A form-preserving 2D z-domain helix transform is proposed for the synthesis of computable practical-BIBO stable 2D recursive filters computed over uniformly-spaced circular input arrays. The helix transform converts non-computable 2D IIR filters into computable and BIBO stable 1D filters in order to facilitate the required 2D IIR filter transfer function in space-time. Further, a novel scanned-array architecture of the proposed 2D helical circular array processors is proposed that is suitable for VLSI implementation.