A method for an accurate T1 relaxation-time measurement compensating B1 field inhomogeneity in magnetic-resonance imaging

2005 ◽  
Vol 97 (10) ◽  
pp. 10E107 ◽  
Author(s):  
Hiroaki Mihara ◽  
Masaki Sekino ◽  
Norio Iriguchi ◽  
Shoogo Ueno
Keyword(s):  
Magnetic Resonance Imaging ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Time Measurement ◽  
Field Inhomogeneity ◽  
Resonance Imaging ◽  
T1 Relaxation Time ◽  
T1 Relaxation ◽  
Relaxation Time Measurement ◽  
B1 Field

S11-4 Associations between exposure to MN and T1 relaxation time in magnetic resonance imaging

2016 ◽  
Author(s):  
Anne Lotz ◽  
Beate Pesch ◽  
Clara Quetscher ◽  
Chien-Lin Yeh ◽  
Martin Lehnert ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
T1 Relaxation Time ◽  
T1 Relaxation

Hypothalamic involvement assessed by T1 relaxation time in patients with relapsing—remitting multiple sclerosis

2009 ◽  
Vol 15 (12) ◽  
pp. 1442-1449 ◽  
Author(s):  
Francesco Zellini ◽  
Graham Niepel ◽  
Christopher R Tench ◽  
Cris S Constantinescu
Keyword(s):  
Magnetic Resonance Imaging ◽  
Multiple Sclerosis ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
T1 Relaxation Time ◽  
T1 Relaxation ◽  
Relapsing Remitting ◽  
Fatigue Severity ◽  
Relapsing Remitting Multiple Sclerosis

Recent work in multiple sclerosis, focusing on neuropathological abnormalities, found a frequent and severe hypothalamic involvement. The possible clinical implications are disturbances in sleep and sexual activity, depression, memory impairment and fatigue. Despite this there are no magnetic resonance imaging studies focusing on in vivo hypothalamic pathology in multiple sclerosis. Our objective was to investigate magnetic resonance imaging-detectable abnormalities related to pathological changes in the hypothalamus of patients with multiple sclerosis, and to subsequently explore the relationship with fatigue. We used T1 relaxation time as a sensitive measure of pathology. Using region of interest analysis, median T1 values in the hypothalamus were measured in 44 relapsing—remitting multiple sclerosis patients and in 13 healthy controls. Fatigue was assessed using the Fatigue Severity Scale, and patients were divided in two subgroups, fatigued and non-fatigued, according to Fatigue Severity Scale scores. We found a significantly higher T1 relaxation time in the hypothalamus of multiple sclerosis patients compared with controls ( p = 0.027). There was a significant correlation between T1 values and fatigue severity (rho 0.437, p = 0.008), and median T1 values were different among the study groups. Our results show that pathological involvement of the hypothalamus in relapsing—remitting multiple sclerosis is detectable using magnetic resonance imaging, and that the pathology measured by quantitative T1 might reflect fatigue.

scholarly journals Nanodiamond phantoms mimicking human liver: perspective to calibration of T1 relaxation time in magnetic resonance imaging

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna Sękowska ◽  
Daria Majchrowicz ◽  
Agnieszka Sabisz ◽  
Mateusz Ficek ◽  
Barbara Bułło-Piontecka ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Human Liver ◽  
Resonance Imaging ◽  
T1 Relaxation Time ◽  
T1 Relaxation
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