keyword
MENU ▼
Read by QxMD icon Read
search

MR elastography

keyword
https://www.readbyqxmd.com/read/29128063/radiologic-imaging-in-nonalcoholic-fatty-liver-disease-and-nonalcoholic-steatohepatitis
#1
REVIEW
Yonah B Esterson, Gregory M Grimaldi
The article reviews the multimodality (ultrasound, computed tomography, and magnetic resonance [MR]) imaging appearance of nonalcoholic fatty liver disease (NAFLD) and discusses the radiologic diagnostic criteria as well as the sensitivity and specificity of these imaging methods. The authors review the role of both ultrasound and MR elastography for the diagnosis of fibrosis and for the longitudinal evaluation of patients following therapeutic intervention. Lastly, the authors briefly discuss the screening and diagnosis of hepatocellular carcinoma in patients with NAFLD, as there are special considerations in this population...
February 2018: Clinics in Liver Disease
https://www.readbyqxmd.com/read/29103478/liver-investigations-updating-on-us-technique-and-contrast-enhanced-ultrasound-ceus
#2
REVIEW
Valentina Battaglia, Rosa Cervelli
Over the past few years, the cross sectional imaging techniques (Computed Tomography - CT and Magnetic Resonance - MR) have improved, allowing a more efficient study of focal and diffuse liver diseases. Many papers had been published about the results of a routinely clinical use of the dual source/dual energy CT techniques and the use of hepatobiliary contrast agents in MR liver studies. As a consequence, these new improvements have diverted the attention away from the Ultrasound technique and its technical and conceptual evolutions...
November 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29101980/acr-appropriateness-criteria-%C3%A2-chronic-liver%C3%A2-disease
#3
Jeanne M Horowitz, Ihab R Kamel, Hina Arif-Tiwari, Sumeet K Asrani, Nicole M Hindman, Harmeet Kaur, Michelle M McNamara, Richard B Noto, Aliya Qayyum, Tasneem Lalani
Because liver fibrosis can be treated, it is important to diagnose liver fibrosis noninvasively and monitor response to treatment. Although ultrasound (grayscale and Doppler) can diagnose cirrhosis, it does so unreliably using morphologic and sonographic features and cannot diagnose the earlier, treatable stages of hepatic fibrosis. Transient elastography, ultrasound elastography with acoustic radiation force impulse, and MR elastography are modalities that can assess for hepatic fibrosis. Although all international organizations recommend ultrasound for screening for hepatocellular carcinoma, ultrasound is particularly limited for identifying hepatocellular carcinoma in patients with obesity, nonalcoholic fatty liver disease, and nodular cirrhotic livers...
November 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/29075525/chest-wall-underappreciated-structure-in-sonography-part-i-examination-methodology-and-ultrasound-anatomy
#4
REVIEW
Andrzej Smereczyński, Katarzyna Kołaczyk, Elżbieta Bernatowicz
Chest wall ultrasound has been awarded little interest in the literature, with chest wall anatomy described only in limited extent. The objective of this study has been to discuss the methodology of chest wall ultrasound and the sonographic anatomy of the region to facilitate professional evaluation of this complex structure. The primarily used transducer is a 7-12 MHz linear one. A 3-5 MHz convex (curvilinear) transducer may also be helpful, especially in obese and very muscular patients. Doppler and panoramic imaging options are essential...
September 2017: Journal of Ultrasonography
https://www.readbyqxmd.com/read/29074637/mr-elastography-analysis-of-glioma-stiffness-and-idh1-mutation-status
#5
K M Pepin, K P McGee, A Arani, D S Lake, K J Glaser, A Manduca, I F Parney, R L Ehman, J Huston
BACKGROUND AND PURPOSE: Our aim was to noninvasively evaluate gliomas with MR elastography to characterize the relationship of tumor stiffness with tumor grade and mutations in the isocitrate dehydrogenase 1 (IDH1) gene. MATERIALS AND METHODS: Tumor stiffness properties were prospectively quantified in 18 patients (mean age, 42 years; 6 women) with histologically proved gliomas using MR elastography from 2014 to 2016. Images were acquired on a 3T MR imaging unit with a vibration frequency of 60 Hz...
October 26, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29060662/a-novel-3d-printed-mechanical-actuator-using-centrifugal-force-for-magnetic-resonance-elastography
#6
Wiebke Neumann, Lothar R Schad, Frank G Zollner
Magnetic resonance elastography (MRE) is a technique for the quantification of tissue stiffness during MR examinations. It requires consistent methods for mechanical shear wave induction to the region of interest in the human body to reliably quantify elastic properties of soft tissues. This work proposes a novel 3D-printed mechanical actuator using the principle of centrifugal force for wave induction. The driver consists of a 3D-printed turbine vibrator powered by compressed air (located inside the scanner room) and an active driver controlling the pressure of inflowing air (placed outside the scanner room)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29058962/performance-of-shear-wave-elastography-for-breast-masses-using-different-region-of-interest-roi-settings
#7
Ji Hyun Youk, Eun Ju Son, Kyunghwa Han, Hye Mi Gweon, Jeong-Ah Kim
Background Various size and shape of region of interest (ROI) can be applied for shear-wave elastography (SWE). Purpose To investigate the diagnostic performance of SWE according to ROI settings for breast masses. Material and Methods To measure elasticity for 142 lesions, ROIs were set as follows: circular ROIs 1 mm (ROI-1), 2 mm (ROI-2), and 3 mm (ROI-3) in diameter placed over the stiffest part of the mass; freehand ROIs drawn by tracing the border of mass (ROI-M) and the area of peritumoral increased stiffness (ROI-MR); and circular ROIs placed within the mass (ROI-C) and to encompass the area of peritumoral increased stiffness (ROI-CR)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29058029/increased-severity-of-liver-fat-content-and-liver-fibrosis-in-non-alcoholic-fatty-liver-disease-correlate-with-epicardial-fat-volume-in-type-2-diabetes-a-prospective-study
#8
Sharon S Brouha, Phirum Nguyen, Ricki Bettencourt, Claude B Sirlin, Rohit Loomba
OBJECTIVES: To determine whether severity of non-alcoholic fatty liver disease (NAFLD) and liver fibrosis quantitatively assessed in individuals with diabetes mellitus (DM)-2 correlate with increased coronary heart disease (CHD) risk using non-invasive markers. METHODS: We conducted a single-centre, prospective, cross-sectional study in 100 consecutive diabetic individuals without known CHD recruited between March 2013 and September 2014. History, physical examination, serum markers, cardiac computed tomography (CT), magnetic resonance (MR) imaging-estimated proton density fat fraction (PDFF) and MR elastography (MRE) were obtained for 95 participants...
October 20, 2017: European Radiology
https://www.readbyqxmd.com/read/29030995/magnetic-resonance-elastography-is-as-accurate-as-liver-biopsy-for-liver-fibrosis-staging
#9
Hiroyuki Morisaka, Utaroh Motosugi, Shintaro Ichikawa, Tadao Nakazawa, Tetsuo Kondo, Satoshi Funayama, Masanori Matsuda, Tomoaki Ichikawa, Hiroshi Onishi
BACKGROUND: Liver MR elastography (MRE) is available for the noninvasive assessment of liver fibrosis; however, no previous studies have compared the diagnostic ability of MRE with that of liver biopsy. PURPOSE: To compare the diagnostic accuracy of liver fibrosis staging between MRE-based methods and liver biopsy using the resected liver specimens as the reference standard. STUDY TYPE: A retrospective study at a single institution. POPULATION: In all, 200 patients who underwent preoperative MRE and subsequent surgical liver resection were included in this study...
October 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28993232/mr-elastography-of-the-brain-and-its-application-in-neurological-diseases
#10
REVIEW
Matthew C Murphy, John Huston, Richard L Ehman
Magnetic resonance elastography (MRE) is an imaging technique for noninvasively and quantitatively assessing tissue stiffness, akin to palpation. MRE is further able assess the mechanical properties of tissues that cannot be reached by hand including the brain. The technique is a three-step process beginning with the introduction of shear waves into the tissue of interest by applying an external vibration. Next, the resulting motion is imaged using a phase-contrast MR pulse sequence with motion encoding gradients that are synchronized to the vibration...
October 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/28988274/ultrasound-or-mr-elastography%C3%A2-of-liver-which-one-shall-i-use
#11
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/28986646/differentiation-of-benign-and-malignant-solid-pancreatic-masses-using-magnetic-resonance-elastography-with-spin-echo-echo-planar-imaging-and-three-dimensional-inversion-reconstruction-a-prospective-study
#12
Yu Shi, Feng Gao, Yue Li, Shengzhen Tao, Bing Yu, Zaiyi Liu, Yanqing Liu, Kevin J Glaser, Richard L Ehman, Qiyong Guo
OBJECTIVES: To determine the diagnostic performance of MR elastography (MRE) and compare it with serum CA19-9 in differentiating malignant from benign pancreatic masses, with emphasis on differentiating between pancreatic ductal adenocarcinoma (PDAC) and mass-forming pancreatitis (MFP). METHODS: We performed a prospective, consecutive, 24-month study in 85 patients with solid pancreatic masses confirmed by histopathologic examinations. The mass stiffness and stiffness ratio (calculated as the ratio of mass stiffness to the parenchymal stiffness) were assessed...
October 6, 2017: European Radiology
https://www.readbyqxmd.com/read/28965721/prospective-comparison-of-the-diagnostic-performance-of-magnetic-resonance-elastography-with-acoustic-radiation-force-impulse-elastography-for-pre-operative-staging-of-hepatic-fibrosis-in-patients-with-hepatocellular-carcinoma
#13
Chen-Te Chou, Ran-Chou Chen, Wen-Pei Wu, Ping-Yi Lin, Yao-Li Chen
The purpose of this study was to compare the diagnostic accuracy of magnetic resonance (MR) elastography with that of acoustic radiation force impulse (ARFI) elastography for pre-operative staging of hepatic fibrosis in patients with hepatocellular carcinoma. We prospectively enrolled 77 patients who were scheduled to undergo hepatectomy for hepatocellular carcinoma. Pre-operative MRE and ARFI elastography examinations were performed on the same day, and liver stiffness/velocity values were determined. Fibrosis stage and necro-inflammatory activity of resected specimens were determined histopathologically using the METAVIR scoring system...
September 28, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28952003/uterine-fibroids-correlations-between-mri-appearance-and-stiffness-via-magnetic-resonance-elastography
#14
Danielle E Jondal, Jin Wang, Jun Chen, Krzysztof R Gorny, Joel Felmlee, Gina Hesly, Shannon Laughlin-Tommaso, Elizabeth A Stewart, Richard Ehman, David A Woodrum
RATIONALE AND OBJECTIVES: Magnetic resonance elastography has proven to be a valuable tool in the diagnosis of liver fibrosis, breast and cervical cancer, but its application in uterine fibroids requires further characterization. The aim of the present study was to examine the relationship between uterine fibroid stiffness by MRE and MR imaging characteristics. MATERIALS AND METHODS: An IRB-approved, HIPAA compliant review was performed of prospectively collected pelvic MRI and 2D-MRE data in patients with symptomatic uterine fibroids (N = 102)...
September 26, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28915103/mr-spectroscopy-derived-proton-density-fat-fraction-is-superior-to-controlled-attenuation-parameter-for-detecting-and-grading-hepatic-steatosis
#15
Jurgen Henk Runge, Loek Pieter Smits, Joanne Verheij, Annekatrien Depla, Sjoerd Douwe Kuiken, Bert Cornelis Baak, Aart Johannes Nederveen, Ulrich Beuers, Jaap Stoker
Purpose To prospectively compare the diagnostic accuracy of controlled attenuation parameter (CAP) obtained with transient elastography and proton density fat fraction (PDFF) obtained with proton magnetic resonance (MR) spectroscopy with results of liver biopsy in a cohort of adult patients suspected of having nonalcoholic fatty liver disease (NAFLD). Materials and Methods The institutional review board approved this study. Informed consent was obtained from all patients. The authors evaluated 55 patients suspected of having NAFLD (40 men, 15 women)...
September 15, 2017: Radiology
https://www.readbyqxmd.com/read/28914407/association-of-fetuin-b-with-markers-of-liver-fibrosis-in-nonalcoholic-fatty-liver-disease
#16
Thomas Ebert, Nicolas Linder, Alexander Schaudinn, Harald Busse, Joachim Berger, Ralf Lichtinghagen, Volker Keim, Johannes Wiegand, Thomas Karlas
OBJECTIVE: The liver-derived plasma protein fetuin B is associated with nonalcoholic fatty liver disease (NAFLD) and impaired glucose homeostasis in mice. However, its association with non-invasive ultrasound- and magnetic resonance (MR)-based markers of liver fibrosis and steatosis, the enhanced liver fibrosis (ELF) score, liver biopsy, as well as rs738409 in PNPLA3, has not been elucidated in NAFLD, so far. DESIGN AND METHODS: The association of circulating fetuin B and transient elastography (TE), controlled attenuation parameter (CAP), (1)H-MR-spectroscopy, the ELF score, liver biopsy, as well as risk alleles in rs738409 in PNPLA3, was studied in 101 NAFLD patients as compared to 15 healthy controls...
November 2017: Endocrine
https://www.readbyqxmd.com/read/28866387/static-and-dynamic-liver-stiffness-an-ex-vivo-porcine-liver-study-using-mr-elastography
#17
Chun Yang, Meng Yin, Kevin J Glaser, Xiangyang Zhu, Kai Xu, Richard L Ehman, Jun Chen
Magnetic resonance elastography (MRE) is an MRI-based noninvasive technique for quantitatively assessing tissue stiffness. The hypothesis of this study is that stiffness increases with portal pressure. We further hypothesized that the rate of stiffness change with pressure would be larger in liver tissue treated to simulate the stiffening effects of fibrosis. In agreement with our hypothesis, the formalin-treated livers were stiffer than the untreated livers, and in both groups the liver stiffness increased with portal venous pressure...
December 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28856718/tomoelastography-of-the-native-kidney-regional-variation-and-physiological-effects-on-in-vivo-renal-stiffness
#18
Stephan Rodrigo Marticorena Garcia, Markus Grossmann, Sophia Theresa Lang, Heiko Tzschätzsch, Florian Dittmann, Bernd Hamm, Jürgen Braun, Jing Guo, Ingolf Sack
PURPOSE: To measure normal renal stiffness in adults, taking into account regional variation, hydration, and urinary status. METHODS: Thirty-six healthy volunteers were examined by tomoelastography based on MR elastography at four frequencies, from 40 to 70 Hz and multifrequency shear wave speed recovery. Regional wave speeds were derived for the medulla, cortex (inner cortex and outer cortex), and renal pelvis, and examined for age-related effects. Subgroups were repeatedly examined for reproducibility, amount of prior water drinking, and urinary status...
August 30, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28837671/development-of-acute-hydrocephalus-does-not-change-brain-tissue-mechanical-properties-in-adult-rats-but-in-juvenile-rats
#19
COMPARATIVE STUDY
Alice C Pong, Lauriane Jugé, Lynne E Bilston, Shaokoon Cheng
INTRODUCTION: Regional changes in brain stiffness were previously demonstrated in an experimental obstructive hydrocephalus juvenile rat model. The open cranial sutures in the juvenile rats have influenced brain compression and mechanical properties during hydrocephalus development and the extent by which closed cranial sutures in adult hydrocephalic rat models affect brain stiffness in-vivo remains unclear. The aims of this study were to determine changes in brain tissue mechanical properties and brain structure size during hydrocephalus development in adult rat with fixed cranial volume and how these changes were related to brain tissue deformation...
2017: PloS One
https://www.readbyqxmd.com/read/28801939/assessment-of-advanced-hepatic-mr-elastography-methods-for-susceptibility-artifact-suppression-in-clinical-patients
#20
Jin Wang, Kevin J Glaser, Tianhui Zhang, Qungang Shan, Bingjun He, Jun Chen, Meng Yin, Bogdan Dzyubak, Jennifer L Kugel, Scott A Kruse, Roger C Grimm, Sudhakar K Venkatesh, Richard L Ehman
PURPOSE: To assess the success rate, image quality, and the ability to stage liver fibrosis of a standard 2D gradient-recalled echo (GRE) and four different spin-echo (SE) magnetic resonance elastography (MRE) sequences in patients with different liver iron concentrations. MATERIALS AND METHODS: A total of 332 patients who underwent 3T MRE examinations that included liver fat and iron quantification were enrolled, including 136 patients with all five MRE techniques...
August 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
keyword
keyword
91738
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"