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We analyse the ultrasound waves reflected by multiple bubbles in thelinearized time-dependent acoustic model. The generated time-dependent wavefield is estimated close to the bubbles. The motivation of this study comesfrom the therapy modality using acoustic cavitation generated by injectedbubbles into the region of interest. The goal is to create enough, but not toomuch, pressure in the region of interest to eradicate anomalies in that region.  Here, we derive the dominant part of the generated acoustic field by acluster of bubbles taking into account the (high) contrasts of their massdensity and bulk as well as their general distribution in the given region.  As consequences of these approximations, we highlight the following features:1. If we use dimers (two close bubbles), or generally polymers, then we obtaina remarkable enhancement of the whole echo in the whole time. 2. If wedistribute the bubbles every where in the region of interest,then we can derivethe effective acoustic model which turns out to be a dispersive one. We showthat, for a given desired pressure, we can tune the effective model to generateit.

Time-Dependent Acoustic Waves Generated by Multiple Resonant Bubbles: Application to Acoustic Cavitation