Fractal analysis of low attenuation clusters on computed tomography in chronic obstructive pulmonary disease

BMC Pulmonary Medicine
Naoya TanabeToyohiro Hirai

Abstract

The fractal dimension characterizing the cumulative size distribution of low attenuation area (LAA) clusters, identified with a fixed threshold such as - 950 Hounsfield Units (HU), on computed tomography (CT) sensitively detects parenchymal destruction in chronic obstructive pulmonary disease (COPD) even when the percent LAA (LAA%), a standard emphysema index, is unchanged. This study examines whether the cumulative size distribution of LAA clusters, defined with thresholds of the 15th, 25th, and 35th percentiles of a CT density histogram instead of the fixed-threshold of - 950 HU, exhibits a fractal property and whether its fractal dimension (D'15, D'25, and D'35, respectively) provides additional structural information in emphysematous lungs that is difficult to detect with the conventional - 950-HU-based fractal dimension (D950). Chest inspiratory CT scans and pulmonary functions were cross-sectionally examined in 170 COPD subjects. A proxy for the inspiration level at CT scan was obtained by dividing CT-measured total lung volume (CT-TLV) by physiologically measured total lung capacity. Moreover, long-term (> 5 years) changes in D950 and the new fractal dimensions were longitudinally evaluated in 17 current and 42 former sm...Continue Reading

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Citations

Jun 15, 2019·The European Respiratory Journal·Sarah M RyanNichole E Carlson
Jan 8, 2021·Frontiers in Physiology·Naoya TanabeToyohiro Hirai

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Methods Mentioned

BETA
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