Effects of bladder shape on accuracy of measurement of bladder volume using portable ultrasound scanner and development of correction method

Zhao, Lin; Liu, Limin; Gao, Lijuan; Gao, Yi; Cong, Huiling; Wang, Yiming; Liao, Xiwen

doi:10.1002/nau.23883

Cited by 5 publications

(5 citation statements)

References 18 publications

(49 reference statements)

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“…During the completion of two complete fill–void cycles, ultrasound images and BladderScan volumes were recorded at 5‐minute intervals through all fills. Volumes were determined by taking the average of three BladderScan values to ensure precision and accuracy . To determine the effects of ultrasound probe pressure on bladder sensation, data from Visit B (post‐trained, with ultrasound) were compared to Visit C (post‐trained, without ultrasound).…”

Section: Methodsmentioning

confidence: 99%

Validation of a real‐time bladder sensation meter during oral hydration in healthy adults: Repeatability and effects of fill rate and ultrasound probe pressure

Sheen

Kolli

Nagle

et al. 2019

LUTS

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Objectives A non‐invasive protocol was previously developed using three‐dimensional ultrasound and a sensation meter to characterize real‐time bladder sensation. This study the protocol by measuring the effects of fill rateand ultrasound probe pressure during oral hydration. Methods Healthy volunteers with no urinary symptoms (based on International Consultation on Incontinence Questionnaire on Overactive Bladder surveys) were recruited into an oral hydration study. Throughout two complete fill–void cycles, participants drank 2 L Gatorade G2 (The Gatorade Company, Inc., Chicago, Illinois) and used a touch‐screen sensation meter to record real‐time bladder sensation (0%‐100%). The study was repeated three times, once per week (Visits A, B, and C). In Visits A and B, ultrasound was used to measure bladder volume every 5 minutes. Ultrasound was not used in Visit C except at 100% capacity. Volume data from Visit B were used to estimate volumes throughout the fills in Visit C. Sensation–capacity curves were generated for each fill for comparative analysis. Results Ten participants completed three visits (60 total fills). Increased fill rate led to decreased sensation throughout filling, andultrasound probe pressure led to increased sensation. Participants reported higher sensation at low volumes during Fill 1 of Visit A before training with the sensation meter. Sensation curves with intermittent ultrasound showed repeatability for Fill 2 in Visits A and B. Fill rate and ultrasound probe pressure affect real‐time bladder sensation during oral hydration. Conclusions This study demonstrated repeatability of real‐time bladder sensation during a two‐fill oral hydration protocol with ultrasound.

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Section: Methodsmentioning

confidence: 99%

Validation of a real‐time bladder sensation meter during oral hydration in healthy adults: Repeatability and effects of fill rate and ultrasound probe pressure

Sheen

Kolli

Nagle

et al. 2019

LUTS

View full text Add to dashboard Cite

show abstract

“…However, the bladder is not exactly a spherical shape. Also, previous studies demonstrated that the shape of the bladder could affect the accuracy of BS [9,30]. Thus, the bias inherent to irregular shape could be maximized when the bladder reaches fullness.…”

Section: Discussionmentioning

confidence: 99%

Can portable ultrasound bladder scanner be applied to young children less than three years old?

Kim

et al. 2022

Journal of Pediatric Urology

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“…It is related to the specific patient and the filling degree of his or her bladder. Zhao et al 24 investigated the effects of bladder shape on the accuracy of measurement of bladder volume, and the results showed that bladder shape plays a critical role. Thus, the different correction coefficients were usually used for cuboidal, ellipsoidal, and triangular prismatic shapes of the bladder.…”

Section: Costeffectivenessmentioning

confidence: 99%

“…It is related to the specific patient and the filling degree of his or her bladder. Zhao et al 24 . investigated the effects of bladder shape on the accuracy of measurement of bladder volume, and the results showed that bladder shape plays a critical role.…”

Section: Introductionmentioning

confidence: 99%

Weakly supervised learning‐based 3D bladder reconstruction from 2D ultrasound images for bladder volume measurement

et al. 2023

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BackgroundAccurate measurement of bladder volume is necessary to maintain the consistency of the patient's anatomy in radiation therapy for pelvic tumors. As the diversity of the bladder shape, traditional methods for bladder volume measurement from 2D ultrasound have been found to produce inaccurate results.PurposeTo improve the accuracy of bladder volume measurement from 2D ultrasound images for patients with pelvic tumors.MethodsThe bladder ultrasound images from 130 patients with pelvic cancer were collected retrospectively. All data were split into a training set (80 patients), a validation set (20 patients), and a test set (30 patients). A total of 12 transabdominal ultrasound images for one patient were captured by automatically rotating the ultrasonic probe with an angle step of 15°. An incomplete 3D ultrasound volume was synthesized by arranging these 2D ultrasound images in 3D space according to the acquisition angles. With this as input, a weakly supervised learning‐based 3D bladder reconstruction neural network model was built to predict the complete 3D bladder. The key point is that we designed a novel loss function, including the supervised loss of bladder segmentation in the ultrasound images at known angles and the compactness loss of the 3D bladder. Bladder volume was calculated by counting the number of voxels belonging to the 3D bladder. The dice similarity coefficient (DSC) was used to evaluate the accuracy of bladder segmentation, and the relative standard deviation (RSD) was used to evaluate the calculation accuracy of bladder volume with that of computed tomography (CT) images as the gold standard.ResultsThe results showed that the mean DSC was up to 0.94 and the mean absolute RSD can be reduced to 6.3% when using 12 ultrasound images of one patient. Further, the mean DSC also was up to 0.90 and the mean absolute RSD can be reduced to 9.0% even if only two ultrasound images were used (i.e., the angle step is 90°). Compared with the commercial algorithm in bladder scanners, which has a mean absolute RSD of 13.6%, our proposed method showed a considerably huge improvement.ConclusionsThe proposed weakly supervised learning‐based 3D bladder reconstruction method can greatly improve the accuracy of bladder volume measurement. It has great potential to be used in bladder volume measurement devices in the future.

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Effects of bladder shape on accuracy of measurement of bladder volume using portable ultrasound scanner and development of correction method

Cited by 5 publications

References 18 publications

Validation of a real‐time bladder sensation meter during oral hydration in healthy adults: Repeatability and effects of fill rate and ultrasound probe pressure

Validation of a real‐time bladder sensation meter during oral hydration in healthy adults: Repeatability and effects of fill rate and ultrasound probe pressure

Can portable ultrasound bladder scanner be applied to young children less than three years old?

Weakly supervised learning‐based 3D bladder reconstruction from 2D ultrasound images for bladder volume measurement

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