scholarly journals Myocarditis: imaging up to date

2020 ◽  
Vol 125 (11) ◽  
pp. 1124-1134
Author(s):  
Carlo Liguori ◽  
Davide Farina ◽  
Filippo Vaccher ◽  
Giovanni Ferrandino ◽  
Davide Bellini ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Clinical Practice ◽  
Mr Imaging ◽  
Gold Standard ◽  
Acute Myocarditis ◽  
Myocardial Edema ◽  
T2 Relaxation Time ◽  
T2 Relaxation ◽  
Cardiac Mr

Abstract Myocarditis is an inflammatory disease of the heart muscle, diagnosed by histological, immunological, and immunohistochemical criteria. Endomyocardial biopsy represents the diagnostic gold standard for its diagnosis but is infrequently used. Due to its noninvasive ability to detect the presence of myocardial edema, hyperemia and necrosis/fibrosis, Cardiac MR imaging is routinely used in the clinical practice for the diagnosis of acute myocarditis. Recently pixel-wise mapping of T1 and T2 relaxation time have been introduced into the clinical Cardiac MR protocol increasing its accuracy. Our paper will review the role of MR imaging in the diagnosis of acute myocarditis.

scholarly journals T2 Relaxation Time of Cartilage at MR Imaging: Comparison with Severity of Knee Osteoarthritis

Radiology ◽  
2004 ◽  
Vol 232 (2) ◽  
pp. 592-598 ◽  
Author(s):  
Timothy C. Dunn ◽  
Ying Lu ◽  
Hua Jin ◽  
Michael D. Ries ◽  
Sharmila Majumdar
Keyword(s):  
Relaxation Time ◽  
Mr Imaging ◽  
Knee Osteoarthritis ◽  
T2 Relaxation Time ◽  
T2 Relaxation

Proton MR Spectroscopy and MR Imaging in Acute and Chronic Multiple Sclerosis — Ringlike Appearances in Acute Plaques

1996 ◽  
Vol 37 (1P1) ◽  
pp. 278-287 ◽  
Author(s):  
A.-M. Landtblom ◽  
L. Sjöqvist ◽  
B. Söderfeldt ◽  
H. Nyland ◽  
K.-Å. Thuomas
Keyword(s):  
Multiple Sclerosis ◽  
Relaxation Time ◽  
Mr Imaging ◽  
Brain Lesions ◽  
T2 Relaxation Time ◽  
Healthy Individuals ◽  
T2 Relaxation ◽  
Proton Mrs ◽  
Proton Mr Spectroscopy ◽  
The Core

Purpose: We wanted to compare the metabolite status of brain lesions in different clinical subtypes of multiple sclerosis (MS). Two acute MS lesions with ringlike appearances were also investigated. Material and Methods: Twenty-three clinically stable MS patients, 2 patients with acute relapses, and 15 healthy individuals were examined by MR imaging and localized proton MRS. Results: No metabolite differences were seen in plaques of different subtypes. Decreased NAA/Cr and NAA/choline ratios as well as increased inositol/Cr ratios were observed in the plaques of the clinically stable or chronic active MS patients as compared with controls. The ring plaques had hyperintense cores with surrounding halos, separated from the cores by rings with low signal intensity in T2-weighted images. The core exhibited a prolonged T2 relaxation time. Proton spectra initially contained lactate. Conclusion: No differences between the metabolite status of nonacute plaques in different clinical subtypes could be detected. The ring plaques contained lactate signals indicating oedema, inflammation, and macrophage invasion, and may be transition forms between acute oedematous lesions and chronic demyelinated plaques.

scholarly journals Role of quantitative analysis of T2 relaxation time in differentiating benign from malignant breast lesions

2018 ◽  
Vol 46 (5) ◽  
pp. 1928-1935 ◽  
Author(s):  
Li Liu ◽  
Bo Yin ◽  
Kawai Shek ◽  
Daoying Geng ◽  
Yiping Lu ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Relaxation Time ◽  
Quantitative Analysis ◽  
Breast Lesions ◽  
T2 Relaxation Time ◽  
T2 Relaxation ◽  
Malignant Breast ◽  
Mri Diagnosis ◽  
Malignant Lesions

Objective To investigate the role of quantitative analysis of T2 relaxation time in the magnetic resonance imaging (MRI) diagnosis of breast cancer. Methods The study enrolled patients with clinical breast masses who were examined using MRI at eight different echo times. The differences in T2 relaxation time of benign and malignant breast lesions were analysed. Results A total of 67 patients (67 breast lesions: 46 malignant, 21 benign) were examined. The mean ± SD T2 relaxation time was significantly lower in the 46 malignant lesions compared with the 21 benign lesions (82.69 ± 15.37 ms versus 95.48 ± 26.51 ms, respectively). The area under the curve was 0.731. Using 79.52 ms as the cut-off between benign and malignant breast lesions, a sensitivity of 85.7% and a specificity of 58.7% were obtained. Conclusions There was a significant difference in T2 relaxation time between benign and malignant breast lesions. The specificity of using T2 relaxation time alone for the differentiation of benign from malignant lesions was not high, but it could constitute a new adjunct in the MRI diagnosis of breast cancer.

Mapping T2 Relaxation Time in the Pediatric Knee: Feasibility with a Clinical 1.5-T MR Imaging System

Radiology ◽  
2002 ◽  
Vol 225 (1) ◽  
pp. 233-239 ◽  
Author(s):  
Bernard J. Dardzinski ◽  
Tal Laor ◽  
Vincent J. Schmithorst ◽  
Lance Klosterman ◽  
T. Brent Graham
Keyword(s):  
Relaxation Time ◽  
Mr Imaging ◽  
Imaging System ◽  
T2 Relaxation Time ◽  
T2 Relaxation ◽  
Pediatric Knee

scholarly journals T1 and T2∗ relaxation time in the parcellated myocardium of healthy Taiwanese participants: A single center study

2020 ◽  
Author(s):  
Chih-Chien Tsai ◽  
Shu-Hang Ng ◽  
Yao-Liang Chen ◽  
Yu-Hsiang Juan ◽  
Chao-Hung Wang ◽  
...  
Keyword(s):  
Relaxation Time ◽  
T2 Relaxation Time ◽  
Single Center ◽  
T2 Relaxation ◽  
Single Center Study ◽  
T1 And T2 ◽  
Center Study

Textural and pore size analysis of carbonates from integrated core and nuclear magnetic resonance logging: An Arbuckle study

2015 ◽  
Vol 3 (1) ◽  
pp. SA77-SA89 ◽  
Author(s):  
John Doveton ◽  
Lynn Watney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Pore Size ◽  
Relaxation Times ◽  
T2 Relaxation Time ◽  
T2 Relaxation ◽  
Nmr Logging ◽  
The Core ◽  
Nuclear Magnetic

The T2 relaxation times recorded by nuclear magnetic resonance (NMR) logging are measures of the ratio of the internal surface area to volume of the formation pore system. Although standard porosity logs are restricted to estimating the volume, the NMR log partitions the pore space as a spectrum of pore sizes. These logs have great potential to elucidate carbonate sequences, which can have single, double, or triple porosity systems and whose pores have a wide variety of sizes and shapes. Continuous coring and NMR logging was made of the Cambro-Ordovician Arbuckle saline aquifer in a proposed CO2 injection well in southern Kansas. The large data set gave a rare opportunity to compare the core textural descriptions to NMR T2 relaxation time signatures over an extensive interval. Geochemical logs provided useful elemental information to assess the potential role of paramagnetic components that affect surface relaxivity. Principal component analysis of the T2 relaxation time subdivided the spectrum into five distinctive pore-size classes. When the T2 distribution was allocated between grainstones, packstones, and mudstones, the interparticle porosity component of the spectrum takes a bimodal form that marks a distinction between grain-supported and mud-supported texture. This discrimination was also reflected by the computed gamma-ray log, which recorded contributions from potassium and thorium and therefore assessed clay content reflected by fast relaxation times. A megaporosity class was equated with T2 relaxation times summed from 1024 to 2048 ms bins, and the volumetric curve compared favorably with variation over a range of vug sizes observed in the core. The complementary link between grain textures and pore textures was fruitful in the development of geomodels that integrates geologic core observations with petrophysical log measurements.

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