John,
Thanks for your reply. Unfortunately, I think I do need to do the
segmentation. We are interested in some gray-white matter differences and feel
that segmentation would be the best way to answer our questions. It may be
possible to do what we want using a mask, but I'll have to think about this.
By the way, what losses will be incurred by entering a time series into the
segmentation?
Paul
John Ashburner wrote:
> Segmentation in SPM99 is designed to segment either a single image at
> a time, or to take a small number of images with different contrasts
> (eg. T2 and PD) and do a multispectral classification. I would suggest
> giving the program only one EPI image for each of your subjects, as there
> is very little to be gained (and lots to be lost) from entering a whole
> time series.
>
> Do you really need to do the segmentation?
>
> Best regards,
> -John
>
> | I hope you can help me with a problem I am having with segmentation. I
> | am attempting to segment a series of EPI images from one subject. I
> | choose:
> | segment
> | 1 subject
> | select the series of EPI images (84 images total)
> | are they normalized..yes
> | no inhomogeneity correction
> |
> | The program runs and segments the first image and then stops. It display
> | the segmented images in the graphic window and states "done" in the plot
> | window.
> |
> | I have tried selecting only 2 images and get the same results.
> | Furthermore, I downloaded the most recent spm_segment.m file from you
> | site but this did not fix the problem. DO you have any insight to this
> | problem. I would really appreciate your help or I will have to segment
> | each image separately. As you can imagine, this would be very time
> | consuming as I plan to do this for many subjects.
|