keyword
MENU ▼
Read by QxMD icon Read
search

t1-mapping

keyword
https://www.readbyqxmd.com/read/27904982/magnetic-resonance-evaluation-of-cardiac-thrombi-and-masses-by-t1-and-t2-mapping-an-observational-study
#1
Thibault Caspar, Soraya El Ghannudi, Mickaël Ohana, Aïssam Labani, Aubrietia Lawson, Patrick Ohlmann, Olivier Morel, Michel De Mathelin, Catherine Roy, Afshin Gangi, Philippe Germain
The purpose of this work was to evaluate CMR T1 and T2 mapping sequences in patients with intracardiac thrombi and masses in order to assess T1 and T2 relaxometry usefulness and to allow better etiological diagnosis. This observational study of patients scheduled for routine CMR was performed from September 2014 to August 2015. All patients referred to our department for a 1.5 T CMR were screened to participate. T1 mapping were acquired before and after Gadolinium injection; T2 mapping images were obtained before injection...
December 1, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27899132/cardiac-t1-mapping-and-extracellular-volume-ecv-in-clinical-practice-a-comprehensive-review
#2
REVIEW
Philip Haaf, Pankaj Garg, Daniel R Messroghli, David A Broadbent, John P Greenwood, Sven Plein
Cardiovascular Magnetic Resonance is increasingly used to differentiate the aetiology of cardiomyopathies. Late Gadolinium Enhancement (LGE) is the reference standard for non-invasive imaging of myocardial scar and focal fibrosis and is valuable in the differential diagnosis of ischaemic versus non-ischaemic cardiomyopathy. Diffuse fibrosis may go undetected on LGE imaging. Tissue characterisation with parametric mapping methods has the potential to detect and quantify both focal and diffuse alterations in myocardial structure not assessable by LGE...
November 30, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27893386/optimizing-mr-scan-design-for-model-based-t1-t2-estimation-from-steady-state-sequences
#3
Gopal Nataraj, Jon-Fredrick Nielsen, Jeffrey Fessler
Rapid, reliable quantification of MR relaxation parameters T1 and T2 is desirable for many clinical applications. Steady-state sequences such as Spoiled Gradient-Recalled Echo (SPGR) and Dual-Echo Steady-State (DESS) are fast and wellsuited for relaxometry because the signals they produce are quite sensitive to T1 and T2 variation. However, T1, T2 estimation with these sequences typically requires multiple scans with varied sets of acquisition parameters. This paper describes a systematic framework for selecting scan types (e...
October 4, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27891815/quantitative-t1-mapping-detects-cloudy-enhancing-tumor-compartments-predicting-outcome-of-patients-with-glioblastoma
#4
Andreas Müller, Alina Jurcoane, Sied Kebir, Philip Ditter, Felix Schrader, Ulrich Herrlinger, Theophilos Tzaridis, Burkhard Mädler, Hans H Schild, Martin Glas, Elke Hattingen
Contrast enhancement of glioblastomas (GBM) is caused by the decrease in relaxation time, T1. Here, we demonstrate that the quantitative measurement of T1 (qT1) discovers a subtle enhancement in GBM patients that is invisible in standard MRI. We assessed the volume change of this "cloudy" enhancement during radio-chemotherapy and its impact on patients' progression-free survival (PFS). We enrolled 18 GBM patients in this observational, prospective cohort study and measured 3T-MRI pre- and post contrast agent with standard T1-weighted (T1w) and with sequences to quantify T1 before radiation, and at 6-week intervals during radio-chemotherapy...
November 28, 2016: Cancer Medicine
https://www.readbyqxmd.com/read/27889652/cloud-gpu-based-simulations-for-squaremr
#5
George Kantasis, Christos G Xanthis, Kostas Haris, Einar Heiberg, Anthony H Aletras
Quantitative Magnetic Resonance Imaging (MRI) is a research tool, used more and more in clinical practice, as it provides objective information with respect to the tissues being imaged. Pixel-wise T1 quantification (T1 mapping) of the myocardium is one such application with diagnostic significance. A number of mapping sequences have been developed for myocardial T1 mapping with a wide range in terms of measurement accuracy and precision. Furthermore, measurement results obtained with these pulse sequences are affected by errors introduced by the particular acquisition parameters used...
November 17, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27889621/identifying-non-toxic-doses-of-manganese-for-manganese-enhanced-magnetic-resonance-imaging-to-map-brain-areas-activated-by-operant-behavior-in-trained-rats
#6
Rita Gálosi, Csaba Szalay, Mihály Aradi, Gábor Perlaki, József Pál, Roy Steier, László Lénárd, Zoltán Karádi
Manganese-enhanced magnetic resonance imaging (MEMRI) offers unique advantages such as studying brain activation in freely moving rats, but its usefulness has not been previously evaluated during operant behavior training. Manganese in a form of MnCl2, at a dose of 20mg/kg, was intraperitoneally infused. The administration was repeated and separated by 24h to reach the dose of 40mg/kg or 60mg/kg, respectively. Hepatotoxicity of the MnCl2 was evaluated by determining serum aspartate aminotransferase, alanine aminotransferase, total bilirubin, albumin and protein levels...
November 23, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27886558/optimization-of-sparse-phase-encodings-for-variable-repetition-delay-turbo-spin-echo-tse-t1-measurements-for-preclinical-applications
#7
DongKyu Lee, Sohyun Han, HyungJoon Cho
A variable repetition-delay (TR) spin echo sequence with repeated refocusing pulses, i.e., a variable TR turbo-spin echo (TSE), provides an attractive means of acquiring an accurate T1 map information that is free from gradient echo based artifacts such as magnetic field inhomogeneities particularly for ultra-high field (at 7T and above) preclinical applications. However, the applicability of multi-slice TSE sequences is often limited by signal distortion from T2 relaxation due to echo-train acquisitions for short T2 tissues, inter-slice cross talks and magnetization transfer (MT) from repetitive slice-selective 180° pulse, and extended scan times with multiple TR excitations...
November 10, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27878700/performance-of-native-and-contrast-enhanced-t1-mapping-to-detect-myocardial-damage-in-patients-with-suspected-myocarditis-a-head-to-head-comparison-of-different-cardiovascular-magnetic-resonance-techniques
#8
Jonathan Nadjiri, Hanna Nieberler, Eva Hendrich, Andreas Greiser, Albrecht Will, Stefan Martinoff, Martin Hadamitzky
Myocardial T1 mapping is a novel technique that has proven to be superior to standard imaging for differentiation between healthy individuals in acute myocarditis. Aim of this study was comparison of T1 mapping with a clinical biomarker. We retrospectively investigated 171 patients undergoing cardiovascular magnetic resonance (CMR) examination with suspected myocarditis by performing native and contrast enhanced T1-mapping. Additionally, T2w and T1w images and late gadolinium enhancement sequences (LGE) were utilized for myocardial evaluation; Lake Louise Criteria comprise T1w, T2w and LGE imaging in a score...
November 23, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27862590/hepatic-gadoxetic-acid-uptake-as-a-measure-of-diffuse-liver-disease-where-are-we
#9
REVIEW
Ahmed Ba-Ssalamah, Nina Bastati, Andreas Wibmer, Romana Fragner, Jacqueline C Hodge, Michael Trauner, Christian J Herold, Mustafa R Bashir, Bernard E Van Beers
: MRI has emerged as the most comprehensive noninvasive diagnostic tool for focal liver lesions and diffuse hepatobiliary disorders. The introduction of hepatobiliary contrast agents, most notably gadoxetic acid (GA), has expanded the role of MRI, particularly in the functional imaging of chronic liver diseases, such as nonalcoholic fatty liver disease (NAFLD). GA-enhanced MRI (GA-MRI) may help to distinguish between the two subgroups of NAFLD, simple steatosis and nonalcoholic steatohepatitis...
November 8, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27855705/myocardial-t1-mapping-at-3t-using-saturation-recovery-reference-values-precision-and-comparison-with-molli
#10
Sebastian Weingärtner, Nadja M Meßner, Johannes Budjan, Dirk Loßnitzer, Uwe Mattler, Theano Papavassiliu, Frank G Zöllner, Lothar R Schad
BACKGROUND: Myocardial T1-mapping recently emerged as a promising quantitative method for non-invasive tissue characterization in numerous cardiomyopathies. Commonly performed with an inversion-recovery (IR) magnetization preparation at 1.5T, the application at 3T has gained due to increased quantification precision. Alternatively, saturation-recovery (SR) T1-mapping has recently been introduced at 1.5T for improved accuracy. Thus, the purpose of this study is to investigate the robustness and precision of SR T1-mapping at 3T and to establish accurate reference values for native T1-times and extracellular volume fraction (ECV) of healthy myocardium...
November 18, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27852696/insights-into-cardiac-involvement-in-ankylosing-spondylitis-from-cardiovascular-magnetic-resonance
#11
P Stefan Biesbroek, Sjoerd C Heslinga, Thelma C Konings, Irene E van der Horst-Bruinsma, Mark B M Hofman, Peter M van de Ven, Otto Kamp, Vokko P van Halm, Mike J L Peters, Yvo M Smulders, Albert C van Rossum, Mike T Nurmohamed, Robin Nijveldt
OBJECTIVE: To evaluate cardiac involvement in patients with ankylosing spondylitis using cardiac magnetic resonance (CMR). METHODS: Patients with ankylosing spondylitis without cardiovascular symptoms or known cardiovascular disease were screened by transthoracic echocardiography (TTE) for participation in this exploratory CMR study. We prospectively enrolled 15 ankylosing spondylitis patients with an abnormal TTE for further tissue characterisation using late gadolinium enhancement (LGE) and T1 mapping...
November 16, 2016: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/27846845/relationship-between-native-papillary-muscle-t1-time-and-severity-of-functional-mitral-regurgitation-in-patients-with-non-ischemic-dilated-cardiomyopathy
#12
Shingo Kato, Shiro Nakamori, Sébastien Roujol, Francesca N Delling, Shadi Akhtari, Jihye Jang, Tamer Basha, Sophie Berg, Kraig V Kissinger, Beth Goddu, Warren J Manning, Reza Nezafat
BACKGROUND: Functional mitral regurgitation is one of the severe complications of non-ischemic dilated cardiomyopathy (DCM). Non-contrast native T1 mapping has emerged as a non-invasive method to evaluate myocardial fibrosis. We sought to evaluate the potential relationship between papillary muscle T1 time and mitral regurgitation in DCM patients. METHODS: Forty DCM patients (55 ± 13 years) and 20 healthy adult control subjects (54 ± 13 years) were studied...
November 16, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27826352/native-t1-mapping-demonstrating-apical-thrombi-in-eosinophilic-myocarditis-associated-with-churg-strauss-syndrome
#13
Kyongmin Sarah Beck, Soh Yong Jeong, Kyo Young Lee, Kiyuk Chang, Jung Im Jung
Eosinophilic myocarditis is a disease characterized by eosinophilic infiltration of the myocardium, consisting of acute necrotic stage, thrombotic stage, and fibrotic stage. Although T1 mapping has been increasingly used in various cardiac pathologies, there has been no report of T1 mapping in eosinophilic myocarditis. We report a case of 75-year-old female with eosinophilic myocarditis, whose cardiac magnetic resonance imaging included native T1 mapping, in which apical thrombi were distinctly seen as areas with decreased T1 values, next to areas of inflammation seen as increased T1 value in subendocardium...
November 2016: Korean Circulation Journal
https://www.readbyqxmd.com/read/27817748/dark-blood-late-enhancement-imaging
#14
Peter Kellman, Hui Xue, Laura J Olivieri, Russell R Cross, Elena K Grant, Marianna Fontana, Martin Ugander, James C Moon, Michael S Hansen
BACKGROUND: Bright blood late gadolinium enhancement (LGE) imaging typically achieves excellent contrast between infarcted and normal myocardium. However, the contrast between the myocardial infarction (MI) and the blood pool is frequently suboptimal. A large fraction of infarctions caused by coronary artery disease are sub-endocardial and thus adjacent to the blood pool. It is not infrequent that sub-endocardial MIs are difficult to detect or clearly delineate. METHODS: In this present work, an inversion recovery (IR) T2 preparation was combined with single shot steady state free precession imaging and respiratory motion corrected averaging to achieve dark blood LGE images with good signal to noise ratio while maintaining the desired spatial and temporal resolution...
November 7, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27809867/coronary-microvascular-function-and-myocardial-fibrosis-in-women-with-angina-pectoris-and-no-obstructive-coronary-artery-disease-the-ipower-study
#15
Naja Dam Mygind, Marie Mide Michelsen, Adam Pena, Abbas Ali Qayyum, Daria Frestad, Thomas Emil Christensen, Adam Ali Ghotbi, Nynne Dose, Rebekka Faber, Niels Vejlstrup, Philip Hasbak, Andreas Kjaer, Eva Prescott, Jens Kastrup
BACKGROUND: Even in absence of obstructive coronary artery disease women with angina pectoris have a poor prognosis possibly due to coronary microvascular disease. Coronary microvascular disease can be assessed by transthoracic Doppler echocardiography measuring coronary flow velocity reserve (CFVR) and by positron emission tomography measuring myocardial blood flow reserve (MBFR). Diffuse myocardial fibrosis can be assessed by cardiovascular magnetic resonance (CMR) T1 mapping. We hypothesized that coronary microvascular disease is associated with diffuse myocardial fibrosis...
November 4, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27799574/segment-by-segment-assessment-of-left-ventricular-myocardial-affection-in-anderson-fabry-disease-by-non-enhanced-t1-mapping
#16
Thula C Walter, Gesine Knobloch, Sima Canaan-Kuehl, Andreas Greiser, Anja Sandek, Daniela Blaschke, Timm Denecke, Bernd Hamm, Marcus R Makowski
BACKGROUND: Anderson-Fabry disease (AFD) is an X-linked lysosomal enzyme disorder associated with an intracellular accumulation of sphingolipids, which shorten myocardial T1 relaxation times. Myocardial affection, however, varies between different segments. PURPOSE: To evaluate the specific segmental distribution and degree of segmental affection in AFD patients. MATERIAL AND METHODS: Twenty-five patients with AFD, 14 patients with hypertrophic cardiomyopathy (HCM), and 21 controls were included...
October 31, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27794025/effect-of-contrast-dose-in-the-quantification-of-myocardial-extra-cellular-volume-in-adenosine-stress-rest-perfusion-cardiac-magnetic-resonance-examinations
#17
Meylin Caballeros, Pablo Bartolomé, Óscar Fernández González, Andreas Greiser, Loreto García Del Barrio, Jesús Pueyo, Gorka Bastarrika
BACKGROUND: Diffuse myocardial fibrosis can be quantified by calculating extra-cellular volume (ECV) from native and post-contrast T1 values using dedicated single bolus contrast medium injection protocols. PURPOSE: To evaluate differences in T1 maps and myocardial ECV measurements in routine stress/rest perfusion cardiovascular magnetic resonance (CMR) examinations after injection of single and double dose of contrast medium. MATERIAL AND METHODS: Thirty-seven consecutive patients (30 men; mean age, 62 ± 13 years) underwent clinically indicated adenosine stress/rest perfusion CMR examination to rule out myocardial ischemia following a conventional split-dose contrast medium injection strategy...
October 28, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27793097/myocardial-lipid-content-in-fabry-disease-a-combined-1-h-mr-spectroscopy-and-mr-imaging-study-at-3-tesla
#18
B Petritsch, H Köstler, A M Weng, M Horn, T Gassenmaier, A S Kunz, F Weidemann, C Wanner, T A Bley, M Beer
BACKGROUND: Fabry disease is characterized by a progressive deposition of sphingolipids in different organ systems, whereby cardiac involvement leads to death. We hypothesize that lysosomal storage of sphingolipids in the heart as occurring in Fabry disease does not reflect in higher cardiac lipid concentrations detectable by (1)H magnetic resonance spectroscopy (MRS) at 3 Tesla. METHODS: Myocardial lipid content was quantified in vivo by (1)H-MRS in 30 patients (12 male, 18 female; 18 patients treated with enzyme replacement therapy) with genetically proven Fabry disease and in 30 healthy controls...
October 28, 2016: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/27785679/the-evaluation-of-non-ischemic-dilated-cardiomyopathy-with-t1-mapping-and-ecv-methods-using-3t-cardiac-mri
#19
Cemile Ayşe Görmeli, Zeynep Maraş Özdemir, Ayşegül Sağır Kahraman, Jülide Yağmur, Ramazan Özdemir, Cemil Çolak
PURPOSE: The aim of this study was to examine the correlation between ventricular function and the extracellular volume fraction (ECV) in patients with non-ischemic dilated cardiomyopathy (NIDCM) using 3.0 T magnetic resonance imaging (MRI). We also hypothesized that native T1 and ECV values would be increased in patients with NIDCM, independent of the left ventricular ejection fraction (LVEF). The findings of our study could lead to further studies of the follow-up protocols. MATERIALS AND METHODS: In total, 53 consecutive dilated cardiomyopathy patients who had undergone cardiac MRI were functionally evaluated and underwent tissue characterization...
October 27, 2016: La Radiologia Medica
https://www.readbyqxmd.com/read/27776667/dynamic-contrast-enhanced-case-control-analysis-in-3t-mri-of-prostate-cancer-can-help-to-characterize-tumor-aggressiveness
#20
Roberto Sanz-Requena, Luis Martí-Bonmatí, Rosario Pérez-Martínez, Gracián García-Martí
PURPOSE: The aim of this work is to establish normality and tumor tissue ranges for perfusion parameters from dynamic contrast-enhanced (DCE) MR of the peripheral prostate at 3T and to compare the diagnostic performance of quantitative and semi-quantitative parameters. MATERIALS AND METHODS: Thirty-six patients with prostate carcinomas (18 Gleason-6, 15 Gleason-7, and 3 Gleason-8) and 33 healthy subjects were included. Image analysis workflow comprised four steps: manual segmentation of whole prostate and lesions, series registration, voxelwise T1 mapping and calculation of pharmacokinetic and semi-quantitative parameters...
November 2016: European Journal of Radiology
keyword
keyword
39803
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"