# Non-local Operational Anisotropic Diffusion Filter

## TL;DR

This paper introduces a non-local weighted anisotropic diffusion filter that improves medical image quality by effectively reducing high-frequency noise in MRI and radiotherapy images, with detailed parameter analysis.

## Contribution

The paper presents a novel non-local anisotropic diffusion filter that outperforms local methods and is suitable for medical imaging applications.

## Key findings

- Enhanced image quality in MRI and radiotherapy images
- Effective noise reduction demonstrated
- Potential for improved radiotherapy treatment accuracy

## Abstract

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.