Degraded quality of NODDI maps

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Sittaya Buathong

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Nov 13, 2022, 11:23:40 AM11/13/22
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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

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Nov 14, 2022, 5:26:54 PM11/14/22
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Hi,

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

Gary

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Sittaya Buathong

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Nov 20, 2022, 4:26:49 AM11/20/22
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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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