Re: [Freesurfer] Question regarding Qdec in Cortical thickness and Ventricular Volume Analysis
Thank you Douglas. For some reason your response was sent in a link to my first post but not the second...
I will be looking at the ventricular volume and cortical thickness separately for two different studies.
Should the data be smoothed to look at ventricular volume and cortical thickness or just cortical thickness? Also, Does Qdec need to be used to complete the analysis, or can I export the data into another statistical software?
Thank you in advance.
Best, Tamara
Message: 4 Date: Fri, 9 Jun 2017 12:47:06 -0400 From: Douglas N Greve greve@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Question regarding Qdec in Cortical thickness and Ventricular Volume Analysis To: freesurfer@nmr.mgh.harvard.edu Message-ID: 0689d6d2-1a15-f5f7-04d1-43e518625899@nmr.mgh.harvard.edu Content-Type: text/plain; charset=windows-1252; format=flowed
here it is again. The responses are embedded
On 06/09/2017 09:51 AM, Douglas Greve wrote:
The data does not necessarily need to be smoothed, but people
usually do because it improves stats. But I thought you were doing an ROI analysis based on the first question<br>
On 6/6/17 11:50 AM, Tamara Tavares wrote:
Hello,
I have ran my data through the default recon-all processing stream and am planning on analyzing ventricular volume and cortical thickness. I was wondering whether I need to use the Qdec to complete the ventricular volume and cortical thickness analysis, or can I export the data (txt files found in the stats folder) and complete the analysis on any statistical program such as SPSS or STATA?
you can export
I also noticed that Qdec needs to have the data smoothed before analyzing cortical thickness or other surface information. Why does the data need to be smoothed after being ran through recon-all and before analysis? Does the smoothing just need to occur if I am running the analysis via Qdec or do I need to complete the smoothing before analyzing the data on any statistical program?
The data does not necessarily need to be smoothed, but people usually do because it improves stats. But I thought you were doing an ROI analysis based on the first question
Thank you in advance for your help!
Best, Tamara
what do you mean "look at the ventricular volume"? What data would you smooth when doing that?
On 6/12/17 8:53 PM, Tamara Tavares wrote:
Thank you Douglas. For some reason your response was sent in a link to my first post but not the second...
I will be looking at the ventricular volume and cortical thickness separately for two different studies.
Should the data be smoothed to look at ventricular volume and cortical thickness or just cortical thickness? Also, Does Qdec need to be used to complete the analysis, or can I export the data into another statistical software?
Thank you in advance.
Best, Tamara
Message: 4 Date: Fri, 9 Jun 2017 12:47:06 -0400 From: Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> Subject: Re: [Freesurfer] Question regarding Qdec in Cortical thickness and Ventricular Volume Analysis To: freesurfer@nmr.mgh.harvard.edu mailto:freesurfer@nmr.mgh.harvard.edu Message-ID: <0689d6d2-1a15-f5f7-04d1-43e518625899@nmr.mgh.harvard.edu mailto:0689d6d2-1a15-f5f7-04d1-43e518625899@nmr.mgh.harvard.edu> Content-Type: text/plain; charset=windows-1252; format=flowed
here it is again. The responses are embedded
On 06/09/2017 09:51 AM, Douglas Greve wrote:
The data does not necessarily need to be smoothed, but people
usually do because it improves stats. But I thought you were doing an ROI analysis based on the first question<br>On 6/6/17 11:50 AM, Tamara Tavares wrote:
Hello,
I have ran my data through the default recon-all processing stream and am planning on analyzing ventricular volume and cortical thickness. I was wondering whether I need to use the Qdec to complete the ventricular volume and cortical thickness analysis, or can I export the data (txt files found in the stats folder) and complete the analysis on any statistical program such as SPSS or STATA?
you can export
I also noticed that Qdec needs to have the data smoothed before analyzing cortical thickness or other surface information. Why does the data need to be smoothed after being ran through recon-all and before analysis? Does the smoothing just need to occur if I am running the analysis via Qdec or do I need to complete the smoothing before analyzing the data on any statistical program?
The data does not necessarily need to be smoothed, but people usually do because it improves stats. But I thought you were doing an ROI analysis based on the first question
Thank you in advance for your help!
Best, Tamara
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Tamara Tavares