This should give you some guidance about SNR:<br><br>1.5T:<br><br>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.<br>
<br>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.<br><br>3.0T<br><br>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.<br>
<br>For tracking, please see <a href="https://www.mristudio.org/wiki/user_manual/DTI_Studio_User_Manual/fiber_tracking">https://www.mristudio.org/wiki/user_manual/DTI_Studio_User_Manual/fiber_tracking</a>.<br><br><div class="gmail_quote">
On Wed, Jan 27, 2010 at 1:53 AM, smitha mahesh <span dir="ltr"><<a href="mailto:mithamahesh@gmail.com">mithamahesh@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>Sir,</div>
<div> </div>
<div>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.<br clear="all">
<br><br clear="all"><br>-- <br>Smitha K A<br>PhD Student<br>Dept of Imaging Sciences and Technology<br>Sree Chitra Tirunal Institute for Medical Sciences and Technology<br>Trivandrum<br>Kerala.<br></div>
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