View clinical trials related to Elastography.
Filter by:The purpose of this study is to assess the reliability, reproducibility and accuracy of the paediatric probe of transient elastography in detecting liver fibrosis in children, besides its limitations and side effects. At the same time, to assess whether indirect fibrosis markers are a valid tool to detect absence or mild fibrosis in paediatric patients
The objective is to validate the use of ultrasound measurements (urethral mobility, movement of the ano-rectal angle, elastography measurements) in women with urinary incontiennce before and after pelvic floor muscle training (PFMT) : inter and intra-observer reproducibility; correlation with clinical examination (modified Oxford scale); sensitivity to change before/after pelvic floor muscle training
The objective of this study is: (1) to investigate the correlation of ultrasound parameters (SW speed, Dispersion slope, Attenuation value, Normalized Local Variance, Liver / Kidney Intensity Ratio) with the pathological parameters (fibrosis, intralobular inflammation, ballooning degeneration and steatosis); (2) to evaluate the diagnostic performance of SW speed for liver fibrosis, Dispersion slope for intralobular inflammation and Attenuation value for steatosis by comparison with the tissue diagnosis by liver biopsy.
A single-center, observational, prospective, single cohort study with before-after design. Evaluation by shear-wave elastography, measured in kilopascals (KPa), of the muscle, tendon and cubital nerve, before and after the maneuver of putting in tension of the ulnar nerve.
This study evaluates the deep dry needling technique as a percutaneous technique included in the professional field of physiotherapy. The project quantifies a significant limit on the number of local twitch responses necessary for the favorable treatment of myofascial pain and analyzes the injury degree and/or the repair of myofascial tissue, with "Elastography".
In clinical practice, compression ultrasound (CUS) has become an easy and reliable noninvasive tool for the diagnosis of deep vein thrombosis (DVT). Currently there are not validated methods to assess the biological age of venous thrombus, and the date of onset of thrombosis. One potential technique to age DVT is ultrasound elastography (UE). UE is a noninvasive technique to measure tissue hardness, and it is well known that thrombi harden as they age. The aim of this study will be to assess the ability of UE to distinguish acute from chronic DVT. The investigators will evaluate prospectively all consecutive outpatients presenting with clinically suspected unprovoked DVT of the lower limbs, and those having a previous diagnosis of DVT for the scheduled 3 months visit of follow-up, for a period of about one year. All the enrolled patients will undergo to the CUS of the lower limbs, and at the same time to the ultrasound elastography by the physician expert in vascular ultrasound. The specialist performing both examinations will be unaware of the time of onset of DVT (acute or chronic). Then the patients will be divided into two groups (group A: patients with acute DVT; group B: patients with chronic DVT at the 3rd month of follow-up). Each examination (CUS and ultrasound elastography) will be repeated three times in the same patient at the same visit, to assess the reproducibility of the technique. The demographic data, medical history, physical examination and the results of CUS and ultrasound elastography will be collected in a case report form (CRF) by another investigator who does not perform the examinations. The blinded CRF will be submitted to a dedicated committee for statistical analysis.
Elastography is an imaging of tissue elasticity or stiffness and is currently emerging as a mainstream tool for ultrasound-based diagnosis. This compressibility property of materials, mathematically expressed as the change in tissue displacement as a function of its distance from the compressing device, is known as strain and is the parameter that is imaged in an elastogram. Elastography has currently shown promising result in differentiating viscoelastic nature of various organs, which is a consequence of certain underlying diseases. At present, there are limited literatures revealing the application and feasibility of ultrasonic elastography in lung lesions. This is essentially important as it may serve as an adjuvant to B-mode ultrasound. The investigators aimed at exploring the application and feasibility of ultrasonic elastography on lung lesions.
For patients with thyroid gland nodule, fine-needle aspiration biopsy has been proved to be an efficient tool for thyroid cancer diagnosis. However, it is somewhat an invasive procedure and is subject to sampling and analysis uncertainties. Thus, improved, more reliable criteria for determining which nodule should be be aspirated are needed. Ultrasound elastography has been shown to be useful in the differential diagnosis of breast and prostate cancers. Ultrasound elastography also may discriminate malignant from benign nodule.
Primary sclerosing cholangitis (PSC) is a chronic liver disease that can lead to liver cirrhosis, liver failure and liver cancer. Assessment of disease status is important to determine optimal treatment but the diagnosis of PSC is challenging. There is a dire need of an accurate non-invasive tool for longitudinal assessment of PSC. MR Elastography (MRE) has been recently proven to estimate liver fibrosis noninvasively and accurately. Estimation of liver fibrosis by MRE along with imaging derived morphological information (MRCP) will be utilized in this study comprehensively to provide a surrogate non-invasive imaging biomarker for monitoring disease status in PSC. Successful outcomes will provide an opportunity for optimal treatment triage including liver transplantation via accurate and non-invasive estimation of true disease status in PSC.
Reliable methods of evaluating liver fibrosis using noninvasive techniques in the pediatric population are limited and inconclusive. Liver biopsy remains the gold standard; however, it requires sedation in pediatric patients, has a risk of hemorrhage, and provides unreliable results secondary to sampling error. Sonoelastography is a new method of evaluating liver disease that eliminates these pitfalls. There are 3 types of quantitative sonoelastography currently in use. Transient elastography is a non-imaging based technique used in adults to measure liver fibrosis in which a mechanical vibrator creates a low-frequency wave causing shear stress in the liver at a fixed depth. This technique does not work in small livers and, therefore, is not appropriate for pediatric patients. Acoustic Radiation Force Impulse Imaging (ARFI) and Shear Wave Imaging (SWE) use real-time ultrasonography and administer focused high-intensity, short-duration pulses to produce shear waves in the liver tissue. ARFI calculates the degree of tissue displacement and creates an elastogram or measurement of the stiffness of the sampled liver tissue without corresponding images. It is limited since only a small sample or region of interest (ROI) can be obtained, and it is unable to provide a corresponding elasticity map of the tissue. SWE is the newest elastography technique. It measures tiny displacements of tissue in a larger ROI with corresponding ultrasound images which provides a side by side image of the liver and color-coded elasticity map of the sampled tissue. Advantages include a larger ROI and simultaneous viewing of the selected region of interest which provides better anatomic detail with a corresponding color map of the tissue elasticity which may result in more accurate scoring of the stage of fibrosis. There are a few studies of ARFI in the pediatric population. Studies using SWE for evaluation of liver fibrosis are also few, and, all but one in adults. However, these studies have shown it to be an accurate method for liver fibrosis staging. Use of SWE in assessing liver fibrosis in pediatric patients may represent an accurate noninvasive alternative to liver biopsy in evaluating liver fibrosis as well as avoid the use of sedation.