Re: [HCP-Users] Some columns in the Movement_Regressors.txt are zeros

[Burgess, Gregory]

Hi Manasij,

We’ve discussed this in some detail with the folks at FMRIB. They have long 
known that the cost function in FLIRT (and MCFLIRT) is biased toward zero for 
very small motions. However, when the movement regressors have long series of 
zeroes, the motion corrected time series does not appear visually to have 
residual uncorrected motion. So, that has reassured us that the motion 
correction algorithm is working despite those long series of zeroes in the 
movement regressors.

--Greg


Greg Burgess, Ph.D.
Senior Scientist, Human Connectome Project
Washington University School of Medicine
Department of Psychiatry
Phone: 314-362-7864
Email: gburg...@wustl.edu

On Dec 18, 2018, at 6:01 PM, Glasser, Matthew 
mailto:glass...@wustl.edu>> wrote:

I think that just means there wasn’t much movement in that rotation direction.

Matt.

From: 
mailto:hcp-users-boun...@humanconnectome.org>>
 on behalf of Manasij Venkatesh mailto:mana...@umd.edu>>
Date: Tuesday, December 18, 2018 at 12:06 PM
To: "hcp-users@humanconnectome.org" 
mailto:hcp-users@humanconnectome.org>>
Subject: [HCP-Users] Some columns in the Movement_Regressors.txt are zeros

I've come across this a few times so I thought I'd report it. Column 6 and 12 
in the Movement_Regressors.txt is all zeros. An example of such a file is in 
414229\MNINonLinear\Results\tfMRI_LANGUAGE_RL

This usually creates problems if I use 3dDeconvolve for regressing out motion. 
Is this an issue with the movement file? If you know a work around, please let 
me know.

Sincerely,
Manasij
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Re: [HCP-Users] Some columns in the Movement_Regressors.txt are zeros

[Glasser, Matthew]

I think that just means there wasn’t much movement in that rotation direction.

Matt.

From: 
mailto:hcp-users-boun...@humanconnectome.org>>
 on behalf of Manasij Venkatesh mailto:mana...@umd.edu>>
Date: Tuesday, December 18, 2018 at 12:06 PM
To: "hcp-users@humanconnectome.org" 
mailto:hcp-users@humanconnectome.org>>
Subject: [HCP-Users] Some columns in the Movement_Regressors.txt are zeros

I've come across this a few times so I thought I'd report it. Column 6 and 12 
in the Movement_Regressors.txt is all zeros. An example of such a file is in 
414229\MNINonLinear\Results\tfMRI_LANGUAGE_RL

This usually creates problems if I use 3dDeconvolve for regressing out motion. 
Is this an issue with the movement file? If you know a work around, please let 
me know.

Sincerely,
Manasij

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The materials in this message are private and may contain Protected Healthcare 
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intended recipient, be advised that any unauthorized use, disclosure, copying 
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strictly prohibited. If you have received this email in error, please 
immediately notify the sender via telephone or return mail.

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