Detector response function of an energy-resolved CdTe single photon counting detector.
1Nuclear Engineering, Missouri University of Science and Technology, Rolla, MO, USA.
Journal of X-Ray Science and Technology
|November 20, 2014
Summary
This study models the detector response function for spectral CT imaging. A semi-analytical method accurately characterizes spectral distortion, enabling improved image reconstruction and quantitative analysis in medical imaging.
Area of Science:
- Medical Imaging Physics
- Detector Technology
- Computational Imaging
Background:
- Spectral CT imaging offers advantages but requires accurate detector response function knowledge.
- Energy-resolved detectors in spectral CT need precise characterization for signal bias correction and image reconstruction.
Purpose of the Study:
- To investigate the photo counting detector response function using laboratory sources.
- To develop and validate a signal bias correction method for spectral CT.
Main Methods:
- A semi-analytical model with 12 parameters was developed to describe the detector response function from 20-140 keV.
- Radioactive isotopes (Cd-109, Ba-133, Am-241, Co-57) were used to measure the response function at six photon energies.
- Non-linear least-square fitting determined model parameters, and their energy correlations were analyzed.
Main Results:
- The semi-analytical model accurately described the detector response function, showing good agreement with measured data.
- Higher photon energies were found to increase spectrum distortion.
- Theoretical analysis of spectrum distortion in spectral CT reconstruction was performed, and a correction method was proposed.
Conclusions:
- Spectrum distortion from detector response functions is significant in spectral and fluorescence CT and crucial for quantitative analysis.
- A semi-analytical method effectively determines the detector response function for CdTe detectors.
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