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Field II ultrasonic displacement tracking code using FEM displacement fields

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Probes like the 9L4 and 14L5 that have multiple rows are not appropriately taken into account in ultratrack (they are in fem). Need to re-work several things to accommodate the...

why is txoffset in the curvilinear definition and not the linear/phased/matrix definitions?

would be nice to have code that will demodulate the RF data to IQ, to test IQ displacement estimation code

enhancement

FEM code allows for experimentally-measured impulse responses to be used instead of modulated Guassian waveforms; would like to add this functionality to the tracking code too!

enhancement

Doug and I have seen issues w/ RF data that is non-zero mean; could this be related to using all 1 amplitude scatterers. Jorgen recommends using a zero-mean normal distribution...

bug