An insertion tube configured to be inserted into a body cavity and having a first lumen having a first lumen diameter and a distal opening, and smaller than the second lumen and the first lumen diameter A tubular channel having an outer diameter and inserted into the first lumen. The device is a support structure that is configured to communicate with the distal opening through the space between the inner wall of the insertion tube and the outer wall of the tubular channel in a folded state and upon exiting the support structure through the distal opening. A support structure configured to deploy in a direction transverse to the first lumen to a support diameter greater than the first lumen diameter. A plurality of planar two-dimensional (2D) arrays of ultrasonic transducers are supported by the support structure, the arrays having a lateral dimension that is less than the first lumen diameter. [Selection] Figure 1
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