Sonographic Measurement of Cervical Volume in Pregnant Women at High Risk of Preterm Birth Using a Geometric Formula for a Frustum Versus 3‐Dimensional Automated Virtual Organ Computer‐Aided Analysis

Ahmed, Ahmed I.; Aldhaheri, Sarah; Rodriguez‐Kovacs, Javier; Narasimhulu, Deepa Maheswari; Putra, Manesha; Minkoff, Howard; Haberman, Shoshana

doi:10.1002/jum.14253

Cited by 7 publications

(12 citation statements)

References 41 publications

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“…In contrast to the study by Ahmed et al [20], we found a correlation between the length of the cervix measured by 2D transvaginal ultrasound and the volume of the cervix measured by VOCAL. Changes in the length or diameter of the cervix may affect the volume measurements in different proportions, possibly because the irregular shape of the cervix has an effect.…”

Section: Discussioncontrasting

confidence: 99%

“…To limit bias, we did not include any subjective tissue loss assessed by the colposcopist in the total volume of the cone. The main technical challenge with 3D volume postprocessing was indistinct demarcation lines, especially those between the upper cervix and the lower uterine segment [20]. The resulting inclusion of non-cervical tissue, such as the lower uterine segment or vaginal wall, inside the lines may have had the consequence of inaccurate volumes and explain the relative overestimation of cervix volume by VOCAL.…”

Section: Discussionmentioning

confidence: 99%

“…We measured the length of the cervix in the sagittal plane as the straight distance between the internal and external os. Cervical volume was measured using a three-dimensional and automated technique, virtual organ computer-aided analysis (VOCAL; 3D View, version 2.0, GE Healthcare, Milwaukee, WI), which was preferred over the cylinder geometric formula for volume determination because of its comparable accuracy [19] and the fact that only one investigator (A.D.) examined all cases [20]. VOCAL is a software application in which semiautomatic volume calculations are performed via fixed axis rotation through a number of sequential steps [21].…”

Section: Methodsmentioning

confidence: 99%

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3D ultrasound as a surgical quality control of conization in patients with severe dysplasia: a prospective study

Dückelmann

Wordell²,

Richter

et al. 2020

Arch Gynecol Obstet

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Purpose To compare the techniques for cone measurement with ultrasound to determine the size of the resected tissue and to evaluate parameters which may be relevant for stratifying women at risk who need surveillance when pregnant. Methods The present study included women with a pathological cervical biopsy. Cervical length and volume were determined by transvaginal ultrasound prior to conization. The pathologist measured the volume of the removed tissue by the fluid displacement technique and using a ruler. A repeat transvaginal ultrasound was performed during a follow-up visit. Factors affecting cone volume as well as the correlation between measurement techniques were analyzed. Results A total of 28 patients underwent cervical excision treatment. The mean cervical volumes measured sonographically before and after the operation were 17.72 ± 7.34 and 13.21 ± 5.43 cm3, respectively. The proportion of volume excised was 25.50 ± 17.43%. A significant correlation was found between the cone depth and the cone volume measured by the fluid displacement technique, and histopathologically and sonographically measured difference in cervical volume. The interobserver reliability coefficient was > 0.9. Analyzing influential parameters, only age affected the extent of cone volume and the correlation between the three measurement techniques. Conclusion Commonly applied techniques of cervical and cone measurement are equivalent and interchangeable. Our ultrasound data show variety in the volume and length of the cervix, and in the proportion of the volume excised at conization. Ultrasound measurements may help the surgeon to estimate not only the dimension of the remaining cervix but also its function.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

3D ultrasound as a surgical quality control of conization in patients with severe dysplasia: a prospective study

Dückelmann

Wordell²,

Richter

et al. 2020

Arch Gynecol Obstet

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“…More recently, graph matching has been subsumed by hypergraph matching using higher-order constraints [12,19]. An important appeal of higher-order matching methods is their ability to coherently match compact local geometric features from the source space to similar compact regions in the target space, 1 assignment and matching are used interchangeably in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Such images are not limited to merely spherical ones, but also arise in more general warped images due to projection. For instance, 3D sonograms depict the cervix as a conic frustum (truncated cone) [1] and clustered nanofluid microflow patterns in elastic micro-tubes are tracked via matching between cylindrical images in a time-lapse [34].…”

Section: Introductionmentioning

confidence: 99%

Simplicial Complex based Point Correspondence between Images warped onto Manifolds

Sharma¹,

Kaul²

2020

Preprint

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Recent increase in the availability of warped images projected onto a manifold (e.g., omnidirectional spherical images), coupled with the success of higher-order assignment methods, has sparked an interest in the search for improved higher-order matching algorithms on warped images due to projection. Although currently, several existing methods "flatten" such 3D images to use planar graph / hypergraph matching methods, they still suffer from severe distortions and other undesired artifacts, which result in inaccurate matching. Alternatively, current planar methods cannot be trivially extended to effectively match points on images warped onto manifolds. Hence, matching on these warped images persists as a formidable challenge. In this paper, we pose the assignment problem as finding a bijective map between two graph induced simplicial complexes, which are higherorder analogues of graphs. We propose a constrained quadratic assignment problem (QAP) that matches each p-skeleton of the simplicial complexes, iterating from the highest to the lowest dimension. The accuracy and robustness of our approach are illustrated on both synthetic and real-world spherical / warped (projected) images with known ground-truth correspondences. We significantly outperform existing state-of-the-art spherical matching methods on a diverse set of datasets.

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Three‐Dimensional Volume Ultrasound Assessment of Cesarean Scar Niche and Cervix in Pregnant Women

Ivan,

Mahdy,

Banerjee

et al. 2024

J of Ultrasound Medicine

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ObjectiveTo assess the reproducibility of standardized 3‐dimensional (3D) ultrasound volume analysis of the dimensions and the position of cesarean birth (CB) scar niche relative to the cervix in pregnant women.MethodsThis prospective single‐center study in women with 1 previous CB ≥8 cm cervical dilatation acquired ultrasound volumes between 11 and 24 weeks' gestation in a mid‐sagittal plane. Two experienced operators processed the volumes using virtual organ computer‐aided analysis. A CB scar niche was defined as an indentation at the scar site of ≥2 mm in depth. Niche and cervix volumes were calculated using manual contouring. Agreement for categorical variables was expressed using intraclass correlation coefficient (ICC). The Bland–Altman method was used to assess numerical variable reproducibility.ResultsTo achieve the desired statistical power, 52 participants were included. The intraobserver agreement on niche classification relative to the internal os was 100%, with an interobserver kappa coefficient of 0.98 (95% confidence interval [CI] 0.97–0.99, P < .05).The intraobserver ICC for niche volume was 0.94 (95% CI 0.90–0.96; P < .001), with a mean difference of −15.32 mm3 (±109.32). The interobserver ICC was 0.78 (95% CI 0.62–0.87; P < .001), with a mean difference of −21.57 mm3 (±202.01). The ICC for niche/cervix volume ratio were 0.94 (95% CI 0.90–0.96; P < .001) and 0.79 (95% CI 0.63–0.87; P < .001) for intra‐ and interobserver reproducibility, respectively.ConclusionsThis study demonstrates that 3D CB scar sonographic features are highly reproducible in pregnant women with a history of advanced labor CB. The validated protocol can guide future research on the association with subsequent adverse pregnancy outcomes.

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Sonographic Measurement of Cervical Volume in Pregnant Women at High Risk of Preterm Birth Using a Geometric Formula for a Frustum Versus 3‐Dimensional Automated Virtual Organ Computer‐Aided Analysis

Abstract: The cervix represents a frustum (truncated cone, r1 is not equal to r2) in shape rather than a cylinder. Both methods are reproducible; VOCAL is less reliable but provides higher values of cervical volume.

Cited by 7 publications

References 41 publications

3D ultrasound as a surgical quality control of conization in patients with severe dysplasia: a prospective study

3D ultrasound as a surgical quality control of conization in patients with severe dysplasia: a prospective study

Simplicial Complex based Point Correspondence between Images warped onto Manifolds

Three‐Dimensional Volume Ultrasound Assessment of Cesarean Scar Niche and Cervix in Pregnant Women

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