[What future for chest x-ray against ultra-low-dose computed tomography?]

Area of Science:

• Radiology and Medical Imaging
• Medical Technology
• Pulmonary Medicine

Background:

• Technological advancements, particularly iterative reconstruction, have significantly reduced radiation doses in CT scans.
• Chest CT radiation doses can now approach those of standard PA and lateral chest X-rays.
• Ultra-low dose chest CT (ULD-CT) intentionally degrades image quality while maintaining diagnostic value for specific applications.

Purpose of the Study:

• To evaluate the diagnostic effectiveness and limitations of ULD-CT.
• To determine ULD-CT's potential as a replacement for standard chest CT and chest radiography.
• To highlight ULD-CT's utility in scenarios where radiation exposure is a primary concern.

Main Methods:

• Utilized iterative reconstruction techniques to achieve ultra-low radiation doses in chest CT scans.
• Assessed image quality and diagnostic performance across various clinical indications.
• Compared ULD-CT findings with those from standard chest radiography and conventional CT.

Main Results:

• ULD-CT is validated for detecting and monitoring solid lung nodules, diagnosing and tracking infectious lung diseases, and screening for asbestos-related pleural lesions.
• Limitations include analyzing mediastinal structures, imaging severely obese patients (BMI > 35), and detecting interstitial lung diseases.
• ULD-CT provides more comprehensive data than chest radiography at a comparable radiation cost.

Conclusions:

• ULD-CT is a viable alternative to standard chest CT for specific indications, especially when minimizing radiation dose is critical (e.g., pediatric patients, frequent examinations, screening programs).
• ULD-CT is emerging as a first-line imaging modality, offering a radiation dose similar to chest X-rays but with enhanced diagnostic information.
• Further research may expand ULD-CT's role in clinical practice, balancing image quality with radiation safety.