Thermoacoustic tomography is a hybrid imaging technique combining electromagnetic (EM) excitation (similar to MRI) with ultrasound receivers. Ideal EM excitation pulses are homogeneous in space and impulsive in time. Just as in MRI, the patient tissue itself wreaks havoc with mathematically elegant 0th order imaging equations. The hard realities of signal excitation in practice will be discussed along with more physical models of thermoacoustic signal excitation.
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