Hi Anastasia and freesurfers,
I have more questions regarding SNR on DTI data.
I masked the low-b images by the white matter label (aseg), then calculated the
SNR ( mean / standard deviation within the label).
The mean values ranged for 250-350 across subjects, and the sd ranged for
60-140
Hi Yuko - As long as you define in your paper how you calculated SNR,
you'll be fine reporting these values.
a.y
On Mon, 7 Apr 2014, Yuko Yotsumoto wrote:
Hi Anastasia and freesurfers,
I have more questions regarding SNR on DTI data.
I masked the low-b images by the white matter label
Hello Freesurfers,
I have DTI data for two groups of subjects, and were asked SNR for each group.
I did ROI analysis on FA values, therefore, I do not have the averaged DTI
data.
I am wondering if there is any way to compute SNR from dt_recon output. It
doesn't have to be the ROI specific SNR
Hi Yuko - You can use the low-b images and compute the SNR of those images
inside a mask of the white matter. Because dt_recon computes a
registration from the diffusion to the structural data, you can use that
registration to map the white matter label from the freesurfer
segmentation
Signal-to-noise ratio = mean / standard deviation
On Tue, 18 Mar 2014, Yuko Yotsumoto wrote:
Anastasia,
Thank you so much for your reply.
So I should calculate the mean and s.d. of the values of the low-b within the
white matter region for each subject, and compare those numbers between
