[Mristudio-users] Are calculated resluts influenced by the order of stored images in .REC?

[钱文枢]

Dear Prof. Mori,

With your suggestion, I have figured this problem out. The order of the
images is not the same as the former gradient table, but with b0 images
first. Thank you!


Regards,
Wenshu


2010/2/8 susumu mori <susumu at mri.jhu.edu>

> Hi Wenshu,
>
> In old days, Philips scanners were saving DTI data in slice-by-slice but I
> thought the current REC files are gradient-by-gradient order. Anyway, it
> seems that you can control the way images are saved in a REC file. Please
> make sure that the locations of the b0 image (either the first or the second
> from the last) is also correct.
>
> Please read the images by Mri3DView first and make sure that the order of
> the images is the same of your gradient table. If the images are read
> correctly and the order matches to the gradient table, there is no reason
> that you can't get the same quality of images.
>
> Another possibility is the quality of your data. Please make sure that your
> subject didn't move. If you acquired multiple REC files, you can create
> subtracted images to quickly check the subject motion.
>
> Susumu
>
>   On Mon, Feb 8, 2010 at 3:25 AM, 钱文枢 <qianwenshu at gmail.com> wrote:
>
>>   Hi, all
>>
>> I have used DTIStudio to calculate tensor index. The former order of
>> stored images in .REC file is "gradient by gradient", every result is OK.
>> The latest two patients' data has been saved as "slice by slice". Though I
>> chose "slice by slice" when input data, the calculated tensor index were all
>> blurry. I wanna know if the resluts will be influenced by the order of
>> stored images in .REC or the blur is just caused by other effects such as
>> movements.
>> Did anyone have the same problem?
>>
>> Thank you!
>>
>>
>> Regards,
>> Wenshu Qian
>>
>> Department of Diagnostic Radiology
>> The University of Hong Kong
>>
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