scholarly journals Reliability of testicular stiffness quantification using shear wave elastography in predicting male fertility: a preliminary prospective study

2018 ◽  
Vol 20 (2) ◽  
pp. 141 ◽  
Author(s):  
Alpaslan Yavuz ◽  
Adem Yokus ◽  
Kerem Taken ◽  
Abdussamet Batur ◽  
Mesut Ozgokce ◽  
...  
Keyword(s):  
Prospective Study ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Sperm Count ◽  
Shear Wave Elastography ◽  
Non Invasive ◽  
Sperm Counts ◽  
Wave Technique ◽  
The Mean

Aims: To evaluate the reliability of testicular stiffness quantification using shear wave elastography in predicting the fertility potential of males and for the pre-diagnosis of disorders based upon sperm quantification. Material and methods: One hundred males between the ages of 19-49 years (mean age of 28.77±6.11), ninety of whom with complaints of infertility, were enrolled in this prospective study. Scrotal grey-scale, Doppler ultrasound (US), and mean testicular shear wave velocity quantifications (SWVQs) were performed. The volumes of testes, as well as the grade of varicocele if present, were recorded. The mean shear wave velocity values (SWVVs) of each testis and a mean testicular SWVV for each patient were calculated. The semen-analyses of patients were consecutively performed. Results: There were significant negative correlations between the mean testicular SWVVs of patients and their sperm counts or the testis volumes (r=-0.399, r=-0.565; p<0.01, respectively). A positive correlation was found between testicular volumes and sperm counts (r=0.491, p<0.01). The cut-off values regarding mean testicular SWVV to distinguish normal sperm count from azoospermia and oligozoospermia were 1.465 m/s (75.0% sensitivity and 75.0% specificity) and 1.328 m/s (64.3% sensitivity and 68.2% specificity), respectively, and the value to distinguish oligozoospermia from azoospermia was 1.528 m/s (66.7% sensitivity, 60.7% specificity). Conclusion: The mean testicular SWVQ using the ARFI shear wave technique was a reliable, non-invasive and acceptably stable method for predicting male infertility, especially related to sperm count issues. 

scholarly journals Reliability of shear wave elastography ultrasound to assess the supraspinatus tendon: An intra and inter-rater in vivo study

2019 ◽  
Vol 12 (1) ◽  
pp. 18-23 ◽  
Author(s):  
Lisa Hackett ◽  
Ricardo Aveledo ◽  
Patrick H Lam ◽  
George AC Murrell
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Acoustic Radiation ◽  
Intraclass Correlation ◽  
Shear Wave Elastography ◽  
Radiation Force ◽  
Supraspinatus Tendon ◽  
Acoustic Radiation Force Impulse ◽  
The Mean

Introduction Shear wave elastography ultrasound is a relatively new technique that evaluates the tissue elasticity by applying an acoustic radiation force impulse. It is undetermined how reliable this modality is in assessing rotator cuff tendons. The aim of this study, therefore, was to evaluate the reliability of shear wave elastography ultrasound to assess the stiffness of normal and tendinopathic supraspinatus tendons. Methods An inter- and intra-rater reliability trial was carried out using shear wave elastography to assess the supraspinatus tendon at its distal insertion, by measuring shear wave velocity and elasticity. Twenty participants with a mean age of 37 (21–69) years old were evaluated. Ten subjects with normal supraspinatus tendon and 10 subjects with tendinopathic tendon were selected. The Virtual Touch Imaging Quantification program was used to generate the acoustic radiation force impulse and to obtain the elastography data. Three raters with different experience in conventional ultrasound were used for the inter-rater trial in normal tendons and the most experienced rater examined all subjects for the intra-rater reliability evaluation. Each rater obtained three readings in three different examinations per subject over a one-week period. Results The mean (±SEM) shear wave velocity for the normal supraspinatus tendon was 9.96 ± 0.02 m/s (=297 kPa), while in the tendinopathic supraspinatus tendon was 8.3 ± 0.2 m/s (=207 kPa) (p < 0.001). The intra-rater trial agreement was excellent, with an intraclass correlation coefficient = 0.96. In the inter-rater testing, the mean shear wave velocity in normal tendons was 9.90 ± 0.07 m/s (=294 kPa), with intraclass correlation coefficient = 0.45. Conclusion Shear wave elastography ultrasound was able to show that tendinopathic tendons were less stiff than normal tendons. It was a reliable imaging technique to assess the supraspinatus tendon, especially when used by a single experienced musculoskeletal sonographer.

scholarly journals Determining the effects of excess weight on renal cortical stiffness in children and adolescents with point Shear Wave Elastography

2021 ◽  
Author(s):  
Zehra Filiz Karaman ◽  
Fatih Kardas
Keyword(s):  
Body Mass Index ◽  
Children And Adolescents ◽  
Shear Wave ◽  
Body Mass ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Shear Wave Elastography ◽  
Excess Weight ◽  
The Mean ◽  
Lean Children

Aim: To determine the early effects of excess weight on renal cortical stiffness in children and adolescents using point shear wave elastography (pSWE). Materials and methods: One hundred and forty-six overweight and obese children (43.2% male; mean age, 12.6±2.9 years: range 4.3-18) and 48 lean children (27.1% male: mean age, 12.4±3.4: range 4.8-18.9) were included in the study and control group, respectively. pSWE measurements of the two kidneys were performed. The mean value of shear wave velocity was compared between groups. Results: The mean shear wave velocity was 2.79±0.53 m/s for the control subjects and 3.09±0.59 m/s for the overweight-obese subjects. The differences between the two groups were sta-tistically significant (p=0.001). There was no correlation between shear wave velocity and age or depth. A positive correlation was found between shear wave velocity and body mass index, body mass index-standard deviation score. Conclusion: Renal cortical stiffness was higher in children with excess weight than in lean children. This study is the first attempt at applying pSWE to investigate the early adverse effects of excess weight.

scholarly journals Korelasi Antara Nilai SPT-N dan Kecepatan Gelombang Geser (Shear Wave Velocity) Dalam Bidang Engineering

JURNAL HADRON ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 36-43
Author(s):  
Sabrian Tri Anda
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Non Invasive

Metode geofisika telah digunakan secara luas dalam ranah keteknikan terutama dalam bidang investigasi terkait geoteknik. Metode geofisika dianggap mampu untuk menyajikan cakupan ruang lingkup pengukuran yang luas, dengan waktu pengukuran yang lebih efektif, non-invasive, dengan biaya yang tidak terlalu mahal jika dibandingkan dengan metode pengukuran secara tradisional yaitu menggunakan lubang bor untuk pengujian. Penelitian ini bertujuan untuk melihat hubungan antara parameter teknik seperti standard penetration blow count test (SPT-N) dan kecepatan rambat gelombang geser (shear wave velocity) dalam menentukan tingkat kekuatan tanah. Penelitian ini dilakukan di dua area terpisah dengan kondisi geologi yang berbeda pula. Studi area pertama terletak di Sungai Batu, Kedah, Malaysia dan area kedua terletak di komplek Universiti Sains Malaysia, Penang, Malaysia. Dari hasil pengukuran didapatkan bahwa keterkaitan antara nilai SPT-N dan kecepatan rambat gelombang S (geser) adalah sangat erat untuk kedua studi area. Hubungan keterkaitan ini dijabarkan berdasarkan nilai koefisien determinasi.

scholarly journals Area Covered for Shear Wave Velocity Calculation Affects the Shear Wave Velocity Values

2019 ◽  
Vol 35 (3) ◽  
pp. 182-187
Author(s):  
Amitabh Dashottar ◽  
Erin Montambault ◽  
Jeffrey R. Betz ◽  
Kevin D. Evans
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Region Of Interest ◽  
Ultrasound Elastography ◽  
Maximum Area ◽  
Shear Wave Velocities ◽  
Significant Difference ◽  
Technical Specifications ◽  
The Mean

Although ultrasound elastography is established as a reliable and valid tool for assessment of skeletal muscles, guidelines around the technical specifications, data selection, and acquisition parameters still lack consensus. One such parameter is the use of the quantification box (Q-box) that calculates the shear wave velocity/modulus, within a selected region of interest (ROI). Currently, no data compare the effect of the elastographic area within the ROI to the mean shear wave velocity calculations, using a Q-box. In this study, the mean shear wave velocity calculated over a smaller (single Q-box) ROI is compared to the mean shear wave velocity calculated over maximum area of elastogram, within a ROI. Comparison of mean shear wave velocity revealed a significant difference ( t = 2.79, P = .007) between the means calculated over maximum area of elastogram for only nonuniform elastograms. The rater agreement for the classification scheme was assessed (κ = 0.85). To prevent possible overestimation of shear wave velocities, it may be necessary to place the Q-box over the maximum elastographic area.

Shear-wave velocity profiling at sites with high stiffness contrasts: a comparison between invasive and non-invasive methods

2009 ◽  
Vol 8 (1) ◽  
pp. 75-94 ◽  
Author(s):  
Michele Cercato ◽  
Fabrizio Cara ◽  
Ettore Cardarelli ◽  
Gerardina Di Filippo ◽  
Giuseppe Di Giulio ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Non Invasive ◽  
High Stiffness

Comparison of Invasive and Non-Invasive Methods in Site Response, Case Study: Soil Deposits of La Estrella

2021 ◽  
Vol 906 (1) ◽  
pp. 012119
Author(s):  
Daniel Largo ◽  
César Hidalgo ◽  
Juan Olarte
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Spectrum Analysis ◽  
Site Response ◽  
Response Spectrum ◽  
Response Spectrum Analysis ◽  
Non Invasive ◽  
Soil Deposits ◽  
Relative Differences

Abstract A great part of the Colombian territory is under medium to high seismic hazard due to the complex tectonic condition, which in turn affects, particularly, areas where the population density is highest. A response spectrum analysis of the ground is currently required by seismic design codes for site response analysis. For this, the shear wave velocity (Vs) profile must be established. The use of seismic invasive methods such as Down Hole or Cross Hole for the determination of the shear wave velocity (Vs), has been typically recommended. In recent years, significant progress has been made in non-invasive seismic methods such as MasW (Multichannel Analysis of Surface Waves) and ReMi (Refraction Microtremor), in order to estimate the Vs profile from surface waves analysis. Due to the accessibility and low cost, these methods represent a viable alternative to determine the profile of Vs. In this project, the seismic response of soil deposits was evaluated in the La Estrella municipality located in the south of The Aburrá Valley. One-dimensional (1D) models were simulated by characterizing the soil profile through the shear wave velocity with MasW and ReMi seismic tests. The results were compared with models based on shear wave characterization through Down Hole methods. The 1D response spectrums were determined with an equivalent linear model in DEEPSOIL and GTS NX software. The resulting spectra were compared through relative difference and correlation coefficient. Final results demonstrated that the spectra present low relative differences for long periods, moderate relative differences for moderate periods, and low to moderate relative differences for short periods. The general correlation coefficients were 0.6. This was evidence that non-invasive seismic methods allow an appropriate response spectrum analysis.

scholarly journals Impact of Fibrotic Tissue on Shear Wave Velocity in Thyroid: AnEx VivoStudy with Fresh Thyroid Specimens

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Takahiro Fukuhara ◽  
Eriko Matsuda ◽  
Yukari Endo ◽  
Ryohei Donishi ◽  
Shoichiro Izawa ◽  
...  
Keyword(s):  
Lymph Node ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Metastatic Lymph Node ◽  
Pathological Examination ◽  
Metastatic Lymph ◽  
The Mean ◽  
Benign Thyroid ◽  
Severe Fibrosis

We sought to elucidate the correlation between shear wave velocity (SWV) and fibrosis in thyroid by precisely assessing pathological structures inside 5 × 5 mm2regions of interest (ROIs) of resected specimens, under conditions that excluded physical artifacts. The materials were unselected thyroid and lymph node specimens resected during thyroid surgery. Immediately after surgery, fresh unfixed thyroid and metastatic lymph node specimens were suspended in gel phantoms, and SWV was measured. Upon pathological examination of each specimen, the extent of fibrosis was graded as none, moderate, or severe. A total of 109 specimens were evaluated: 15 normal thyroid, 16 autoimmune thyroiditis, 40 malignant nodules, 19 benign thyroid nodules, and 19 metastatic lymph nodes. When all specimens were classified according to the degree of fibrosis determined by pathological imaging, the mean SWV was1.49±0.39 m/s for no fibrosis,2.13±0.66 m/s for moderate fibrosis, and2.68±0.82 m/s for severe fibrosis. The SWVs of samples with moderate and severe fibrosis were significantly higher than those of samples without fibrosis. The results of this study demonstrate that fibrosis plays an important role in determining stiffness, as measured by SWV in thyroid.

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