Compound ultrasonic transducers are disclosed that include multiple transducer elements configured to have overlapping or consecutive depths of focus in an axial direction. Embodiments of such transducers can be composed of a concentric disc- and one or more annular-type elements and each element has a different radius of curvature to produce multiple focal zones (depths-of focus) upon excitation. Exemplary embodiments include a concentric disc- and one annular-type elements, with each element has a different radius of curvature, which are referred to herein as a dual-focus therapeutic ultrasound transducer (DFTUT). Method of directing ultrasonic energy to a target area and thereby aligning ultrasonic focal zones (depths-of focus) are also disclosed. Two or more transducer elements can each be configured to produce a different focal zone at the target area, such as targeted tissue.
