Direction of Arrival Filters for Improved Aberration Estimation
作者： Jeremy J. Dahl , Thomas J. Feehan
DOI: 10.1177/016173460803000103
关键词:
摘要: Successful adaptive imaging requires accurate measurements of the aberration profile across array surface. Two-dimensional spatial filters are used to obtain more estimates aberrating layers by suppressing wavefronts emanating from off-axis scatterers. Application these rf signals individual elements rejects arriving angles other than look direction and results in an increase element-to-element correlation. Spatial filtering reduced amount error measured profiles further improved estimates. The improvements estimation obtained with methods verified using simulations experiments tissue-mimicking phantoms. technique is applied vivo human thyroid.
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