Diagnostic performance of a prototype dual-energy chest imaging system ROC analysis

Area of Science:

• Radiology and Medical Imaging
• Diagnostic Imaging Technology
• Pulmonary Medicine

Background:

• Digital radiography (DR) is a standard for chest imaging.
• Dual-energy (DE) imaging offers potential for improved lesion characterization.
• Assessing DE system performance against DR is crucial for clinical adoption.

Purpose of the Study:

• To compare the diagnostic performance of an experimental DE chest imaging system with DR for lung lesion detection and characterization.
• To evaluate performance using receiver-operating characteristic (ROC) analysis.

Main Methods:

• 129 patients with lung lesions underwent both DE and DR imaging.
• DE images were decomposed into soft-tissue, bone, and composite components.
• Five radiologists evaluated images using ROC tests, analyzing nodule detection and characterization.

Main Results:

• Overall ROC performance was similar between DE and DR (AUCs 0.795 vs. 0.789).
• DE imaging showed significant advantages for small nodules (<1 cm) and lesions in the right upper/lower lobes.
• DE provided clinically significant differential diagnoses in about one-third of patients.

Conclusions:

• DE chest imaging at dose-equivalent levels performs comparably to DR overall.
• DE imaging demonstrates superior diagnostic performance for specific subgroups, including subcentimeter lung lesions.
• DE imaging may improve early detection of lung malignancy.