Intra-observer repeatability when assessing the foetal urinary bladder volume by the Virtual Organ Computer-aided AnaLysis and SUM-OF-CYLINDERS methods: A pilot study

Fägerquist, Mats; Sethi, Vivek; Skytteren, Eli; Odén, Anders

doi:10.1177/1742271x17709854

Cited by 3 publications

(6 citation statements)

References 29 publications

(35 reference statements)

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“…Three‐dimensional ultrasound VOCAL technology is a commonly used volume calculation tool 16–18 . This technology adopts the principle of calculus, divides tissues and organs into several volume modules according to the rotation angle, and uses a specific volume calculation formula to automatically measure the sum of the volumes of each module 19 .…”

Section: Commentmentioning

confidence: 99%

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Three‐dimensional ultrasound virtual organ computer‐aided analysis to monitor fetal intracranial volume development characteristics: A multi‐center study in a Chinese population

Shu²,

Lan

et al. 2022

J of Clinical Ultrasound

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Objectives This study aimed to evaluate the feasibility of monitoring fetal intracranial volume using three‐dimensional ultrasound virtual organ computer‐aided analysis (VOCAL) technology and to analyze normal fetal brain growth. Methods This multi‐center prospective cross‐sectional study included 821 pregnant women (18–40 gestational weeks) divided into 23 groups according to gestational week. We used transabdominal three‐dimensional ultrasound VOCAL to monitor fetal intracranial volume; explore the correlation between intracranial volume and gestational age, biparietal diameter (BPD), and head circumference (HC); and analyze the proportion of brain weight to body weight. Results The intracranial volume of normal fetuses conformed to the normal distribution, gradually increased with gestational age, and was highly correlated with gestational age (r = 0.977), BPD (r = 0.975), and HC (r = 0.953; p < 0.001). The median percentage of brain weight (BW) to estimated fetal weight (EFW) was between 13% and 21%, and the BW/EFW ratio showed a significant downward trend in the third trimester. The VOCAL technology monitored the fetal intracranial volume with good repeatability. Conclusions VOCAL technology is feasible for monitoring the fetal intracranial volume, and the intracranial volume increases more than 10‐times in the second and third trimesters.

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Section: Commentmentioning

confidence: 99%

“…Three-dimensional ultrasound VOCAL technology is a commonly used volume calculation tool. [16][17][18] formula to automatically measure the sum of the volumes of each module. 19 It can outline the structure around the specified axis, and each rotation delineates an area.…”

Section: Commentmentioning

confidence: 99%

Three‐dimensional ultrasound virtual organ computer‐aided analysis to monitor fetal intracranial volume development characteristics: A multi‐center study in a Chinese population

Shu²,

Lan

et al. 2022

J of Clinical Ultrasound

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“…To solve this equation system unit quaternions were used to compute the rotation component in closed form. Four different metrics were tested for this task: Horaud [28], Tsai [23], Park [25] and Liang [26]. The same phantom US images used for the Multi-point calibration were also used for the Hand-eye calibration procedure.…”

Section: Plos Onementioning

confidence: 99%

“…The 3D images of the egg acquired with the 3D wobbler mode and the 3D free-hand mode were segmented with control points: for all three projections, the observer moved a loop of interconnected points (around thirty per projection) on the contour of the surface. The final volume was calculated by least square sphere fitting on 3D Slicer (Fig 7), similar to Fagerquist et al and Uittenbogarrd et al [28,29] Three different depths were investigated. This was done by increasing the distance between the bottom surface of the egg phantom and the transducer.…”

Section: Volume Error Analysismentioning

confidence: 99%

Evaluation of 3D ultrasound for image guidance

2020

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In this paper we compared two different 3D ultrasound (US) modes (3D free-hand mode and 3D wobbler mode) to see which is more suitable to perform the 3D-US/3D-US registration for clinical guidance applications. The typical errors with respect to their impact on the final localization error were evaluated step by step. Methods Multi-point target and Hand-eye calibration methods were used for 3D US calibration together with a newly designed multi-cone phantom. Pointer based and image based methods were used for 2D US calibration. The calibration target error was computed by using a different multi-cone phantom. An egg-shaped phantom was used as ground truth to compare distortions for both 3D modes along with the measurements of the volume. Finally, we compared 3D ultrasound images acquired by 3D wobbler mode and 3D free-hand mode with respect to their 3D-US/3D-US registration accuracy using both, phantom and patient data. A theoretical step by step error analysis was performed and compared to empirical data. Results Target registration errors based on the calibration with the 3D Multi-point and 2D pointer/ image method have been found to be comparable (*1mm). They both outperformed the 3D Hand-eye method (error >2mm). Volume measurements with the 3D free-hand mode were closest to the ground truth (around 6% error compared to 9% with the 3D wobbler mode). Additional scans on phantoms showed a 3D-US/3D-US registration error below 1 mm for both, the 3D free-hand mode and the 3D wobbler mode, respectively. Results with patient data showed greater error with the 3D free-hand mode (6.50mm − 13.37mm) than with the 3D wobbler mode (2.99 ± 1.54 mm). All the measured errors were found to be in accordance to their theoretical upper bounds. Conclusion While both 3D volume methods showed comparable results with respect to 3D-US/3D-US registration for phantom images, for patient data registrations the 3D wobbler mode is

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“…Occasionally the position of the fetus makes it difficult for the observer to capture appropriate bladder images [10]. This is probably the reason for why the HFUPR was based on just two bladder volume estimations with 5-10 min intervals in some papers [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Determining the Uncertainty of Fetal Urine Production Rate Estimations

Fägerquist

Carlsson

Imberg

et al. 2021

Journal of Fetal Medicine

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The fetal urinary bladder can be observed by ultrasound and the increasing bladder volume during a filling phase is assumed to reveal the urine production. Volumes, estimated at different time points within the filling phase, allow the hourly fetal urine production rate (HFUPR) to be estimated. HFUPR estimations may add to the knowledge of fetal reactions during obstetrical complications. However, it is essential to know the degree of measurement uncertainty. Otherwise, small deviations may be overrated when repeating HFUPR estimations. The purpose of the current paper was to introduce an interactive program for calculation of HFUPR and the related standard deviation (SD). Furthermore the aim was to evaluate factors which may influence the SD of HFUPR estimations. Using the office software Excel, an interactive program was created and the application was illustrated by the filling phases of 16 fetuses. This material also enabled different realistic sets of estimation data to be simulated. Thus, SDs were calculated based on various numbers of documented bladder images and investigation times. When three instead of two bladder images were used for HFUPR estimation, the mean of SD was reduced from 22.4 to 8.1 mL/h (p \ 0.0001). When the time from the first to the last measurement expanded from 10 to 30 min and four bladder images were used, the mean of SD was reduced from 7.5 to 2.4 mL/h. (p \ 0.0001). An interactive program for calculation of HFUPR and the related SD was provided. Reductions in the SD with increasing number of bladder measurements and time span between measurements were demonstrated.

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Intra-observer repeatability when assessing the foetal urinary bladder volume by the Virtual Organ Computer-aided AnaLysis and SUM-OF-CYLINDERS methods: A pilot study

Cited by 3 publications

References 29 publications

Three‐dimensional ultrasound virtual organ computer‐aided analysis to monitor fetal intracranial volume development characteristics: A multi‐center study in a Chinese population

Three‐dimensional ultrasound virtual organ computer‐aided analysis to monitor fetal intracranial volume development characteristics: A multi‐center study in a Chinese population

Evaluation of 3D ultrasound for image guidance

Determining the Uncertainty of Fetal Urine Production Rate Estimations

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