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muscle elastography

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https://www.readbyqxmd.com/read/28108983/shear-wave-elastography-is-a-reliable-and-repeatable-method-for-measuring-the-elastic-modulus-of-the-rectus-femoris-muscle-and-patellar-tendon
#1
Serkan Taş, Mehmet Ruhi Onur, Seval Yılmaz, Abdullah Ruhi Soylu, Feza Korkusuz
OBJECTIVES: The purpose of this study was to determine intraobserver, interobserver, and inter-day reliability levels for stiffness measurements of the patellar tendon and rectus femoris muscle using shear wave elastography (SWE). METHODS: This study was conducted on 12 healthy male individuals. Two examiners measured mean shear wave velocity values of the patellar tendons and rectus femoris muscles of both extremities using a 9L4 (4-9 MHz) transducer and an Acuson S3000 ultrasound system (Siemens Medical Solutions, Mountain View, CA)...
January 21, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28076414/a-mri-compatible-combined-mechanical-loading-and-mr-elastography-setup-to-study-deformation-induced-skeletal-muscle-damage-in-rats
#2
Jules L Nelissen, Larry de Graaf, Willeke A Traa, Tom J L Schreurs, Kevin M Moerman, Aart J Nederveen, Ralph Sinkus, Cees W J Oomens, Klaas Nicolay, Gustav J Strijkers
Deformation of skeletal muscle in the proximity of bony structures may lead to deep tissue injury category of pressure ulcers. Changes in mechanical properties have been proposed as a risk factor in the development of deep tissue injury and may be useful as a diagnostic tool for early detection. MRE allows for the estimation of mechanical properties of soft tissue through analysis of shear wave data. The shear waves originate from vibrations induced by an external actuator placed on the tissue surface. In this study a combined Magnetic Resonance (MR) compatible indentation and MR Elastography (MRE) setup is presented to study mechanical properties associated with deep tissue injury in rats...
2017: PloS One
https://www.readbyqxmd.com/read/28065540/cardiac-shear-wave-velocity-detection-in-the-porcine-heart
#3
Hendrik J Vos, Bas M van Dalen, Ilkka Heinonen, Johan G Bosch, Oana Sorop, Dirk J Duncker, Antonius F W van der Steen, Nico de Jong
Cardiac muscle stiffness can potentially be estimated non-invasively with shear wave elastography. Shear waves are present on the septal wall after mitral and aortic valve closure, thus providing an opportunity to assess stiffness in early systole and early diastole. We report on the shear wave recordings of 22 minipigs with high-frame-rate echocardiography. The waves were captured with 4000 frames/s using a programmable commercial ultrasound machine. The wave pattern was extracted from the data through a local tissue velocity estimator based on one-lag autocorrelation...
January 5, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28003609/the-development-of-vibration-system-for-applying-magnetic-resonance-elastography-mre-to-the-supraspinatus-muscle
#4
Daiki Ito, Tomokazu Numano, Kazuyuki Mizuhara, Kouichi Takamoto, Takaaki Onishi, Hisao Nishijo
Palpation is a standard clinical tool to diagnose abnormal stiffness changes in soft tissues. However, it is difficult to palpate the supraspinatus muscle because it locates under the trapezius muscle. The magnetic resonance elastography (MRE) uses harmonic mechanical excitation to quantitatively measure the stiffness (shear modulus) of both the superficial and deep tissues. The purpose of this study was to build a vibration system for applying the MRE to the supraspinatus muscle. In this study, a power amplifier and a pneumatic pressure generator were used to supply vibrations to a vibration pad...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27988462/spatial-distribution-of-airway-wall-displacements-during-breathing-and-bronchoconstriction-measured-by-ultrasound-elastography-using-finite-element-image-registration
#5
Brian C Harvey, Kenneth R Lutchen, Paul E Barbone
With every breath, the airways within the lungs are strained. This periodic stretching is thought to play an important role in determining airway caliber in health and disease. Particularly, deep breaths can mitigate excessive airway narrowing in healthy subjects, but this beneficial effect is absent in asthmatics, perhaps due to an inability to stretch the airway smooth muscle (ASM) embedded within an airway wall. The heterogeneous composition throughout an airway wall likely modulates the strain felt by the ASM but the magnitude of ASM strain is difficult to measure directly...
March 2017: Ultrasonics
https://www.readbyqxmd.com/read/27977870/ultrasound-elastography-assessment-of-the-median-nerve-in-leprosy-patients
#6
Marcello H Nogueira-Barbosa, Helena B Lugão, Everaldo Gregio-Júnior, Michel D Crema, Mariana T T Kobayashi, Marco A C Frade, Theo Z Pavan, Antonio A O Carneiro
INTRODUCTION: We sought to compare median nerve elasticity between leprosy patients (LP) and healthy volunteers (HV) using ultrasound elastography (UE). METHODS: Two radiologists independently measured the strain ratio of the median nerve/flexor digitorum superficialis muscle (MN/FDSM) of 18 LP and 18 HV using real-time freehand UE. Statistical analysis included intra-class correlation coefficients (ICC) and Mann-Whitney test. RESULTS: The MN/FDSM strain ratio of the LP and HV were 2...
December 15, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27928468/sonoelastography-in-the-musculoskeletal-system-current-role-and-future-directions
#7
REVIEW
Naomi Winn, Radhesh Lalam, Victor Cassar-Pullicino
Ultrasound is an essential modality within musculoskeletal imaging, with the recent addition of elastography. The elastic properties of tissues are different from the acoustic impedance used to create B mode imaging and the flow properties used within Doppler imaging, hence elastography provides a different form of tissue assessment. The current role of ultrasound elastography in the musculoskeletal system will be reviewed, in particular with reference to muscles, tendons, ligaments, joints and soft tissue tumours...
November 28, 2016: World Journal of Radiology
https://www.readbyqxmd.com/read/27914201/shear-wave-ultrasound-elastographic-evaluation-of-the-rotator-cuff-tendon
#8
Stephanie W Hou, Alexander N Merkle, James S Babb, Robert McCabe, Soterios Gyftopoulos, Ronald S Adler
OBJECTIVES: (1) Assess the association between the B-mode morphologic appearance and elasticity in the rotator cuff tendon using shear wave elastography (SWE). (2) Assess the association between SWE and symptoms. METHODS: Institutional Review Board approval and informed consent were obtained. A retrospective review identified 21 studies in 19 eligible patients for whom SWE was performed during routine sonographic evaluations for shoulder pain. Evaluations were compared with 55 studies from 16 asymptomatic volunteers and 6 patients with asymptomatic contralateral shoulders...
January 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27913925/changes-in-stiffness-of-the-dorsal-scapular-muscles-before-and-after-computer-work-a-comparison-between-individuals-with-and-without-neck-and-shoulder-complaints
#9
Hiroaki Ishikawa, Takayuki Muraki, Shuhei Morise, Yusuke Sekiguchi, Nobuyuki Yamamoto, Eiji Itoi, Shin-Ichi Izumi
PURPOSE: The aim of this study was to compare the stiffness of the dorsal scapular muscles before and after computer work between individuals with and without neck and shoulder complaints. METHODS: Thirty subjects were divided into patient (n = 18) and control (n = 12) groups. The stiffness of the upper trapezius, levator scapulae, and rhomboid major was measured using ultrasound elastography before and after a 30-min typing task. The strain ratio of the muscle to an acoustic coupler was calculated (a lower strain ratio value indicates greater muscle stiffness)...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27913924/shear-wave-elastography-reveals-different-degrees-of-passive-and-active-stiffness-of-the-neck-extensor-muscles
#10
Angela V Dieterich, Ricardo J Andrade, Guillaume Le Sant, Deborah Falla, Frank Petzke, François Hug, Antoine Nordez
PURPOSE: The neck extensor muscles contribute to spinal support and posture while performing head and neck motion. Muscle stiffness relates to passive elasticity (support) and active tensioning (posture and movement) of muscle. It was hypothesized that support and motion requirements are reflected in the distribution of stiffness between superficial and deep neck extensor muscles. METHODS: In ten healthy participants, shear modulus (stiffness) of five neck extensor muscles was determined in prone at rest and during isometric head lift at three intensities using shear wave elastography...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27913343/a-frequency-shift-method-to-measure-shear-wave-attenuation-in-soft-tissues
#11
Simon Bernard, Siavash Kazemirad, Guy Cloutier
In vivo quantification of shear wave attenuation in soft tissues may help to better understand human tissue rheology and lead to new diagnostic strategies. Attenuation is difficult to measure in acoustic radiation force elastography because the shear wave amplitude decreases due to a combination of diffraction and viscous attenuation. Diffraction correction requires assuming a cylindrical wavefront and an isotropic propagation medium, which may not be the case in some applications. In this study, the frequency shift method, used in ultrasound imaging and seismology, was adapted for shear wave attenuation measurement in elastography...
December 1, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27904961/muscle-elastography-a-new-imaging-technique-for-multiple-sclerosis-spasticity-measurement
#12
G Illomei, G Spinicci, E Locci, M G Marrosu
Multiple sclerosis (MS) spasticity is currently evaluated on the basis of neurological examinations such as Ashworth Scale (AS) and 0-10 NRS. Severity of spasticity is difficult to quantify. We investigated the use of real time elastography (RTHE) ultrasounds for evaluating objectively the muscle fibers status in MS spasticity patients and their changes after a new antispasticity treatment. Two studies were performed. In study A, 110 MS patients underwent a neurological evaluation based on the AS and RTHE. The RTHE images were scored with the new 1-5 muscle fibers rigidity imaging scale, here called MEMSs (Muscle Elastography Multiple Sclerosis Score)...
November 30, 2016: Neurological Sciences
https://www.readbyqxmd.com/read/27874499/muscle-elastography-in-multiple-sclerosis-spasticity
#13
Giovanni Illomei
Ultrasound elastography is a novel imaging modality for evaluating the elasticity of biological tissues. The technique is widely used in oncology to detect and differentiate malignant lesions in soft tissues. Studies have explored use of ultrasound elastography to measure the mechanical properties of muscle in patients with multiple sclerosis spasticity. Real-time elastography was shown to correlate well with subjective scales commonly used to measure MS spasticity. Ultrasound elastography has the potential to become a new objective gold standard to monitor symptom evolution in patients with MS spasticity and to evaluate the efficacy of antispasticity treatment...
December 2016: Neurodegenerative Disease Management
https://www.readbyqxmd.com/read/27854210/skeletal-muscle-quantitative-nuclear-magnetic-resonance-imaging-and-spectroscopy-as-an-outcome-measure-for-clinical-trials
#14
Pierre G Carlier, Benjamin Marty, Olivier Scheidegger, Paulo Loureiro de Sousa, Pierre-Yves Baudin, Eduard Snezhko, Dmitry Vlodavets
Recent years have seen tremendous progress towards therapy of many previously incurable neuromuscular diseases. This new context has acted as a driving force for the development of novel non-invasive outcome measures. These can be organized in three main categories: functional tools, fluid biomarkers and imagery. In the latest category, nuclear magnetic resonance imaging (NMRI) offers a considerable range of possibilities for the characterization of skeletal muscle composition, function and metabolism. Nowadays, three NMR outcome measures are frequently integrated in clinical research protocols...
March 3, 2016: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/27847244/effect-of-scapular-stabilization-during-cross-body-stretch-on-the-hardness-of-infraspinatus-teres-minor-and-deltoid-muscles-an-ultrasonic-shear-wave-elastography-study
#15
Jun Umehara, Satoshi Hasegawa, Masatoshi Nakamura, Satoru Nishishita, Hiroki Umegaki, Hiroki Tanaka, Kosuke Fujita, Ken Kusano, Noriaki Ichihashi
BACKGROUND: Posterior shoulder tightness is a contributing factor to shoulder injuries. Cross-body stretch is a method frequently prescribed to stretch the posterior shoulder structures. This stretching is performed horizontally adducting the shoulder with or without manual stabilization of the scapula by the therapist. However, no studies have investigated the effect of scapular stabilization during cross-body stretch using shear elastic modulus as an index of muscle hardness in vivo...
October 12, 2016: Manual Therapy
https://www.readbyqxmd.com/read/27845853/delayed-onset-muscle-soreness-temporal-assessment-with-quantitative-mri-and-shear-wave-ultrasound-elastography
#16
Christoph A Agten, Florian M Buck, Linda Dyer, Martin Flück, Christian W A Pfirrmann, Andrea B Rosskopf
OBJECTIVE: The objective of our study was to assess delayed-onset muscle soreness (DOMS) over time using quantitative MRI and shear-wave ultrasound (US) elastography. SUBJECTS AND METHODS: Five male (mean age ± SD, 39.6 ± 4.6 years) and five female (30.6 ± 13.5 years) volunteers underwent 1.5-T MRI before and after (15 minutes, 1 day, 3 days, 7 days) performing unilateral eccentric resistance exercise of the elbow flexor muscles. The MRI examinations included fluid-sensitive, DWI, and diffusion-tensor imaging sequences of the distal upper arm...
November 15, 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27845660/investigating-shear-wave-physics-in-a-generic-left-ventricular-model-via-in-vitro-experiments-and-finite-element-simulations
#17
Annette Caenen, Mathieu Pernot, Darya Shcherbakova, Luc Mertens, Mathias Kersemans, Patrick Segers, Abigail Swillens
Shear wave elastography (SWE) is a potentially valuable tool to non-invasively assess ventricular function in children with cardiac disorders, which could help in the early detection of abnormalities in muscle characteristics. Initial experiments demonstrated the potential of this technique in measuring ventricular stiffness, however, its performance remains to be validated as complicated shear wave (SW) propagation characteristics are expected to arise due to the complex non-homogeneous structure of the myocardium...
November 9, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27753239/application-of-shear-wave-elastography-to-estimate-the-stiffness-of-the-male-striated-urethral-sphincter-during-voluntary-contractions
#18
Ryan E Stafford, Rafeef Aljuraifani, François Hug, Paul W Hodges
OBJECTIVES: To investigate whether increases in stiffness can be detected in the anatomical region associated with the striated urethral sphincter during voluntary activation using shear wave elastography; to identify the location and area of the stiffness increase relative to the point of greatest dorsal displacement of the mid urethra (i.e. striated urethral sphincter); and to determine the relationship between muscle stiffness and contraction intensity. SUBJECTS AND METHODS: Ten healthy men participated...
October 18, 2016: BJU International
https://www.readbyqxmd.com/read/27742550/transient-elastography-as-a-noninvasive-assessment-tool-for-hepatopathies-of-different-etiology-in-pediatric-type-1-diabetes-mellitus
#19
Zeinab A Elkabbany, Nancy S Elbarbary, Eman A Ismail, Nesrine A Mohamed, Dina Ragab, Shereen Abdel Alem, Yasmine M Ezzat, Sarah S Maurice, Noha U Hashem
AIM: To identify the prevalence and effect of hepatopathies of different etiologies among pediatric patients with type 1 diabetes mellitus (T1DM) using transient elastography (TE) and its relation to glycemic control. METHODS: One hundred T1DM patients were studied focusing on liver functions, fasting lipid profile, hemoglobin A1c (HbA1c), hepatitis C virus (HCV), serum immunoglobulins, autoimmune antibodies; anti-nuclear antibody (ANA), anti-smooth muscle antibody (ASMA), and anti-liver kidney microsomal antibody (anti-LKM)...
January 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27742141/evaluation-of-the-effect-of-an-anisotropic-medium-on-shear-wave-velocities-of-intra-muscular-gelatinous-inclusions
#20
Sébastien Aubry, Jean-Philippe Nueffer, Mathieu Carrié
In highly anisotropic biological tissues such as muscle or tendons, calculating Young's modulus from the shear wave speed (csw) by using shear wave elastography (SWE) involves a complex transversally isotropic rheological model not yet used in common practice. To our knowledge, the effect of muscle anisotropy on csw of intra-muscular lesions has not yet been investigated. The objective of our study was to define the effect of an anisotropic medium on csw of intra-muscular gelatinous inclusions. We conducted a prospective monocentric, in vitro study in order to examine the quantitative and qualitative SWE behavior of a 9-mm gelatinous intra-muscular implant depending on the orientation of the probe relative to the muscle fibers...
January 2017: Ultrasound in Medicine & Biology
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