[Mristudio-users] Tensor calculation

[Santosh Yadav]

Dear Dr Hangyi,

Lot of thanks for great response.

I have another question regarding DTI processing.

I am processing the DTI data acquired from Siemens 3T for LDDMM, Is it
necessary/important step to do the Automatic image registration using a
12-mode affine transformation before tensor calculation?

As I read the articles, It is important step for motion and eddy current
distortion correction in the DTI data.

Ref.
1. Neuroimage 2009; 47(2): 618-627
2. Jiang H<http://www.ncbi.nlm.nih.gov/pubmed?term=Jiang%20H%5BAuthor%5D&cauthor=true&cauthor_uid=16413083>Comput
Methods Programs Biomed. 2006, 81(2):106-16


With Best Regards

Santosh



On Mon, Jun 25, 2012 at 4:50 AM, Hangyi Jiang <hjiang at jhmi.edu> wrote:

>
> there is no standard answer for your question, it depends on original
> dataset.  the following recommends are just for your reference:
>
> if your dataset has only few diffusion orientations (e.g. less than 8),
> you may try:
> manual image quality check + standard linear fitting or outlier pixel
> rejection method;
>
> if you have only few subjects to study, you way try:
> manual image quality check + standard linear fitting;
>
> if your dataset have a lot of DW orientations (e.g. more than 15), you can
> try:
> outlier slice rejection method;
>
> if you find motion artifact, you can  use AIR based method.
>
> and......
>
> best,
>
>
> hangyi
>
>
>
>
>
>
>  or outlier pixel rejection method;
>
>
> ________________________________
> From: mristudio-users-bounces at mristudio.org [
> mristudio-users-bounces at mristudio.org] on behalf of Santosh Yadav [
> santoshyadav20076 at gmail.com]
> Sent: Sunday, June 24, 2012 4:24 AM
> To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
> Subject: [Mristudio-users] Tensor calculation
>
> Hello DTI Experts,
>
> I want to know which method is good for tensor calculation using
> DTI-Studio for LDDMM.
>
> In DTI-Studio, for tensor calculation there are four methods:
>
> 1. Standard linear registration
> 2. Automatic outlier SLIC rejection
> 3. Automatic outlier pixel rejection method
> 4. AIR for theory-original DWI pair with using a 12-mode affine
> transformation (Woods et al., 1998)
>
> I read few articles which described the tensor calculation by using AIR
> for theory-original DWI pair Method (Method 4) (Neuroimage 2009; 47(2):
> 618-627, Neuroimage 2009; 46(2): 486-499), is this method having any
> advantage over Automatic outlier pixel rejection method?
>
> With Best Regards
>
>
> --
> With Best Regards,
>
> Neuroscience and MR Research Program
>
> Department of Medicine, Queen's Medical Center
>
> University of Hawaii
>
> 1356 Lusitana Street, 7th Floor, Honolulu, HI 96813
>
> Phone No. 808-220-7152
>
> Fax No.  808-545-8970
>
>
>
>


-- 
With Best Regards,

Neuroscience and MR Research Program

Department of Medicine, Queen's Medical Center

University of Hawaii

1356 Lusitana Street, 7th Floor, Honolulu, HI 96813

Phone No. 808-220-7152

Fax No.  808-545-8970
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