首页|Phase aberration correction on two-dimensional conformal arrays
Phase aberration correction on two-dimensional conformal arrays
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Two-dimensional conformal arrays are proposed to enhance lowcontrast lesion detection deep in the body. The arrays conform to thebody maintaining good contact over a large area. To provide fullthree-dimensional focusing for two-dimensional imaging, such arrays aredensely sampled in the scan direction (x) and coarsely sampled in thenonscan direction (y), i.e., the arrays are anisotropic. To illustratereduction in slice thickness with increased array length in y, atwo-dimensional array is synthesized using a one-dimensional, 128element array with a 3.5 MHz center frequency. A mask is attachedconfining transmission and reception of acoustic waves to 2 mm in y.Using a mechanical scan system, the one-dimensional array is moved alongy covering a 28.16 mm×20.0 mm aperture. Accordingly, the syntheticarray has 128 elements in x and 10 elements in y. To correct forgeometric irregularities due to array movement, a gelatin based phantomcontaining three-dimensional point targets is used for phase aberrationcorrection. Results show that elevational beam quality is degraded ifsmall geometric errors are not removed. Emulated conformality at thebody surface and phase aberrations induced by spatial inhomogeneities intissue are further imposed and shown to produce severe beam-formingartifacts. Two-dimensional phase aberration correction is applied andresults indicate that the method is adequate to compensate for largephase excursions across the entire array. To fully realize the potentialof large, two-dimensional, conformal arrays, proper two-dimensionalphase aberration correction methods are necessary
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