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Reproducibility of three-dimensional power Doppler placental vascular indices in pregnancies between 26 and 35 weeks

Reproducibility of three-dimensional power Doppler placental vascular indices in pregnancies between 26 and 35 weeks,10.1007/s00404-009-1341-4,Archive

Reproducibility of three-dimensional power Doppler placental vascular indices in pregnancies between 26 and 35 weeks   (Citations: 4)
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Purpose  Assess intra and interobserver reproducibility of three-dimensional power Doppler (3DPD) placental vascular indices in normal pregnancies between 26 and 35 weeks. Methods  Thirty 3D volumes were captured by one observer and stored for analysis. Vascularization index (VI), flow index (FI) and vascularization flow index (VFI) were calculated from the spherical placental tissue samples obtained through the automatic Virtual Organ Computer-aided AnaLysis (VOCAL). Two observers analyzed the stored volumes and calculated the indices and their findings were compared. Intraclass correlation coefficients (ICCs) were used to analyze intra and interobserver correlations. Data were analyzed using confidence intervals, reliability coefficients and Bland–Altman graphs with concordance limits. Results  All three indices had good intra and interobserver reproducibility. Intraobserver ICCs for the three indices were >0.90. The FI had the highest ICC (0.99), the highest interobserver ICC (0.98) and the best concordance on the Bland–Altman graphs. Conclusion  3DPD placental vascular indices obtained using the automatic sphere mode had a good intra and interobserver reproducibility for pregnancies between 26 and 35 weeks. The FI obtained the highest reproducibility scores.
Journal: Archives of Gynecology and Obstetrics - ARCH GYNECOL OBSTET , vol. 283, no. 2, pp. 213-217, 2011
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    • ...A recent study of reproducibility of three-dimensional power Doppler placental vascular indices was evaluated in normal pregnancies between 26 and 35 weeks [27]...

    Chih-Yen Chenet al. Evaluation of placental maturity by the sonographic textures

    • ...We read with great interest the article by Guimaraes Filho et al. [1], evaluating the intra and inter observer reproducibility of 3D power Doppler...
    • ...When reading the paper by Guimaraes Filho et al. [1], one may observe that only the reproducibility of the analysis was evaluated: the 3D datasets were acquired by a single observer in only one occasion per subject...
    • ...Even though, the results presented by Guimareas Filho et al. [1] are not meaningless and the great majority of the published papers regarding the reproducibility of 3D power Doppler evaluated only the reproducibility of the analysis of pre acquired 3D data-sets; e.g., ovarian tumors [3], thyroid gland [4], and even a previous publication about intra observer reproducibility of placenta [5]...
    • ...The results of these two studies are then reassuring about 3D power Doppler indice reproducibility, even when diVerent acquisitions are performed, and corroborate with Guimaraes Filho et al.’s [1] conclusions...
    • ...By not considering the inXuence of acquisition and region selection, the ICC values provided by Guimares Filho et al. [1] cannot be considered as the “true” reproducibility of 3D power Doppler evaluation of the placenta...
    • ...Reading more deeply the study by Lai et al. [2] whose conclusions about the reproducibility of VOCAL 3D power Doppler indexes from placenta were exactly the opposite of the conclusions by Guimaraes Filho et al. [1], one may Wnd another important issue regarding inter observer reproducibility...

    Wellington P. Martinset al. Reproducibility of 3D power Doppler placental vascular indices

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