Impact of pixel value truncation on image quality of low dose chest CT.

Akira Hasegawa^1,2, Toshihiro Ishihara¹, Tinsu Pan³, Alan M Ropp⁴, Michael Winkler⁵, Michael B Sneider⁴

¹Department of Radiological Technology, National Cancer Center Japan, Tokyo, Japan.

²AlgoMedica, Inc., Sunnyvale, California, USA.

³Department of Imaging Physics, M.D. Anderson Cancer Center, University of Texas, Houston, Texas, USA.

⁴Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, Virginia, USA.

⁵Department of Radiology and Imaging, Medical College of Georgia at Augusta University, Augusta, Georgia, USA.

PubMed DOI

Abstract

PURPOSE: In some noisy low dose CT lung cancer screening images, we noticed that the CT density values of air were increased and the visibility of emphysema was distinctly decreased. By examining histograms of these images, we found that the CT density values were truncated at -1024 HU. The purpose of this study was to investigate the effect of pixel value truncation on the visibility of emphysema…

Create a free account to keep reading

Free members get 10 full research views every month across publications, clinical trials, FDA clearances, adverse events, and NIH grants. No credit card required.

Create Free Account Sign In

Want unlimited research access? See Pro plans

Data Accuracy Notice: Research intelligence on Health AI Central is aggregated from public sources (PubMed, ClinicalTrials.gov, FDA, NIH, CMS, and others) and refreshed nightly. Classifications and derived metrics are produced by automated methods described in our Methodology. We recommend verifying critical data points against the primary sources before making decisions.