF) derived from different concentrations of gold nanoparticles was calculated to show an increase in absorbed dose from gold nanoparticles. At first, a tissue e...

2005
Joseph Rosen

We survey recently invented methods of optical tomographic imaging through scattering medium. The threedimensional structure of an object hidden between two biological tissues is recovered from many noisy speckle pictures obtained on the output of a multi-channeled optical imaging system.

2013
Hao Yang Lei Xi Sean Samuelson Huikai Xie Lily Yang Huabei Jiang

We describe a novel dual-modality imaging approach that integrates diffuse optical tomography (DOT) and photoacoustic imaging (PAI) through a miniaturized handheld probe based on microelectromechanical systems (MEMS) scanning mirror. We validate this dual-modal DOT/PAI approach using extensive phantom experiments, and demonstrate its application for tumor imaging using tumor-bearing mice system...

2010
Taemn Kim Byoung-Kwan Cho

Based on a fluorescence imaging model, the optical filters, such as excitation and emission filters, are determined by linear discriminant analysis. The discriminability is a quadratic Rayleigh quotient of one filter if the other filter is assumed to be constant. The optical filters are optimized alternatingly and iteratively by solving their generalized eigenvalue problems. The proposed method...

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