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Conference on Lasers and Electro-Optics

作者： Rao, Raghu Ambekar Ramachandra Menta, Monal R. Leithem, Scott Toussaint Jr., Kimani C. Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign IL 61820 United States Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign IL 61820 United States Departments of Electrical and Computer Engineering and Bioengineering University of Illinois Urbana-Champaign IL 61820 United States

We compare the forward and backward SHG images for porcine tendon, sclera, and ear cartilage using Fourier transform-second-harmonic generation microscopy. The preferred orientation and peaks in the magnitude spectrum... 详细信息

ISBN: (纸本)9781557528902

关键词： Harmonic generation

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HermesD: A high-rate long-range wireless transmission system for simultaneous multichannel neural recording applications

HermesD: A high-rate long-range wireless transmission system...

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作者： Miranda, Henrique Gilja, Vikash Chestek, Cindy A. Shenoy, Krishna V. Meng, Teresa H. Department of Electrical Engineering Stanford University Stanford CA 94305 United States Department of Computer Science Stanford University Stanford CA 94305 United States Departments of Electrical Engineering and Bioengineering Neurosciences Program Stanford University Stanford CA 94305 United States

HermesD is a high-rate, low-power wireless transmission system to aid research in neural prosthetic systems for motor disabilities and basic motor neuroscience. It is the third generation of our Hermes systems aimed at recording and transmitting neural activity from brain-implanted electrode arrays. This system supports the simultaneous transmission of 32 channels of broadband data sampled at 30 ks/s, 12 b/sample, using frequency-shift keying modulation on a carrier frequency adjustable from 3.7 to 4.1 GHz, with a link range extending over 20 m. The channel rate is 24 Mb/s and the bit stream includes synchronization and error detection mechanisms. The power consumption, approximately 142 mW, is low enough to allow the system to operate continuously for 33 h, using two 3.6-V/1200-mAh Li-SOCl2batteries. The transmitter was designed using off-the-shelf components and is assembled in a stack of three 28 mm × 28-mm boards that fit in a 38 mm × 38 mm × 51-mm aluminum enclosure, a significant size reduction over the initial version of HermesD. A 7-dBi circularly polarized patch antenna is used as the transmitter antenna, while on the receiver side, a 13-dBi circular horn antenna is employed. The advantages of using circularly polarized waves are analyzed and confirmed by indoor measurements. The receiver is a stand-alone device composed of several submodules and is interfaced to a computer for data acquisition and processing. It is based on the superheterodyne architecture and includes automatic frequency control that keeps it optimally tuned to the transmitter frequency. The HermesD communications performance is shown through bit-error rate measurements and eye-diagram plots. The sensitivity of the receiver is - 83 dBm for a bit-error probability of 10-9. Experimental recordings from a rhesus monkey conducting multiple tasks show a signal quality comparable to commercial acquisition systems, both in the low-frequency (local field potentials) and upper-frequency bands (act

关键词： Transmitters

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Fourier transform-second-harmonic generation imaging of collagen fibers in biological tissues

Fourier transform-second-harmonic generation imaging of coll...

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Biomedical Optics, BIOMED 2010

作者： Ambekar Ramachandra Rao, Raghu Mehta, Monal R. Leithem, Scott Toussaint Jr., Kimani C. Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign IL 61820 United States Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign IL 61820 United States Departments of Electrical and Computer Engineering and Bioengineering University of Illinois Urbana-Champaign IL 61820 United States

Fourier transform-second-harmonic generation imaging is presented to quantitatively describe the collagen fiber organization in biological tissues. Further, we use this technique to compare the information content in ... 详细信息

ISBN: (纸本)9781557528872

关键词： Harmonic generation

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Development of quantitative metrics for second-harmonic generation imaging of collagen-based structures

Development of quantitative metrics for second-harmonic gene...

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Frontiers in Optics, FiO 2010

作者： Rao, Raghu Ambekar Ramachandra Toussaint Jr., Kimani C. Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Departments of Electrical and Computer Engineering Bioengineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801 United States

We discuss the application of harmonic analysis in second-harmonic generation microscopy in developing useful quantitative metrics for assessing tissue morphology. A comparison between the information content in forwa... 详细信息

关键词： Harmonic generation

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DYNAMIC OPTICAL COHERENCE ELASTOGRAPHY:A REVIEW

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Journal of Innovative Optical Health Sciences 2010年第4期3卷 221-233页

作者： XING LIANG VASILICA CRECEA STEPHEN A.BOPPART Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801USA Department of Physics Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801USA Departments of Electrical and Computer Engineering Bioengineering and Internal MedicineBeckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801USA Biophotonics Imaging Laboratory Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801USA

With the development of optical coherence tomography,the application optical coherence elastography(OCE)has gained more and more attention in biomechanics for its unique features including micron-scale resolution,real-time processing,and non-invasive *** this review,one group of OCE techniques,namely dynamic OCE,are introduced and discussed including external dynamic OCE mapping and imaging of ex vivo breast tumor,external dynamic OCE measurement of in vivo human skin,and internal dynamic OCE including acoustomotive OCE and magnetomotive *** techniques overcame some of the major drawbacks of traditional static OCE,and broadened the OCE application *** by scientific needs to engineer new quantitative methods that utilize the high micron-scale resolution achievable with optics,results of biomechanical properties were obtained from biological *** results suggest potential diagnostic and therapeutic clinical *** from these studies also help our understanding of the relationship between biomechanical variations and functional tissue changes in biological systems.

关键词： Optical coherence tomography optical coherence elastography biomechanics tissue characterization scattering phase measurements

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Automatic detection of dining plates for image-based dietary evaluation

Automatic detection of dining plates for image-based dietary...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Jie Nie Zhiqiang Wei Wenyan Jia Lu Li John D. Fernstrom Robert J. Sclabassi Mingui Sun Departments of Neurosurgery Electrical Engineering Bioengineering University of Pittsburgh USA Department of Computer Science Ocean University of China Qingdao China

An automatic detector that finds circular dining plates in chronically recorded images or videos is reported for the study of food intake and obesity. We first detect edges from input images. After a number of processing steps that convert edges into curves, arc filtering and grouping algorithms are applied. Then, convex hulls are identified and the ones that fit the description of ellipses corresponding to dining plates are determined. Our experiments using real-world images indicate that this detector is highly reliable and robust even when the input images contain complex background scenes and the dining plates are severely occluded.

关键词： Image edge detection Pixel Clutter Filtering Fitting Shape Transforms

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Application of a minimum probability of error classifier with Linear Time-Varying pre-filters for buried target recognition

Application of a minimum probability of error classifier wit...

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OCEANS

作者： Brandon Hamschin Patrick Loughlin Department of Electrical & Computer Engineering University of Pittsburgh Pittsburgh PA USA Departments of Bioengineering and ECE University of Pittsburgh Pittsburgh PA USA

ISBN: (纸本)9781424443321

In this paper we overview the theory of Linear Time-Varying (LTV) filters and investigate via simulation their application to buried target classification in challenging nonstationary environments; in particular, environments where noise is not only nonstationary but exhibits statistical properties that are not known a priori. We then propose an extension of the Minimum Probability of Error (MPE) classifier (a/k/a Minimum Distance Receiver) by pre-processing the received data through a bank of LTV filters before the calculation of each test statistic via the MPE classifier. The proposed augmented MPE classifier is shown to outperform the conventional MPE classifier via simulation.

关键词： Interference Sediments Signal to noise ratio Eigenvalues and eigenfunctions Time frequency analysis Backscatter

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The design and realization of a wearable embedded device for dietary and physical activity monitoring

The design and realization of a wearable embedded device for...

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International Symposium on Systems and Control in Aerospace and Astronautics (ISSCAA)

作者： Hong Zhang Yuecheng Li Steven A. Hackworth Yaofeng Yue Chengliu Li Guifang Yan Mingui Sun Image and Pattern Recognition Laboratory School of Astronautics Beihang University China Department of Electrical and Computer Engineering University of Pittsburgh USA Departments of Neurosurgery Electrical and Computer Engineering and Bioengineering University of Pittsburgh PA USA

This paper introduces the design and realization of a wearable device for dietary and physical activity monitoring. This design is based on technological advances in microelectronics and our previous prototypes which have verified the system concept. From our results, it is shown that the device meets all functional requirements as well as size and power consumption constraints essential to participants' use. With further technological development, we believe that the size of the system can be reduced and accurate and objective dietary assessments will become possible.

关键词： Cameras Monitoring Transform coding Batteries Debugging Linux Vibrations

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π -phase cylindrical vector beams in optical tweezers

π -phase cylindrical vector beams in optical tweezers

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Frontiers in Optics, FiO 2010

作者： Roxworthy, Brian J. Toussaint, Kimani C. Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Departments of Electrical and Computer Engineering and Bioengineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801 United States

The use of π -phase cylindrical vector beams in optical trapping is investigated. We find that tuning the relative phase between the eigenmodes comprising the beams can optimize the axial trapping forces. © 2010... 详细信息

关键词： Azimuthally polarized beams Cylindrical vector beams Light beams Optical trapping Optical tweezers Vector beams Lasers and laser optics (140.0140) Laser trapping (140.7010) Physical optics (260.0260) Polarization (260.5430)

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The relationship between behavioural microsleeps, visuomotor performance and EEG theta

The relationship between behavioural microsleeps, visuomotor...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Govinda R. Poudel Carrie R. H. Innes Philip J. Bones Richard D. Jones Department of Medical Physics and Bioengineering Christchurch Hospital New Zealand Department of Electrical and Computer Engineering University of Canterbury New Zealand Departments of Electrical & Computer Engineering and Psychology University of Canterbury Christchurch New Zealand Department of Medical Physics and Bioengineering Christchurch Hospital University of Otago New Zealand

Visuomotor performance and responsiveness deteriorates with time-on-task due to drowsiness and increased propensity to sleep. Frequent episodes of behavioural microsleep (BM) are also common during extended and monotonous tasks. In this study, simultaneous recording of EEG, eye-video, and continuous visuomotor response is used to investigate visuomotor performance and EEG activity during tonic drowsiness and phasic BMs. The data were collected from 20 healthy volunteers while they performed a continuous 2-D pursuit tracking task for 50 min. We identified episodes of BMs by expert visual rating of eye-video and visuomotor response using a set of pre-defined criteria. Visuomotor performance and EEG activity were correlated with and without BM events. A moderate correlation was observed between visuomotor error and theta activity in EEG at a posterior channel (Pz) before the removal of BMs. However, when BMs were removed from the data, the correlation dropped in most subjects. Furthermore, most of the large fluctuations in performance observed during the visuomotor task disappeared after the removal of BMs. This suggests that episodic behaviours such as BMs contribute substantially to fluctuations in performance and to EEG theta activity during an extended task, and that they should be taken into account when studying tonic drowsiness.

关键词： Electroencephalography Correlation Fluctuations Sleep Target tracking Magnetic resonance imaging Electrooculography

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