A Xue, R Hanly, D Luichareonkit, S Thomas, T Barber, A W Welsh
{"title":"Automated multivolume placental reconstruction using three-dimensional power Doppler ultrasound and infrared camera tracking.","authors":"A Xue, R Hanly, D Luichareonkit, S Thomas, T Barber, A W Welsh","doi":"10.1002/uog.27708","DOIUrl":"10.1002/uog.27708","url":null,"abstract":"<p><strong>Objectives: </strong>Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three-dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial location of the transducer providing global coordinates. These volumes are reconstructed automatically ('stitched') into a model of the entire placenta. The purpose of this study was to evaluate the accuracy of automated reconstruction in an US phantom and to assess the feasibility of this technique in second-to-third-trimester human placentae.</p><p><strong>Methods: </strong>A custom-designed acrylic phantom was constructed with dimensions mimicking a third-trimester placenta, containing 12 rectangular cuboid towers of various heights submersed in tissue-mimicking solution. Multiple overlapping 3D-US volumes of this phantom were acquired using three different insonation angles and infrared camera tracking. Data were transformed into a 3D cartesian volume and stitched automatically into six 3D-US volumes, each covering the entire phantom, for each of the three different insonation angles. Reconstruction accuracy was evaluated by calculating local distance error (assessment of towers in overlapping US volumes to determine accuracy of stitching) and global distance error (subtraction of true measurements in phantom model from corresponding measurements in stitched 3D-US volumes). A single-center, cross-sectional feasibility study was then conducted in women with an uncomplicated second-to-third-trimester singleton pregnancy, with data obtained using standardized ultrasound settings. Multiple 3D PD-US and grayscale volumes of the placentae were acquired with infrared camera-tracked coordinates. Volumes were stitched to create a model of placental vasculature, and these were assessed for quality and repeatability of volume measurement.</p><p><strong>Results: </strong>Six entire phantom datasets were reconstructed at each of three insonation angles, giving a total of 18 extended phanom datasets. A median of nine 3D-US volumes required to reconstruct the entire phantom. Twelve towers per volume were assessed on three separate occasions, generating 648 datapoints. Of these datapoints, 67.1% were perfectly aligned. The mean local distance error was 2.92 (range, 0-25.51) mm. Measurements between towers of 120 distances in each stitched 3D-US volume (2160 distances in total) differed by an average of 1.51 (range, -4.78 to 4.23) mm from the true measurements in the phantom model. In the feasibility study, 17 participants were scanned, and 49 3D-US volume datasets acquired, with 92% reconstruction success per placental volume set and at least one complete volume being obtained per participant (100% participant achievability). The median volume acquisition and reconstruction time was 10 min. Reconstructe","PeriodicalId":23454,"journal":{"name":"Ultrasound in Obstetrics & Gynecology","volume":" ","pages":"624-632"},"PeriodicalIF":6.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12047681/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141094345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D Fischerova, P Pinto, M Pesta, M Blasko, M C Moruzzi, A C Testa, D Franchi, V Chiappa, J L Alcázar, M Wiesnerova, D Cibula, L Valentin
{"title":"Ultrasound examiners' ability to describe ovarian cancer spread using preacquired ultrasound videoclips from a selected patient sample with high prevalence of cancer spread.","authors":"D Fischerova, P Pinto, M Pesta, M Blasko, M C Moruzzi, A C Testa, D Franchi, V Chiappa, J L Alcázar, M Wiesnerova, D Cibula, L Valentin","doi":"10.1002/uog.29208","DOIUrl":"10.1002/uog.29208","url":null,"abstract":"<p><strong>Objectives: </strong>To assess the ability, as well as factors affecting the ability, of ultrasound examiners with different levels of ultrasound experience to detect correctly infiltration of ovarian cancer in predefined anatomical locations, and to evaluate the inter-rater agreement regarding the presence or absence of cancer infiltration, using preacquired ultrasound videoclips obtained in a selected patient sample with a high prevalence of cancer spread.</p><p><strong>Methods: </strong>This study forms part of the Imaging Study in Advanced ovArian Cancer multicenter observational study (NCT03808792). Ultrasound videoclips showing assessment of infiltration of ovarian cancer were obtained by the principal investigator (an ultrasound expert, who did not participate in rating) at 19 predefined anatomical sites in the abdomen and pelvis, including five sites that, if infiltrated, would indicate tumor non-resectability. For each site, there were 10 videoclips showing cancer infiltration and 10 showing no cancer infiltration. The reference standard was either findings at surgery with histological confirmation or response to chemotherapy. For statistical analysis, the 19 sites were grouped into four anatomical regions: pelvis, middle abdomen, upper abdomen and lymph nodes. The videoclips were assessed by raters comprising both senior gynecologists (mainly self-trained expert ultrasound examiners who perform preoperative ultrasound assessment of ovarian cancer spread almost daily) and gynecologists who had undergone a minimum of 6 months' supervised training in the preoperative ultrasound assessment of ovarian cancer spread in a gynecological oncology center. The raters were classified as highly experienced or less experienced based on annual individual caseload and the number of years that they had been performing ultrasound evaluation of ovarian cancer spread. Raters were aware that for each site there would be 10 videoclips with and 10 without cancer infiltration. Each rater independently classified every videoclip as showing or not showing cancer infiltration and rated the image quality (on a scale from 0 to 10) and their diagnostic confidence (on a scale from 0 to 10). A generalized linear mixed model with random effects was used to estimate which factors (including level of experience, image quality, diagnostic confidence and anatomical region) affected the likelihood of a correct classification of cancer infiltration. We assessed the observed percentage of videoclips classified correctly, the expected percentage of videoclips classified correctly based on the generalized linear mixed model and inter-rater agreement (reliability) in classifying anatomical sites as being infiltrated by cancer.</p><p><strong>Results: </strong>Twenty-five raters participated in the study, of whom 13 were highly experienced and 12 were less experienced. The observed percentage of correct classification of cancer infiltration ranged from 70% to 100% depen","PeriodicalId":23454,"journal":{"name":"Ultrasound in Obstetrics & Gynecology","volume":"65 5","pages":"641-652"},"PeriodicalIF":6.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12047678/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144016542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M Doglioli, L De Meis, E Mantovani, G Cristani, R Seracchioli, S Del Forno
{"title":"Endometrioma decidualization in pregnancy: not just about papillations.","authors":"M Doglioli, L De Meis, E Mantovani, G Cristani, R Seracchioli, S Del Forno","doi":"10.1002/uog.29203","DOIUrl":"10.1002/uog.29203","url":null,"abstract":"","PeriodicalId":23454,"journal":{"name":"Ultrasound in Obstetrics & Gynecology","volume":" ","pages":"657-658"},"PeriodicalIF":6.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143524251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D A Badr, F Abi-Khalil, C Kadji, N Marroun, A Carlin, M M Cannie, J C Jani
{"title":"Association of magnetic resonance imaging-derived maternal and fetal parameters with shoulder dystocia: matched case-control study.","authors":"D A Badr, F Abi-Khalil, C Kadji, N Marroun, A Carlin, M M Cannie, J C Jani","doi":"10.1002/uog.29210","DOIUrl":"10.1002/uog.29210","url":null,"abstract":"<p><strong>Objective: </strong>To assess the association of fetal body measurements and maternal pelvic measurements obtained using magnetic resonance imaging (MRI) with the incidence of shoulder dystocia.</p><p><strong>Methods: </strong>This was a retrospective, single-center, case-control study conducted between January 2015 and December 2022. Patients whose delivery was complicated by shoulder dystocia and who underwent fetal MRI in the third trimester were included in the case group. Patients without shoulder dystocia who were delivered normally and who also underwent fetal MRI in the third trimester were included in the control group. Cases of multiple pregnancy, planned or emergency Cesarean delivery, fetal malformation or those with incomplete MRI examination were excluded. The case group was matched with the control group in a 1:2 ratio according to maternal age, maternal body mass index, gestational diabetes mellitus, diabetes mellitus Type 1 or 2, gestational age at MRI examination, gestational age at birth and birth weight. Shoulder dystocia was defined as per the Royal College of Obstetricians and Gynecologists and significant shoulder dystocia was defined as shoulder dystocia that was not resolved by the McRoberts' maneuver or suprapubic pressure. The following fetal and maternal measurements were quantified on MRI in both groups by two readers (one experienced and one inexperienced physician) who were blinded to the obstetric outcomes: fetal body volume (FBV), shoulder skin-to-skin distance, interhumeral distance, biparietal diameter (BPD), head circumference, obstetric conjugate (OC), sagittal outlet diameter (SOD), coccygeal pelvic outlet (CPO) and maximal transverse diameter (MTD). A stepwise backward logistic regression that included all measurements was performed. The inter-rater reliability of the measurements was estimated using interclass correlation coefficient (ICC). Statistical significance was set at P < 0.05.</p><p><strong>Results: </strong>Among the 1843 patients included in the study, there were 63 (3.4%) cases of shoulder dystocia. After matching, the case group comprised 36 patients and the control group comprised 72 patients. Patients who had shoulder dystocia, compared to those without, had higher FBV (P = 0.023), higher shoulder skin-to-skin distance (P = 0.003), lower OC (P = 0.021), lower SOD (P = 0.004), lower CPO (P = 0.045) and lower MTD (P = 0.001) in comparison with those without. The logistic regression model showed that FBV, shoulder skin-to-skin distance, BPD, SOD and MTD were independent predictors of shoulder dystocia. The measurements of interest had moderate to excellent reliability when repeated by an inexperienced reader. In those who had non-significant shoulder dystocia, only shoulder skin-to-skin distance was significantly greater and OC was significantly lower in comparison with the control group, whereas in those who had significant shoulder dystocia, only SOD and MTD were significantly lower","PeriodicalId":23454,"journal":{"name":"Ultrasound in Obstetrics & Gynecology","volume":" ","pages":"604-612"},"PeriodicalIF":6.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143731356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}