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Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Related Experiment Video

Updated: Jul 6, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
14:19

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

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Digital radiography using amorphous selenium: photoconductively activated switch (PAS) readout system.

Nikita Reznik1, Philip T Komljenovic, Stephen Germann

  • 1Imaging Research, Sunnybrook Health Sciences Centre, Department of Medical Biophysics, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario, M4N 3M5, Canada. nik@sri.utoronto.ca

Medical Physics
|April 15, 2008
PubMed
Summary
This summary is machine-generated.

A new amorphous selenium digital radiography detector uses a novel photoconductively activated switch (PAS) method. This advanced readout technique significantly reduces readout times and noise in digital x-ray imaging.

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Area of Science:

  • Medical Imaging
  • Materials Science

Background:

  • Conventional amorphous selenium (a-Se) digital radiography detectors store charge images on electrode pixels.
  • Existing bulk photoinduced discharge (PID) methods for readout have limitations like long readout times and high noise.

Purpose of the Study:

  • To introduce a novel photoconductively activated switch (PAS) readout method for a-Se digital radiography detectors.
  • To address and overcome the inherent weaknesses of traditional PID readout methods.

Main Methods:

  • Investigated photoconduction properties of the a-Se surface.
  • Determined the geometrical design for electrode pixels in a PAS radiography system.
  • Implemented and evaluated a single-pixel PAS system.

Main Results:

  • The PAS method demonstrated reproducible, linear dependence of x-ray induced charge signal on exposure.
  • Achieved rapid pixel discharge (10 ms).
  • A complete 40 cm x 40 cm image readout in 30 seconds was demonstrated, with potential for faster readout.

Conclusions:

  • The PAS readout method offers a revolutionary modification to a-Se detector technology.
  • It maintains high resolution and structural simplicity while eliminating PID weaknesses.
  • a-Se detectors with PAS readout show promise for practical integrated digital radiography systems.