Objective: Ultrasound backscattered signals encompass information on the microstructure of heterogeneous media such as cortical bone, in which pores act as scatterers and result in the scattering and multiple scattering of ultrasound waves. The objective of this study was to investigate whether Shannon entropy can be exploited to characterize cortical porosity.
Methods: In the study described here, to demonstrate proof of concept, Shannon entropy was used as a quantitative ultrasound parameter to experimentally evaluate microstructural changes in samples with controlled scatterer concentrations made of a highly absorbing polydimethylsiloxane matrix (PDMS). Similar assessment was then performed using numerical simulations on cortical bone structures with varying average pore diameter (Ct.Po.Dm.), density (Ct.Po.Dn.) and porosity (Ct.Po.).
Results: The results suggest that an increase in pore diameter and porosity lead to an increase in entropy, indicating increased levels of randomness in the signals as a result of increased scattering. The entropy-versus-scatterer volume fraction in PDMS samples indicates an initial increasing trend that slows down as the scatterer concentration increases. High levels of attenuation cause the signal amplitudes and corresponding entropy values to decrease drastically. The same trend is observed when porosity of the bone samples is increased above 15%.
Conclusion: Sensitivity of entropy to microstructural changes in highly scattering and absorbing media can potentially be exploited to diagnose and monitor osteoporosis.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultrasmedbio.2023.04.006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Crane Technique in Cortical Bone Trajectory Screw Lumbar Fusion: Efficacy and Predictors of Spondylolisthesis Reduction.
World Neurosurg
January 2025
Advanced AI Minimally Invasive Spine Center, China Medical University Hsinchu Hospital, Hsinchu, Taiwan; Department of Neurosurgery, China Medical University Hsinchu Hospital, Hsinchu, Taiwan. Electronic address:
Objectives: To evaluate the efficacy of the Crane reduction technique in midline lumbar fusion (MIDLF) with cortical bone trajectory screws for treating degenerative spondylolisthesis, and to identify factors affecting the reduction rate.
Methods: A retrospective analysis was conducted on 87 patients (64 female and 23 male) with L4-5 degenerative spondylolisthesis who underwent MIDLF and the Crane technique. Patients were categorizing using the spondylolisthesis Meyerding classification system into Grade I (59 patients) and Grade II (28 patients) groups and compared for demographics, radiographic parameters, and the spondylolisthesis reduction rate.
A data-driven framework for developing a unified density-modulus relationship for the human lumbar vertebral body.
J Mech Behav Biomed Mater
January 2025
Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA; Center for Multiscale and Translational Mechanobiology, Boston University, Boston, MA 02215, USA; Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA.
Despite the broad agreement that bone stiffness is heavily dependent on the underlying bone density, there is no consensus on a unified relationship that applies to both cancellous and cortical compartments. Bone from the two compartments is generally assessed separately, and few mechanical test data are available for samples from the transitional regions between them. In this study, we present a data-driven framework integrating experimental testing and numerical modeling of the human lumbar vertebra through an energy balance criterion, to develop a unified density-modulus relationship across the entire vertebral body, without the necessity of differentiation between trabecular and cortical regions.
View Article and Find Full Text PDFFracture characteristics of human cortical bone influenced by the duration of glycation.
JBMR Plus
February 2025
Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany.
Advanced glycation end products (AGEs) accumulate in various tissues, including bone, due to aging and conditions like diabetes mellitus. To investigate the effects of AGEs on bone material quality and biomechanical properties, an study utilizing human tibial cortex, sectioned into 90 beams, and randomly assigned to three mechanical test groups was performed. Each test group included ribose ( = 0.
View Article and Find Full Text PDFImprovement of bone properties in children with osteogenesis imperfecta after pamidronate: a bone biopsy study.
JBMR Plus
February 2025
INSERM UMR 1033, Univ Lyon, Université Claude Bernard Lyon 1, F-69008 Lyon, France.
OI, or bone brittle disease, is characterized by increased mineralization of bone matrix independently of clinical severity. So, a beneficial effect of antiresorptive treatments such as bisphosphonates (BP) is questionable. We aim to compare the bone matrix characteristics before and after BP pamidronate (PAM).
View Article and Find Full Text PDFProtective effects of Lactobacillus plantarum strain against protein malnutrition-induced muscle atrophy and bone loss in juvenile mice.
PLoS One
January 2025
School of Biological Sciences, Seoul National University, Seoul, South Korea.
Early-life malnutrition adversely affects nearly all organ systems, resulting in multiple physiological adaptations, including growth restriction and muscle and bone loss. Although there is growing evidence that probiotics effectively improve systemic growth under malnourished conditions in different animal models, our knowledge of the beneficial effects of probiotics on various organs is limited. Here, we show that Lactobacillus plantarum strain WJL (LpWJL) can mitigate skeletal muscle and bone loss in protein-malnourished juvenile mice.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!