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Four-dimensional STIC / Volumetric Doppler impedance indices from spherical samples of the placenta: intra-observer reliability study and correlation with conventional umbilical artery Doppler indices.
MedLine Citation:
PMID:  22302650     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Objective Volumetric impedance indices derived from Spatio-Temporal Imaging Correlation (STIC) power Doppler (PD) might overcome the influence of machine settings and attenuation. We examine the application of these indices to anterior placentas in healthy pregnancies, assessing their feasibility, intra-observer reliability and correlation with conventional umbilical artery (UA) impedance indices. Methods Uncomplicated singleton pregnancies with anterior placenta were included. A single observer evaluated UA pulsatility index (PI), resistance index (RI) and systolic:diastolic ratio (S/D) and acquired three STIC PD datasets from placenta just above the placental cord. Another single observer analyzed the STIC PD datasets and spherical samples from basal to chorionic plate from every frame to determine the vascularization index (VI) and vascularization-flow index (VFI): maximum, minimum and average values were used to determine the 3 volumetric impedance indices (vP;vRI;vS/D). Intra-observer reliability was examined by intraclass correlation coefficients (ICC) and association between volumetric indices from placenta and UA Doppler indices was assessed by Pearson's correlation. Results 25 pregnant women were evaluated but 5 were excluded because of artifacts observed during analysis. The reliability of volumetric indices for both VI and VFI assessed between the three STIC PD data-sets were similar with all ICC ≥ 0.78. Pearson's r-values showed a weak and non significant correlation between UA PWD indices and their respective volumetric indices from spherical samples of placenta (all r ≤ 0.23). VOCAL indices from specific phases of the cardiac cycle showed good repeatability (ICC ≥ 0.92). Conclusion Volumetric impedance indices assessed from spherical samples of placenta are sufficiently reliable but they do not correlate with UA Doppler indices in healthy pregnancies. Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd.
Authors:
Alec W Welsh; Minsheng Hou; Neama Meriki; Wellington P Martins
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-3
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  -     ISSN:  1469-0705     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd.
Affiliation:
Division of Women's and Children's Health University of New South Wales Randwick, NSW Australia; Department of Maternal-Fetal Medicine Royal Hospital for Women, Randwick, NSW. alec.welsh@unsw.edu.au.
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