[Relationship between Radiation Quality and Image Quality in Digital Chest Radiography: Validation Study Using Human...

Area of Science:

• Medical Imaging
• Radiologic Technology
• Diagnostic Radiology

Background:

• Image quality in chest radiography is crucial for accurate diagnosis.
• Optimizing radiation quality is essential for balancing image detail and patient safety.
• Phantoms simulating lung scatter are vital for realistic imaging assessments.

Purpose of the Study:

• To assess chest radiography image quality using varying radiation qualities.
• To evaluate phantom-based scatter fractions mimicking lung conditions.
• To determine optimal parameters for enhanced diagnostic imaging.

Main Methods:

• Utilized 10 cm and 4 cm thick soft tissue-equivalent phantoms to simulate lung attenuation.
• Incorporated soft tissue and bone-equivalent contrast objects.
• Acquired images at 120 kV and 90 kV with 0, 0.1, and 0.2 mm copper filtration at constant entrance surface dose.
• Measured signal-difference-to-noise ratio (SdNR) and soft tissue-to-bone contrast ratio.

Main Results:

• Increased copper filter thickness improved SdNR at both 120 kV and 90 kV.
• SdNR showed no significant difference between 120 kV and 90 kV for identical filter thicknesses.
• A contrast ratio approximately 8% higher was observed at 120 kV compared to 90 kV.

Conclusions:

• The combination of 120 kV and 0.2 mm copper filtration yielded the best image quality, characterized by high SdNR and superior contrast ratio.
• 120 kV is confirmed to be more advantageous than 90 kV for chest radiography.
• Optimized radiation quality enhances diagnostic performance in chest imaging.