N3m correction versus Scaled

Mathieu Dubois

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Jul 21, 2015, 5:58:33 PM7/21/15

to Alzheimer's Disease Neuroimaging Initiative (ADNI) Data

Hi,

I have noticed that some series have a step called N3m. For instance series 93981 has the following images:

Image ID | Sequence

---------|-------------------------------------------

200795 | MP-RAGE

438650 | MT1; GradWarp; N3m

217978 | MPR; GradWarp; B1 Correction; N3; Scaled

If I understand this paper, N3m is better than N3 + Scaled, right? As the image ID is larger for the N3m image, I guess it has been added to the system later.

Mathieu Dubois

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Jul 22, 2015, 5:39:03 AM7/22/15

to Alzheimer's Disease Neuroimaging Initiative (ADNI) Data

By the way, I have noticed that the file "ADNI_CompleteVisitList_8_22_12.csv" (in the preferred image data for 1.5T) contains several lines for each study. Usually this for series that have N3m and N3+Scaled images. Should this file be used in the process of selecting the preferred image?

Mathieu Dubois

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Jul 24, 2015, 8:57:52 AM7/24/15

to Alzheimer's Disease Neuroimaging Initiative (ADNI) Data, duboismat...@yahoo.fr

Any idea on this issue?

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