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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Spectroscopy with a CdTe-based photon-counting imaging detector (PCD) having charge sharing correction capability.

A Shankar1, J Krebs1, D R Bednarek1

  • 1Toshiba Stroke & Vascular Research Center, University at Buffalo, Buffalo, NY.

Proceedings of Spie--The International Society for Optical Engineering
|June 15, 2018
PubMed
Summary
This summary is machine-generated.

The upgraded XCounter Actaeon photon counting detector (PCD) with its Anti-Coincidence Circuit (ACC) On mode accurately measures X-ray spectra. This mode, featuring charge sharing correction, is ideal for dual-energy imaging applications.

Keywords:
Anti-Charge Sharing CorrectionDual Energy ImagingMaterial SeparationPhoton Counting Detectors (PCD)Spectroscopy

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Area of Science:

  • Medical Physics
  • Detector Technology
  • Spectroscopy

Background:

  • Photon Counting Detectors (PCDs) are crucial for X-ray imaging.
  • CdTe-based direct conversion PCDs with small pixels (100 μm) can experience charge sharing.
  • Accurate spectral information is vital for advanced imaging techniques.

Purpose of the Study:

  • To evaluate the spectroscopic performance of an upgraded prototype imaging photon counting detector, the XCounter Actaeon.
  • To assess the impact of different acquisition modes, particularly the Anti-Coincidence Circuit (ACC) On mode with charge sharing correction.
  • To determine the suitability of the detector for dual-energy applications.

Main Methods:

  • Investigated four acquisition modes of the XCounter Actaeon PCD, including ACC On mode with charge sharing correction.
  • Obtained X-ray spectra by sequentially adjusting energy thresholds on the detector's discriminators.
  • Verified energy calibration using an Am-241 source and acquired spectra at various kVps from a medical X-ray generator.
  • Evaluated dual-energy imaging capability for material decomposition (Aluminum and Iodine).

Main Results:

  • Spectra from the ACC On mode, which corrects for charge sharing, closely matched theoretically predicted spectra.
  • The ACC On mode demonstrated superior accuracy compared to other acquisition modes.
  • Energy calibration was successfully verified using an Am-241 source.
  • Dual-energy imaging successfully separated Aluminum and Iodine in a phantom, indicating potential for material differentiation.

Conclusions:

  • The XCounter Actaeon PCD's ACC On mode provides accurate spectroscopic measurements, especially for medical X-ray energies where charge sharing is prevalent.
  • The charge sharing correction in ACC On mode is essential for achieving spectral accuracy.
  • The detector's ACC On mode is highly suitable for dual-energy applications, including material decomposition for medical imaging.