[Mristudio-users] b-matrix from dicom header and from techs

[Rajagopalan, Venkateswaran]

Dear All,

we collect our data from Siemens scanner. I got b-matrix from our MR techs for software version VA25A b matrix is as follows

 0: 0.000, 0.000, 0.000
 1: 1.000, 0.000, 0.500
 2: 0.000, 0.500, 1.000
 3: 0.500, 1.000, 0.000
 4: 1.000, 0.500, 0.000
 5: 0.000, 1.000, 0.500
 6: 0.500, 0.000, 1.000
 7: 1.000, 0.000, -0.500
 8: 0.000, -0.500, 1.000
 9: -0.500, 1.000, 0.000
 10: 1.000, -0.500, 0.000
 11: 0.000, 1.000, -0.500
 12: -0.500, 0.000, 1.000

I used dcm2nii software (to convert hem into nifti file for soem other purpose  i also gives me bvec and bval files) which gives me the following matrix from the dicom header file

0	0	0
0.89	0	-0.45
0	0.45	-0.89
0.45	0.89	0
0.89	0.45	0
0	0.89	-0.45
0.45	0	-0.89
0.89	0	0.45
0	-0.45	-0.89
-0.45	0.89	0
0.89	-0.45	0
0	0.89	0.45
-0.45	0	-0.89

Since not only the values are different but +/- signs are also different in DW directions. So I am wondering whether any one could tell me which is the correct table to go with.

Thanks

Venkat


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