Medical ultrasonic system and method for synthetic aperture proc

Details Medical ultrasonic system and method for synthetic aperture proc Medical ultrasonic system and method for synthetic aperture proc

1999-03-31

2000-10-17

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600447, A61B 800

Patent

active

061323756

ABSTRACT:
Coherent data representing a plurality of two-dimensional regions that overlap as a function of the elevational beam width are obtained. The coherent data, such as in-phase and quadrature data, is filtered along an elevational dimension. The filtering adjusts the phase of the coherent data in the elevation dimension. Filtering effectively generates a Fourier transform of the coherent data along the elevational dimension, and adjusts the phase by multiplying by a spectral focusing function. Multiplying by the spectral focusing function results in a constant phase. The coherent data is then inversed Fourier transformed. This filtering narrows the elevation beam width associated with portions of each two-dimensional set of data. The filter varies as a function of the axial position of the coherent data. In particular, the elevation beam width for a linear transducer is wider near the transducer and beyond the elevational focal point, so the associated phase is more distorted at points more distant from the elevation focal point from the acoustic lens. The filter accounts for this axial varying distortion of the phase.

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John C. Curlander et al., Synthetic Aperture Radar Systems and Signal Processing, 1991;.
Donald R. Wehner; High Resolution Radar; 1931; pp. 184-203;.

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