4,980 research outputs found
Ken Friedenreich Interview
No full textThis interview is an oral history conducted by Linfield College student Camille Weber with Ken Friedenreich. The interview took place at the Jereld R. Nicholson Library at Linfield College on October 16, 2015.
Ken Friedenreich is an author who has written about Oregon wine and its history. The interview includes how he got interested in wine, what it\u27s like to write about wine for a living, the effects that prohibition had on Oregon, and advice for people new to wine
Frequency Domain Two-Stage Beamforming for Phased Array Imaging Using the Fast Hankel Transform
No full textThe huge amount of data that needs to be transferred between probe and imaging system becomes a major issue when the data transfer capacity is limited, e.g. in handheld systems, wireless probes and miniaturized probes. The amount of data can be significantly reduced by using two-stage beamforming. The first stage consists of a fixed focus algorithm that compresses channel data to scanline data. This can be done by integrated electronics in the handle. In the second stage the scanline data is further beamformed in the imaging system to obtain images that are synthetically focused at all depths. Here we present a wave equation two-stage beamforming method for phased array imaging that is computationally efficient and outperforms PSASB, a time-of-flight alternative, in terms of lateral resolution and contrast-to-noise ratio.Accepted Author ManuscriptImPhys/Acoustical Wavefield ImagingImPhys/Quantitative Imagin
Regularized Capon Beamformer Using ℓ1-Norm Applied to Photoacoustic Imaging
No full textDelay-and-Sum (DAS), as a non-adaptive beamforming method, is one of the most common algorithms used in Photoacoustic imaging due to its simple implementation. The results obtained from this algorithm suffer from low resolution and high sidelobes. The adaptive Minimum variance (MV) method improves the image quality compared to DAS in terms of resolution and contrast. In this paper, it is proposed to add a ℓ1-norm regularization term to the conventional MV minimization problem and create a new sparse beamforming method, named Modified-Sparse-Mv (ms-Mv)algorithm. In fact, the sparsity of the output is forced to the beampattern by adding this new sparse added term, which results in more noise reduction and sidelobe suppression compared to MV. The minimization problem is convex, and therefore, it can be solved using an iterative algorithm. The results show that the proposed MS-MV method improves the signal-to-noise-ratio for about 5.36 dB and 6.44 dB compared to DAS and MV, respectively, for the designed wire phantom.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.ImPhys/Acoustical Wavefield Imagin
Event Invitation: An Evening with Dr. Ken Robinson
No full textInvitation:
Guest speaker, Dr. Ken Robinson, author of “Out of Our Minds: Learning to be Creative, ” will speak on the importance of arts, the development of creativity, education, and the economy. And, introducing the inaugural DaVinci Scholars Awards program
Efficient and Flexible Spatiotemporal Clutter Filtering of High Frame Rate Images Using Subspace Tracking
No full textCurrent methods to measure blood flow using ultrafast Doppler imaging often make use of a Singular Value Decomposition (SVD). The SVD has been shown to be an effective way to remove clutter signals associated with slow moving tissue. Conventionally, the SVD is calculated from an ensemble of frames, after which the first dominant eigenvectors are removed. The Power Doppler Image (PDI) is then computed by averaging over the remaining components. The SVD method is computationally intensive and lacks flexibility due to the fixed ensemble length. We propose a method, based on the Projection Approximation Subspace Tracking (PAST) algorithm, which is computationally efficient and allows us to sequentially estimate and remove the principal components, while also offering flexibility for calculating the PDI, e.g. by using any convolutional filter. During a functional ultrasound (fUS) measurement, the intensity variations over time for every pixel were correlated to a known stimulus pattern. The results show that for a pixel chosen around the location of the stimulation electrode, the PAST algorithm achieves a higher Pearson correlation coefficient than the state-of-the-art SVD method, highlighting its potential to be used for fUS measurements.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
High Frequency Functional Ultrasound in Mice
No full textFunctional ultrasound (fUS) is a relatively new imaging modality to study the brain with a high spatiotemporal resolution and a wide field-of-view. In fUS detailed images of cerebral blood flow and volume are used to derive functional information, as changes in local flow and/or volume may reflect neuronal activation through neurovascular coupling. Most fUS studies so far have been performed in rats. Translating fUS to mice, which is a favorable animal model for neuroscience, pleads for a higher spatial resolution than what has been reported so far. As a consequence the temporal sampling of the blood flow should also be increased in order to adequately capture the wide range in blood velocities, as the Doppler shifts are inversely proportional to the spatial resolution. Here we present our first detailed images of the mouse brain vasculature at high spatiotemporal resolution. In addition we show some early experimental work on tracking brain activity upon local electrical stimulation.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
Oral history interview with Ken Hada
No full textKen Hada, author and professor, talks about his upbringing as a minister's son and shares how he became interested in writing and in poetry. He recalls submitting his first two poems for publication and having them accepted. Hada explains his creative process, the challenge of self-identifying as a writer, and co-founding the Scissortail Creative Writing Festival in Ada, Oklahoma. He also discusses a few of his projects, including writing vignettes to go along with his brother's paintings of the Arkansas River and his book Bring an Extry Mule.The Deep Roots: Oklahoma Authors Collection is a series of interviews with authors who discuss their lives, work, and creative processes
Ken Knight
No full textPhotograph - Ken Knight at Nancy Appleby's home, Christmas 1986. Athabasca, Albert
Career Spotlight: Ken Abdo, Esq.
No full textAn interview with Ken Abdo. He is a partner at the law firm of Fox Rothschild LLP. Spanning forty years, he has extensive experience serving as legal counsel to artists, creators, and businesses in the music and entertainment industries. He is a prolific author and lecturer on music and entertainment law matters. Harnessing his earlier years of experience as a musician, entertainer, and adjunct professor of entertainment law, Ken’s career has been a storied ride working with developing, established, legacy, and estates of music artists. He now represents both buyers and sellers of music artist recording and publishing catalogs. His commitment to advocacy has vaulted him to national and international leadership positions with The Recording Academy, the American Bar Association, The International Association of Entertainment Lawyers, and other organizations
Interview with "The Sun and the Shadow" author, Ken Kelzer
No full textKen Kelzer is a licensed clinical social worker in private practice in Novato, California. He is the author of the recently released autobiographical book The Sun and the Shadow: My Experiment with Lucid Dreamingpublished by A.R.E. Press and available from Lucidity Association
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