[Mristudio-users] ask for help on Philips AcHieva 1.5 T scanner gradient table

[罗璐娇]

Yes, with one b0 image.



在 2013-07-04 19:26:14，"Manuela Kamsu" <manuelakamsu at live.fr> 写道：

Was your acquisition performed with 16 gradient directions 

Envoyé de mon iPhone

Le Jul 4, 2013 à 12:56 PM, Asrın NALBANT <analbant at medipol.edu.tr> a écrit :



Hello, i am new user i dont know very well this programme
so i cant help you.

04 Tem 2013 08:25 tarihinde "罗璐娇" <lujiaoluo1990 at 126.com> yazdı:

Hello experts,
I was using dti studio to process my diffusion data obtained from Philips AcHieva 1.5 T scanner(medium angular, format: DICOM, in total of 17 images) .


I used the pre-defined gradient table in dti studio listed below, while plus the 16th line to exclude the last average image
0:   0,    0,    0
1:   1.0,  0.0,  0.0
2:   0.0,  1.0,  0.0
3:   0.0,  0.0,  1.0
4:   -0.1789,  -0.1113,  -0.9776
5:   -0.0635,  0.3767,  -0.9242
6:   0.710,  0.0516,  -0.7015
7:   0.6191,  -0.4385,  -0.6515
8:   0.2424,  0.7843,  -0.5710
9:   -0.2589,  -0.6180,  -0.7423
10:   -0.8169,  0.1697,  -0.5513
11:   -0.8438,  0.5261,  -0.1060
12:   -0.2626,  0.9548,  -0.1389
13:   0.0001,  0.9689,  0.2476
14:   0.7453,  0.6663,  0.0242
15:   0.9726,  0.2317,  0.0209
16:    100    100    100


But resulting images were not that fine, and couldn't distinguish the fiber orientations clearly. I tried to use mricron (dcm2niigue.exe) to obtain the bvecs and bvals file. But it also doesn't work. 
Would you please tell me how to solve this problem?


Thanks so much!



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