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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Seongjin,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In Philips, there are 3 types (low: 6,
medium: 15, high: 32) x 2 (overplus on/off) = 6 gradient tables.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The medium with "overplus = off"
should look like;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 0:
0, 0, 0<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 1:
1, 0, 0<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 2:
0, 1, 0<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 3:
0, 0, 1<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 4:
-0.0424,-0.1146,-0.9925 <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 5:
0.1749,-0.2005,-0.9639<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 6:
0.2323,-0.1626,-0.9590<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 7:
0.3675,0.0261,-0.9296 <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 8:
0.1902,0.3744,-0.9076<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 9:
-0.1168,0.8334,-0.5402 <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 10:
-0.2005,0.2527,-0.9466<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 11:
-0.4958,0.1345,-0.8580<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 12:
-0.0141,-0.6281,-0.7780<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 13:
-0.7445,-0.1477,-0.6511<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 14:
-0.7609,0.3204,-0.5643<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 15:
-0.1809,0.9247,-0.33510<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 16:
-0.6796,-0.4224,-0.5997<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 17:
0.7771,0.4707,-0.4178<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 18:
0.9242,-0.1036,-0.3677<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 19:
0.4685,-0.7674,-0.4378<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 20:
0.8817,-0.1893,-0.4322<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 21:
0.6904,0.7062,-0.1569<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 22:
0.2391,0.7571,-0.6080<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 23:
-0.0578,0.9837,0.1703<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 24:
-0.5368,0.8361,-0.1135<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 25:
-0.9918,-0.1207,-0.0423<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 26:
-0.9968,0.0709,-0.0379<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 27:
-0.8724,0.4781,-0.1014<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 28:
-0.2487,0.9335,0.2581<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 29:
0.1183,0.9919,-0.0471<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 30:
0.3376,0.8415,0.4218<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 31:
0.5286,0.8409,0.1163<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> 32:
0.9969,0.0550,-0.0571<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Also, please note that the "0, 0,
0" could be the first or the last image depending on how you specify the
output files.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Susumu<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mristudio-users-bounces@mristudio.org
[mailto:mristudio-users-bounces@mristudio.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>[Seongjin]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 23, 2008
3:47 PM<br>
<b><span style='font-weight:bold'>To:</span></b> DTI Studio, ROI Editor,
Landmarker Questions/Support<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Mristudio-users] Philips
gradient tables</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Dear DTIstudio users,<br>
<br>
I wonder if you have gradient tables for Philips Achieva system.<br>
<br>
>From a source I have a gradient table for low resolution as follows:<br>
<br>
0:1.0000, 0.0000, 0.0000<br id=u3ia>
1:0.0000, 1.0000, 0.0000<br id=u3ia0>
2:0.0000, 0.0000, 1.0000<br id=u3ia1>
3:-0.7044, -0.0881, -0.7044<br id=u3ia2>
4:0.7044, 0.7044, 0.0881<br id=u3ia3>
5:0.0881, 0.7044, 0.7044<br id=u3ia4>
6:0.0000, 0.0000, 0.0000<br>
<br>
<br>
For medium,<br>
<br>
0: 0.7071 -0.7071 1.00<br id=uo8j>
1: 0.7071 -0.7071 -1.00<br id=uo8j0>
2: 1.0000 1.0000 0.0000<br id=uo8j1>
3: 0.9999 -0.1561 0.9879<br id=uo8j2>
4: 0.9894 0.4091 0.9240<br id=uo8j3>
5: 0.4674 0.8874 0.9970<br id=uo8j4>
6: 0.3866 0.9297 0.9930<br id=uo8j5>
7: 0.7667 -0.9511 0.7124<br id=uo8j6>
8: 0.6945 0.9954 -0.7295<br id=uo8j7>
9: 0.3580 -0.9800 -0.9547<br id=uo8j8>
10: 1.0000 -0.9992 -0.0392<br id=uo8j9>
11: 0.9999 -0.3989 -0.9171<br id=uo8j10>
12: 0.9923 0.4082 -0.9213<br id=uo8j11>
13: 0.9989 0.9982 -0.0759<br id=uo8j12>
14: 0.2899 0.9919 -0.9655<br id=uo8j13>
15: 0.0000 0.0000 0.0000<br>
<br>
<br>
For high,<br>
<br>
0: 1.000, 0.000, 0.000<br id=fc0h2>
1: 0.000, 1.000, 0.000<br id=fc0h3>
2: 0.000, 0.000, 1.000<br id=fc0h4>
3: -0.042, -0.115, -0.993<br id=fc0h5>
4: 0.175, -0.200, -0.964<br id=fc0h6>
5: 0.232, -0.163, -0.959<br id=fc0h7>
6: 0.368, 0.026, -0.930<br id=fc0h8>
7: 0.190, 0.374, -0.908<br id=fc0h9>
8: -0.117, 0.833, -0.540<br id=fc0h10>
9: -0.200, 0.253, -0.947<br id=fc0h11>
10: -0.496, 0.134, -0.858<br id=fc0h12>
11: -0.014, -0.628, -0.778<br id=fc0h13>
12: -0.744, -0.148, -0.651<br id=fc0h14>
13: -0.761, 0.320, -0.564<br id=fc0h15>
14: -0.181, 0.925, -0.335<br id=fc0h16>
15: -0.680, -0.422, -0.600<br id=fc0h17>
16: 0.777, 0.471, -0.418<br id=fc0h18>
17: 0.924, -0.104, -0.368<br id=fc0h19>
18: 0.468, -0.767, -0.438<br id=fc0h20>
19: 0.882, -0.189, -0.432<br id=fc0h21>
20: 0.690, 0.706, -0.157<br id=fc0h22>
21: 0.239, 0.757, -0.608<br id=fc0h23>
22: -0.058, 0.984, 0.170<br id=fc0h24>
23: -0.537, 0.836, -0.113<br id=fc0h25>
24: -0.992, -0.121, -0.042<br id=fc0h26>
25: -0.997, 0.071, -0.038<br id=fc0h27>
26: -0.872, 0.478, -0.101<br id=fc0h28>
27: -0.249, 0.933, 0.258<br id=fc0h29>
28: 0.118, 0.992, -0.047<br id=fc0h30>
29: 0.338, 0.841, 0.422<br id=fc0h31>
30: 0.529, 0.841, 0.116<br id=fc0h32>
31: 0.997, 0.055, -0.057<br id=fc0h33>
32: 0.000, 0.000, 0.000<br id=fc0h34>
<br>
<br>
I wonder if the tables above are correct or not. Is there anything incorrect or
partially incomplete, please let me know.<br>
Thanks in advance.<br>
<br>
Sincerely,<br>
Seongjin <o:p></o:p></span></font></p>
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