scholarly journals Magnetization transfer ratio may be a surrogate of spongiform change in human prion diseases

Brain ◽  
2010 ◽  
Vol 133 (10) ◽  
pp. 3058-3068 ◽  
Author(s):  
D. Siddique ◽  
H. Hyare ◽  
S. Wroe ◽  
T. Webb ◽  
R. Macfarlane ◽  
...  
Keyword(s):  
Prion Diseases ◽  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio ◽  
Spongiform Change

A fast B1-mapping method for the correction and normalization of magnetization transfer ratio maps at 3 T

NeuroImage ◽  
2010 ◽  
Vol 49 (4) ◽  
pp. 3015-3026 ◽  
Author(s):  
Steffen Volz ◽  
Ulrike Nöth ◽  
Anna Rotarska-Jagiela ◽  
Ralf Deichmann
Keyword(s):  
Magnetization Transfer ◽  
Mapping Method ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio ◽  
B1 Mapping

Cervical cord magnetization transfer ratio and clinical changes over 18 months in patients with relapsing-remitting multiple sclerosis: a preliminary study

2006 ◽  
Vol 12 (5) ◽  
pp. 662-665 ◽  
Author(s):  
A Charil ◽  
D Caputo ◽  
R Cavarretta ◽  
M P Sormani ◽  
P Ferrante ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Relapse Rate ◽  
Magnetization Transfer ◽  
Small Sample ◽  
Cervical Cord ◽  
Magnetization Transfer Ratio ◽  
Short Term ◽  
Disease Evolution ◽  
Transfer Ratio ◽  
Relapsing Remitting

Background Magnetization transfer ratio (MTR) permits the quantitative estimation of cervical cord tissue damage in patients with multiple sclerosis (MS). Objective To determine whether a single time-point MTR scan of the cervical cord is associated with short-term disease evolution in patients with relapsing-remitting (RR) MS. Methods Using a 1.5-T magnetic resonance imaging (MRI) system with a tailored cervical cord phased array coil, fast short-tau inversion recovery (fast-STIR) and MTR scans were obtained from 14 untreated patients with RRMS at baseline. Cervical cord MTR histograms were derived. Over the 18- month follow-up period, relapse rate was measured and disability assessed by the Expanded Disability Status Scale (EDSS) score. Results Average cervical cord MTR was correlated with relapse rate ( r= -0.56, P = 0.037). A moderate correlation ( r values ranging from -0.33 to -0.36) between baseline cervical cord MTR metrics and EDSS changes over 18 months was also noted, albeit statistical significance was not reached ( P = 0.26 and 0.21, respectively) perhaps because of the relatively small sample size. Conclusions This study suggests that a ‘snapshot’ MT MRI assessment of the cervical cord may detect cervical cord tissue changes associated with short-term disease evolution in RRMS.

Measurement of magnetization transfer ratio (MTR) from cervical spinal cord: Multicenter reproducibility and variability

2018 ◽  
Vol 49 (6) ◽  
pp. 1777-1785 ◽  
Author(s):  
Benoit Combès ◽  
Laureline Monteau ◽  
Elise Bannier ◽  
Virginie Callot ◽  
Pierre Labauge ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Cervical Spinal Cord ◽  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio

Magnetization Transfer Ratio in Peripheral Nerve Tissue

2018 ◽  
Vol 53 (7) ◽  
pp. 397-402 ◽  
Author(s):  
Jennifer Kollmer ◽  
Thorsten Kästel ◽  
Johann M.E. Jende ◽  
Martin Bendszus ◽  
Sabine Heiland
Keyword(s):  
Peripheral Nerve ◽  
Magnetization Transfer ◽  
Nerve Tissue ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio

scholarly journals Magnetization transfer ratio quantifies polyneuropathy in hereditary transthyretin amyloidosis

2020 ◽  
Vol 7 (5) ◽  
pp. 799-807 ◽  
Author(s):  
Jennifer Kollmer ◽  
Ute Hegenbart ◽  
Christoph Kimmich ◽  
Ernst Hund ◽  
Jan C. Purrucker ◽  
...  
Keyword(s):  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Transthyretin Amyloidosis ◽  
Transfer Ratio ◽  
Hereditary Transthyretin Amyloidosis

Brain atrophy and magnetization transfer ratio following methylprednisolone in multiple sclerosis: short-term changes and long-term implications

2005 ◽  
Vol 11 (2) ◽  
pp. 140-145 ◽  
Author(s):  
Robert J Fox ◽  
Elizabeth Fisher ◽  
Jean Tkach ◽  
Jar-Chi Lee ◽  
Jeffrey A Cohen ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Disease Activity ◽  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Short Term ◽  
Whole Brain ◽  
Transfer Ratio ◽  
Short Term Change ◽  
Term Change ◽  
The Impact

Background: The short-term effect of corticosteroids on MRI measures of multiple sclerosis (MS) is not well understood and may have a significant impact when using these quantitative measures to evaluate disease activity and changes following other therapeutic interventions. Objective: To determine the impact of a course of intravenous methylprednisolone (IVMP) on quantitative measures of disease activity and tissue injury in MS patients. Methods: We prospectively measured brain parenchymal fraction (BPF), magnetization transfer ratio (MTR, lesional and whole brain), and lesion volumes on nine weekly brain MRI studies in ten MS patients receiving a course of IVMP. A group of nine MS patients not receiving IVMP served as controls. Results: In comparison to untreated controls, BPF declined over the eight weeks following IVMP treatment (P<0.02). BPF decline was most prominent in patients with secondary progressive MS (SPMS, P<0.03), and was not seen in relapsing-remitting (RR) MS patients. Short-term change in BPF correlated with baseline BPF (r=0.62, P=0.05) and short-term change in lesional MTR (r=-0.55, P=0.03), but not with change in enhancing lesion volume. Short-term change in lesional MTR inversely correlated with baseline lesional and whole brain MTR (r=-0.79, P=0.04 for both). There was no significant difference between treated and control patients in measures of MTR or T2, T1 or enhancing lesion volumes. Conclusions: Patients with SPMS showed a greater decline in BPF following IVMP than RRMS patients. A correlation between changes in BPF and MTR suggest that these changes are secondary to altered water content within MS lesions. Differential response to a standardized therapeutic intervention in RRMS and SPMS suggests that responses to therapy may differ due to a fundamental pathologic difference between early and late stage MS.

Characterization of white matter damage in animal models of multiple sclerosis by magnetization transfer ratio and quantitative mapping of the apparent bound proton fraction f*

2009 ◽  
Vol 15 (1) ◽  
pp. 16-27 ◽  
Author(s):  
M Rausch ◽  
PS Tofts ◽  
P Lervik ◽  
AR Walmsley ◽  
A Mir ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Animal Models ◽  
Tissue Damage ◽  
Magnetization Transfer ◽  
Transverse Relaxation Time ◽  
Magnetization Transfer Ratio ◽  
White Matter Damage ◽  
Transfer Ratio ◽  
Quantitative Mapping

Quantitative magnetization transfer magnetic resonance imaging (qMT-MRI) can be used to improve detection of white matter tissue damage in multiple sclerosis (MS) and animal models thereof. To study the correlation between MT parameters and tissue damage, the magnetization transfer ratio (MTR), the parameter f* (closely related to the bound proton fraction) and the bound proton transverse relaxation time T2B of lesions in a model of focal experimental autoimmune encephalomyelitis (EAE) were measured on a 7T animal scanner and data were compared with histological markers indicative for demyelination, axonal density, and tissue damage. A clear spatial correspondence was observed between reduced values of MTR and demyelination in this animal model. We observed two different levels of MTR and f* reduction for these lesions. One was characterized by a pronounced demyelination and the other corresponded to a more severe loss of the cellular matrix. Changes in f* were generally more pronounced than those of MTR in areas of demyelination. Moreover, a reduction of f* was already observed for tissue where MTR was virtually normal. No changes in T2B were observed for the lesions. We conclude that MTR and qMT mapping are efficient and reliable readouts for studying demyelination in animal models of MS, and that the analysis of regional f* might be even superior to the analysis of MTR values. Therefore, quantitative mapping of f* from human brains might also improve the detection of white matter damage in MS.

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