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High-ratio grid considerations in mobile chest radiography.

Alexander W Scott1, David M Gauntt, Michael V Yester

  • 1Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35249, USA.

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High-ratio grids improve mobile chest X-ray image quality without increasing patient dose when aligned using the mobile radiography automatic grid alignment system (MRAGA). Fiber interspace grids generally outperformed aluminum interspace grids.

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Area of Science:

  • Radiologic Technology
  • Medical Imaging Physics
  • Diagnostic Radiology

Background:

  • Mobile chest radiography often omits grids or uses low-ratio, misaligned grids.
  • A novel mobile radiography automatic grid alignment system (MRAGA) ensures accurate focal spot-to-grid alignment.

Purpose of the Study:

  • To evaluate the trade-offs of using high-ratio grids in mobile chest radiography.
  • To assess image quality at a fixed patient dose with precise focal spot alignment.

Main Methods:

  • Utilized modified ANSI chest phantoms (medium and large) with contrast targets.
  • Compared five high-ratio grids (10:1-15:1, aluminum and fiber interspace) against nongrid exposures.
  • Employed MRAGA for alignment and computed radiography for image acquisition.
  • Quantified contrast-to-noise ratio (CNR) and CNR improvement factor (k(CNR)).

Main Results:

  • High-ratio grids increased CNR by 4%-65% compared to nongrid images at the same phantom dose.
  • Image quality improvement was more pronounced in larger phantoms and mediastinal targets.
  • Fiber interspace grids generally yielded superior results over aluminum interspace grids.
  • k(CNR) showed minimal dependence on kVp or grid ratio in the lung, but decreased with increasing kVp in the mediastinum.

Conclusions:

  • Accurate grid alignment with MRAGA enables high-ratio grids to enhance mobile chest radiography image quality without dose increase.
  • Fiber interspace grids demonstrated better performance than aluminum interspace grids.
  • Specific fiber grids (13:1 for medium, 15:1 for large phantoms) provided optimal results.