Three‐dimensional ultrasound fetal lung volume measurement: a systematic study comparing the multiplanar method with the rotational (VOCAL) technique

Kalache, Karim; Espinoza, Jimmy; Chaiworapongsa, Tinnakorn; Londoño, John; Schoen, Mary E.; Treadwell, M. C.; Lee, W.; Romero, Roberto

doi:10.1002/uog.39

Cited by 126 publications

(138 citation statements)

References 19 publications

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“…These findings suggest that fetal RVs do not differ in ethnically different populations and that both 3D-US volumetric methods produce similar results. In a previous publication on lung volume estimation in fetuses at risk for lung hypoplasia, Kalache et al [24] reported that the VOCAL method with a 30° rotation and the multiplanar method also yielded similar results.…”

Section: Discussionsupporting

confidence: 57%

Reference Range of Fetal Renal Volume by Three-Dimensional Ultrasonography Using the Vocal Method

et al. 2009

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Objective: To establish reference values for fetal renal volume by three-dimensional sonography using the VOCAL (Virtual Organ Computer-Aided Analysis) method. Methods: This prospective longitudinal study involved 57 healthy pregnant women who were examined between 24 and 34 weeks of pregnancy. Each fetal kidney was evaluated separately using the VOCAL method with a 30° rotation angle. For each gestational age, the following measures were obtained for the right and left kidneys: mean, standard deviation, minimum and maximum values, and the 5th, 10th, 25th, 50th, 75th and 90th percentiles. Polynomial regression models were constructed to assess the relationship between renal volume and gestational age, adjusted by the determination coefficient (R²). The Wilcoxon test was used to evaluate the concordance between the right and left renal volumes. Bland-Altman graphs were used to assess intra- and inter-observer variability. Results: The right renal volume increased from 4.5 ± 1.3 cm³ at 24 weeks to 12.1 ± 1.5 cm³ at 34 weeks. The left renal volume increased from 4.6 ± 0.8 cm³ at 24 weeks to 11.9 ± 1.1 cm³ at 34 weeks. There was a strong correlation between both the right and left renal volumes and gestational age (R² = 0.975 and 0.970, respectively). There were no significant differences between the right and left renal volumes. The mean difference between repeated measures by the same examiner was –0.07 cm³ (–0.88 to 0.75) for the right kidney and –0.21 cm³ (–0.95 to 0.75) for the left kidney. The mean difference between repeated measures obtained by two different examiners was –0.07 cm³ (–1.25 to 1.12) for the right kidney and 0 cm³ (–1.53 to 1.53) for the left kidney. Conclusion: Reference values were generated for fetal renal volume assessed by three-dimensional ultrasonography using the VOCAL method.

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Section: Discussionsupporting

confidence: 57%

Reference Range of Fetal Renal Volume by Three-Dimensional Ultrasonography Using the Vocal Method

et al. 2009

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“…Several studies have shown the clinical applicability of 3DUS to estimate fetal organs such as the liver, 13,14 lungs, 15,16 brain, 17 and limbs. 18 Raine-Fenning et al 19 compared the in vitro validity and reliability of different 3DUS methods in the assessment of volumes and reported that the multiplanar and VOCAL methods yielded similar results, although the rotational VOCAL was superior to the multiplanar method for irregularly shaped objects.…”

Section: Discussionmentioning

confidence: 99%

Reliability and Validity of In Vitro Volume Calculations by 3-Dimensional Ultrasonography Using the Multiplanar, Virtual Organ Computer-Aided Analysis (VOCAL), and Extended Imaging VOCAL Methods

Barreto

Milani

Júnior

et al. 2010

Journal of Ultrasound in Medicine

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Objective. The purpose of this study was to assess the reliability and validity of in vitro volume calculations by 3‐dimensional ultrasonography. Methods. This observational study was performed by 2 examiners to obtain volumes of 3 objects of different shapes and sizes filled with ultrasound gel and immersed in water. The examiners used the multiplanar (5‐mm interval), virtual organ computer‐aided analysis (VOCAL, 30°) and extended imaging (XI) VOCAL (5, 10, 15, and 20 planes) methods to estimate the volumes of each object. A paired Student t test (P) and intraclass correlation coefficients (ICCs) were used to assess reproducibility of the methods. Validity was assessed comparing the percent differences between the estimated and the real volumes using the P value, mean differences, and ICC for each method. Results. All methods were highly reliable and valid. There were no significant differences in interobserver variability; there was a strong interobserver correlation. There were no significant differences in the percent differences between the estimated and real volumes of the objects using the 3 methods. The XI VOCAL method was superior to the multiplanar and VOCAL methods in the measurement of irregularly shaped objects. The XI VOCAL method with 10 planes estimated volumes closest to the real volumes. Conclusions. All 3 methods were reliable and valid; however, XI VOCAL was superior to the other methods in the measurement of irregularly shaped objects.

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“…These include the planimetric, prolate ellipsoid volume, and ellipsoid volume measurement methods [13] . The accuracy of sonographic estimates of STV can be affected by several factors [19,20] , including the number of slices taken, the experience of the sonographer, intraobserver and interobserver variability, software, and image resolution and acquisition rates of the sonographic device. Comparison of methods has shown that both two-and three-dimensional techniques tend to underestimate the true volume [19] .…”

Section: Discussionmentioning

confidence: 99%

Prognostic Role of Tumor-Head Volume Ratio in Fetal Sacrococcygeal Teratoma

Filly

Cheong

et al. 2009

Fetal Diagn Ther

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Objective: To evaluate the ability of a tumor-head volume ratio to predict outcome and incidence of hydrops in fetuses with sacrococcygeal teratoma. Methods: Seventy-one sonograms were reviewed retrospectively from 28 fetuses with sacrococcygeal teratoma managed in our institution. Head volume (HV) and total tumor volume were calculated from sonograms. Amount of cystic tumor was estimated to determine solid tumor volume (STV) for the STV/HV ratio. Results: Twenty percent of sonograms with STV/HV <1 and 97.3% with STV/HV >1 were associated with 1 or more abnormal sonographic signs (p = 0.000). Overall mortality was 11/27 (41%). There was no mortality in fetuses with a ratio of <1, while 11/18 (61%) of fetuses with ratio >1 died (p = 0.003). Conclusion: The STV/HV ratio may be used to identify fetuses with a high risk of a poor outcome due to high-output cardiac failure and hydrops, and may help guide management.

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Three‐dimensional ultrasound fetal lung volume measurement: a systematic study comparing the multiplanar method with the rotational (VOCAL) technique

Abstract: Objectives

Cited by 126 publications

References 19 publications

Reference Range of Fetal Renal Volume by Three-Dimensional Ultrasonography Using the Vocal Method

Reference Range of Fetal Renal Volume by Three-Dimensional Ultrasonography Using the Vocal Method

Reliability and Validity of In Vitro Volume Calculations by 3-Dimensional Ultrasonography Using the Multiplanar, Virtual Organ Computer-Aided Analysis (VOCAL), and Extended Imaging VOCAL Methods

Prognostic Role of Tumor-Head Volume Ratio in Fetal Sacrococcygeal Teratoma

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