Hi Greve, Only for age and surface area, no thickness or volume, is it right?

Thanks! Zheng

At 2017-11-26 03:04:26, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:

Yes, for age and surface area.

On 11/23/17 2:05 AM, 郑凤莲 wrote:

Hi professors,

I am using Qdec in Freesurfer. I want to study the relationships between age and cortical thickness, age and cortical volume, age and surface area. Is it necessary to corrected by eTIV for volume and surface area in Qdec? I am looking forward to your reply.

Thanks, Zheng

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

Hi Bruce, That is, I should set eTIV at Nuisance Factors for volume and surface area, not for thickness in qdec, is it right?

At 2017-11-27 10:22:05, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

you should correct for eTIV for volume (but not for thickness) On Mon, 27 Nov 2017, 郑凤莲 wrote:

...

Hi Greve, Only for age and surface area, no thickness or volume, is it right?

Thanks! Zheng

At 2017-11-26 03:04:26, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:

  Yes, for age and surface area.


  On 11/23/17 2:05 AM, 郑凤莲 wrote:
  Hi professors,

I am using Qdec in Freesurfer. I want to study the relationships between age and

cortical thickness, age and cortical volume, age and surface area. Is it necessary to corrected by eTIV for volume and surface area in Qdec? I am looking forward to your reply.

Thanks, Zheng

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

Hi Bruce,

Thanks for your help. But I have a doubt in why we should do in this way? Are there any principles or mechanisms in Qdec?

Sincerely, Zheng

At 2017-11-27 10:47:49, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

Yes

On Nov 26, 2017, at 9:40 PM, 郑凤莲 13181786167@163.com wrote:

Hi Bruce, That is, I should set eTIV at Nuisance Factors for volume and surface area, not for thickness in qdec, is it right?

<qdec.PNG>

At 2017-11-27 10:22:05, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

you should correct for eTIV for volume (but not for thickness) On Mon, 27 Nov 2017, 郑凤莲 wrote:

...

Hi Greve, Only for age and surface area, no thickness or volume, is it right?

Thanks! Zheng

At 2017-11-26 03:04:26, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:

  Yes, for age and surface area.


  On 11/23/17 2:05 AM, 郑凤莲 wrote:
  Hi professors,

I am using Qdec in Freesurfer. I want to study the relationships between age and

cortical thickness, age and cortical volume, age and surface area. Is it necessary to corrected by eTIV for volume and surface area in Qdec? I am looking forward to your reply.

Thanks, Zheng

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

I get it. Thank you very much. Best, Zheng

At 2017-11-27 11:46:46, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

It’s because people have found empirically that surface area and volume are correlated with TIV, but thickness is not cheers Bruce On Nov 26, 2017, at 9:54 PM, 郑凤莲 13181786167@163.com wrote:

Hi Bruce,

Thanks for your help. But I have a doubt in why we should do in this way? Are there any principles or mechanisms in Qdec?

Sincerely, Zheng

At 2017-11-27 10:47:49, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

Yes

On Nov 26, 2017, at 9:40 PM, 郑凤莲 13181786167@163.com wrote:

Hi Bruce, That is, I should set eTIV at Nuisance Factors for volume and surface area, not for thickness in qdec, is it right?

<qdec.PNG>

At 2017-11-27 10:22:05, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:

you should correct for eTIV for volume (but not for thickness) On Mon, 27 Nov 2017, 郑凤莲 wrote:

...

Hi Greve, Only for age and surface area, no thickness or volume, is it right?

Thanks! Zheng

At 2017-11-26 03:04:26, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:

  Yes, for age and surface area.


  On 11/23/17 2:05 AM, 郑凤莲 wrote:
  Hi professors,

I am using Qdec in Freesurfer. I want to study the relationships between age and

cortical thickness, age and cortical volume, age and surface area. Is it necessary to corrected by eTIV for volume and surface area in Qdec? I am looking forward to your reply.

Thanks, Zheng

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer