[Physical imaging properties of a flat panel X-ray detector system]

Area of Science:

• Medical Imaging Physics
• Radiographic Technology
• Digital Detector Systems

Background:

• Flat panel detectors (FPDs) are increasingly used in digital radiography.
• Evaluating imaging properties is crucial for system optimization.
• The Revolution XQ/i system represents a new FPD for chest imaging.

Purpose of the Study:

• To characterize the physical imaging properties of the Revolution XQ/i FPD.
• To compare its performance against a Fuji Computed Radiography (FCR) system.
• To assess the suitability of the FPD for radiographic applications.

Main Methods:

• Measurements included characteristic curves, modulation transfer function (MTF), and Wiener spectrum.
• Evaluations were conducted at 80 kV and 120 kV tube voltages.
• Performance was compared to a Fuji ST-V imaging plate (CR system).

Main Results:

• The FPD exhibited a linear correlation between pixel values and incident exposure.
• Dynamic range was approximately 0.003 to 2 microC/kg.
• Presampling MTFs were consistent across tested voltages and slit orientations.
• FPD resolution was 46% higher than CR at 2 cycles/mm.
• FPD Wiener spectrum was 1/10 lower than CR, indicating reduced noise.

Conclusions:

• The Revolution XQ/i FPD demonstrates excellent imaging performance.
• Its high resolution and low noise characteristics offer advantages over CR systems.
• The FPD is well-suited for digital chest radiography applications.