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A standardised method for measuring magnetisation transfer ratio on MR imagers from different manufacturers - the EuroMT sequence
journal contribution
posted on 2023-06-07, 13:49 authored by G. J. Barker, W. G. Schreiber, A. Gass, J. P. Ranjeva, A. Campi, J. H. van Waesberghe, J. M. Franconi, H. C. Watt, P. S. ToftsMagnetisation transfer ratio (MTR) is increasingly used to evaluate neurological disorders, especially those involving demyelination. It shows promise as a surrogate marker of disease progression in treatment trials in multiple sclerosis (MS) but the value measured is highly dependent on pulse sequence parameters, making it hard to include the technique in large multi-centre clinical trials. The variations can be reduced by a normalisation procedure based on the flip angle and timing of the presaturation pulse, but correction for parameters such as saturation pulse shape, amplitude, duration and offset frequency remains problematic. We have defined a standard pulse sequence, to include a standard presaturation pulse and set of parameters, which can be implemented on scanners from both General Electric and Siemens, and has also been used on Phillips scanners. To validate the sequence and parameters, six European centres measured MTR in the frontal white matter of normal volunteers. It was possible to measure MTR values in controls which were consistent to within approximately +/-2.5 percentage units across sites. This degree of precision may be adequate in many situations. The remaining differences between sites and manufacturers are probably caused by B1 errors.
History
Publication status
- Published
Journal
Magnetic Resonance Materials in Physics, Biology and MedicineISSN
0968-5243Publisher
Springer VerlagExternal DOI
Issue
2Volume
18Page range
76-80Department affiliated with
- BSMS Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2007-02-28Usage metrics
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