Phased subarray imaging for low-cost, wideband coherent array imaging
AuthorJohnson, Jeremy A.
Ergün, Arif Sanlı
Khuri-Yakub, Butrus Thomas
MetadataShow full item record
CitationJohnson, J. A., Oralkan, O., Ergun, A. S., Demirci, U., Karaman, M., & Khuri-Yakub, B. T. (2003). Phased subarray imaging for low-cost, wideband coherent array imaging. Paper presented at the , 2 1875-1878 Vol.2. doi:10.1109/ULTSYM.2003.1293280
The front-end hardware complexity of conventional full phased array (FPA) imaging is proportional to the number of array elements. Phased subarray (PSA) imaging has been proposed as a method of reducing the hardware complexity-and therefore system cost and size-while achieving near-FPA image quality. A new method is presented for designing the subarray-dependent interpolation filters suitable for wideband PSA imaging. The method was tested experimentally using pulse-echo data of a wire target phantom acquired using a 3.2-cm. 128-element capacitive micromachined ultrasonic transducer (CMUT) array with 85% fractional bandwidth at 3 MHz. A specific PSA configuration using seven 32-element subarrays was compared to FPA imaging, representing a 4-fold reduction in front-end hardware complexity and a 43% decrease in frame rate. For targets near the fixed transmit focal distance, the mean 6-dB lateral resolution was identical to that of FPA, the axial resolution improved by 4%, and the SNR decreased by 5 dB. Measurements were repeated for 10 different PSA configurations with subarray sizes ranging from 4 to 60. The lateral and axial resolutions did not vary significantly with subarray size; both the SNR and contrast-to-noise ratio (CNR) improved with increased subarray size.
SourceProceedings of the IEEE Ultrasonics Symposium
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