The invariance of wave equations in lossless mediaallows the Time Reversal (TR) technique to spatio-temporallyrefocus back-propagated signals in a given ultrawideband imagingscenario. However, the existence of dispersion and loss in thepropagation medium breaks this invariance and the resultant TRfocusing exhibits frequency and propagation duration dependentdegradation. We propose an algorithm based on the continuouswavelet transform that tackles this degradation to improve focusingresolution under such conditions. The developed algorithmhas been successfully applied to the scenario for localization oflung cancer.
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