Hi,

I have a dataset with b0, b1000 and b2000 that has been acquired with two averages. So the data is saved as follows:

First the b0 image, then 20 directions with b1000, then 20 directions with b2000, then next average with b0, 20 x b1000 and finally 20 x b2000. Can I use the data as is, or do I have to average the two acquisitions?

Thanks,
Live

Hello Live,

DKE will average the two acquisitions if your input images are in dicom format.

Thanks for using DKE!
Corinne

Hi Corinne,

Thanks for your fast reply. 

But how will the bvec.dat files look like then? When making the bvec.dat files the 0 for the b0 is not supposed to be in the .dat file, but then I will have to have a 0 in the .dat file?

Best,
Live

Hi Live,

The following excerpt from the DKE User Manual should help answer your question.

Gradient Vectors
Select the gradient table from a list of available tables or specify a custom table. A custom table
can be a '.dat' or '.txt' file. Each row corresponds to a gradient vector [Gx, Gy, Gz]. When
specifying a custom table, remove gradients that could correspond to the B0 image [0, 0, 0].
When using a 4D NIfTi, make sure that the 4D order corresponds to the order of the gradient
table. If a DICOM set is used, DKE will order the images according to the information stored in
the DICOM tag-(0018, 0024) 'SequenceName'.

Thanks,
Corinne