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Shielding a high-sensitivity digital detector from electromagnetic interference.

David E Hintenlang1, Xia Jiang1, Kevin J Little1

  • 1Department of Radiology, Ohio State University Wexner Medical Center, Columbus, OH, USA.

Journal of Applied Clinical Medical Physics
|June 17, 2018
PubMed
Summary
This summary is machine-generated.

High-sensitivity digital mammography systems can be shielded from electromagnetic interference (EMI) using aluminum shielding. This study successfully reduced AC magnetic fields, preventing imaging artifacts in digital breast tomosynthesis (DBT) systems.

Keywords:
digital detectorelectromagneticinterferencemammographyshielding

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Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Radiological Imaging Technology

Background:

  • High-sensitivity digital mammography systems, including digital breast tomosynthesis (DBT), are susceptible to imaging artifacts.
  • Electromagnetic interference (EMI), specifically AC magnetic fields, can exceed manufacturers' tolerances, compromising image quality.
  • Understanding and mitigating sources of EMI is crucial for reliable diagnostic imaging.

Purpose of the Study:

  • To document the shielding of a high-sensitivity digital mammography system detector from AC magnetic fields.
  • To address concerns regarding EMI-induced artifacts in digital breast tomosynthesis (DBT) imaging.
  • To verify the effectiveness of a proposed shielding design and installation for extremely low-frequency (ELF) EMI.

Main Methods:

  • Preliminary site evaluation and subsequent measurements of AC magnetic fields using digital detector arrays from multiple manufacturers.
  • Spatial and temporal mapping of AC magnetic fields to identify sources and variations.
  • Development of a shielding model to understand ELF EMI physics and verify commercial shielding solutions.
  • Post-shielding measurements to assess the reduction of EMI fields.

Main Results:

  • Preshielding measurements revealed AC magnetic fields significantly exceeding tolerances for artifact-free DBT imaging.
  • EMI fields exhibited temporal variations, with some locations routinely exceeding 30 mG and occasionally reaching over 100 mG.
  • A shielding solution primarily consisting of 6.35 mm thick aluminum was installed.
  • Post-shielding measurements demonstrated a significant reduction in EMI fields, generally below 0.5 mG, effectively dampening temporal variations.
  • Subsequent DBT system installation and evaluation showed no imaging artifacts.

Conclusions:

  • Successful shielding of ELF EMI requires understanding physical principles not always common in medical physics.
  • Modern high-sensitivity digital detectors can be effectively shielded against EMI-induced imaging artifacts.
  • Careful application of shielding principles ensures artifact-free digital mammography imaging.