[Mristudio-users] problem calculating Tensor, ADC Map

[Kevin Spitler]

I have tried b-values of 0,600,1200 with the same results.  I also
tried setting the b-value to 1 with the same results.
Interestingly, when clicking on calculate the ADC map in the DtiMap
tab, I can uncheck the "Consider B-Value" box in the ADC-Map Options
pop up window and I still get the same results.

Does this mean that there is another problem, not the b-value?

Thanks,
Kevin

On Mon, Nov 15, 2010 at 6:46 PM, susumu mori <susumu at mri.jhu.edu> wrote:
> Please make sure that you didn't put 0 or a negative value at "b-value"
> section.
>
> On Sun, Nov 14, 2010 at 12:05 PM, Kevin Spitler <kevinspitler at ucla.edu>
> wrote:
>>
>> Hi,
>>
>> I am able to load my data into DTI Studio and can (on the DtiMap tab) run
>> Original ADC Mean STD
>> Mean (DWIs, B0s)
>>
>> My problem is that when I try either Calculation >> Tensor , Color Map,
>> etc
>> or Calculation >> ADC Map
>>
>> I get completely black views for axial, sagital, and coronal (and the
>> 3d view in the upper left).  I do not get an error message.  What
>> could be causing this?
>>
>> I get the same results regardless of choosing "create a mask image
>> based on the background noise level 10" or choosing to "Select a mask
>> image b0"
>>
>> I am using DTI Studio 3.0.3 (Sept 2010) on Windows 7 OS.
>>
>> My old data files load and I can do tractography on my old data.
>>
>> I am using Siemens Gradient:
>> 0: 0, 0, 0
>> 1:  1.000000, 0.414250, -0.414250
>> 2:  1.000000, -0.414250, -0.414250
>> 3:  1.000000, -0.414250, 0.414250
>> 4:  1.000000, 0.414250, 0.414250
>> 5:  0.414250, 0.414250, 1.000000
>> 6:  0.414250, 1.000000, 0.414250
>> 7:  0.414250, 1.000000, -0.414250
>> 8:  0.414250, 0.414250, -1.000000
>> 9:  0.414250, -0.414250, -1.000000
>> 10:  0.414250, -1.000000, -0.414250
>> 11:  0.414250, -1.000000, 0.414250
>> 12:  0.414250, -0.414250, 1.000000
>>
>> Thanks for your help
>> Kevin
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