[Mristudio-users] (no subject)

[susumu mori]

This should give you some guidance about SNR:

1.5T:

2.5x2.5x2.5 mm / total 60 DWIs (e.g. 5 repetitions x 12 orientations, 2
repetitions x 30 orientations) should take about 8-9 min with 50-60 slices
to cover the entire brain. For example, you can use 96x96 matrix
(interpolated to 192x192 or 256x256) for 240x240 mm FOV is a good
combination. This gives a decent level of SNR.

About 30 DWIs (4 min) (e.g. 2 repetitions x 12 orientation or 1 x 30
orientations) give a bit weak SNR but maybe still usable. Anything lower
look noisy.

3.0T

2.2x2.2x2.2mm (e.g. 112x112 matrix (interpolated to 224x224 or 256x256) with
246x246 mm FOV should give a good SNR with 60DWIs (8-9 min). It is also
quite usable with 30DWIs (4 min). You maybe able to push the resolution to
2x2x2 (e.g. 112x112 matrix, 224x224 mm FOV) with 60DWIs with a modern head
coil.

For tracking, please see
https://www.mristudio.org/wiki/user_manual/DTI_Studio_User_Manual/fiber_tracking
.

On Wed, Jan 27, 2010 at 1:53 AM, smitha mahesh <mithamahesh at gmail.com>wrote:

> Sir,
>
> I am working on DTI studio. I am using Seimens mosaic images. When i
> processed the images using DTI studio, (FA, ADC,....) images i got contains
> lot of noise. How can i avoid this. Also when i did the fiber tractography
> the tracts are very short in length. What are your suggestions.
>
>
>
> --
> Smitha K A
> PhD Student
> Dept of Imaging Sciences and Technology
> Sree Chitra Tirunal Institute for Medical Sciences and Technology
> Trivandrum
> Kerala.
>
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