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MR elastography

Min Wang, Feng Gao, Xiaoqi Wang, Yanqing Liu, Ruoyun Ji, Lizhuo Cang, Yu Shi
BACKGROUND: Early detection and classification of chronic pancreatitis (CP) are both important and challenging. PURPOSE: To investigate the diagnostic performance of MR elastography (MRE) and T1 mapping of the pancreas for different stages of CP. STUDY TYPE: Retrospective. SUBJECTS: Clinical and imaging records of 81 patients (from 5/2015 to 7/2017) with suspected CP were analyzed. Patients were categorized into the normal control (n = 35), mild CP (n = 30), and moderate/severe CP groups (n = 16) according to the Cambridge Classification based on concordant endoscopic retrograde cholangiopancreatography or ultrasound endoscopy findings...
March 14, 2018: Journal of Magnetic Resonance Imaging: JMRI
Kiaran P McGee
No abstract text is available yet for this article.
February 23, 2018: Journal of the American College of Radiology: JACR
Veeral Ajmera, Rohit Loomba
Ultrasound and magnetic resonance (MR)-based elastography have demonstrated excellent performance for noninvasive staging of fibrosis in patients with nonalcoholic fatty liver disease (NAFLD); however, their ability to differentiate isolated fatty liver from nonalcoholic steatohepatitis (NASH) is unclear. In this review, the authors provide background on elastography and review the ability of elastography to discriminate between isolated steatosis and NASH. Studies with available data on the diagnosis of NASH histology are limited to vibration-controlled transient elastography and MR elastography...
February 2018: Seminars in Liver Disease
Andrew T Trout, Rachel M Sheridan, Suraj D Serai, Stavra A Xanthakos, Weizhe Su, Bin Zhang, Daniel B Wallihan
Purpose To assess the diagnostic performance of magnetic resonance (MR) elastography-derived liver stiffness to detect liver fibrosis in a pediatric and young adult population with a spectrum of liver diseases. Materials and Methods This retrospective study included patients younger than 21 years of age who underwent MR elastography and liver biopsy within 3 months of one another between January 2012 and September 2016 for indications other than liver transplantation or Fontan palliation of congenital heart disease...
February 22, 2018: Radiology
Davide Prezzi, Radhouene Neji, Christian Kelly-Morland, Hema Verma, Tim OʼBrien, Ben Challacombe, Archana Fernando, Ashish Chandra, Ralph Sinkus, Vicky Goh
OBJECTIVES: The aim of this study was to explore the feasibility of magnetic resonance elastography (MRE) for characterizing indeterminate small renal tumors (SRTs) as part of a multiparametric magnetic resonance (MR) imaging protocol. MATERIALS AND METHODS: After institutional review board approval and informed consent were obtained, 21 prospective adults (15 men; median age, 55 years; age range, 25-72 years) with SRT were enrolled. Tumors (2-5 cm Ø) were imaged using 3-directional, gradient echo MRE...
February 16, 2018: Investigative Radiology
Paul Kennedy, Mathilde Wagner, Laurent Castéra, Cheng William Hong, Curtis L Johnson, Claude B Sirlin, Bachir Taouli
Chronic liver diseases often result in the development of liver fibrosis and ultimately, cirrhosis. Treatment strategies and prognosis differ greatly depending on the severity of liver fibrosis, thus liver fibrosis staging is clinically relevant. Traditionally, liver biopsy has been the method of choice for fibrosis evaluation. Because of liver biopsy limitations, noninvasive methods have become a key research interest in the field. Elastography enables the noninvasive measurement of tissue mechanical properties through observation of shear-wave propagation in the tissue of interest...
March 2018: Radiology
Axel Lipp, Cornelia Skowronek, Andreas Fehlner, Kaspar-Josche Streitberger, Jürgen Braun, Ingolf Sack
OBJECTIVES: To apply three-dimensional multifrequency MR-elastography (3DMRE) for the measurement of local cerebral viscoelasticity changes in patients with Parkinson's disease (PD) and progressive supranuclear palsy (PSP). METHODS: T1-weighted anatomical imaging and 3DMRE were performed in 17 PD and 20 PSP patients as well as 12 controls. Two independent viscoelasticity parameters, |G*| and φ, were reconstructed combining seven harmonic vibration frequencies (30-60 Hz)...
February 19, 2018: European Radiology
Guilherme Moura Cunha, Cristiane A Villela-Nogueira, Anke Bergman, Flavia Paiva Proença Lobo Lopes
AIM: Multiparametric magnetic resonance imaging (mpMRI) may help determine the metabolic profile of patients with obesity and metabolic syndrome in addition to their clinical and laboratory biomarkers for diagnosis and monitoring. An abbreviated mpMRI protocol may be a faster, less-costly, and easier to perform alternative for the diagnosis, treatment, and follow-up of patients with NAFLD and for use in clinical trials. OBJECTIVE: To evaluate an abbreviated mpMRI protocol tailored to analyze quantitative imaging features of patients with obesity and NAFLD and assess its use during treatment...
February 15, 2018: Abdominal Radiology
Akira Yamada, Yasunari Fujinaga, Takeshi Suzuki, Daisuke Komatsu, Yoshihiro Kitoh, Yuji Iwadate, Atsushi Nozaki, Kazuhiko Ueda, Masumi Kadoya
AIM: The purpose of this study is to determine whether the liver stiffness (LS) measured on magnetic resonance elastography (MRE) can be estimated by combination of gadoxetate disodium (Gd-EOB-DTPA)-enhanced MR imaging (EOB-MRI) and ordinary blood tests. METHODS: We evaluated 33 consecutive patients with suspected liver disease who underwent EOB-MRI using a Differential Subsampling with Cartesian Ordering (DISCO) MR sequence and MRE using 1.5-T MR system in this prospective study...
February 2, 2018: Hepatology Research: the Official Journal of the Japan Society of Hepatology
Charlotte A Guertler, Ruth J Okamoto, John L Schmidt, Andrew A Badachhape, Curtis L Johnson, Philip V Bayly
The mechanical properties of brain tissue in vivo determine the response of the brain to rapid skull acceleration. These properties are thus of great interest to the developers of mathematical models of traumatic brain injury (TBI) or neurosurgical simulations. Animal models provide valuable insight that can improve TBI modeling. In this study we compare estimates of mechanical properties of the Yucatan mini-pig brain in vivo and ex vivo using magnetic resonance elastography (MRE) at multiple frequencies. MRE allows estimations of properties in soft tissue, either in vivo or ex vivo, by imaging harmonic shear wave propagation...
January 27, 2018: Journal of Biomechanics
Suraj D Serai, Anjani P Naidu, T Andrew Burrow, Carlos E Prada, Stavra Xanthakos, Alexander J Towbin
Gaucher disease (GD) is an autosomal-recessive lysosomal storage disease caused by a deficiency of the enzyme, glucocerebrocidase, resulting in accumulation of lipid-laden storage cells in multiple organs such as bone marrow, liver, spleen, and lungs. Type 1 Gaucher disease is the most common form of this condition in which the brain and spinal cord (the central nervous system) are not affected. The Gaucher disease severity scoring system (GD-DS3) is typically used to assess disease severity accounting for skeletal, hematologic, and visceral disease...
January 5, 2018: Molecular Genetics and Metabolism
Shintaro Ichikawa, Utaroh Motosugi, Makiko Omori, Katsuhiro Sano, Yoshie Omiya, Shuji Hirata, Hiroshi Onishi
We evaluated the value of magnetic resonance elastography (MRE) for the prediction of response to magnetic resonance-guided focused ultrasound (MRgFUS) for uterine fibroids. Eleven patients were enrolled. A fractional change of >30% in Symptoms Severity Score (SSS) was defined as a 'substantial symptomatic improvement' at 12 months after treatment. The fractional stiffness value reduction in the patients with a substantial improvement in SSS was significantly higher than that in those without (P = 0.0446)...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
Luciana Costa-Silva, Silvia Marinho Ferolla, Agnaldo Soares Lima, Paula Vieira Teixeira Vidigal, Teresa Cristina de Abreu Ferrari
OBJECTIVES: To evaluate the performance of magnetic resonance elastography (MRE) in diagnosing and staging hepatic fibrosis in patients with histologically confirmed nonalcoholic fatty liver disease (NAFLD) and in distinguishing simple steatosis from nonalcoholic steatohepatitis (NASH). METHODS: Ninety subjects (49 NAFLD patients and 41 healthy volunteers) were prospectively enrolled. Liver stiffness measured by MRE was correlated with the grade of fibrosis and/or inflammation determined by liver biopsy...
January 2018: European Journal of Radiology
Denis Le Bihan
Intravoxel Incoherent Motion (IVIM) refers to translational movements which within a given voxel and during the measurement time present a distribution of speeds in orientation and/or amplitude. The IVIM concept has been used to estimate perfusion in tissues as blood flow in randomly oriented capillaries mimics a pseudo-diffusion process. IVIM-based perfusion MRI, which does not require contrast agents, has gained momentum recently, especially in the field oncology. In this introductory review the basic concepts, models, technical requirements and limitations inherent to IVIM-based perfusion MRI are outlined, as well as new, non-perfusion applications of IVIM MRI, such as virtual MR Elastography...
December 22, 2017: NeuroImage
Daniel Fovargue, Sebastian Kozerke, Ralph Sinkus, David Nordsletten
As disease often alters structural and functional properties in tissue, the noninvasive measurement of material stiffness in vivo is desirable. Magnetic resonance elastography provides an approach to in vivo tissue characterization, using images of wave motion in tissue and biomechanical principles to reconstruct and quantify stiffness. Successful clinical translation of this technology requires stiffness reconstruction algorithms that are robust, easy to manage, and fast. In this paper, a reconstruction method is presented which addresses these issues by using a local compact divergence-free reconstruction kernel coupled with non-physical constraint elimination and inverse residual weighting to reliably reconstruct stiffness...
December 8, 2017: Medical Image Analysis
Zobair M Younossi, Rohit Loomba, Quentin M Anstee, Mary E Rinella, Elisabetta Bugianesi, Giulio Marchesini, Brent A Neuschwander-Tetri, Lawrence Serfaty, Francesco Negro, Stephen H Caldwell, Vlad Ratziu, Kathleen E Corey, Scott L Friedman, Manal F Abdelmalek, Stephen A Harrison, Arun J Sanyal, Joel E Lavine, Philippe Mathurin, Michael R Charlton, Zachary D Goodman, Naga P Chalasani, Kris V Kowdley, Jacob George, Keith Lindor
NAFLD is a spectrum comprised of isolated steatosis, NASH, advanced fibrosis, and cirrhosis. The majority of NAFLD subjects do not have NASH and don't carry a significant risk for adverse outcomes (cirrhosis and mortality). Globally, the prevalence of NAFLD is approximately 25%. In Asia, a gradient of high prevalence rates to low rates are noted from urban to rural areas. Given the prevalence of NAFLD, the clinical and economic burden of NAFLD and NASH can be substantial. With increasing recognition as an important liver disease, the diagnosis of NASH still requires a liver biopsy which is suboptimal...
December 9, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
Giuseppe Lo Re, Dario Picone, Federica Vernuccio, Laura Scopelliti, Ambra Di Piazza, Chiara Tudisca, Salvatore Serraino, Giambattista Privitera, Federico Midiri, Sergio Salerno, Massimo Midiri, Tommaso Vincenzo Bartolotta, Roberto Lagalla
Purpose: To evaluate and compare the mesenteric and bowel wall changes during Crohn's disease (CD) on ultrasonography (US) Strain Elastography (SE) and Enterography Magnetic Resonance Imaging (E-MRI). Methods: From July 2014 to September 2016, 35 patients with ileocolonoscopy diagnosis of CD were prospectively examined with E-MRI and in the same time with US and SE. Results: A total of 41 affected bowel segments and 35 unaffected bowel segments in 35 patients were evaluated...
2017: BioMed Research International
Ruo-Kun Li, Xin-Pin Ren, Fu-Hua Yan, Jin-Wei Qiang, Hui-Min Lin, Tao Wang, Hong-Fei Zhao, Wei-Bo Chen
PURPOSE: To compare the results of T1ρ MR imaging and 2D real-time shear-wave elastography (SWE) for liver fibrosis detection and staging. METHODS: Twenty-nine rabbit models of CCl4 -induced liver fibrosis were established and six untreated rabbits served as controls. T1ρ MR imaging and 2D real-time SWE examination were performed at 2, 4, 6, 8, 10, and 12 weeks. T1ρ values and liver stiffness (LS) values were measured. Fibrosis was staged according to the METAVIR scoring system...
December 2, 2017: Abdominal Radiology
Yi Sui, Shivaram P Arunachalam, Arvin Arani, Joshua D Trzasko, Phillip M Young, James F Glockner, Kevin J Glaser, David S Lake, Kiaran P McGee, Armando Manduca, Phillip J Rossman, Richard L Ehman, Philip A Araoz
PURPOSE: To implement a reduced field of view (rFOV) technique for cardiac MR elastography (MRE) and to demonstrate the improvement in image quality of both magnitude images and post-processed MRE stiffness maps compared to the conventional full field of view (full-FOV) acquisition. METHODS: With Institutional Review Board approval, 17 healthy volunteers underwent both full-FOV and rFOV cardiac MRE scans using 140-Hz vibrations. Two cardiac radiologists blindly compared the magnitude images and stiffness maps and graded the images based on several image quality attributes using a 5-point ordinal scale...
December 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Cecilia Besa, Mathilde Wagner, Grace Lo, Sonja Gordic, Manjil Chatterji, Paul Kennedy, Ashley Stueck, Swan Thung, James Babb, Andrew Smith, Bachir Taouli
BACKGROUND: Multiparametric magnetic resonance imaging (mpMRI) combining different techniques such as MR elastography (MRE) has emerged as a noninvasive approach to diagnose and stage liver fibrosis with high accuracy allowing for anatomical and functional information. PURPOSE: To assess the diagnostic performance of mpMRI including qualitative and quantitative assessment of MRE, liver surface nodularity (LSN) measurement, hepatic enhancement ratios postgadoxetic acid, and serum markers (APRI, FIB-4) for the detection of liver fibrosis...
November 28, 2017: Journal of Magnetic Resonance Imaging: JMRI
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