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MRI Forum: IDEAL sequence help
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gianluca turcatel

Mon. 10 Jan.22,
13:21
IDEAL sequence help
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,IN images?
Thank you so much. and yes I am relative new to MRI imaging.
THANKS!

Gina Key

Sat. 27 Jan.24,
09:33
To calculate the Proton Density Fat Fraction (PDFF) from MRI images of the liver acquired using LMS IDEAL (Iterative Decomposition of Water and Fat with Echo Asymmetry and Least Squares Estimation) with optimized low flip angles, you'll typically have multiple image sets corresponding to different echoes. The fat and water signals are separated based on their chemical shift differences. Look for image sets labeled as Water, Fat, or PDFF (Proton Density Fat Fraction). Depending on the software or DICOM tags used, the images may be explicitly labeled, or you may need to review the sequence parameters to determine which set corresponds to fat or water.

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