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Comparison of computed density and macroscopic morphometry in pulmonary emphysema
P A Gevenois1, V de Maertelaer, P De Vuyst
1Department of Radiology, Hôpital Erasme, Brussels, Belgium.
American Journal of Respiratory and Critical Care Medicine
|August 1, 1995
Summary
High-resolution computed tomography (HRCT) can measure emphysema using specific thresholds. The study found -950 HU to be the most accurate threshold, but scan interval distance varies per patient for optimal results.
Area of Science:
- Pulmonary Medicine
- Radiology
- Quantitative Imaging
Background:
- Emphysema quantification is crucial for lung disease management.
- High-resolution computed tomography (HRCT) offers detailed lung imaging.
- Accurate measurement of emphysematous changes is needed.
Purpose of the Study:
- To evaluate HRCT attenuation values for measuring macroscopic emphysema.
- To determine the optimal threshold for emphysema quantification via HRCT.
- To assess the impact of scan interval on HRCT emphysema measurement accuracy.
Main Methods:
- HRCT scans were analyzed in 63 subjects undergoing lung surgery or transplantation.
- Semiautomatic procedures calculated relative lung areas below various HU thresholds (-900 to -970 HU).
- HRCT findings were compared with computer-assisted quantification on lung sections.
Main Results:
- A threshold of -950 HU showed no statistically significant difference between HRCT and morphometric data.
- Recalculating emphysema extent with fewer scans revealed patient-specific variations.
- No standard optimal distance between HRCT scans could be recommended due to inter-patient variability.
Conclusions:
- HRCT, particularly at -950 HU, can quantify emphysema extent.
- The accuracy of HRCT emphysema measurement is influenced by scan interval.
- Patient-specific factors necessitate individualized approaches for HRCT scan acquisition in emphysema assessment.