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Proceedings Article

Noise/dose reduction and image improvements in screening virtual colonoscopy with tube currents of 20 mAs with nonlinear Gaussian filter chains

[+] Author Affiliations
Georg-Friedemann Rust, Maximilian Reiser

Ludwig-Maximilians-Univ. Munich (Germany)

Volker Aurich

Heinrich-Heine-Univ. Duesseldorf (Germany)

Proc. SPIE 4683, Medical Imaging 2002: Physiology and Function from Multidimensional Images, 186 (April 22, 2002); doi:10.1117/12.463582
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From Conference Volume 4683

  • Medical Imaging 2002: Physiology and Function from Multidimensional Images
  • Anne V. Clough; Chin-Tu Chen
  • San Diego, CA | February 23, 2002

abstract

Purpose: To evaluate a filter method to extract noise from 20mAs Computed Tomography (CT) data for virtual colonoscopy screening. Method: Nonlinear Gaussian filter chains (NLGF) applied to CT datasets were used to extract noise. To test the efficiency of NLGF a simulation of different ellipsoidal shells with different levels of noise were used. Phantom studies were performed using a multidetector CT (tube currents 10 to 140mAs). 15 patients at high risk for colon cancer underwent a virtual colonoscopy examination (140mAs) and conventional colonoscopy. Different noise levels were added to each CT raw dataset (analog to 40 and 20mAs scans). Virtual endoscopic fly-throughs were performed and rated by two radiologists (image quality). Results: NLGF were able to extract image noise while preserving image structures down to signal--to--noise ratio levels of 0.5. The phantom studies (perspex bars, simulated polyps) were reconstructed without relevant changes between 20 and 140mAs. There were no significant differences between the endoscopic fly-throughs of 140 and 20mAs examinations (2 readers). Conclusion: NLGF is a promising preprocessing method for effective noise reduction in CT datasets. Edges are preserved as well as accentuated in high contrast images.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Georg-Friedemann Rust ; Volker Aurich and Maximilian Reiser
"Noise/dose reduction and image improvements in screening virtual colonoscopy with tube currents of 20 mAs with nonlinear Gaussian filter chains", Proc. SPIE 4683, Medical Imaging 2002: Physiology and Function from Multidimensional Images, 186 (April 22, 2002); doi:10.1117/12.463582; http://dx.doi.org/10.1117/12.463582


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