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Large-area single-photon-counting CdTe detector for synchrotron radiation computed tomography: a dedicated

Luca Brombal1, Sandro Donato1, Francesco Brun2

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Journal of Synchrotron Radiation
|July 7, 2018
PubMed
Summary

A new data pre-processing method enhances large-area cadmium telluride (CdTe) detectors for low-dose imaging. This technique effectively corrects artifacts in computed tomography (CT) scans, improving image quality for medical applications.

Keywords:
CdTebreast-CTdynamic correctionpre-processingsingle-photon counting

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Area of Science:

  • Medical Imaging
  • Detector Physics
  • Materials Science

Background:

  • Large-area single-photon-counting detectors are crucial for low-dose imaging applications.
  • Current multi-module detector architectures face challenges with inter-module gaps and edge pixel performance.
  • Time-dependent gain variations in high-Z detectors, like CdTe, introduce artifacts, particularly in computed tomography (CT).

Purpose of the Study:

  • To develop and validate an advanced data pre-processing procedure for the PIXIRAD-8 CdTe detector array.
  • To address artifacts arising from detector gaps, edge pixels, and temporal gain variations.
  • To improve image quality for synchrotron radiation-based breast CT applications.

Main Methods:

  • An ad hoc pre-processing procedure was developed for an eight-module PIXIRAD-8 CdTe detector array.
  • The procedure includes dynamic flat-fielding, gap seaming, dynamic ring removal, projection despeckling, and around-gap equalization.
  • The method's dynamic nature provides projection-index-dependent corrections.

Main Results:

  • The pre-processing procedure effectively mitigated artifacts from inter-module gaps and time-dependent gain variations.
  • Phase-contrast CT images of a human breast specimen demonstrated the effectiveness of the corrections.
  • Preservation of key image features, including phase effects, was achieved.

Conclusions:

  • The developed dynamic pre-processing procedure significantly enhances the performance of large-area CdTe detector arrays for CT imaging.
  • This method is vital for overcoming limitations in multi-module detector systems.
  • The technique shows great promise for low-dose, high-resolution imaging, particularly in synchrotron-based breast CT.