Angular scatter ultrasound imaging of wavelength scale targets

A bistatic ultrasound imaging system is demonstrated that uses two 32-element linear phased array transducers oriented at an angle of 40 degrees to one another. The system simultaneously acquires and displays in real time one conventional backscatter image and one "angular scatter" image f...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2000-10, Vol.108 (4), p.1914-1919
Main Authors: Lacefield, J C, von Ramm, O T
Format: Article
Language:English
Subjects:
Acoustics
Humans
Image Processing, Computer-Assisted
Phantoms, Imaging
Scattering, Radiation
Transducers
Ultrasonography - instrumentation
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Summary:A bistatic ultrasound imaging system is demonstrated that uses two 32-element linear phased array transducers oriented at an angle of 40 degrees to one another. The system simultaneously acquires and displays in real time one conventional backscatter image and one "angular scatter" image formed using side-scattered echoes from the same B-mode sector region. Experiments are presented that show differences in the magnitudes of backscatter and angular scatter signals acquired from three nylon monofilaments with diameters less than one wavelength and from soft tissue structures in vivo. The relative magnitudes of angular scatter signals from the monofilaments are qualitatively consistent with a theoretical analysis of acoustic scattering from elastic cylinders. Larger tissue features are more clearly defined in angular scatter images. This result is attributed to the orientation of specularly reflecting surfaces and the expected influence of scattering angle on the system's sensitivity to different scatterer spacings.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.1310198