Multiscale image processing and antiscatter grids in digital radiography

Winnie Y. Lo, William J. Hornof, Allison Zwingenberger, Ian D. Robertson

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Scatter radiation is a source of noise and results in decreased signal-to-noise ratio and thus decreased image quality in digital radiography. We determined subjectively whether a digitally processed image made without a grid would be of similar quality to an image made with a grid but without image processing. Additionally the effects of exposure dose and of a using a grid with digital radiography on overall image quality were studied. Thoracic and abdominal radiographs of five dogs of various sizes were made. Four acquisition techniques were included (1) with a grid, standard exposure dose, digital image processing; (2) without a grid, standard exposure dose, digital image processing; (3) without a grid, half the exposure dose, digital image processing; and (4) with a grid, standard exposure dose, no digital image processing (to mimic a film-screen radiograph). Full-size radiographs as well as magnified images of specific anatomic regions were generated. Nine reviewers rated the overall image quality subjectively using a five-point scale. All digitally processed radiographs had higher overall scores than nondigitally processed radiographs regardless of patient size, exposure dose, or use of a grid. The images made at half the exposure dose had a slightly lower quality than those made at full dose, but this was only statistically significant in magnified images. Using a grid with digital image processing led to a slight but statistically significant increase in overall quality when compared with digitally processed images made without a grid but whether this increase in quality is clinically significant is unknown.

Original languageEnglish (US)
Pages (from-to)569-576
Number of pages8
JournalVeterinary Radiology and Ultrasound
Volume50
Issue number6
DOIs
StatePublished - Nov 2009

Keywords

  • Antiscatter grid
  • Exposure dose
  • Image processing
  • Image quality
  • Multifrequency
  • Multiscale

ASJC Scopus subject areas

  • veterinary(all)

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