NDLI: Pseudospectral methods for large-scale bioacoustic models

Content Provider	IEEE Xplore Digital Library
Author	Wojcik, G. Fomberg, B. Waag, R. Carcione, L. Mould, J. Nikodym, L. Driscoll, T.
Copyright Year	1997
Description	Author affiliation: Weidlinger Assoc. Inc., Los Altos, CA, USA (Wojcik, G.)
Abstract	Large-scale simulations of ultrasonic waves in heterogeneous tissue models are useful in biomedical R&D for imaging and therapeutics. The scale of bioacoustic models is hundreds of wavelengths. Typical 2D wave solvers are not practical at this scale, and 3D is out of the question, because of numerical errors and/or computer limits. To achieve much higher performance we use the periodic pseudospectral (PS) method, where spatial derivatives are calculated from FFTs over Cartesian grids. With a 4th order explicit time integrator, the PS method yields the necessary accuracy and efficiency. However, the domain must be periodic. We show how to circumvent this intrinsic limitation with Berenger's perfectly matched layer (PML) on the boundaries. High accuracy, computational efficiency, and parallelism are demonstrated and a large-scale bioacoustic model is calculated. Generalizations of the method are described, including attenuation and nonlinearity.
Starting Page	1501
Ending Page	1506
File Size	483952
Page Count	6
File Format	PDF
ISBN	0780341538
ISSN	10510117
DOI	10.1109/ULTSYM.1997.661861
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-05
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Large-scale systems Biomedical acoustics Computational modeling Biomedical imaging Ultrasonic imaging Computer errors Biomedical computing Flexible printed circuits Perfectly matched layers Computational efficiency
Content Type	Text
Resource Type	Article

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