[Mristudio-users] Problem loading high resolution scans into DTI Studio

Wed Mar 24 00:10:06 EDT 2010

Hi Bruce,
Thanks for your gradient table.  I can't get this to load the data. I
get the error message "forgot gradient table" which may be because
there are only 12 lines, instead of 13 (0 to 12), so when I number the
lines provided, I get a different error message "forget gradient of
B0-image?"

How do you use this gradient table?

Thanks,
Kevin

On Sun, Mar 21, 2010 at 9:09 AM, Bruce Leggett <leggwork at yahoo.com> wrote:
> this is the gradient table that I use for standard siemens 12 direction
>
>
>  X="-0.5197" Y="0.8541" Z="-0.0216"
>  X="0.5197" Y="-0.8541" Z="0.0216"
>  X="-0.1182" Y="0.4291" Z="-0.8955"
>  X="-0.7689" Y="0.0718" Z="0.6353"
>  X="0.5215" Y="0.8367" Z="-0.1673"
>  X="0.1193" Y="0.6159" Z="0.7788"
>  X="0.9157" Y="0.0436" Z="0.3994"
>  X="0.7689" Y="-0.0718" Z="-0.6353"
>  X="0.1182" Y="-0.4291" Z="0.8955"
>  X="-0.5215" Y="-0.8367" Z="0.1673"
>  X="-0.9157" Y="-0.0436" Z="-0.3994"
>  X="-0.1193" Y="-0.6159" Z="-0.7788"
>
> thanks,
> bruce
>
>
> ________________________________
> From: cwber <cwber at 126.com>
> To: "DTI Studio, ROI Editor; Landmarker Questions/Support"
> <mristudio-users at mristudio.org>
> Sent: Sat, March 20, 2010 7:15:20 PM
> Subject: Re: [Mristudio-users] Problem loading high resolution scans into
> DTI Studio
>
> HI,
>>>0: 0.000, 0.000, 0.000
>>> 1: 0.500, 0.000, 0.500
>>> 2: -0.500, 0.000, 0.500
>>> 3: 0.000, 0.500, 0.500
>>> 4: 0.000, 0.500, -0.500
>>> 5: 0.500, 0.500, 0.000
>>> 6: -0.500, 0.500, 0.000
>>> 7: 1.000, 0.000, 1.000
>>> 8: -1.000, 0.000, 1.000
>>> 9: 0.000, 1.000, 1.000
>>> 10: 0.000, 1.000, -1.000
>>> 11: 1.000, 1.000, 0.000
>>> 12: -1.000, 1.000, 0.000
> As i know, the gradient table must be normalization.such as:
> (x)^2+(y)^2+(z)^2 == 1 but your gradient table doesn't satisfy this
> condition.i am not sure if there is any problem in your table. and senmens
> trio's Dicom file saved as mosaic format, so when you choose the data format
> you should paid attention to choose the right format. and you should ask
> semens's engineer to check your gradient talbe.
> good luck!
> --
> weibo
>
> 在2010-03-21 00:42:58，"Kevin Spitler" <kevinspitler at ucla.edu> 写道：
>>I am using the same gradient table as before, which worked with the
>>low resolution data (large slice thickness).
>>
>>We are using a 3T Trio scanner in Siemens.
>>
>>Would it help if I attached one of the files from a recent scan?
>>
>>Best,
>>Kevin
>>
>>2010/3/20 cwber <cwber at 126.com>:
>>> How did you get the gradient table, there maybe something wrong in your
>>> gradient table, you can check it, and which factory's machine
> did you use
>>> philips, GE,or Semense?
>>> --
>>> 陈伟波
>>>
>>> 在2010-03-20 22:09:12，"Kevin Spitler" <kevinspitler at ucla.edu> 写道：
>>>>I haven't upgraded the operating system.  I am still using Windows XP.
>>>>
>>>>Here is the gradient table:
>>>>
>>>>0: 0.000, 0.000, 0.000
>>>> 1: 0.500, 0.000, 0.500
>>>> 2: -0.500, 0.000, 0.500
>>>> 3: 0.000, 0.500, 0.500
>>>> 4: 0.000, 0.500, -0.500
>>>> 5: 0.500, 0.500, 0.000
>>>> 6: -0.500, 0.500, 0.000
>>>> 7: 1.000, 0.000, 1.000
>>
>>> 8: -1.000, 0.000, 1.000
>>>> 9: 0.000, 1.000, 1.000
>>>> 10: 0.000, 1.000, -1.000
>>>> 11: 1.000, 1.000, 0.000
>>>> 12: -1.000, 1.000, 0.000
>>>>
>>>>Thanks for your help!  Please let me know what else I can send
>>>>
>>>>Best,
>>>>Kevin
>>>>
>>>>
>>>>On Thu, Mar 18, 2010 at 6:54 AM, susumu mori <susumu at mri.jhu.edu> wrote:
>>>>>
>>>>> Have you recently upgraded the operating system? Can I see the gradient table you used?
>>>>>
>>>>> On Wed, Mar
> 17, 2010 at 11:32 PM, Kevin Spitler <kevinspitler at ucla.edu> wrote:
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> We have recently starting acquiring high resolution scans and I am having difficulty loading them into DTI Studio.  I am using the same 12 direction gradient that worked on the low resolution (large slice thickness).  Although the DTI Studio program does not crash, the color map 0 generated is not correct (random color patterns over the tissue).
>>>>>>
>>>>>> The study was performed on&nbs
> p;a 3T Trio scanner in Siemens.
>>>>>> b values are b=0, b=600, b=1200
>>>>>> Direction is 12
>>>>>>
>>>>>> I can provide more information or attach files if that would help solve the problem.  Thanks for your help
>>>>>>
>>>>>> Best,
>>>>>> Kevin
>>>>>> _______________________________________________
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>>>>>
>>>>>
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