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Related Experiment Videos

Mediastinal abnormalities: detection with storage phosphor digital radiography.

C M Schaefer1, R Greene, D A Hall

  • 1Department of Radiology I, Medizinische Hochschule Hannover, Federal Republic of Germany.

Radiology
|January 1, 1991
PubMed
Summary

Digital radiography post-processing algorithms improved mediastinal lesion detection compared to film radiography. However, these optimized algorithms were inferior for detecting pulmonary lesions.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Digital radiography

Background:

  • Conventional film radiography (FR) is a standard imaging technique.
  • Storage phosphor digital radiography (SR) offers post-processing capabilities.
  • Optimizing SR algorithms is crucial for diagnostic accuracy.

Purpose of the Study:

  • To compare the diagnostic performance of conventional film radiography (FR) with various post-processing algorithms of storage phosphor digital radiography (SR).
  • To evaluate the effectiveness of specific SR image parameter adjustments for detecting mediastinal and pulmonary lesions.

Main Methods:

  • Sixty patients with 40 mediastinal and 30 pulmonary lesions underwent chest computed tomography (CT).
  • Six SR post-processing algorithms were tested, including adjustments for gray-scale, optical density, gradation curves, and edge enhancement.

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  • Reader performance was assessed using the area under the receiver operating characteristic curve (Az) for 5,040 observations.

    • Main Results:

    • SR with high-frequency edge enhancement and density optimization significantly improved mediastinal lesion detection over FR (Az = .80 vs .73).
    • Gray-scale reversal significantly decreased SR performance (Az = .64).
    • SR algorithms optimized for the mediastinum were significantly inferior to FR for detecting pulmonary lesions.

    Conclusions:

    • Specific post-processing techniques, like edge enhancement and density optimization, can enhance SR's utility for mediastinal lesion detection.
    • Careful algorithm selection is necessary, as mediastinum-optimized SR algorithms underperform FR for pulmonary lesion detection.