22 papers · ranked by Valyu relevance
Shivraman Giri, Yiu-Cho Chung, Ali Merchant, Georgeta Mihai + 3 more
'Sanjay Rajagopalan' 'Subha V Raman' 'Orlando P Simonetti'] Background T2-Weighted (T2W) magnetic resonance imaging (MRI) pulse sequences have been used to detect edema in patients with acute myocardial infarction and differentiate acute from chronic infarction. T2W sequences have suffered from several problems…
Aaron T. O’Brien, Katarzyna E. Gil, Juliet Varghese, Orlando P. Simonetti + 1 more
'Orlando P. Simonetti' 'Karolina M. Zareba'] Cardiovascular magnetic resonance (CMR) is considered the gold standard imaging modality for myocardial tissue characterization. Elevated transverse relaxation time (T2) is specific for increased myocardial water content, increased free water, and is used as an index of…
A.S. Lota, P.D. Gatehouse, R.H. Mohiaddin
Cardiovascular magnetic resonance (CMR) is a versatile imaging modality that enables aetiological assessment and provides additional information to that of standard echocardiography in a significant proportion of patients with heart failure. In addition to highly accurate and reproducible assessment of ventricular…
Pei, Haoyang, Shepherd, Timothy M. + 10 more
- 1 Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University Grossman School of Medicine, New York, NY, USA. - 2 Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University Grossman School of Medicine, USA - 3 Department of…
Daniel R Messroghli, Andre Rudolph, Hassan Abdel-Aty, Ralf Wassmuth + 3 more
'Titus Kühne' 'Rainer Dietz' 'Jeanette Schulz-Menger'] Background In magnetic resonance (MR) imaging, T1, T2 and T2* relaxation times represent characteristic tissue properties that can be quantified with the help of specific imaging strategies. While there are basic software tools for specific pulse sequences, until…
Alexander J. Daniel, Susan T. Francis
SE-EPI T2-mapping used a widely available vendor-provided sequence. It comprises a 90° excitation pulse followed by a 180° RF pulse after time TE/2, with a single echo formed at time TE; here, this is sampled using an EPI readout. Repeats of the single echo SE-EPI are then collected at different TEs to sample the T2…
Mengxue Zhang, Qingrui Cai, Yinyin Chen, Hang Jin + 12 more
Physics-Informed Neural Networks (PINN) are emerging as a promising approach for quantitative parameter estimation of Magnetic Resonance Imaging (MRI). While existing deep learning methods can provide an accurate quantitative estimation of the T 2 parameter, they still require large amounts of training data and lack…
Congbo Cai, Yiqing Zeng, Chao Wang, Shuhui Cai + 4 more
'Zhong Chen' 'Xinghao Ding' 'Jianhui Zhong'] Methods: The training dataset was obtained from simulations carried out on SPROM software developed by our group. The relationship between the original OLED image containing two echo signals and the corresponded T2 mapping was learned by ResNet training. After the ResNet was…
Charlotta Jarkman, Carl-Johan Carlhäll, Markus Henningsson
The Multimapping technique was recently proposed for simultaneous myocardial T_1_ and T_2_ mapping. In this study we evaluate its correlation with clinical reference mapping techniques in patients with a range of cardiovascular diseases (CVD), compare image quality and inter- and intra-observer repeatability.…
Gizeaddis Lamesgin Simegn, Borjan Gagoski, Yulu Song, Douglas C. Dean + 10 more
Relaxometry, specifically T_1_ and T_2_ mapping, has become an essential technique for assessing the properties of biological tissues related to various physiological and pathological conditions. Many techniques are being used to estimate T_1_ and T_2_ relaxation times, ranging from the traditional inversion or…
Markus Henningsson
Methods: The proposed technique (Multimapping) consisted of single-shot Cartesian image acquisitions in 10 consecutive cardiac cycles, with inversion pulses in cycle 1 and 5, and T2 preparation (TE: 30ms, 50ms and 70ms) in cycles 8-10. Multimapping was simulated for different T1 and T2, where entries corresponding to…
Chen, Yuting, Jun, Yohan + 18 more
- 1. State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China - 2. Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts, USA - 3. Department of Radiology, Harvard Medical School…
Matthew F. Glasser, Timothy S. Coalson, Michael P. Harms, Graham L. Baum + 8 more
T1-weighted divided by T2-weighted (T1w/T2w) myelin maps were initially developed for neuroanatomical analyses such as identifying cortical areas, but they are increasingly used in statistical comparisons across individuals and groups with other variables of interest. Existing T1w/T2w myelin maps contain residual…
Jing Rong, Yujie Zhu, Kun Zhu, Min Shao + 3 more
To explore the potential of T1 and T2 mappings in assessing liver fibrosis (LF) and investigate the relationships between MRI and liver fibrogenesis markers. Materials and methods A total of 39 male C57BL/6 mice were divided into the control group (n = 9) and the model group (n = 10 per subgroup) with carbon…
Jorge Campos Pazmiño, Marc‐Antoine Fortin, Véronique Fortier, Evan McNabb + 3 more
Theory and Methods: 1 and 1 were calculated with fat-specific and water-specific MP2RAGE signals. 2 ∗ and PDFF maps were obtained from fat-water separation applied to the second RAGE block. Sequence parameters optimization was performed via Cramér-Rao lower bounds theory, and we designed four protocols with different…
Mahesh Keerthivasan, Ali Bilgin, María I. Altbach
T2-weighted (T2w) MRI is key in abdominal imaging and used in the characterization of a variety of pathologies. T2-weighted imaging is particularly important in the characterization of hemangiomas and cysts, the most common benign liver lesions; these benign lesions are hyperintense compared to liver with distinct…
Lenno Ruijters, Torben Ellegaard Lund, Mads Sloth Vinding
Regarding in vivo, robust R_1_-mapping, the goal of the present paper is twofold. First, to verify that non-bijective mapping in MP2RAGE imaging can be resolved through a 2D look-up-table approach. Second, that the expanded parameter space from this can be used to improve B_1_^+^-inhomogeneity tolerance without other…
Madeleine Leger, Jiangfeng Guo, Mason Lawrence, Bryce MacMillan + 2 more
Despite the increased use of mechanochemistry for chemical reactions few options for reaction monitoring or solid state analysis are available. This work explores using T1 T2 1H NMR to monitor the reaction between benzil or 4,4’ dimethybenzil with o phenylenediamine. For both reactions, the T1 T2 correlation plots show…
Tao Wang, Abhishek Kumar Gupta, David Cordes, Alexandra Slawin + 1 more
The S1 state and high-lying triplet excited states (𝚫ES1Tn) offers insight into clarifying the mechanism of efficiency roll-off of organic light-emitting diodes (OLEDs). However, experimental detection of the 𝚫ES1Tn is challenging due to Kasha’s rule. Here, we report two emitters, PhCz-O-DiKTa and PhCz-DiKTa, showing…
Authors not listed
Chemical reactions are regarded as transformations of chemical structures, and the question of which atoms in the reactants correspond to which atoms in the products has attracted chemists for a long time. Atom-to-atom mapping (AAM) is a procedure that establishes such correspondence(s) between the atoms of reactants…
Madeleine Leger, Jiangfeng Guo, Bryce MacMillan, Hatem Titi + 3 more
We present a new methodology for real-time observation of mechanochemical transformations, based on a magnetic resonance method in which T1-T2 relaxation time correlation maps are used to track the formation of the popular metal-organic framework (MOF) materials Zn-MOF-74 and ZIF-8. This two-dimensional (2D) relaxation…
Benjamin Ries, Irfan Alibay, David W H Swenson, Hannah M Baumann + 3 more
Relative binding free energy (RBFE) calculations have emerged as a powerful tool supporting ligand optimization in drug discovery. Despite many successes, the use of RBFEs can often be limited by automation problems, in particular the setup of such calculations. Atom mapping algorithms are an essential component in…