A CRITICAL EVALUATION OF SONAR “CROWN‐RUMP LENGTH” MEASUREMENTS

@article{Robinson1975ACE,
  title={A CRITICAL EVALUATION OF SONAR “CROWN‐RUMP LENGTH” MEASUREMENTS},
  author={Herman P. Robinson and J. E. E. Fleming},
  journal={BJOG: An International Journal of Obstetrics \& Gynaecology},
  year={1975},
  volume={82}
}
In a study to evaluate the reproducibility and accuracy of the sonar technique of measurement of the in vivo fetal crown‐rump length (Robinson, 1973), a series of in vivo and in vitro experiments was performed in which the random and systematic errors inherent in the technique were assessed. The potential sources of random error were those of operator judgement, movement of the fetus and mother, machine sensitivity settings and measurement from the photograph; while the sources of systematic… 
A COMPARISON OF CROWN‐RUMP LENGTH MEASUREMENTS USING A REAL‐TIME SCANNER IN AN ANTENATAL CLINIC AND A CONVENTIONAL B‐SCANNER
TLDR
In a series of 168 patients in the first trimester of pregnancy, fetal crown‐rump length (CRL) measurements were attempted in the Antenatal Clinic using a linear‐array real‐time ultrasound scanner, and a good correlation was obtained.
THE REPRODUCIBILITY OF FETAL CROWN RUMP LENGTH MEASUREMENTS OBTAINED WITH REAL TIME ULTRASOUND SYSTEMS COMPARED WITH THOSE OF A CONVENTIONAL B‐SCANNER
Comparison of the reproducibility of fetal crown rump length measurements (CRL) obtained in a resting state by sonar with a phase focused linear array real time scanner, a real time mechanical sector
Interobserver variability. A source of error in obstetric ultrasound.
  • I. Zador, R. Sokol, L. Chik
  • Medicine
    Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
  • 1988
Several sources of error encountered in obstetrical ultrasound examination have been analyzed from a computerized ultrasound database. The variability in measuring fetal landmarks and visualization
Standardisation of crown–rump length measurement
TLDR
These methods should minimise potential systematic errors in dating associated with pooling data from different health institutions, and represent a model for standardising CRL measurement in future studies.
Comparison of methods for determining crown‐rump measurement by real‐time ultrasound
TLDR
The fetal CRM appears to be a valid and accurate assessment of gestational age and Robinson's data listed as “regression analysis values” are suggested for application to real‐time ultrasound.
Forty years of obstetric ultrasound 1957-1997: from A-scope to three dimensions.
Crown-rump length measurements revisited.
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References

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TLDR
A normal curve of fetal crown-rump length was derived from 214 examinations on 80 patients and by using these values in a further “blind” series it was found possible to predict the maturity of pregnancy to within three days, between the sixth and the 14th weeks of pregnancy.
Detection of Fetal Heart Movement in First Trimester of Pregnancy using Pulsed Ultrasound
A method is reported by which the presence or absence of fetal heart movement may be reliably detected by an abdominal approach from the 48th day of pregnancy onwards (menstrual age). The technique
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