Experimental and theoretical performance analysis for a CMOS-based high resolution image detector.

Area of Science:

• Medical Imaging
• X-ray Detector Technology
• Endovascular Interventions

Background:

• Endovascular procedures demand high-quality X-ray imaging.
• Current X-ray detectors face limitations in noise and resolution.
• CMOS detectors are emerging as a solution for improved image quality.

Purpose of the Study:

• To experimentally and theoretically analyze a new CMOS X-ray detector (Dexela Model 1207).
• To evaluate its sensitivity, modulation-transfer function (MTF), and detective quantum efficiency (DQE).
• To assess its suitability for complex endovascular interventions.

Main Methods:

• Experimental analysis of sensitivity, INEE, MTF, NPS, and DQE using RQA5 spectrum.
• Theoretical evaluation using a linear cascade model with an aliasing stage.
• Assessment in high and low sensitivity modes with different full-well capacities.

Main Results:

• The detector demonstrated excellent linearity in both operational modes.
• Sensitivity and INEE values were recorded for both modes (e.g., 31.55 DN/µR and 0.55 µR in high sensitivity mode).
• Experimental and theoretical MTF and DQE values showed close agreement, with good DQE at fluoroscopic exposure levels.

Conclusions:

• The Dexela CMOS detector exhibits high sensitivity and low noise.
• Its performance metrics, including MTF and DQE, meet the demands of advanced X-ray imaging.
• This detector can potentially overcome the limitations of current state-of-the-art X-ray detectors in endovascular procedures.