[Mristudio-users] 16 direction Philips gradient tables
Seongjin
choisj70 at gmail.com
Wed Jan 7 19:27:12 EST 2009
Sumei,
The number starts from 0 and ends as 15. So the total number of gradients is
16.
I recommend you following link for the gradient table of Philips system.
http://godzilla.kennedykrieger.org/~jfarrell/OTHERphilips/GUI.html<http://godzilla.kennedykrieger.org/%7Ejfarrell/OTHERphilips/GUI.html>
To use the JAVA applet, you should have a JAVA run time environment (JRE)
installed on your computer.
Good luck.
SC
On Wed, Jan 7, 2009 at 4:39 PM, Wang, Sumei <Sumei.Wang at uphs.upenn.edu>wrote:
> Hi all,
>
> Does anybody have 16 direction gradient table (medium) for Philips system?
> I searched the forum and just got 15 dir gradient table as follows.
>
> Thanks for your help.
>
> Sumei
>
> -----Original Message-----
> *From:* mristudio-users-bounces at mristudio.org [mailto:
> mristudio-users-bounces at mristudio.org]*On Behalf Of *susumu
> *Sent:* Friday, July 25, 2008 7:13 AM
> *To:* 'DTI Studio, ROI Editor, Landmarker Questions/Support'
> *Subject:* Re: [Mristudio-users] Philips gradient tables
>
> Seongjin,
>
>
>
> In Philips, there are 3 types (low: 6, medium: 15, high: 32) x 2 (overplus
> on/off) = 6 gradient tables.
>
>
>
> The "gradient overplus = on" always use at least two gradients to enhance b
> efficiency and therefore gaining several millisecond of echo time. In your
> example, the low and high is "overplus = off" and the medium is "overplus =
> on". You can see "1, 0, 0" in the first two but not in the medium.
>
>
>
> The medium with "overplus = off" should look like;
>
>
>
> 0: 0, 0, 0
>
> 1: 1, 0, 0
>
> 2: 0, 1, 0
>
> 3: 0, 0, 1
>
> 4: -0.0424,-0.1146,-0.9925
>
> 5: 0.1749,-0.2005,-0.9639
>
> 6: 0.2323,-0.1626,-0.9590
>
> 7: 0.3675,0.0261,-0.9296
>
> 8: 0.1902,0.3744,-0.9076
>
> 9: -0.1168,0.8334,-0.5402
>
> 10: -0.2005,0.2527,-0.9466
>
> 11: -0.4958,0.1345,-0.8580
>
> 12: -0.0141,-0.6281,-0.7780
>
> 13: -0.7445,-0.1477,-0.6511
>
> 14: -0.7609,0.3204,-0.5643
>
> 15: -0.1809,0.9247,-0.33510
>
> 16: -0.6796,-0.4224,-0.5997
>
> 17: 0.7771,0.4707,-0.4178
>
> 18: 0.9242,-0.1036,-0.3677
>
> 19: 0.4685,-0.7674,-0.4378
>
> 20: 0.8817,-0.1893,-0.4322
>
> 21: 0.6904,0.7062,-0.1569
>
> 22: 0.2391,0.7571,-0.6080
>
> 23: -0.0578,0.9837,0.1703
>
> 24: -0.5368,0.8361,-0.1135
>
> 25: -0.9918,-0.1207,-0.0423
>
> 26: -0.9968,0.0709,-0.0379
>
> 27: -0.8724,0.4781,-0.1014
>
> 28: -0.2487,0.9335,0.2581
>
> 29: 0.1183,0.9919,-0.0471
>
> 30: 0.3376,0.8415,0.4218
>
> 31: 0.5286,0.8409,0.1163
>
> 32: 0.9969,0.0550,-0.0571
>
>
>
> In general, I do not recommend to user "overplus = on", because tensor
> calculation get complicated when oblique planes are used. You have to
> recalculate the table based on the image angles.
>
>
>
> Also, please note that the "0, 0, 0" could be the first or the last image
> depending on how you specify the output files.
>
>
>
> Susumu
>
>
> ------------------------------
>
> *From:* mristudio-users-bounces at mristudio.org [mailto:
> mristudio-users-bounces at mristudio.org] *On Behalf Of *[Seongjin]
> *Sent:* Wednesday, July 23, 2008 3:47 PM
> *To:* DTI Studio, ROI Editor, Landmarker Questions/Support
> *Subject:* [Mristudio-users] Philips gradient tables
>
>
>
> Dear DTIstudio users,
>
> I wonder if you have gradient tables for Philips Achieva system.
>
> >From a source I have a gradient table for low resolution as follows:
>
> 0:1.0000, 0.0000, 0.0000
> 1:0.0000, 1.0000, 0.0000
> 2:0.0000, 0.0000, 1.0000
> 3:-0.7044, -0.0881, -0.7044
> 4:0.7044, 0.7044, 0.0881
> 5:0.0881, 0.7044, 0.7044
> 6:0.0000, 0.0000, 0.0000
>
>
> For medium,
>
> 0: 0.7071 -0.7071 1.00
> 1: 0.7071 -0.7071 -1.00
> 2: 1.0000 1.0000 0.0000
> 3: 0.9999 -0.1561 0.9879
> 4: 0.9894 0.4091 0.9240
> 5: 0.4674 0.8874 0.9970
> 6: 0.3866 0.9297 0.9930
> 7: 0.7667 -0.9511 0.7124
> 8: 0.6945 0.9954 -0.7295
> 9: 0.3580 -0.9800 -0.9547
> 10: 1.0000 -0.9992 -0.0392
> 11: 0.9999 -0.3989 -0.9171
> 12: 0.9923 0.4082 -0.9213
> 13: 0.9989 0.9982 -0.0759
> 14: 0.2899 0.9919 -0.9655
> 15: 0.0000 0.0000 0.0000
>
>
> For high,
>
> 0: 1.000, 0.000, 0.000
> 1: 0.000, 1.000, 0.000
> 2: 0.000, 0.000, 1.000
> 3: -0.042, -0.115, -0.993
> 4: 0.175, -0.200, -0.964
> 5: 0.232, -0.163, -0.959
> 6: 0.368, 0.026, -0.930
> 7: 0.190, 0.374, -0.908
> 8: -0.117, 0.833, -0.540
> 9: -0.200, 0.253, -0.947
> 10: -0.496, 0.134, -0.858
> 11: -0.014, -0.628, -0.778
> 12: -0.744, -0.148, -0.651
> 13: -0.761, 0.320, -0.564
> 14: -0.181, 0.925, -0.335
> 15: -0.680, -0.422, -0.600
> 16: 0.777, 0.471, -0.418
> 17: 0.924, -0.104, -0.368
> 18: 0.468, -0.767, -0.438
> 19: 0.882, -0.189, -0.432
> 20: 0.690, 0.706, -0.157
> 21: 0.239, 0.757, -0.608
> 22: -0.058, 0.984, 0.170
> 23: -0.537, 0.836, -0.113
> 24: -0.992, -0.121, -0.042
> 25: -0.997, 0.071, -0.038
> 26: -0.872, 0.478, -0.101
> 27: -0.249, 0.933, 0.258
> 28: 0.118, 0.992, -0.047
> 29: 0.338, 0.841, 0.422
> 30: 0.529, 0.841, 0.116
> 31: 0.997, 0.055, -0.057
> 32: 0.000, 0.000, 0.000
>
>
> I wonder if the tables above are correct or not. Is there anything
> incorrect or partially incomplete, please let me know.
> Thanks in advance.
>
> Sincerely,
> Seongjin
>
>
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