A tunable bandwidth selector is disclosed. A line and direction image is created from a digital mammogram, and a region of potential intersection for substantially every pixel in the digital mammogram image is determined. Further, an efficient parsing approach can be utilized that enables processing of a data structure without first materializing the entire structure to memory. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. The driving unit is disposed within the main body for generating the power pneumatically.