Three-dimensional Doppler evaluation of single spherical samples from the placenta: intra- and interobserver reliability

Authors

  • W. P. Martins,

    Corresponding author
    1. Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (FMRP-USP), Ribeirão Preto, Brazil
    2. Escola de Ultra-sonografia e Reciclagem Médica de Ribeirão Preto (EURP), Ribeirão Preto, Brazil
    3. Instituto Nacional de Ciência e Tecnologia (INCT) de Hormônios e Saúde da Mulher, Ribeirão Preto, Brazil
    • Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, 8 andar., Ribeirão Preto, São Paulo, Brazil. CEP: 14049-900
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  • J. C. Lima,

    1. Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (FMRP-USP), Ribeirão Preto, Brazil
    2. Escola de Ultra-sonografia e Reciclagem Médica de Ribeirão Preto (EURP), Ribeirão Preto, Brazil
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  • A. W. Welsh,

    1. School of Women's & Children's Health, University of New South Wales, Sydney, Australia
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  • E. Araujo,

    1. Department of Obstetrics, São Paulo Federal University (UNIFESP), São Paulo, Brazil
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  • A. H. Miyague Jr,

    1. Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (FMRP-USP), Ribeirão Preto, Brazil
    2. Escola de Ultra-sonografia e Reciclagem Médica de Ribeirão Preto (EURP), Ribeirão Preto, Brazil
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  • F. M. Filho,

    1. Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (FMRP-USP), Ribeirão Preto, Brazil
    2. Escola de Ultra-sonografia e Reciclagem Médica de Ribeirão Preto (EURP), Ribeirão Preto, Brazil
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  • N. J. Raine-Fenning

    1. Division of Obstetrics & Gynaecology, School of Human Development, University of Nottingham, Nottingham, UK
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Errata

This article is corrected by:

  1. Errata: Erratum Volume 42, Issue 6, 728, Article first published online: 24 November 2013

Abstract

Objective

To evaluate the intra- and interobserver reliability of assessment of three-dimensional power Doppler (3D-PD) indices from single spherical samples of the placenta.

Methods

Women with singleton pregnancies at 24–40 weeks' gestation were included. Three scans were independently performed by two observers; Observer 1 performed the first and third scan, intercalated by the scan of Observer 2. The observers independently analyzed the 3D-PD datasets that they had previously acquired using four different methods, each using a spherical sample: random sample extending from basal to chorionic plate; random sample with 2 cm3 of volume; directed sample to the region subjectively determined as containing more color Doppler signals extending from basal to chorionic plate; or directed sample with 2 cm3 of volume. The vascularization index (VI), flow index (FI) and vascularization flow index (VFI) were evaluated in each case. The observers were blinded to their own and each other's results. Additional evaluation was performed according to placental location: anterior, posterior and fundal or lateral. Intra- and interobserver reliability was assessed by intraclass correlation coefficients (ICC).

Results

Ninety-five pregnancies were included in the analysis. All three placental 3D-PD indices showed only weak to moderate reliability (ICC < 0.66 and ICC < 0.48, intra- and interobserver, respectively). The highest values of ICC were observed when using directed spherical samples from basal to chorionic plate. When analyzed by placental location, we found lower ICCs for lateral and fundal placentae compared to anterior and posterior ones.

Conclusion

Intra- and interobserver reliability of assessment of placental 3D-PD indices from single spherical samples in pregnant women greater than 24 weeks' gestation is poor to moderate, and clinical usefulness of these indices is likely to be limited. Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd.

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