[Mristudio-users] question on DTI protocol

[susumu]

When you are talking about matrix size (128 or 256), do you mean the actual
acquired data size is 128 and just interpolated to 256? Or do you want real
256 data acquisition?

I would suggest data acquisition of 96 (with 240 mm FOV, 2.5 mm resolution)
or 128 (with 256 mm FOV, 2 mm resolution), interpolated to 192 or 256.

Real data acquisition of 256 is too much for DTI.

Remember, we use single-shot EPI. After 96-128 echoes, there is not much
signal left anymore. There is no point to keep sampling the noise. More data
points (like 256) just give us more distortion without real gain of
resolution.

Also, gap should be 0.

Anyway I would suggest first figuring out if you are dealing with
interpolated 256 or real 256 datapoints.

-----Original Message-----
From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Hyunmi Kim, M.D.
Sent: Wednesday, May 21, 2008 4:54 PM
To: DTI Studio, ROI Editor,Landmarker Questions/Support
Subject: Re: [Mristudio-users] question on DTI protocol

Dear sir/madam;

I am on the way improving DTI protocol. 
We would like to have matrix scan reconstruction 256 and 3mm slice
thickness without gap.
When MRI tech tried to change it, We have to choose only one of the
below;
matrix scan reconstruction 128 and "0" gap OR
matrix scan reconstruction 256 and "1" mm gap.
Most our patients have epilepsy.
Which parameter, do you think, is more important?

Thank you for your help.

Hyunmi Kim, MD, PhD
Assistant Professor
Division of Pediatric Neurology

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