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To Reconstruct or Discard: A Comparison of Additive and Subtractive Charge Sharing Correction Algorithms at High and
Oliver L P Pickford Scienti1, Dimitra G Darambara1
1Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Foundation Trust, London SM2 5NG, UK.
Sensors (Basel, Switzerland)
|August 10, 2024
Summary
This study compares additive and subtractive charge sharing correction algorithms (CSCAs) for X-ray photon-counting spectral imaging detectors. Additive CSCAs excel in absolute efficiency, while subtractive CSCAs perform better in relative spectral efficiency at higher X-ray fluxes.
Area of Science:
- Medical Imaging
- Detector Physics
- Photon-Counting Spectral Imaging
Background:
- Effective X-ray photon-counting spectral imaging (x-CSI) detector design requires optimizing sensor and electronic parameters.
- Charge sharing is a key challenge in x-CSI detector performance, necessitating correction algorithms.
Purpose of the Study:
- To compare the advantages and disadvantages of additive and subtractive charge sharing correction algorithms (CSCAs) in x-CSI detectors.
- To evaluate the performance of these CSCAs across various detector designs and X-ray fluxes.
Main Methods:
- Simulated performance of additive and subtractive CSCAs on x-CSI detector data.
- Varied detector parameters (pixel pitch, sensor thickness) and X-ray fluxes.
- Characterized performance using absolute detection efficiency (ADE), absolute photopeak efficiency (APE), relative coincidence counts (RCC), and binned spectral efficiency (BSE).
Main Results:
- Both additive and subtractive CSCAs showed similar performance at low X-ray fluxes.
- At higher fluxes, additive CSCAs generally outperformed subtractive CSCAs in ADE and APE.
- Subtractive CSCAs generally showed better performance in RCC and BSE at higher fluxes.
Conclusions:
- The choice between additive and subtractive CSCAs depends on the operating X-ray flux and application priorities (dose vs. spectral efficiency).
- Understanding the mechanistic differences in handling charge sharing and pulse pileup is crucial for detector optimization.
