Degraded quality of NODDI maps

[Sittaya Buathong]

Dear All,

My college and I am trying to create protocol for NODDI at our instituition. I found some problems. The maps derived from this protocol are not good. There are some data loss/artifact at the center of ficvf and the details of ODI are degraded.  I am not sure if the problem are from sequence of b-value which now I use b3000 with interspersed b0 and b1500.  For example --> 0 3000 1500 3000 3000 3000   0 1500 3000 3000 3000 3000... . Or is it more likely to be an artifact from using Unipolar scheme rather than bipolar scheme. Or should I look for any other factures like slice thickness ?. 

Do you have any suggestion ? Thank you very much. 

Best regards, 

Sittaya

[Hui Zhang]

Hi,

Can you please provide the full details of your protocol and the scanner model?

Gary

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[Sittaya Buathong]

Dear Gary,

Thank you for your prompt reply. My protocol consists of 92 directions of b-vector with 14xb0, 17xb1500 and 61xb3000 in the sequence example as I mentioned before. I am not sure if there is any adjustment that will be helpful. 

Best regards, 

Sittaya

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