OC193: Quality control of fetal biometry: a statistical approach

Continuous independent quality control for fetal ultrasound biometry provided by the cumulative summation technique.

OBJECTIVE To apply the cumulative summation (CUSUM) technique for an evaluation of the learning process of sonographic fetal weight estimation at term in combination with the z-scores of biometry determinants and to assess the time of appearance and sources of errors. METHODS Learning curve (LC-CUSUM) and double CUSUM charts for systematic error detection based on absolute and signed mean per...

Statistical Methodology in Biometry

A New Statistical Approach for Recognizing and Classifying Patterns of Control Charts (RESEARCH NOTE)

Control chart pattern (CCP) recognition techniques are widely used to identify the potential process problems in modern industries. Recently, artificial neural network (ANN) –based techniques are very popular to recognize CCPs. However, finding the suitable architecture of an ANN-based CCP recognizer and its training process are time consuming and tedious. In addition, because of the black box ...

Ultrasound Biometry and Fetal Growth Restriction

With the ascendancy of biophysical assessment with Doppler velocimetry, and the establishment of routine scan dating in early pregnancy, there needs to be a radical re-think of the role of ultrasound biometry in the de®nition and assessment of fetal growth restriction (FGR). Doppler ̄ow velocimetry of the umbilical artery has proven its value in de®ning the FGR fetus. It is more useful than card...

Statistical Quality Control Procedures

Taguchi's emphasis on instilling quality at the design stage has been important in a number of situations and deserves careful attention. His specific robust design approach has yielded good results in many instances, but recent studies indicate that more classical designs can serve the same purposes-sometimes, at least, doing so more efficiently, albeit less understandably for the technically ...