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  • 1
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biomedical Engineering 1 (1999), S. 559-588 
    ISSN: 1523-9829
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Technology , Medicine
    Notes: Abstract Since the introduction of medical ultrasound in the 1950s, modern diagnostic ultrasound has progressed to see many major diagnostic tools come into widespread clinical use, such as B-mode imaging, color-flow imaging, and spectral Doppler. New applications, such as panoramic imaging, three-dimensional imaging, and quantitative imaging, are now beginning to be offered on some commercial ultrasound machines and are expected to grow in popularity. In this review, we focus on the various algorithms, their processing requirements, and the challenges of these ultrasound modes. Whereas the older, mature B and color-flow modes could be systolically implemented using hardwired components and boards, new applications, such as three-dimensional imaging and image feature extraction, are being implemented more by using programmable processors. This trend toward programmable ultrasound machines will continue, because the programmable approach offers the advantages of quick implementation of new applications without any additional hardware and the flexibility to adapt to the changing requirements of these dynamic new applications.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 388-390 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In-plane magnetic-field photoluminescence spectra from a series of n-type modulation-doped GaAs/Al0.3Ga0.7As coupled double quantum wells show distinctive doublet structures related to the tunnel-split ground sublevel states. The magnetic-field behavior of the upper transition from the antisymmetric state strongly depends on sample mobility. In a lower mobility sample, the transition energy displays an N-type kink with field (namely, a maximum followed by a minimum), whereas higher mobility samples have a linear dependence. The former is attributed to a coupling mechanism due to homogeneous broadening of the electron and hole states. The results are in good agreement with recent theoretical calculations. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Book
    Book
    Belllingham, Washington :SPIE Press,
    Title: Displays and PACS; Vol. 3
    Contributer: Kim, Yongmin , Horii, Steven C.
    Publisher: Belllingham, Washington :SPIE Press,
    Year of publication: 2000
    Pages: 512 S.
    Series Statement: Handbook of medical imaging Vol. 3
    Type of Medium: Book
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