Comparison of inter‐ and intraobserver agreement and reliability between three different types of placental volume measurement technique (XI VOCAL™, VOCAL™ and multiplanar) and validity in the in‐vitro setting

Cheong, K. B.; Leung, K. Y.; Li, T. K. T.; Chan, H. Y.; Lee, Y. P.; Tang, M. H. Y.

doi:10.1002/uog.7609

Cited by 45Ultrasound in Clinical ApplicationsPrenatal Screening and DiagnosticsPregnancy and preeclampsia studies

Comparison of inter‐ and intraobserver agreement and reliability between three different types of placental volume measurement technique (XI VOCAL™, VOCAL™ and multiplanar) and validity in the in‐vitro setting

Cheong, K. B., Leung, K. Y., Li, T. K. T., Chan, H. Y., Lee, Y. P., Tang, M. H. Y.·2010·Ultrasound in Obstetrics & Gynecology

DOI 10.1002/uog.7609

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Abstract

OBJECTIVES: To compare XI VOCAL (eXtended Imaging Virtual Organ Computer-aided AnaLysis) for three-dimensional (3D) ultrasound volumetry of the placenta and of phantom objects with a rotational method using VOCAL and with the multiplanar method. METHODS: We acquired 3D volume datasets from 32 fetuses at 11-14 weeks' gestation. Placental volume was calculated twice by each of two observers using XI VOCAL (with 5, 10, 15 and 20 slices), multiplanar (1-mm interval) and VOCAL (with 12 degrees, 18 degrees and 30 degrees rotation) methods. In addition, validity was assessed using the in-vitro setting with three phantom objects of known volume. RESULTS: Both inter- and intraobserver reliabilities were very high for all three methods. There was no systematic bias between any two methods except between XI VOCAL (10 slices) and the multiplanar (1-mm interval) method, with a smaller volume using the former method. The limits of agreement were wide between any two of the three methods. In the in-vitro setting, there was a trend towards less valid measurements with the XI VOCAL technique and fewer slices. With the same number of steps, measurements made with VOCAL (12 degrees and 18 degrees) were more valid than were those made with XI VOCAL (15 and 10 slices, respectively). CONCLUSION: XI VOCAL cannot be used interchangeably with VOCAL or multiplanar techniques in measuring placental volume at 11-14 weeks' gestation.

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There is uncertainty regarding the repeatability and reproducibility of volume results produced using VOCALTM, with certain iterations producing less reliable results.
“There is also some uncertainty regarding the repeatability and reproducibility of volume results produced using this method, with certain iterations of the VOCAL™ software producing less reliable results [36].”
From Volume and vascularity: Using ultrasound to unlock the secrets of the first trimester placenta (2019) · cites this paper as [36]

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P09.01: Comparison of inter- and intraobserver agreement between three different types of placental volume measurement techniques (XI VOCAL™, VOCAL™, and multiplanar)
Cheong, K. B., Leung, K. Y., Li, T. K., Chan, H. Y., Lee, Y. P., & Tang, H. Y. (2009) · Ultrasound in Obstetrics and Gynecology · doi:10.1002/uog.7123
OP34.05: Comparison of inter‐ and intraobserver agreement and reproducibility between three different types of fetal and placenta volume measurement techniques (XI VOCAL™, VOCAL™ and multiplanar), and the validity in the in vitro setting
Leung, K. Y., Cheong, K. B., Li, T. K., Chan, H. Y., Lee, Y., & Tang, M. H. Y. (2010) · Ultrasound in Obstetrics and Gynecology · doi:10.1002/uog.8247
Comparison of inter‐ and intraobserver agreement between three types of fetal volume measurement technique (XI VOCAL™, VOCAL™ and multiplanar)
Cheong, K. B., Leung, K. Y., Chan, H. Y., Lee, Y. P., Yang, F., & Tang, M. H. Y. (2009) · Ultrasound in Obstetrics and Gynecology · doi:10.1002/uog.6255 · Cited by 32 · see citing works
P25.06: Comparison of inter‐ and intra‐observer agreement between three different types of fetal volume measurement techniques (XI VOCAL, VOCAL, and multiplanar)
Cheong, K. B., Leung, K. Y., Chan, H. Y., Lee, Y. P., Yang, F., & Tang, M. H. Y. (2008) · Ultrasound in Obstetrics and Gynecology · doi:10.1002/uog.5902
Reproducibility of 3-Dimensional Ultrasound Measurements of Placental Volume at Gestational Ages 11 - 14 Weeks.
(2015) · PubMed Central · Cited by 3 · see citing works

Authors: Cheong, K. B., Leung, K. Y., Li, T. K. T., Chan, H. Y., Lee, Y. P., & Tang, M. H. Y.
Affiliations: Queen Mary Hospital (CN)
Tsan Yuk Hospital (CN)
Corresponding author: Leung, K. Y.
ORCID: Cheong, K. B.
Leung, K. Y.
Li, T. K. T.
Tang, M. H. Y.
Venue: Ultrasound in Obstetrics & Gynecology
Publisher: Wiley
Published: 2010-07-28
Volume: 36
Issue: 2
Pages: 210-217
ISSN: 0960-7692 (ISSN-L)
1469-0705
DOI: 10.1002/uog.7609
OpenAlex: W2007900078
Cited by: 45
References: 31
Citations by year: 2026: 1 · 2025: 2 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 5 · 2013: 3 · 2012: 6
FWCI: 3.69
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Ultrasound in Obstetrics and Gynecology (publishedVersion)
PubMed (publishedVersion)
The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
Topics: Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Ultrasound in Clinical Applications
Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Screening and Diagnostics
Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
Keywords: placental volume, VOCAL, multiplanar reconstruction, interobserver agreement, intra-rater reliability, phantom validation, early pregnancy
MeSH terms: Female, Gestational Age, Humans, Image Processing, Computer-Assisted, Placenta, Pregnancy, Reproducibility of Results, Observer Variation, Ultrasonography, Prenatal, Phantoms, Imaging, Imaging, Three-Dimensional, Fetal Development

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Comparison of inter‐ and intraobserver agreement and reliability between three different types of placental volume measurement technique (XI VOCAL™, VOCAL™ and multiplanar) and validity in the in‐vitro setting

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