Mathieu Dubois
I have recently noticed that there is a 4th pre-processing steps for T1 images (after gradwarping, B1 correction and N3 correction) called scaling. It's those images that are in MPRAGEMETA. I have not found information on this (except here for the explanation of the scaled_2 image).
The first 3 steps (which may be optional depending on the scanner) are well described here. If I'm correct, the B1 correction uses a phantom (I guess it's the image labeled "B1-Calibration Body").
What about scaling? If I understand correctly, it uses a phantom too. Is it the image labeled "B1 calibration PA"?
Thanks in advance,
Mathieu
Danielle J Harvey
I don’t know the specifics of all of the file names or what each type of pre-processing does. These are questions that the MRI Core should be able to answer if you use the Ask the Experts tool on the ADNI website (http://adni.loni.usc.edu/support/experts-knowledge-base/ask-experts/) and direct the question to the MRI Core.
You might also look up ADNI articles on which Cliff Jack is an author.
Danielle
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