What is the Most Sensitive Cardiac Magnetic Resonance Technique for Evaluating Myocardial Function? Evaluation in an Aortic Stenosis and Control Cohort

2018 ◽  
Vol 27 ◽  
pp. S288-S289
Author(s):  
S. Moir ◽  
T. Triebel ◽  
S. Rosmini ◽  
J. Moon
Keyword(s):  
Cardiac Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aortic Stenosis ◽  
Myocardial Function ◽  
Function Evaluation ◽  
Control Cohort ◽  
Resonance Technique ◽  
Magnetic Resonance Technique ◽  
And Control

scholarly journals Обменные взаимодействия в паре ионов Cr-=SUP=-3+-=/SUP=--Cr-=SUP=-3+-=/SUP=- в диамагнитной матрице ABO-=SUB=-3-=/SUB=- (A=Ga, In, Sc)

2020 ◽  
Vol 62 (3) ◽  
pp. 403
Author(s):  
А.М. Воротынов ◽  
В.В. Руденко ◽  
О.В. Воротынова
Keyword(s):  
Magnetic Resonance ◽  
Ion Pairs ◽  
Exchange Interactions ◽  
Resonance Technique ◽  
Biquadratic Exchange ◽  
Magnetic Resonance Technique

Abstract The exchange interactions in the Cr^3+–Cr^3+ ion pairs in the isostructural ABO_3 (A = Ga, In, Sc) diamagnetic compounds have been examined using the magnetic resonance technique. The values of bilinear and biquadratic exchange interactions have been determined. It is shown that the biquadratic exchange in the Cr^3+–Cr^3+ pair in these compounds is caused by the exchange striction.

scholarly journals Cardiac Involvement in Human Immunodeficiency Virus Infected Patients: An Observational Cardiac Magnetic Resonance Study

2021 ◽  
Vol 8 ◽  
Author(s):  
Chengxi Yan ◽  
Ruili Li ◽  
Xiaojuan Guo ◽  
Huan Yu ◽  
Wenhuan Li ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Cardiac Magnetic Resonance ◽  
Magnetic Resonance ◽  
Myocardial Fibrosis ◽  
Myocardial Function ◽  
Volume Fraction ◽  
Myocardial Inflammation ◽  
Inferior Wall ◽  
Systolic Strain ◽  
Hiv Aids

Objectives: To investigate the subclinical imaging changes in terms of myocardial inflammation and fibrosis and to explore the risk factors associated with myocardial fibrosis by cardiac magnetic resonance (CMR) approach in a Chinese HIV/AIDS cohort.Methods: We evaluated myocardial function (cine), myocardial inflammation (T1, T2), and myocardial fibrosis (through extracellular volume fraction [ECV] and late gadolinium enhancement [LGE]) by a multiparametric CMR scan protocol in a total of 68 participants, including 47 HIV-infected individuals, who were divided into two groups: asymptomatic HIV (HIV+) (n = 30), and acquired immunodeficiency syndrome (AIDS) (n = 17), and 21 healthy controls.Results: HIV-infected patients had lower left (55.3 ± 6.5 vs. 63.0 ± 7.9%, P < 0.001) and right ventricular systolic function (35.9 ± 15.7 vs. 50.8 ± 9.3%, P < 0.001). Radial systolic strain (30.7 ± 9.3 vs. 39.3 ± 9.4%, P = 0.001), circumferential systolic strain (−17.5 ± 2.6 vs. −19.4 ± 2.7%, P = 0.008), and longitudinal systolic strain (−9.4 ± 5.7 vs. −12.8 ± 3.1%, P = 0.012) were also decreased in HIV. Native T1 relaxation time (1,337.2 ± 70.2 vs. 1,249.5 ± 47.0 ms, P < 0.001), ECV value (33.5 ± 6.2 vs. 28.5 ± 2.9 ms, P = 0.026), and T2 relaxation time (45.2 ± 3.5 vs. 42.0 ± 2.6 ms, P = 0.001) were higher in HIV-infected patients compared with controls. Myocardial fibrosis, predominantly in the mid-inferior wall, was detected in 24.4% of the HIV-infected patients. HIV+ had a significantly lower value of ECV [29.1 (26.1, 31.8) vs. 35.2 (31.8, 41.9) %, P < 0.001] and frequency of LGE [3/25 (8%) vs. 7/16 (43.8%), P = 0.014)] compared with AIDS. AIDS was associated with myocardial fibrosis.Conclusions: HIV-infected patients were associated with changes in myocardial function and higher rates of subclinical myocardial inflammation and fibrosis, which were more abnormal with greater severity of the disease. AIDS was associated with myocardial fibrosis, where the observations supported earlier initiation of antiretroviral therapy in the Chinese HIV/AIDS cohort.

Modified Optically Detected Magnetic Resonance Technique for Studies of Defects in Si and GaAs

1989 ◽  
Vol 163 ◽  
Author(s):  
W.M. Chen ◽  
B. Monemar
Keyword(s):  
Magnetic Resonance ◽  
Free Carrier ◽  
Background Signal ◽  
Resonance Technique ◽  
Magnetic Resonance Technique ◽  
Optically Detected Magnetic Resonance ◽  
Optically Detected

AbstractWe discuss one of the major difficulties, namely the strong free carrier induced background signal, in studies of defects in Si and GaAs by optically detected magnetic resonance (ODMR) technique. A modified ODMR technique, namely delayed ODMR, is presented and is shown to be very successful in overcoming this difficulty.

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