Real time adaptive imaging with 1.75D, high frequency arrays
We have created a system for real-time phase aberration correction functional with a 7.5 MHz, 1×192 element 1D linear array (Siemens) and a 9.5 MHz, 8×96 element, 1.75D linear array (Tetrad), using a Siemens Antares scanner. Aberration profiles are estimated with a weighted least squares algorithm. The calculated aberration profiles are used to modify the transmit and receive phasing of array elements. The present implementation requires 0.6 seconds for transmit and receive correction with the 1×192 array, 1.0 second for receive-only correction on with 8×96 array, and 1.5 seconds for transmit and receive correction with the 8×96 array. We present aberrated and corrected images of speckle target phantoms produced with one- and two-dimensional physical aberrators for both arrays.
