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https://www.readbyqxmd.com/read/29036973/-predictive-value-of-cardiac-magnetic-resonance-derived-parameters-on-the-improvement-of-left-ventricular-function-in-patients-with-acute-viral-myocarditis
#1
H C Ouyang, F C Ouyang, L L Mai, Y Y Chen, Y Z Hu, H X Chen, W S Li
Objective: To evaluate the predictive value of cardiac magnetic resonance (CMR)-derived parameters on the improvement of left ventricular function in patients with acute viral myocarditis. Methods: Forty patients, who referred for acute viral myocarditis in our hospital from September 2011 to September 2015, were prospectively enrolled in this study.All patients were examined by CMR during hospitalization for acute viral myocarditis (baseline) and after 12 months.The CMR sequences include: two dimension steady state free precession, 2D SSFP; triple inversion recovery, triple IR; early gadolinium enhancement; phase sensitive inversion recovery turbo field echo, PSIR TFE...
September 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29030995/magnetic-resonance-elastography-is-as-accurate-as-liver-biopsy-for-liver-fibrosis-staging
#2
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/29029832/tumour-auto-contouring-on-2d-cine-mri-for-locally-advanced-lung-cancer-a-comparative-study
#3
Martin F Fast, Björn Eiben, Martin J Menten, Andreas Wetscherek, David J Hawkes, Jamie R McClelland, Uwe Oelfke
BACKGROUND AND PURPOSE: Radiotherapy guidance based on magnetic resonance imaging (MRI) is currently becoming a clinical reality. Fast 2d cine MRI sequences are expected to increase the precision of radiation delivery by facilitating tumour delineation during treatment. This study compares four auto-contouring algorithms for the task of delineating the primary tumour in six locally advanced (LA) lung cancer patients. MATERIAL AND METHODS: Twenty-two cine MRI sequences were acquired using either a balanced steady-state free precession or a spoiled gradient echo imaging technique...
October 10, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29025406/impact-of-empagliflozin-on-subclinical-left-ventricular-dysfunctions-and-on-the-mechanisms-involved-in-myocardial-disease-progression-in-type-2-diabetes-rationale-and-design-of-the-empa-heart-trial
#4
Andrea Natali, Lorenzo Nesti, Iacopo Fabiani, Enrico Calogero, Vitantonio Di Bello
BACKGROUND: Asymptomatic left ventricular (LV) dysfunction is highly prevalent in type 2 diabetes patients. Unlike the other hypoglycemic drugs, SGLT2 inhibitors have shown potential benefits for reducing cardiovascular death and risk factors, aside from lowering plasma glucose levels. With this study we aim at determining whether the treatment with empagliflozin is associated with an improvement in LV functions in diabetic patients with asymptomatic LV dysfunction against Sitagliptin, which is presumably neutral on myocardial function...
October 12, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/29023976/peripheral-nerve-involvement-in-multiple-sclerosis-demonstration-by-magnetic-resonance-neurography
#5
Johann M E Jende, Gesa H Hauck, Ricarda Diem, Markus Weiler, Sabine Heiland, Brigitte Wildemann, Mirjam Korporal-Kuhnke, Wolfgang Wick, John M Hayes, Johannes Pfaff, Mirko Pham, Martin Bendszus, Jennifer Kollmer
OBJECTIVE: To detect and quantify peripheral nerve lesions in multiple sclerosis (MS) by magnetic resonance neurography (MRN). METHODS: 36 patients diagnosed with MS based on the 2010 McDonald criteria (34 with the relapsing-remitting form, 2 with clinically isolated syndrome) with and without disease modifying treatment were compared to 35 healthy age/sex-matched volunteers. All patients underwent detailed neurological and electrophysiological examinations. 3T MRN with large anatomical coverage of both legs and the lumbosacral plexus was performed by using 2D fat-saturated, T2-weighted and dual echo turbo-spin-echo sequences as well as a 3D T2-weighted, fat-saturated SPACE sequence...
October 10, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28993567/reference-intervals-and-allometric-scaling-of-two-dimensional-echocardiographic-measurements-in-150-healthy-cats
#6
Schober Karsten, Savino Stephanie, Yildiz Vedat
The objective of the study was to evaluate the effects of body weight (BW), breed, and sex on two-dimensional (2D) echocardiographic measures, reference ranges, and prediction intervals using allometrically-scaled data of left atrial (LA) and left ventricular (LV) size and LV wall thickness in healthy cats. Study type was retrospective, observational, and clinical cohort. 150 healthy cats were enrolled and 2D echocardiograms analyzed. LA diameter, LV wall thickness, and LV dimension were quantified using three different imaging views...
October 6, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28987085/communication-broad-manifold-of-excitonic-states-in-light-harvesting-complex-1-promotes-efficient-unidirectional-energy-transfer-in-vivo
#7
Sara H Sohail, Peter D Dahlberg, Marco A Allodi, Sara C Massey, Po-Chieh Ting, Elizabeth C Martin, C Neil Hunter, Gregory S Engel
In photosynthetic organisms, the pigment-protein complexes that comprise the light-harvesting antenna exhibit complex electronic structures and ultrafast dynamics due to the coupling among the chromophores. Here, we present absorptive two-dimensional (2D) electronic spectra from living cultures of the purple bacterium, Rhodobacter sphaeroides, acquired using gradient assisted photon echo spectroscopy. Diagonal slices through the 2D lineshape of the LH1 stimulated emission/ground state bleach feature reveal a resolvable higher energy population within the B875 manifold...
October 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28984733/cartilage-endplate-thickness-variation-measured-by-ultrashort-echo-time-mri-is-associated-with-adjacent-disc-degeneration
#8
Britta Berg-Johansen, Misung Han, Aaron J Fields, Ellen C Liebenberg, Brandon J Lim, Peder Ez Larson, Cigdem Gunduz-Demir, Galateia J Kazakia, Roland Krug, Jeffrey C Lotz
STUDY DESIGN: A magnetic resonance imaging study of human cadaver spines. OBJECTIVE: To investigate associations between cartilage endplate (CEP) thickness and disc degeneration. SUMMARY OF BACKGROUND DATA: Damage to the CEP is associated with spinal injury and back pain. However, CEP morphology and its association with disc degeneration have not been well characterized. METHODS: Ten lumbar motion segments with varying degrees of disc degeneration were harvested from six cadaveric spines and scanned with MRI in the sagittal plane using a T2-weighted 2D sequence, a 3D ultrashort echo-time (UTE) imaging sequence, and a 3D T1ρ mapping sequence...
October 3, 2017: Spine
https://www.readbyqxmd.com/read/28983957/prospective-motion-correction-in-2d-multishot-mri-using-epi-navigators-and-multislice-to-volume-image-registration
#9
Daniel Christopher Hoinkiss, David Andrew Porter
PURPOSE: Prospective motion correction reduces artifacts in MRI by correcting for subject motion in real time, but techniques are limited for multishot 2-dimensional (2D) sequences. This study addresses this limitation by using 2D echo-planar imaging (EPI) slice navigator acquisitions together with a multislice-to-volume image registration. METHODS: The 2D-EPI navigators were integrated into 2D imaging sequences to allow a rapid, real-time motion correction based on the registration of three navigator slices to a reference volume...
October 5, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28983811/value-of-three-dimensional-t2-weighted-turbo-spin-echo-imaging-with-tissue-specific-variable-refocusing-flip-angle-for-3-t-magnetic-resonance-imaging-of-prostate-cancer-comparison-with-conventional-two-and-three-dimensional-t2-weighted-turbo-spin-echo-imaging
#10
Utaru Tanaka, Yoshiko Ueno, Yukiko Morinaga, Hideaki Miyake, Katsusuke Kyotani, Yu Ueda, Kazuhiro Kitajima, Keitaro Sofue, Yuko Suenaga, Kazuro Sugimura, Satoru Takahashi
PURPOSE: To investigate the impact of three-dimensional (3D) T2-weighted turbo spin-echo imaging (TSE-T2WI) with tissue-specific variable refocusing flip angle (TS-VRFA) on image quality and prostate cancer (PCa) detection and extraprostatic extension (EPE) evaluation compared to 2D TSE-T2WI and conventional 3D TSE-T2WI with volume isotropic TSE acquisition (VISTA). MATERIALS AND METHODS: Image data sets of 40 patients who underwent 3-T MRI before prostatectomy, including multiplane 2D T2WI, 3D T2WI with TS-VRFA and VISTA, and diffusion-weighted images were independently evaluated by two radiologists...
October 5, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28980410/the-pediatric-echocardiography-boot-camp-four-year-experience-and-impact-on-clinical-performance
#11
Shiraz A Maskatia, Antonio G Cabrera, Shaine A Morris, Carolyn A Altman
BACKGROUND: We previously reported on the short-term impact of an echocardiography "Boot Camp" on a single class of cardiology fellows (CF). The impact of the Boot Camp on performance throughout fellowship is unknown. METHODS: We enrolled four classes of CFs and two classes of cardiac ICU fellows (CVs) prospectively into the Boot Camp and compared CFs to a historical cohort. Experience with echocardiography was surveyed. Outcome measures included written pre- and post-Camp exams, a performance based test (PBT), self-efficacy assessments, numbers of echocardiograms performed, and echocardiogram quality during the last 3 months of fellowship...
October 2017: Echocardiography
https://www.readbyqxmd.com/read/28980280/renin-angiotensin-system-inhibition-is-associated-with-reduced-risk-of-left-atrial-appendage-thrombosis-formation-in-patients-with-atrial-fibrillation
#12
Ya Suo, Yue Zhang, Yuanyuan Wang, Meng Yuan, Sayuri Kariyawasam, Gary Tse, Tong Liu, Huaying Fu, Guangping Li
BACKGROUND: Inhibition of the renin-angiotensin axis can reduce the likelihood of atrial fibrillation (AF). However, the effects of angiotensin-converting-enzyme inhibitors (ACEIs) or angiotensin II receptor blockers (ARBs) on thrombogenicity in AF remain incompletely elucidated. Thisretrospective case-control study was conducted to evaluate whether the use of ACEI or ARB could reduce the incidence of left atrial appendage thrombus (LAAT) and spontaneous echocardiographic contrast (SEC) in patients with AF...
October 5, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/28952012/comparison-of-a-fast-5-min-knee-mri-protocol-with-a-standard-knee-mri-protocol-a-multi-institutional-multi-reader-study
#13
Erin FitzGerald Alaia, Alex Benedick, Nancy A Obuchowski, Joshua M Polster, Luis S Beltran, Jean Schils, Elisabeth Garwood, Christopher J Burke, I-Yuan Joseph Chang, Soterios Gyftopoulos, Naveen Subhas
PURPOSE: To compare diagnostic performance of a 5-min knee MRI protocol to that of a standard knee MRI. MATERIALS AND METHODS: One hundred 3 T (100 patients, mean 38.8 years) and 50 1.5 T (46 patients, mean 46.4 years) MRIs, consisting of 5 fast, 2D multi-planar fast-spin-echo (FSE) sequences and five standard multiplanar FSE sequences, from two academic centers (1/2015-1/2016), were retrospectively reviewed by four musculoskeletal radiologists. Agreement between fast and standard (interprotocol agreement) and between standard (intraprotocol agreement) readings for meniscal, ligamentous, chondral, and bone pathology was compared for interchangeability...
September 26, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28950883/characterization-of-cardiac-and-respiratory-driven-cerebrospinal-fluid-motion-based-on-asynchronous-phase-contrast-magnetic-resonance-imaging-in-volunteers
#14
Ken Takizawa, Mitsunori Matsumae, Saeko Sunohara, Satoshi Yatsushiro, Kagayaki Kuroda
BACKGROUND: A classification of cardiac- and respiratory-driven components of cerebrospinal fluid (CSF) motion has been demonstrated using echo planar imaging and time-spatial labeling inversion pulse techniques of magnetic resonance imaging (MRI). However, quantitative characterization of the two motion components has not been performed to date. Thus, in this study, the velocities and displacements of the waveforms of the two motions were quantitatively evaluated based on an asynchronous two-dimensional (2D) phase-contrast (PC) method followed by frequency component analysis...
September 27, 2017: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/28950345/marked-respiratory-related-fluctuations-in-left-ventricular-outflow-tract-gradients-in-hypertrophic-obstructive-cardiomyopathy-an-observational-study
#15
Renuka Jain, Martin Osranek, M Fuad Jan, Lindsey R Kalvin, Susan Olet, Suhail Q Allaqaband, Arshad Jahangir, Bijoy K Khandheria, A Jamil Tajik
Aims: Left ventricular outflow (LVOT) obstruction in patients with hypertrophic cardiomyopathy (HCM) is dynamic and sensitive to many variables that affect left ventricular preload, afterload, and contractility. The haemodynamic effect of normal respiration on LVOT obstruction has not been described. Methods and results: We examined 20 patients with HCM who were noted to have phasic respiratory variation of LVOT obstruction on initial transthoracic 2D echocardiogram and Doppler examination...
September 7, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28942616/differences-in-right-ventricular-morphology-not-function-indicate-the-nature-of-increased-afterload-in-pulmonary-hypertensive-subjects-with-normal-left-ventricular-function
#16
Farhan Raza, Catherine Dillane, Arslan Mirza, Yevgeniy Brailovsky, Sheila Weaver, Martin G Keane, Paul Forfia
BACKGROUND: The aim of study was to assess whether a specific morphology of the right ventricle (RV) by 2D echo predicts the hemodynamic nature of pulmonary hypertension (PH). METHODS: We reviewed clinical, 2D echo, and hemodynamic data of 100 patients with PH: divided into three groups: PH from pulmonary vascular disease (PHPVD ; n = 34) with pulmonary vascular resistance (PVR) > 3 mm Hg/L/min (Wood unit [WU]) and pulmonary artery wedge pressure (PAWP) ≤ 15 mm Hg, pulmonary venous hypertension (PVH; n = 33) with PVR < 3 WU and PAWP > 15 mm Hg and PHMIXED (n = 33) with PVR > 3 WU and PAWP > 15 mm Hg...
September 24, 2017: Echocardiography
https://www.readbyqxmd.com/read/28920601/dynamics-of-coherence-localization-and-excitation-transfer-in-disordered-nanorings
#17
Alejandro D Somoza, Ke-Wei Sun, Rafael A Molina, Yang Zhao
Self-assembled supramolecular aggregates are excellent candidates for the design of efficient excitation transport devices. Both artificially prepared and natural photosynthetic aggregates in plants and bacteria present an important degree of disorder that is supposed to hinder excitation transport. Besides, molecular excitations couple to nuclear motion affecting excitation transport in a variety of ways. We present an exhaustive study of exciton dynamics in disordered nanorings with long-range interactions under the influence of a phonon bath taking the LH2 system of purple bacteria as a model...
October 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28905414/high-spatio-temporal-resolution-in-functional-mri-with-3d-echo-planar-imaging-using-cylindrical-excitation-and-a-caipirinha-undersampling-pattern
#18
Wietske van der Zwaag, Olivier Reynaud, Mayur Narsude, Daniel Gallichan, José P Marques
PURPOSE: The combination of 3D echo planar imaging (3D-EPI) with a 2D-CAIPIRINHA undersampling scheme provides high flexibility in the optimization for spatial or temporal resolution. This flexibility can be increased further with the addition of a cylindrical excitation pulse, which exclusively excites the brain regions of interest. Here, 3D-EPI was combined with a 2D radiofrequency pulse to reduce the brain area from which signal is generated, and hence, allowing either reduction of the field of view or reduction of parallel imaging noise amplification...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28899347/case-report-of-hyperglycemic-nonketotic-chorea-with-rapid-radiological-resolution
#19
H M M T B Herath, S P Pahalagamage, Sunethra Senanayake
BACKGROUND: Hemichorea is a rare manifestation of nonketotic hyperglycemia that usually affects elderly Asian women with poor glycemic control. Non-contrast computerized Tomography and T1- weighted Magnetic Resonance Imaging shows characteristic hyperintense basal ganglia lesions. CASE PRESENTATION: A Fifty-seven year old Sri Lankan female presented with a two-day history of right upper limb chorea. She had been diagnosed with diabetes mellitus one year ago, but was not on any treatment and did not have any micro vascular or macro vascular complications...
September 12, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28893651/obstructive-sleep-apnea-is-associated-with-altered-midbrain-chemical-concentrations
#20
Paul M Macey, Manoj K Sarma, Janani P Prasad, Jennifer A Ogren, Ravi Aysola, Ronald M Harper, M Albert Thomas
Obstructive sleep apnea (OSA) is accompanied by altered structure and function in cortical, limbic, brainstem, and cerebellar regions. The midbrain is relatively unexamined, but contains many integrative nuclei which mediate physiological functions that are disrupted in OSA. We therefore assessed the chemistry of the midbrain in OSA in this exploratory study. We used a recently developed accelerated 2D magnetic resonance spectroscopy (2D-MRS) technique, compressed sensing-based 4D echo-planar J-resolved spectroscopic imaging (4D-EP-JRESI), to measure metabolites in the midbrain of 14 OSA (mean age±SD:54...
November 5, 2017: Neuroscience
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