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Updated: Jun 8, 2026

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Daniel Prell¹, Yiannis Kyriakou, Willi A Kalender

¹Institute of Medical Physics, University of Erlangen-Nürnberg, Henkestrasse 91, 91052 Erlangen, Germany.

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Summary

Ring artifacts in flat-detector CT (computed tomography) degrade image quality. A new method using polar coordinates effectively reduces these artifacts, outperforming Cartesian coordinate correction.

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Area of Science:

Medical Imaging
Computed Tomography
Image Processing

Background:

Flat-detector CT (FDCT) systems can suffer from concentric ring artifacts caused by detector element defects.
These artifacts significantly degrade image quality, particularly in high-spatial resolution applications.
Artifact reduction is crucial for reliable FDCT imaging.

Purpose of the Study:

To compare two post-processing methods for correcting ring artifacts in FDCT images.
To evaluate the effectiveness of correction in Cartesian versus polar coordinate systems.

Main Methods:

Two ring artifact correction methods were developed and compared.
Method 1: Filtering in Cartesian coordinates.
Method 2: Transformation to polar coordinates followed by filtering.

Main Results:

Both methods reduced ring artifacts and improved image quality.
Correction in polar coordinates was more effective than in Cartesian coordinates.
Cartesian correction introduced new artifacts and inadequately corrected central artifacts.

Conclusions:

Transformation to polar coordinates is essential for efficient ring artifact correction in FDCT.
The polar coordinate method offers superior artifact reduction compared to Cartesian methods.
This technique enhances the diagnostic value of FDCT images.