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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Radiation exposure reduction using an equalization filter during percutaneous coronary intervention: a preliminary

Nao Ichikawa1, Atsushi Fukuda2, Takuma Hayashi3

  • 1Department of Radiological Technology, Faculty of Health Science, Kobe Tokiwa University, 2-6-2 Otani-cho, Nagata-ku, Kobe, Hyogo 653-0838, Japan.

Radiation Protection Dosimetry
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Summary

Equalization filters (EFs) significantly reduce radiation exposure for patients and physicians during percutaneous coronary interventions. These filters lower radiation doses without compromising X-ray output, enhancing safety in interventional fluoroscopy.

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Area of Science:

  • Medical Physics
  • Radiology
  • Interventional Cardiology

Background:

  • Percutaneous coronary intervention (PCI) involves significant radiation exposure for both patients and medical staff.
  • Minimizing radiation dose is crucial in interventional fluoroscopy procedures.
  • Equalization filters (EFs) are potential tools for radiation dose reduction.

Purpose of the Study:

  • To evaluate the effectiveness of equalization filters (EFs) in reducing radiation exposure.
  • To assess the impact of EFs on patient and physician radiation doses during PCI.
  • To determine if EFs affect X-ray output.

Main Methods:

  • Utilized an anthropomorphic phantom and an interventional fluoroscopy system.
  • Measured X-ray output using an ionization chamber and physician exposure with a solid-state survey meter.
  • Tested various EF positions ('Shallow', 'Deep', 'Both', 'Right', 'Left') at different distances and C-arm angulations.

Main Results:

  • Air kerma remained nearly identical with and without EFs.
  • EFs reduced kerma-area product and H*(10) by up to 27.4%.
  • The 'Deep' EF position demonstrated greater average H*(10) reduction than 'Shallow', with 'Both' > 'Left' > 'Right'.

Conclusions:

  • Equalization filters effectively reduce patient and physician radiation exposure during PCI.
  • EFs maintain diagnostic image quality by not significantly altering X-ray output.
  • Strategic placement of EFs, particularly 'Deep' and 'Both', optimizes radiation dose reduction.