Four‐Dimensional Ultrasonography for Dynamic Bladder Shape Visualization and Analysis During Voiding

Hirahara, Naoki; Ukimura, Osamu; Ushijima, So; Yamada, Yoshihiko; Okihara, Koji; Kawauchi, Akihiro; Miki, Tsuneharu

doi:10.7863/jum.2006.25.3.307

Cited by 17 publications

(14 citation statements)

References 13 publications

(32 reference statements)

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“…Hirahara et al (2006) recorded axial, coronal, and sagittal diameters of 15 healthy male adult volunteers voiding using 4D Ultrasound. We use a similar method of determining bladder volumes as Krewer et al (2017) employed in microwave imaging of the bladder, i.e., by fitting a regression line to selected data from the study of Hirahara et al (2006). In this study, however, we use the minimum and maximum data points of the 15 healthy volunteers at each recording instance, rather than using the data from just one patient.…”

Section: Design Of the Bladder Phantomsmentioning

confidence: 99%

A realistic pelvic phantom for electrical impedance measurement

et al. 2018

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A conductively and anatomically accurate pelvic phantom was developed for non-invasive bladder volume monitoring using electrical impedance measurements. Several bladders were designed to correlate with actual human bladder volumes, allowing for accurate volume estimation. The conductivity of the phantom is accurate over 50-250 kHz. This phantom can allow changeable electrode location, contact and size; multi-layer electrodes configurations; increased complexity by addition of other organ or bone phantoms; and electrode movement and deformation. Overall, the pelvic phantom enables greater scope for experimentation and system refinement as a precursor to in-man clinical studies.

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Section: Design Of the Bladder Phantomsmentioning

confidence: 99%

A realistic pelvic phantom for electrical impedance measurement

et al. 2018

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“…In human urinary bladders, impaired contraction of the base might indicate outlet obstruction (Hirahara et al, 2006).…”

Section: The Functional Relevance Of the Nicotinic-purinergic Cross-imentioning

confidence: 99%

A possible role of the cholinergic and purinergic receptor interaction in the regulation of the rat urinary bladder function

Jenes

Ruzsnavszky

Telek

et al. 2012

J Muscle Res Cell Motil

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“…In VUR, the reflux would be observable at the time of, and during, voiding. The controlled time allowed us to be consistent across all animals as in bladder capacity and voiding times vary inter-individual [28]. Despite this limitation in terms of the realistic-ness of the timing of VUR, it must be noted that the timing does not affect the detection capability.…”

Section: Study Limitationsmentioning

confidence: 99%

Detection of Vesicoureteral Reflux Using Electrical Impedance Tomography

Dunne

O’Halloran

Craven

et al. 2019

IEEE Trans. Biomed. Eng.

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The purpose of this study is to detect vesicoureteral reflux (VUR) non-invasively using electrical impedance tomography (EIT). VUR is characterized by the backflow of urine from the bladder to the kidneys. Methods: Using porcine models, small quantities of a solution mimicking the electrical properties of urine were infused into each ureter. EIT measurements were taken before, during and after the infusion using electrodes positioned around the abdomen. The collected data from 116 experiments were then processed and time-difference images reconstructed. Objective VUR detection was determined through statistical analysis of the mean change in the voltage signals and EIT image pixel intensities. Results: Unilateral VUR was successfully detected in 94.83% of all mean voltage signals and in over 98.28% of the reconstructed images. The images showed strong visual contrast between the region of interest and the background. Conclusion: In animal models, EIT has the capability to detect reflux in the kidneys with high accuracy. The results show promise for EIT to be used for screening of VUR in children. Significance: VUR is the most common congenital urinary tract abnormality in children. The condition predisposes children to urinary tract infections (UTIs) and kidney damage. The current gold standard diagnostic test, a voiding cystourethrogram (VCUG), is invasive and uses ionizing radiation; therefore, there is a need for new tools for identifying VUR in children. This study presents a non-invasive method to detect VUR in animal models, illustrating the potential for EIT as a screening tool in clinical scenarios.

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Four‐Dimensional Ultrasonography for Dynamic Bladder Shape Visualization and Analysis During Voiding

Cited by 17 publications

References 13 publications

A realistic pelvic phantom for electrical impedance measurement

A realistic pelvic phantom for electrical impedance measurement

A possible role of the cholinergic and purinergic receptor interaction in the regulation of the rat urinary bladder function

Detection of Vesicoureteral Reflux Using Electrical Impedance Tomography

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