  High-frequency noise is present in several modalities of medical images. It
originates from the acquisition process and may be related to the scanner
configurations, the scanned body, or to other external factors. This way,
prospective filters are an important tool to improve the image quality. In this
paper, we propose a non-local weighted operational anisotropic diffusion filter
and evaluate its effect on magnetic resonance images and on kV/CBCT
radiotherapy images. We also provide a detailed analysis of non-local parameter
settings. Results show that the new filter enhances previous local
implementations and has potential application in radiotherapy treatments.
