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Ring artifact correction for high-resolution micro CT.

Yiannis Kyriakou¹, Daniel Prell, Willi A Kalender

¹Institute of Medical Physics, University of Erlangen-Nürnberg, Germany. yiannis.kyriakou@imp.uni-erlangen.de

Physics in Medicine and Biology

|August 8, 2009

Summary

This study introduces a new method to fix ring artifacts in high-resolution micro CT scans. The technique improves image quality by reducing noise and artifacts in both phantom and in vivo data.

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Area of Science:

Medical Imaging
Image Processing
X-ray Computed Tomography

Background:

High-resolution micro CT imaging utilizes flat detectors (FD).
Defects in FD elements can cause concentric-ring artifacts, degrading image quality.
Artifacts arise from inaccurate attenuation value estimations by detector elements.

Purpose of the Study:

To develop and evaluate an image-based method for correcting ring artifacts in high-resolution micro CT.
To enhance the diagnostic quality of micro CT images affected by detector-induced artifacts.
To improve the reliability of quantitative analysis from micro CT data.

Main Methods:

A post-processing correction method was developed for high-resolution micro CT.
The method employs median filtering on reconstructed images.
Image transformation into polar coordinates is utilized for artifact correction.

Main Results:

The proposed method effectively reduced concentric-ring artifacts.
Significant improvement in image quality was observed in both phantom and in vivo scans.
Noise and artifacts were reduced in transversal and multi-planar reformations.

Conclusions:

The developed image-based method is effective for ring artifact correction in high-resolution micro CT.
This technique enhances overall image quality and reduces artifacts, benefiting various micro CT applications.
The method offers a valuable tool for improving diagnostic accuracy and data interpretation in micro CT imaging.