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  • IEEE Xplore  (14)
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  • 1
    Language: English
    In: IEEE transactions on medical imaging, February 2010, Vol.29(2), pp.465-73
    Description: A hybrid imaging system for simultaneous fluorescence tomography and X-ray computed tomography (XCT) of small animals has been developed and presented. The system capitalizes on the imaging power of a 360 ( degrees )-projection free-space fluorescence tomography system, implemented within a microcomputed tomography scanner. Image acquisition is based on techniques that automatically adjust a series of imaging parameters to offer a high dynamic range dataset. Image segmentation further allows the incorporation of structural priors in the optical reconstruction problem to improve the imaging performance. The functional system characteristics are showcased, and images from a brain imaging study are shown, which are reconstructed using XCT-derived priors into the optical forward problem.
    Keywords: Image Processing, Computer-Assisted -- Methods ; X-Ray Microtomography -- Methods
    ISSN: 02780062
    E-ISSN: 1558-254X
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  • 2
    Language: English
    In: IEEE transactions on medical imaging, April 2004, Vol.23(4), pp.492-500
    Description: Noncontact optical measurements from diffuse media could facilitate the use of large detector arrays at multiple angles that are well suited for diffuse optical tomography applications. Such imaging strategy could eliminate the need for individual fibers in contact with tissue, restricted geometries, and matching fluids. Thus, it could significantly improve experimental procedures and enhance our ability to visualize functional and molecular processes in vivo. In this paper, we describe the experimental implementation of this novel concept and demonstrate capacity to perform small animal imaging.
    Keywords: Algorithms ; Esophagus -- Anatomy & Histology ; Image Interpretation, Computer-Assisted -- Methods ; Imaging, Three-Dimensional -- Methods ; Microscopy, Fluorescence -- Instrumentation ; Tomography -- Instrumentation
    ISSN: 0278-0062
    E-ISSN: 1558254X
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  • 3
    Language: English
    In: IEEE Transactions on Nuclear Science, Oct, 2007, Vol.54(5), p.1553(8)
    Description: Herein, we present a novel concept for fully integrated dual-modality in vivo tomographic imaging yielding simultaneous detection of positron and optically labeled probes in small animals. The imager consists of an allocation of optical detector modules and, in radial extension, the allocation of positron emission detector modules. Laser scanning and large-field light sources are integrated to facilitate fluorescence imaging in addition to bioluminescence imaging. Each optical detector unit consists of a large-area photon sensor for light detection, a microlens array for field-of-view definition, a septum mask for cross-talk suppression, and a transferable filter for wavelength selection. To prove the working principle of the dual-modality detector system a pair of optical detectors along with a large-field excitation source was placed inside the bore of a Siemens EXACT HR+ scanner, performing simultaneous imaging. The imaging characteristics of the optical detector were evaluated experimentally using a prototypical setup with geometrical phantoms. The sensitivity of the optical detector prototype was found less than that of a reference CCD camera. We propose several ways of increasing optical detector sensitivity. Index Terms--Dual-modality imaging, optical imaging, positron emission tomography, small animal imaging.
    Keywords: Image Processing Equipment -- Design And Construction ; Positron Emission Tomography -- Equipment And Supplies
    ISSN: 0018-9499
    E-ISSN: 15581578
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  • 4
    Language: English
    In: 2009 Asia Communications and Photonics conference and Exhibition (ACP), November 2009, pp.1-2
    Description: Fluorescence tomography can resolve fluorescence biodistribution in vivo with high sensitivity. We use structural information from X-ray CT as priors in the fluorescence reconstruction for improved accuracy, as shown previously [1]. The method was tested on different phantoms and animal models and cross-validated with XCT data, histology and ex vivo fluorescence.
    Keywords: Fluorescence ; Image Reconstruction ; Biomedical Optical Imaging ; Optical Imaging ; Biomedical Imaging ; Computed Tomography ; Animals ; X-Ray Imaging ; Optical Sensors ; In Vivo ; Engineering
    ISSN: 2162-108X
    E-ISSN: 2162-1098
    Source: IEEE Conference Publications
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines 
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  • 5
    Language: English
    In: 2013 IEEE 18th Conference on Emerging Technologies & Factory Automation (ETFA), September 2013, pp.1-7
    Description: Field devices belong to the primary assets of an industrial plant. From the perspective of plant asset management, Computerized Maintenance Management Systems (CMMS) and Device Management Systems (DMS) share some responsibility for the well-being of these devices. CMMS and DMS reside on the opposite ends of the automation pyramid, have very different scopes, and there are multiple CMMS vendors that a DCS vendor might decide to support. Also, for each customer plant, the device/asset bases for both systems must be connected. The main goal is to avoid media breaks and offer a seamless workflow for the DCS users. In this article, we show how Field Device Integration (FDI) technology can serve to achieve and extend the deep, seamless integration of current solutions [2] through loose, light-weight coupling of DCS and CMMS.
    Keywords: Maintenance Engineering ; Coordinate Measuring Machines ; Software ; Automation ; Monitoring ; Standards ; Companies
    ISSN: 1946-0740
    E-ISSN: 1946-0759
    Source: IEEE Conference Publications
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines 
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  • 6
    Language: English
    In: 2016 IEEE Information Theory Workshop (ITW), September 2016, pp.379-383
    Description: The large-system decoupling property of a MAP estimator is studied when it estimates the i.i.d. vector x from the observation y = Ax + z with A being chosen from a wide range of matrix ensembles, and the noise vector z being i.i.d. and Gaussian. Using the replica method, we show that the marginal joint distribution of any two corresponding input and output symbols converges to a deterministic distribution which describes the input-output distribution of a single user system followed by a MAP estimator. Under the bRSB assumption, the single user system is a scalar channel with additive noise where the noise term is given by the sum of an independent Gaussian random variable and b correlated interference terms. As the bRSB assumption reduces to RS, the interference terms vanish which results in the formerly studied RS decoupling principle.
    Keywords: Conferences ; Interference ; Additive Noise ; Glass ; Indexes ; Receivers ; Sensors
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  • 7
    Language: English
    In: 2017 Information Theory and Applications Workshop (ITA), February 2017, pp.1-7
    Description: For noisy compressive sensing systems, the asymptotic distortion with respect to an arbitrary distortion function is determined when a general class of least-square based reconstruction schemes is employed. The sampling matrix is considered to belong to a large ensemble of random matrices including i.i.d. and projector matrices, and the source vector is assumed to be i.i.d. with a desired distribution. We take a statistical mechanical approach by representing the asymptotic distortion as a macroscopic parameter of a spin glass and employing the replica method for the large-system analysis. In contrast to earlier studies, we evaluate the general replica ansatz which includes the RS ansatz as well as RSB. The generality of the solution enables us to study the impact of symmetry breaking. Our numerical investigations depict that for the reconstruction scheme with the "zero-norm" penalty function, the RS fails to predict the asymptotic distortion for relatively large compression rates; however, the one-step RSB ansatz gives a valid prediction of the performance within a larger regime of compression rates.
    Keywords: Compressed Sensing ; Precoding ; Correlation ; Additives ; Glass ; Sensors ; Lattices
    Source: IEEE Conference Publications
    Source: IEEE Xplore
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  • 8
    In: IEEE Transactions on Antennas and Propagation, 04/2013, Vol.61(4), pp.1631-1641
    Description: Polarimetric radio wave processing becomes of increasing interest for very high-data rate wireless transmission and for short-range radar at millimeter-waves (mm-W). This goes along with the huge bandwidth of 7 to 9 GHz, which is available worldwide in the 60 GHz unlicensed band. In this paper, we propose a 60 GHz ultra-wideband (UWB) polarimetric multiple-input-multiple-output (MIMO) sensing system architecture and polarimetric signal processing for short-range communications and radar. Demonstration measurements were made by using an UWB radar interface. By measurements in multipath rich environments it is demonstrated that tap-wise polarimetric filtering in delay domain can enhance the 60 GHz link budget by filtering some paths and then reducing shadowing due to human activity. Additionally, optimum MIMO polarimetric filtering is proposed to reduce heavy clutter for mm-W radar, increasing by about 30 dB the signal-to-clutter-plus-noise-ratio.
    Keywords: Shadow Mapping ; Radar Polarimetry ; Bandwidth ; Switches ; Mimo ; Filtering ; Channel Sounding ; Diversity ; Full Polarimetric Mimo ; Millimeter Waves ; Multi-Gigabit ; Polarimetric Filtering ; Polarimetric Clutter and Background Removal ; Polarimetric Target Detection and Classification ; Shadowing ; Ultra-Wideband Short-Range Radar ; 60 Ghz ; 802.11ad ; Engineering;
    ISSN: 0018-926X
    E-ISSN: 1558-2221
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  • 9
    Language: English
    In: 2017 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), November 2017, pp.1-4
    Description: In this paper we describe the architecture and design of a non-blocking 4×4 switch matrix module for mm-wave satellite communications, where flexible signal distribution becomes increasingly relevant. Following the successful on-orbit verification of a blocking 4×4 switch matrix for a reconfigurable Ka-band input multiplexer aboard the planned German Heinrich Hertz mission, the non-blocking switch matrix module offers relevant advantages in terms of signal routing and total power consumption. The non-blocking switch matrix utilizes hybrid-integrated precision laser-trimmed Wilkinson power splitters and low microwave-loss absorptive transistor-based SPST-switches.
    Keywords: Optical Switches ; Transmission Line Measurements ; Ports (Computers) ; Insertion Loss ; Switching Circuits ; Scattering Parameters ; Low-Temperature Co-Fired Ceramics ; Switch Matrix ; Reconfigurability ; Satellite Communications ; Ltcc
    Source: IEEE Conference Publications
    Source: IEEE Xplore
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  • 10
    Language: English
    In: IEEE Transactions on Information Theory, 23 August 2019, pp.1-1
    Description: The large-system performance of maximum-a-poste-rior estimation is studied considering a general distortion function when the observation vector is received through a linear system with additive white Gaussian noise. The analysis considers the system matrix to be chosen from the large class of rotationally invariant random matrices. We take a statistical mechanical approach by introducing a spin glass corresponding to the estimator, and employing the replica method for the large-system analysis. In contrast to earlier replica based studies, our analysis evaluates the general replica ansatz of the corresponding spin glass and determines the asymptotic distortion of the estimator for any structure of the replica correlation matrix. Consequently, the replica symmetric as well as the replica symmetry breaking ansatz with b steps of breaking is deduced from the given general replica ansatz. The generality of our distortion function lets us derive a more general form of the maximum-a-posterior decoupling principle. Based on the general replica ansatz, we show that for any structure of the replica correlation matrix, the vector-valued system decouples into a bank of equivalent decoupled scalar systems followed by maximum-a-posterior estimators. The structure of the decoupled system is further studied under both the replica symmetry and the replica symmetry breaking assumptions. For b steps of symmetry breaking, the decoupled system is found to be an additive system with a non-Gaussian noise term given as the sum of an independent Gaussian random variable with b non-Gaussian impairment terms which depend on the input symbol. The general decoupling property of the maximum-a-posterior estimator leads to the idea of a replica simulator which represents the replica ansatz through the state evolution of a transition system described by its corresponding decoupled system. As an application of our study, we investigate large compressive sensing systems by considering the ℓp norm minimization recovery schemes. Our numerical investigations show that the replica symmetric ansatz for ℓ0 norm recovery fails to give an accurate approximation of the mean square error as the compression rate grows, and therefore, the replica symmetry breaking ansätze are needed in order to assess the performance precisely.
    Keywords: Glass ; Distortion ; Thermodynamics ; Estimation ; Temperature Distribution ; Additives ; Random Variables ; Maximum-a-Posterior Estimation ; Linear Vector Channel ; Decoupling Principle ; Equivalent Single-User System ; Com-Pressive Sensing ; Zero Norm ; Replica Method ; Statistical Physics ; Replica Symmetry Breaking ; Replica Simulator ; Engineering ; Computer Science
    ISSN: 0018-9448
    E-ISSN: 1557-9654
    Source: IEEE Conference Publications
    Source: IEEE Journals & Magazines 
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines
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