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Assessment of Child Anthropometry in a Large Epidemiologic Study
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Image-scoring system for crown-rump length measurement.

S Z Wanyonyi1, R Napolitano, E O Ohuma

  • 1Nuffield Department of Obstetrics & Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, UK.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|March 29, 2014
PubMed
Summary

A new objective scoring system for fetal crown-rump length (CRL) ultrasound images shows higher reproducibility than subjective assessments. This method improves quality control in obstetric imaging.

Keywords:
crown-rump lengthimage scoringobjective evaluationreproducibilitysubjective evaluation

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Area of Science:

  • Medical Imaging
  • Obstetrics
  • Fetal Development

Background:

  • Accurate crown-rump length (CRL) measurement is crucial for gestational age estimation.
  • Subjective assessment of ultrasound image quality for CRL can be inconsistent.

Purpose of the Study:

  • To develop and validate an objective, six-point image-scoring system for CRL measurements.
  • To compare the reproducibility of this objective system against subjective image quality assessment.

Main Methods:

  • 125 CRL ultrasound images were evaluated by two blinded reviewers.
  • Images were assessed using both subjective (acceptable/unacceptable) and objective (six criteria) methods.
  • Agreement was quantified using percentage agreement and adjusted kappa statistics.

Main Results:

  • The objective scoring system achieved higher overall reviewer agreement (95.2%) compared to subjective assessment (77.6%).
  • High agreement was observed for specific objective criteria like horizontal position and magnification.
  • Moderate to poor agreement was noted for mid-sagittal section and neutral position criteria.

Conclusions:

  • The proposed six-point objective scoring system demonstrates superior reproducibility for CRL image rating.
  • This objective system is recommended for quality assessment and auditing in obstetric ultrasound practices.