IDEAL MRI sequences

I was given MRI images of the liver of patients, taken with LMS IDEAL optimized low flip. I need to calculate the pdff. I have 72 images per patient with echotime ranging from 1.2ms to 11.2 ms. How do I identify which is the fat, water OP, IP image?
Thank you so much. and yes I am relative new to MRI imaging.


To calculate PDFF you’ll need to perform fitting across all echoes to estimate PDFF and R2* values. ‘Signal Intensity Fat Fraction’ would be calculated using IP and OP from a 2 point DIXON acquisition for example.

There are more details around fitting LMS IDEAL in the publication below.

Thank you so much UCLjames.
Would you mind If I contacted you via email? I have some follow up questions.
Thank you.

Thank you for your reply. I am new to MRI (it should be obvious, by now ) and I have a little more than a week to get some PDFF values from this set of images.
I have some follow up questions
1- For each echo (total of 6 echo times) I have 12 images: 6 magnitudes and 6 (I believe) phases (funny looking ones): Do I just average the 6 images together?
2 - Is each image supposed to be preprocessed some how (within -echo, withing image type) ?
3 - IDEAL is used on the phase images. In the paper, it is not clear how the magnitude images were combined with phase processes images
Thank you everyone for the help

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