Selection of the sub-noise gain level for acquisition of VOCAL data sets: a reliability study

Ultrasound in Medicine & Biology
Jennifer SandersonA W Welsh

Abstract

This study was aimed at assessing the intra-observer and inter-observer repeatability of selecting the sub-noise gain (SNG) level when acquiring placental volumes with 3-D power Doppler for analysis using virtual organ computer-aided analysis (VOCAL). Sixty women with uncomplicated singleton pregnancies between 20 and 38 wk of gestation were recruited. Two women were excluded for flash artifact noted during image analysis. Two blinded observers independently adjusted gain to their perceived SNG level before acquiring a static 3-D volume of the placenta at the cord insertion; observers alternated after each acquisition until each had acquired two volumes. A single observer operated the probe at all times. During offline analysis, SNG levels were recorded and VOCAL indices were calculated. SNG exhibited excellent intra-observer and inter-observer reliability. Intra-observer intra-class correlation coefficients (95% confidence intervals) were 0.98 (0.97-0.99) and 0.98 (0.98-0.99) for observers 1 and 2, respectively. The inter-observer intra-class correlation coefficient was 0.96 (0.93-0.98). Despite its perceived inherent subjectivity, the excellent intra-class correlation coefficients obtained in this study support SNG as a promi...Continue Reading

References

Nov 11, 2005·Clinical Trials : Journal of the Society for Clinical Trials·John M Lachin
Feb 29, 2008·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·J W Bartlett, C Frost
Aug 30, 2008·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·N J Raine-FenningI R Johnson
Jan 20, 2010·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·W P MartinsC O Nastri
May 28, 2011·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·K Å SalvesenK Maršál

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Citations

Oct 14, 2014·Journal de gynécologie, obstétrique et biologie de la reproduction·J DuanO Morel
Jun 16, 2016·Pediatric Research·Tim SchindlerAlec Welsh
Aug 20, 2018·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Nadav SchwartzChandra M Sehgal

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