Image geometric corrections for a new EMCCD-based dual modular x-ray imager

Area of Science:

• Medical Imaging
• X-ray Imaging Technology

Background:

• A novel EMCCD-based dual modular x-ray imager was developed for angiography and fluoroscopy.
• The imager offers a high dynamic range (53 dB) and small effective pixel size (26 μm).
• Image misalignment occurs due to EMCCD sensor and fiber optic taper mismatches.

Purpose of the Study:

• To present a method for correcting display registration errors in the dual modular x-ray imager.
• To enable accurate stitching of images from multiple modules.

Main Methods:

• A custom-designed two-layer printed circuit board was developed for calibration.
• The board features grid lines as a calibration pattern for accurate reference and contrast.
• This method corrects display registration issues in the 2048 × 1024 digital output.

Main Results:

• The custom printed circuit board effectively corrects display registration mismatches.
• Accurate and fine stitching of the two output modules was achieved.
• The method enables proper display registration for clinical applications.

Conclusions:

• A practical and effective method for correcting display registration in EMCCD-based dual modular x-ray imagers has been demonstrated.
• The developed calibration board ensures accurate image stitching and enhances diagnostic imaging quality.
• This technique is crucial for optimizing the performance of advanced x-ray imaging systems.