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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

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Published on: August 25, 2016

High-energy micrometre-scale pixel direct conversion X-ray detector.

Christopher C Scott¹, Michael Farrier², Yunzhe Li¹

¹KA Imaging Inc., 560 Parkside Drive, Unit 3, Waterloo, Ontario, Canada N2L 5Z4.

Journal of Synchrotron Radiation

|July 2, 2021

Summary

This summary is machine-generated.

This study presents a new X-ray imaging detector with micrometer pixels and high efficiency for hard X-rays. The amorphous selenium/CMOS technology offers advanced capabilities for synchrotron imaging applications.

Keywords:

amorphous selenium high-energy X-ray detector micrometre-scale spatial resolution

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Area of Science:

Medical Imaging
Materials Science
Physics

Background:

Current X-ray detectors have limitations for high-energy synchrotron applications.
Need for detectors with micrometer-scale pixel dimensions and high efficiency above 20 keV.

Purpose of the Study:

To fabricate and characterize a novel X-ray imaging detector.
To achieve micrometer-scale pixel dimensions and high detection efficiency for hard X-rays (>20 keV).

Main Methods:

Fabrication of a monolithic hybrid detector using amorphous selenium deposited on a custom CMOS readout integrated circuit.
Characterization at the Advanced Photon Source synchrotron beamline 1-BM-B.
Performance evaluation including spatial resolution, linearity, responsivity, and lag.

Main Results:

Demonstrated micrometer-scale spatial resolution (8 µm) and 10% modulation transfer function at Nyquist frequency for 63 keV X-rays.
Achieved high detection efficiency for hard X-ray energies above 20 keV.
Observed phase contrast edge enhancement, indicating potential for advanced imaging techniques.

Conclusions:

The amorphous selenium/CMOS detector technology addresses limitations of current detectors for synchrotron applications (>50 keV).
Enables advanced techniques like phase contrast tomography and high-resolution imaging of nanoscale lattice distortions.
Facilitates novel synchrotron imaging applications at X-ray energies at or above 20 keV.