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Proceedings Paper

Investigation of image components affecting the detection of lung nodules in digital chest radiography
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Paper Abstract

The aim of this work was to investigate and quantify the effects of system noise, nodule location, anatomical noise and anatomical background on the detection of lung nodules in different regions of the chest x-ray. Simulated lung nodules of diameter 10 mm but with varying detail contrast were randomly positioned in four different kinds of images: 1) clinical images collected with a 200 speed CR system, 2) images containing only system noise (including quantum noise) at the same level as the clinical images, 3) clinical images with removed anatomical noise, 4) artificial images with similar power spectrum as the clinical images but random phase spectrum. An ROC study was conducted with 5 observers. The detail contrast needed to obtain an Az of 0.80, C0.8, was used as measure of detectability. Five different regions of the chest x-ray were investigated separately. The C0.8 of the system noise images ranged from only 2% (the hilar regions) to 20% (the lateral pulmonary regions) of those of the clinical images. Compared with the original clinical images, the C0.8 was 16% lower for the de-noised clinical images and 71% higher for the random phase images, respectively, averaged over all five regions. In conclusion, regarding the detection of lung nodules with a diameter of 10 mm, the system noise is of minor importance at clinically relevant dose levels. The removal of anatomical noise and other noise sources uncorrelated from image to image leads to somewhat better detection, but the major component disturbing the detection is the overlapping of recognizable structures, which are, however, the main aspect of an x-ray image.

Paper Details

Date Published: 6 April 2005
PDF: 12 pages
Proc. SPIE 5749, Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment, (6 April 2005); doi: 10.1117/12.595506
Show Author Affiliations
Magnus Bath, Sahlgrenska Univ. Hospital (Sweden)
Markus Hakansson, Sahlgrenska Univ. Hospital (Sweden)
Sara Borjesson, Sahlgrenska Univ. Hospital (Sweden)
Christoph Hoeschen, Otto-von-Guericke Univ. Hospital (Germany)
GSF--National Research Ctr. for Environment and Health (Germany)
Oleg Tischenko, Otto-von-Guericke Univ. Hospital (Germany)
GSF--National Research Ctr. for Environment and Health (Germany)
Francois O. Bochud, Univ. Institute for Applied Radiophysics (Switzerland)
Francis R. Verdun, Univ. Institute for Applied Radiophysics (Switzerland)
Gustaf Ullman, Linkoping Univ. (Sweden)
Susanne Kheddache, Sahlgrenska Univ. Hospital (Sweden)
Anders Tingberg, Malmo Univ. Hospital (Sweden)
Lars Gunnar Mansson, Sahlgrenska Univ. Hospital (Sweden)


Published in SPIE Proceedings Vol. 5749:
Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment
Miguel P. Eckstein; Yulei Jiang, Editor(s)

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