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Related Experiment Videos

Temporal performance of amorphous selenium mammography detectors.

Bo Zhao1, Wei Zhao

  • 1Department of Radiology, State University of New York at Stony Brook, L-4 Health Science Center, Stony Brook, New York 11794-8460, USA. bzhao@clio.rad.sunysb.edu

Medical Physics
|February 22, 2005
PubMed
Summary

This study quantifies temporal performance in amorphous selenium (a-Se) detectors for mammography. Positively biased a-Se detectors exhibit better lag and ghosting performance than negatively biased ones, crucial for clear imaging.

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Area of Science:

  • Medical Physics
  • Materials Science
  • Radiological Imaging

Background:

  • Mammographic imaging relies on high-quality detectors for accurate diagnosis.
  • Temporal performance metrics like lag and ghosting are critical for detector fidelity.
  • Amorphous selenium (a-Se) is a key material in direct-conversion mammography detectors.

Purpose of the Study:

  • To quantify the inherent lag and ghosting of amorphous selenium (a-Se) photoconductors.
  • To investigate the influence of imaging conditions, specifically electric field strength (E(Se)) and cumulative exposure, on temporal performance.
  • To compare the temporal performance of positively and negatively biased a-Se detector samples.

Main Methods:

  • Experiments were conducted using two small-area electroded a-Se samples with differing bias.

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  • Lag and ghosting were measured by delivering mammography-like x-ray exposures and monitoring photocurrent.
  • Ghosting quantified as x-ray sensitivity reduction; lag measured as residual current post-exposure.

    • Main Results:

    • Ghosting increased with cumulative exposure and decreased with higher electric field strength (E(Se)).
    • Lag showed varied dependence on E(Se) and cumulative exposure; positively biased samples had lower lag (0.2%-1.7%) than negatively biased (0.5%-8%) at E(Se) <= 10 V/µm.
    • Positively biased a-Se detectors demonstrated superior temporal performance due to lower trapped electron density.

    Conclusions:

    • The temporal performance of a-Se detectors is significantly influenced by bias, electric field strength, and cumulative exposure.
    • Positively biased a-Se detectors offer better lag and ghosting characteristics, essential for reducing image artifacts in mammography.
    • Longer time intervals between exposures facilitate ghosting recovery by neutralizing trapped charges.