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Related Experiment Videos

Computed sonography: requiem to echogenicity assessment?

I Blickstein1, M Smith-Levitin, E Gurewitsch

  • 1Department of Obstetrics and Gynecology, Kaplan Hospital, Rehovot, Israel.

Gynecologic and Obstetric Investigation
|January 1, 1997
PubMed
Summary
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Image parameter manipulation in ultrasound imaging significantly impacts image density, complicating accurate echogenicity assessment. Adjustments in gain, log compression, and postprocessing alter results, hindering reliable fetal liver echogenicity evaluation.

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Fetal Sonography

Background:

  • Accurate assessment of tissue echogenicity in fetal sonography is crucial for diagnostic interpretation.
  • Understanding the influence of various ultrasound image parameters on image density is essential for reliable measurements.

Purpose of the Study:

  • To investigate the impact of specific ultrasound image parameters on image density within a fetal liver model.
  • To determine which parameters significantly affect objective image density measurements and confound echogenicity assessment.

Main Methods:

  • Systematic evaluation of gain settings, log compression, persistence, preprocessing, and postprocessing on image density.
  • Objective measurement of image density using electrooptical transmission densitometry on transparent film output.

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  • Each parameter was analyzed individually while others remained constant.

    • Main Results:

    • Postprocessing significantly altered mean image density (p < 0.02), acting as a confounder for echogenicity assessment.
    • A strong linear relationship between image density and gain setting was confirmed (r = -0.94 to -0.997).
    • Log compression settings significantly modified the gain-density relationship (p < 0.0000001), preventing image density calibration.

    Conclusions:

    • Manipulation of ultrasound image parameters, particularly postprocessing and log compression, significantly impacts image density.
    • Computed sonographic technology adjustments can obviate accurate echogenicity assessment in fetal liver imaging.
    • Standardization of image parameter settings is critical for reproducible and reliable ultrasound diagnostics.