Dual Mode Ultrasound Arrays (DMUAs) represent a new paradigm in non-invasive image-guided surgery. For therapeutic efficiency, DMUA design is optimized by using large elements and a small number of driving circuits. For accurate imaging, conventional delay-and-sum beam forming necessitates a large number of small elements. This investigation aims to ease hardware requirements for continuous wave DMUAs in therapeutic mode while maintaining small element size useful for imaging. A phase and magnitude quantization technique was developed to cluster elements with similar excitations. A set of elements in a cluster is connected in parallel to a single amplifier, which results in significant channel count reduction. The resulting heating fields were simulated and compared to the fields from unquantized arrays. Results indicate that it is possible to reproduce a desired field with high fidelity using a small number of distinct driving signals.