Predictive model of the prostate motion in the context of radiotherapy: A biomechanical approach relying on urodynamic data and mechanical testing

Boubaker, Mohamed Bader; Haboussi, Mohamed; Ganghoffer, Jean‐François; Aletti, P.

doi:10.1016/j.jmbbm.2015.04.016

Cited by 12 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Boubaker et al (Boubaker, Haboussi et al 2015) applied a hyperelastic material deformation model developed by Ogden (Ogden 1984) to the bladder using the following equation for the relationship between uniaxial stress, σ 1 , and strain, λ 1 :

{normalσ}_{1} = a ({λ_{1}}^{(b - 1)} - {λ_{1}}^{(- \frac{b}{2}) - 1})

…”

Section: Theory and Methodsmentioning

confidence: 99%

Modeling the influence of acute changes in bladder elasticity on pressure and wall tension during filling

Habteyes

Komari

Nagle

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

Tension-sensitive nerves in the bladder wall are responsible for providing bladder sensation. Bladder wall tension, and therefore nerve output, is a function of bladder pressure, volume, geometry and material properties. The elastic modulus of the bladder is acutely adjustable, and this material property is responsible for adjustable preload tension exhibited in human and rabbit detrusor muscle strips and dynamic elasticity revealed during comparative-fill urodynamics in humans. A finite deformation model of the bladder was previously used to predict filling pressure and wall tension using uniaxial tension test data and the results showed that wall tension can increase significantly during filling with relatively little pressure change. In the present study, published uniaxial rabbit detrusor data were used to quantify regulated changes in the elastic modulus, and the finite deformation model was expanded to illustrate the potential effects of elasticity changes on pressure and wall tension during filling. The model demonstrates a shift between relatively flat pressure-volume filling curves, which is consistent with a recent human urodynamics study, and also predicts that dynamic elasticity would produce significant changes in wall tension during filling. The model results support the conclusion that acute regulation of bladder elasticity could contribute to significant changes in wall tension for a given volume that could lead to urgency, and that a single urodynamic fill may be insufficient to characterize bladder biomechanics. The model illustrates the potential value of quantifying wall tension in addition to pressure during urodynamics.

show abstract

{normalσ}_{1} = a ({λ_{1}}^{(b - 1)} - {λ_{1}}^{(- \frac{b}{2}) - 1})

…”

Section: Theory and Methodsmentioning

confidence: 99%

Modeling the influence of acute changes in bladder elasticity on pressure and wall tension during filling

Habteyes

Komari

Nagle

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

show abstract

“…[13][14][15] Although the bladder has historically been modeled as a sphere or spheroid, 6,16,17 imaging has shown that bladder shape is variable and irregular. 6,11,[18][19][20][21] Analytical biomechanical analysis, 5,6 statistical shape modeling, 11 and finite element modeling 20,21 all demonstrate that nonspherical bladder shape changes during filling significantly affect its mechanical behavior inside the body.…”

Section: Discussionmentioning

confidence: 99%

Use of Ultrasound Urodynamics to Identify Differences in Bladder Shape Between Individuals With and Without Overactive Bladder

As²,

Bernardo³

et al. 2018

Female Pelvic Med Reconstr Surg

View full text Add to dashboard Cite

Objectives: The objective of this study was to identify differences in bladder shape changes between individuals with overactive bladder (OAB) and unaffected individuals during ultrasound urodynamics.Methods: A prospective urodynamic study was performed with concurrent transabdominal ultrasound (ultrasound urodynamics) on individuals with and without OAB based on validated International Consultation on Incontinence Questionnaire -OAB survey scores. Three-dimensional ultrasound images were acquired at 1-minute increments during filling and used to measure bladder diameters in the height, width, and depth orientations. The engineering strain for each diameter was compared between participants with OAB and controls during urodynamic filling. The height-to-width ratio at capacity was used to determine if individuals were shape outliers.Results: A total of 22 subjects were enrolled, including 11 with OAB and 11 without OAB. During urodynamic filling in both groups, the greatest degree of geometric strain was found in the height orientation, indicating that bladders generally fill in a craniocaudal shape. The mean ± SD

show abstract

“…The constants c ij are the material parameters (with c 00 = 0) with unit of pressure. In the particular case where only c 10 is non-zero, the strain energy function is designated as the Besides invariant-based models, Ogden's model [65], which depends on the principal stretches λ i with i = r, θ, z (λ 2 i = eigen(C)), has been used in various studies [66][67][68][69] as listed in Table S3. The general form of the Ogden's model is expressed as follows…”

Section: Phenomenological Modelsmentioning

confidence: 99%

Biomechanical Constitutive Modeling of the Gastrointestinal Tissues: Where Are We?

Patel¹,

Gizzi²,

Hashemi³

et al. 2021

Preprint

View full text Add to dashboard Cite

The gastrointestinal (GI) tract is a continuous channel through the body that consists of the esophagus, the stomach, the small intestine, the large intestine, and the rectum. Its primary functions are to move the intake of food for digestion before storing and ultimately expulsion of feces from the rectum through the anal sphincter. The mechanical behavior of GI tissues thus plays a crucial role for GI function in health and disease. The mechanical properties are typically characterized by a constitutive biomechanical model, which is a mathematical representation of the relation between load and deformation in a tissue. Hence, validated biomechanical constitutive models are essential to characterize and simulate the mechanical behavior of the GI tract under physiological and pathological conditions. Numerous constitutive models have consequently been proposed over the past three decades, mainly inspired by work done in cardiovascular tissues. Here, a comprehensive review of these constitutive models is provided. This review is limited to studies where a model of the strain energy function is proposed to characterize the stress-strain relation of a GI tissue. Several needs are identified for more advanced modeling of GI biomechanics including: 1) Microstructural models that provide actual structure-function relations; 2) Validation of coupled electro-mechanical models accounting for active muscle contractions; 3) Human data under physiological and pathological conditions to develop and validate models. The findings from this review provide guidelines for using existing constitutive models as well as perspective and directions for future studies aimed at establishing new constitutive models for GI tissues.

show abstract

Predictive model of the prostate motion in the context of radiotherapy: A biomechanical approach relying on urodynamic data and mechanical testing

Cited by 12 publications

References 24 publications

Modeling the influence of acute changes in bladder elasticity on pressure and wall tension during filling

Modeling the influence of acute changes in bladder elasticity on pressure and wall tension during filling

Use of Ultrasound Urodynamics to Identify Differences in Bladder Shape Between Individuals With and Without Overactive Bladder

Biomechanical Constitutive Modeling of the Gastrointestinal Tissues: Where Are We?

Contact Info

Product

Resources

About