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Imaged scan patterns when the catheter body is freely laid (upper row) and pressed in a direction (lower row) for the case of driving it at a full-resonance frequency of 63.3 Hz (two columns in the left) and at an off-resonance frequency of 62.7 Hz (column in the right), respectively. Dotted orange ellipses and a dotted line were added for comparing the two in each column.
