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Publication - Professor Nishan Canagarajah

    Compressed quantitative acoustic microscopy

    Citation

    Kim, JH, Hill, PR, Canagarajah, N, Rohrbach, D, Kouame, D, Mamou, J, Achim, A & Basarab, A, 2017, ‘Compressed quantitative acoustic microscopy’. in: 2017 IEEE International Ultrasonics Symposium (IUS 2017). Institute of Electrical and Electronics Engineers (IEEE)

    Abstract

    Scanning acoustic microscopy is a well-accepted modality for forming quantitative 2D maps of acoustic properties of soft tissues at microscopic scales. In our studies, the sample is raster-scanned with a spatial step size of 2 μm using a 250 MHz transducer resulting in 3D RF data cubes. Each RF signal is processed to obtain, for each spatial location, acoustic parameters, e.g., the speed of sound. The scanning time is directly dependent on the sample size and can range from few minutes to hours. In order to maintain constant experimental conditions for the sensitive thin sectioned samples, the scanning time is an important practical issue. Hence, the main objective of this work is to reduce the scanning time by reconstructing acoustic microscopy images from spatially under sampled measurements, based on the theory of compressive sampling. A recently proposed approximate message passing method using a Cauchy maximum a posteriori image denoising algorithm is thus employed to account for the non-Gaussianity of quantitative acoustic microscopy wavelet coefficients.

    Full details in the University publications repository