Dual-Energy CT Quantification of Lung Iron Oxide for Diagnosing Arc-Welders’ Pneumoconiosis

Overview

This study evaluates the accuracy of dual-energy CT (DECT) in quantifying iron oxide deposition in the lungs to improve early diagnosis of arc-welders’ pneumoconiosis (AWP). Phantom experiments demonstrated a strong correlation between measured and actual Fe2O3 concentrations, and a prospective case-control study assessed DECT’s diagnostic utility in welders versus controls.

Background

Arc-welders’ pneumoconiosis results from prolonged inhalation of welding fumes, potentially causing lung fibrosis and increasing lung cancer risk. Diagnosis is challenging due to nonspecific CT findings that overlap with other lung diseases and the limited specificity of bronchoalveolar lavage fluid analysis. Lung biopsy is invasive and not widely accepted, highlighting the need for novel, noninvasive imaging techniques. Dual-energy CT offers multi-parameter imaging capable of material decomposition, enabling quantification of iron oxide in lung tissue, which may enhance early and specific diagnosis of AWP.

Data Highlights

Key Findings

• Phantom experiments confirmed a strong linear correlation between actual and DECT-measured Fe2O3 concentrations, validating the accuracy of iron oxide quantification.
• DECT imaging with Fe2O3-based material decomposition can detect and quantify iron oxide deposition in the lungs of arc welders.
• Iron oxide quantification by DECT may differentiate AWP from other diffuse lung diseases with similar CT imaging features.
• The study included three groups: arc welders with ≥3 years exposure, patients with mimic imaging features but no welding history, and healthy controls without occupational exposure.
• DECT scanning protocol utilized rapid tube voltage switching (80 kVp and 140 kVp) and iterative reconstruction to optimize image quality and material decomposition.

Clinical Implications

DECT-based quantification of lung iron oxide offers a promising noninvasive diagnostic tool to improve early detection of arc-welders’ pneumoconiosis, potentially reducing misdiagnosis and unnecessary invasive procedures. Incorporating this imaging technique into clinical practice may enhance differentiation of AWP from other interstitial lung diseases, especially in patients with complex occupational and smoking histories.

Conclusion

Dual-energy CT with Fe2O3 material decomposition accurately quantifies lung iron oxide deposition and shows potential as a specific imaging biomarker for early diagnosis of arc-welders’ pneumoconiosis. This approach may improve diagnostic confidence and patient management in occupational lung disease.

References

1. 1 -- Studies on AWP and pulmonary fibrosis
2. 2 -- Excessive iron fumes and irreversible fibrosis in AWP
3. 3 -- CT imaging features of AWP and differential diagnosis challenges
4. 4 -- BALF ferritin analysis limitations in AWP diagnosis
5. 5,6,7,8 -- Advances in dual-energy CT and material decomposition technology