search

wtclarke / fsl_mrs

Mirror of the FSL-MRS gitlab repository
https://git.fmrib.ox.ac.uk/fsl/fsl_mrs
Other
14 stars 8 forks source link

FSL MRS standard fitting model #9

Closed lenn19 closed 2 years ago

lenn19 commented 2 years ago

Hello,

I have a question regarding the paper FSL-MRS: AN end-to-end spectroscopy analysis package. In chapter 2.4.1 you mention the standard fitting model. In the first term M_l,g contains 𝜈;γg,𝜎g,𝜀g but in the second term M_l,g only contains 𝜈;𝛾 ,𝜀 although in the FFT 𝜎g is mentioned. Would you explain this to me?

Reguards

wtclarke commented 2 years ago

Hi @lenn19 This looks like the two available line shape models (lorentzian and voigt) have been muddled up in the equations. The first models the lineshapes as purely Lorentzian , a function of a single parameter (γ), whilst the second models them as a mixture of Lorentzian and Gaussian functions, i.e. two parameters (γ and 𝜎). The model used is selectable on the command line.

lenn19 commented 2 years ago

Thank you a lot!