The present invention provides microwave systems and methods for achieving better control of process and film properties by optimizing plasma containment shield shaping around an antenna. The head includes a ferrule adapted to fit over one end of the handle, and first and second cutting portions extending laterally away from opposite sides of the ferrule. An error ratio is computed, wherein the error ratio comprises a ratio of the number of error bits to the number of error symbols. A driver is coupled to the actuators to selectively control the rate, volume, and direction of flow of fluid through the needles. Under certain conditions, for at least one pixel, the value of said pixel is approximated using one or more pixel values in the same frame.