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ultrasound elastography

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https://www.readbyqxmd.com/read/29033431/diagnostic-challenge-in-pancreatic-sarcoidosis-using-endoscopic-ultrasonography
#1
Nobuaki Azemoto, Teru Kumagi, Mitsuhito Koizumi, Taira Kuroda, Hirofumi Yamanishi, Yoshinori Ohno, Yoshiki Imamura, Eiji Takeshita, Yoshiko Soga, Yoshiou Ikeda, Morikazu Onji, Yoichi Hiasa
We herein report a 55-year-old woman who presented with erythema and bilateral hilar lymphadenopathy 4 months prior to the detection of pancreatic lesions on an ultrasound. A skin biopsy showed evidence of sarcoidosis. The largest lesion in the tail of the pancreas was hypoechoic on endoscopic ultrasonography (EUS). The lesion was initially iso-enhanced on contrast enhanced-EUS (CE-EUS) but subsequently became hypoenhanced. The lesion revealed heterogeneous components of both soft and hard tissue on EUS elastography...
October 16, 2017: Internal Medicine
https://www.readbyqxmd.com/read/29032593/association-analysis-of-the-actn3-r577x-polymorphism-with-passive-muscle-stiffness-and-muscle-strain-injury
#2
Naokazu Miyamoto, Eri Miyamoto-Mikami, Kosuke Hirata, Noriko Kimura, Noriyuki Fuku
Passive muscle stiffness is considered to be a major factor affecting joint flexibility and is thought to relate to the occurrence of muscle strain injury. In skinned muscle fiber experiments, the R577X polymorphism of the α-actinin-3 gene (ACTN3) has been associated with passive muscle stiffness. Our primary purpose was to clarify whether the ACTN3 R577X polymorphism influences passive stiffness of human muscle in vivo. We also examined whether the ACTN3 R577X polymorphism is associated with the occurrence of hamstring strain injury...
October 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29031983/specific-ultrasound-data-acquisition-for-tissue-motion-and-strain-estimation-initial-results
#3
Elisabeth Brusseau, Adeline Bernard, Cyril Meynier, Philippe Chaudet, Valérie Detti, Guillaume Férin, Olivier Basset, An Nguyen-Dinh
Ultrasound applications such as elastography can benefit from 3-D data acquisition and processing. In this article, we describe a specific ultrasound probe, designed to acquire series of three adjacent imaging planes over time. This data acquisition makes it possible to consider the out-of-plane motion that can occur at the central plane during medium scanning, and is proposed with the aim of improving the results of strain imaging. In this first study, experiments were conducted on phantoms, and controlled axial and elevational displacements were applied to the probe using a motorized system...
October 11, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29031414/the-application-of-ultrasound-elastography-in-the-shoulder
#4
REVIEW
Jonas Schmalzl, Annabel Fenwick, Dirk Boehm, Fabian Gilbert
Ultrasound elastography (EUS) is a recently developed method for the assessment of tissue elasticity by applying mechanical stress and subsequently analyzing tissue displacement with ultrasound. To date, mainly two different techniques are used in clinical practice: strain (compression) EUS and shear wave EUS. However, shear wave EUS has been shown to be more examiner independent and more reliable as this technique allows a quantitative measurement of tissue elasticity. There is increasing evidence that EUS can be used to evaluate mechanical properties of musculoskeletal tissue...
October 11, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29031099/shear-wave-elastography-for-characterization-of-breast-lesions-shearlet-transform-and-local-binary-pattern-histogram-techniques
#5
U Rajendra Acharya, Wei Lin Ng, Kartini Rahmat, Vidya K Sudarshan, Joel E W Koh, Jen Hong Tan, Yuki Hagiwara, Arkadiusz Gertych, Farhana Fadzli, Chai Hong Yeong, Kwan Hoong Ng
Shear wave elastography (SWE) examination using ultrasound elastography (USE) is a popular imaging procedure for obtaining elasticity information of breast lesions. Elasticity parameters obtained through SWE can be used as biomarkers that can distinguish malignant breast lesions from benign ones. Furthermore, the elasticity parameters extracted from SWE can speed up the diagnosis and possibly reduce human errors. In this paper, Shearlet transform and local binary pattern histograms (LBPH) are proposed as an original algorithm to differentiate malignant and benign breast lesions...
October 2, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29028279/liver-elastography-malignancy-prediction-lemp-score-for-noninvasive-characterization-of-focal-liver-lesions
#6
Ivica Grgurevic, Tomislav Bokun, Nermin N Salkic, Boris Brkljacic, Mirjana Vukelić-Markovic, Tajana Stoos-Veic, Gorana Aralica, Mislav Rakic, Tajana Filipec-Kanizaj, Annalisa Berzigotti
BACKGROUND & AIMS: To analyse elastographic characteristics of focal liver lesions (FLL)s and diagnostic performance of real-time two-dimensional shear-wave elastography (RT-2D-SWE) in order to differentiate benign and malignant FLLs. PATIENTS AND METHODS: Consecutive patients diagnosed with FLL by abdominal ultrasound (US) underwent RT-2D-SWE of FLL and non-infiltrated liver by intercostal approach over the right liver lobe. The nature of FLL was determined by diagnostic work-up, including at least one contrast-enhanced imaging modality (MDCT/MRI), check-up of target organs when metastatic disease was suspected and FLL biopsy in inconclusive cases...
October 13, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/29022743/noninvasive-evaluation-of-stable-renal-allograft-function-using-point-shear-wave-elastography
#7
Bom Jun Kim, Chan Kyo Kim, Jung Jae Park
OBJECTIVE: To investigate the feasibility of point shear-wave elastography (SWE) in evaluating patients with stable renal allograft function who underwent protocol biopsies. METHODS: Ninety-five patients with stable renal allograft function that underwent ultrasound (US)-guided biopsies at predefined time points (10 days or one year after transplantation) were enrolled. US and point SWE examinations were performed immediately before protocol biopsies. Patients were categorized into two groups: subclinical rejection (SCR) and non-SCR...
October 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29022643/the-efficiency-of-elastography-in-the-diagnostics-of-follicular-lesions-and-nodules-with-an-unequivocal-fna-result
#8
Martyna Wojtaszek-Nowicka, Dorota Słowińska-Klencka, Stanisław Sporny, Bożena Popowicz, Krzysztof Kuzdak, Lech Pomorski, Krzysztof Kaczka, Jan Sopiński, Mariusz Klencki
INTRODUCTION: The aim was to assess the usefulness of strain elastography (SEG) in the diagnostics of two groups of thyroid nodules (TNs): follicular lesions (FL) with low malignancy risk (< 20.0%) and low percentage of papillary carcinomas (PTCs) among cancers as well as TNs with unequivocal cytology (UC) and high percentage of PTCs among cancers. MATERIAL AND METHODS: 168 TNs were analysed and eventually surgically treated: 100 UC (50 benign and 50 malignant - 90...
October 12, 2017: Endokrynologia Polska
https://www.readbyqxmd.com/read/28991387/soft-tissue-rheology-and-its-implications-for-elastography-challenges-and-opportunities
#9
Lynne E Bilston
Magnetic resonance elastography and related shear wave ultrasound elastography techniques can be used to estimate the mechanical properties of soft tissues in vivo by using the relationships between wave propagation and the elastic properties of materials. These techniques have found numerous clinical and research applications, tracking changes in tissue properties as a result of disease or other interventions. Most dynamic elastography approaches estimate tissue elastic (or viscoelastic) properties from a simplified version of the equations for the propagation of acoustic waves through a homogeneous linear (visco)elastic medium...
October 9, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28988274/ultrasound-or-mr-elastography%C3%A2-of-liver-which-one-shall-i-use
#10
Meng Yin, Sudhakar K Venkatesh
Liver stiffness is now a well-established noninvasive biomarker for assessing fibrosis in chronic liver disease. MRI-based and ultrasound-based dynamic elastography techniques have been introduced for assessment of liver stiffness and useful in clinical staging of hepatic fibrosis. Several different elastography techniques are now available with each method having inherent strengths and limitations. The published literature generally indicates that MR elastography has a higher diagnostic performance and fewer technical failures than ultrasound-based elastography techniques in assessing hepatic fibrosis...
October 7, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28988152/acute-effects-of-static-stretching-on-the-shear-elastic-moduli-of-the-medial-and-lateral-gastrocnemius-muscles-in-young-and-elderly-women
#11
Masatoshi Nakamura, Tome Ikezoe, Satoru Nishishita, Jun Umehara, Misaka Kimura, Noriaki Ichihashi
PURPOSE: Generally, static stretching (SS) is the recommended intervention for a decline in the range of motion among elderly adults. However, no study has investigated the acute effects of SS on the shear elastic modulus in elderly people. The aims of the present study were to investigate the acute effects of SS on the shear elastic moduli of the medial and lateral gastrocnemius muscles and to examine the differences in these acute effects between young and elderly women. METHODS: This study included 15 healthy young women (age: 23...
September 25, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28987700/dual-modal-computer-assisted-evaluation-of-axillary-lymph-node-metastasis-in-breast-cancer-patients-on-both-real-time-elastography-and-b-mode-ultrasound
#12
Qi Zhang, Jingfeng Suo, Wanying Chang, Jun Shi, Man Chen
PURPOSE: To propose a computer-assisted method for quantifying the hardness of an axillary lymph node on real-time elastography (RTE) and its morphology on B-mode ultrasound; and to combine the dual-modal features for differentiation of metastatic and benign axillary lymph nodes in breast cancer patients. MATERIALS AND METHODS: A total of 161 axillary lymph nodes (benign, n=69; metastatic, n=92) from 158 patients with breast cancer were examined with both B-mode ultrasound and RTE...
October 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28987667/shear-wave-elastography-findings-of-de-quervain-tenosynovitis
#13
Rustu Turkay, Ercan Inci, Banu Aydeniz, Meltem Vural
OBJECTIVE: Our aim was to evaluate the feasibility of using shear wave elastography (SWE) to assess first extensor compartment tendons rigidity and its alterations with tenosynovitis. MATERIALS AND METHODS: We performed B-mode ultrasound and SWE to total number of 80 participants. All participants were evaluated clinically to call the diagnosis of de Quervain tenosynovitis or to rule out the diagnosis. We composed 2 groups. Group 1 included 40 healthy volunteers (33 females and 7 male participants with ages ranging from 24 to 60 years, median age was 37...
October 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28985885/head-and-neck-ultrasound-technical-advances-novel-applications-and-the-role-of-elastography
#14
REVIEW
A S McQueen, K S Bhatia
High-resolution ultrasound (US) provides superb anatomical detail in the superficial anatomy of the neck and has become the first-line imaging investigation for neck lumps and a crucial component of clinical pathways. In this article, a wide range of advances in neck US are described with a focus on the emerging role of ultrasound elastography. Selected examples of clinical utility are presented across a spectrum of scenarios with discussion of newer applications, service delivery, and training issues. The changing role of the neck ultrasound practitioner and the future of the technique in the head and neck are considered...
October 3, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28982296/shear-wave-elastography-in-thyroid-nodules-with-indeterminate-cytology-results-of-a-prospective-bicentric-study
#15
Stéphane Bardet, Renaud Ciappuccini, Claire Pellot-Barakat, Hervé Monpeyssen, Jean-Jacques Michels, Frédérique Tissier, David Blanchard, Fabrice Menegaux, Dominique De Raucourt, Muriel Lefort, Yves Reznik, Agnes Rouxel, Natacha Heutte, Frédérique Brenac, Alexandra Leconte, Camille Buffet, Bénédicte Clarisse, Laurence Leenhardt
BACKGROUND: The clinical management of thyroid nodules with indeterminate cytology (IC) remains challenging. The role of shear wave elastography (SWE) in this setting is controversial. The aim of the study was to assess the performances of SWE in terms of prediction of malignancy, reproducibility, and combined analysis with ultrasound (US) examination in thyroid nodules with IC. METHODS: This prospective study was conducted in two referral centers. Eligible patients had a thyroid nodule ≥15 mm with IC (Bethesda class III to V) for which surgery had been recommended...
October 6, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/28981243/-treatments-of-non-alcoholic-steatohepatitis
#16
T Gustot
Non-alcoholic fatty liver diseases are highly prevalent in Western countries and associated with insulin resitance and metabolic syndrome. Non-alcoholic steatohepatitis (NASH) is characterized by lobular inflammation and hepatocellular ballooning, and may be associated with liver fibrosis leading to cirrhosis and its complications as hepatocarcinoma. The presence of obesity, type 2 diabetes mellitus or increased liver enzymes in patients with metabolic syndrome should prompt non-invasive screening (liver ultrasound, serum markers and/or transient elastography) to predict steatosis, NASH and fibrosis...
2017: Revue Médicale de Bruxelles
https://www.readbyqxmd.com/read/28979212/muscle-shear-moduli-changes-and-frequency-of-alternate-muscle-activity-of-plantar-flexor-synergists-induced-by-prolonged-low-level-contraction
#17
Ryota Akagi, Takahito Fukui, Masato Kubota, Masashi Nakamura, Ryoichi Ema
During prolonged low-level contractions, synergist muscles are activated in an alternating pattern of activity and silence called as alternate muscle activity. Resting muscle stiffness is considered to increase due to muscle fatigue. Thus, we investigated whether the difference in the extent of fatigue of each plantar flexor synergist corresponded to the difference in the frequency of alternate muscle activity between the synergists using muscle shear modulus as an index of muscle stiffness. Nineteen young men voluntarily participated in this study...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28967501/intra-individual-comparison-between-2-d-shear-wave-elastography-ge-system-and-virtual-touch-tissue-quantification-siemens-system-in-grading-liver-fibrosis
#18
Rosa M S Sigrist, Ahmed El Kaffas, R Brooke Jeffrey, Jarrett Rosenberg, Jürgen K Willmann
Ultrasound-based shear wave elastography (SWE) has recently gained substantial attention for non-invasive assessment of liver fibrosis. The purpose of this study was to perform an intra-individual comparison between 2-D shear wave elastography (2-D-SWE with a GE system) and Virtual Touch Tissue Quantification (VTTQ with a Siemens system) to assess whether these can be used interchangeably to grade fibrosis. Ninety-three patients (51 men, 42 women; mean age, 54 y) with liver disease of various etiologies (hepatitis B virus = 47, hepatitis C virus = 22; alcohol = 6, non-alcoholic steatohepatitis = 5, other = 13) were included...
September 26, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28966288/ultrasound-evaluation-of-liver-stiffness-accuracy-of-ultrasound-imaging-for-the-prediction-of-liver-cirrhosis-as-evaluated-using-a-liver-stiffness-measurement
#19
Momoe Endo, Yoko Soroida, Masaya Sato, Tamaki Kobayashi, Hiromi Hikita, Mamiko Sato, Hiroaki Gotoh, Tomomi Iwai, Shinji Sone, Tetsuo Sasano, Yuki Sumi, Kazuhiko Koike, Yutaka Yatomi, Hitoshi Ikeda
BACKGROUND AND AIMS: Because of the low penetration rate of transient elastography (TE) or its limitations in patients with obesity, narrow intercostal spaces, or ascites, the physical appearance of the liver as visualized using ultrasonography (US) is still thought to provide important information for the prediction of liver fibrosis. We examined the accuracy of various US signs when assessing the presence of liver cirrhosis, compared with TE. METHODS: We enrolled 189 patients who had undergone both conventional US and TE examinations...
2017: Journal of Medical and Dental Sciences
https://www.readbyqxmd.com/read/28964958/hepatitis-b-virus-reactivation-after-heart-transplant-incidence-and-clinical-impact
#20
Martina Vitrone, Domenico Iossa, Luca Rinaldi, Pia Clara Pafundi, Rosa Molaro, Antonio Parrella, Roberto Andini, Enrico Ragone, Ciro Maiello, Rosa Zampino, Emanuele Durante-Mangoni
BACKGROUND: Occult hepatitis B infection consists of persistence of HBV genomes in hepatocytes,absence of serum HBsAg, low/undetectable serum HBVDNA. Reactivation of HBV infection may occur during immunosuppression, but few data are available in heart transplant. OBJECTIVES: We followed-up heart recipients with or without markers of previous HBV infection,evaluating prevalence of HBV markers, incidence of HBV reactivation and its virological and clinical features...
September 23, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
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