[Mristudio-users] 2d rois

[Susumu Mori]

For quantitative anatomical analysis, the manual delineation is treated as
the gold standard, against which the accuracy of automated methods are
measured. Therefore, there is no way to measure the accuracy of manual
delineation.

For manual delineation, we usually do not ask accuracy (validity), but ask
precision (reproducibility). Very often, reviewers ask data for test-retest
or inter-rater precision data. Therefore, manual delineation protocols are
important; you want to define anatomical areas where your structures of
interest can be defined easily with clear boundaries.

In this respect, I think that the pre-processing of images with the affine
transformation increases the precision. This is the "hybrid" approach
described in Fig. 1A of the attached paper. This approach, at least,
reduces the inter-rater variability to identify a slice level of interest
because the delineation protocol can explicitly say, "choose Axial slice
#90", for example.

Susumu


On Thu, Jan 30, 2014 at 7:11 AM, Shaimaa Abdelsattar
<shaimaa96 at hotmail.com>wrote:

> Hello experts,
> I have one question regarding the degree of accuracy of my data if i
> performed affine and trilinear normalization of my subjects to a template
> and then i manually drew a single 2 d roi (5 voxel)  on an anatomical
> structure e.g. left cerebral peduncle (trying to perform it in the  exact
> level and location in each patient )  to compare the resulting data among
> subjects.
> Can this approach give a valid data to rely on in comparison
>
> Thank you for your concern
> Shaimaa
> _______________________________________________
> mristudio-users mailing list
> mristudio-users at mristudio.org
> http://lists.mristudio.org/mailman/listinfo/
> Unsubscribe, send a blank email to:
> mristudio-users-unsubscribe at mristudio.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20140201/d601a9c5/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ICBM-DTI-81.pdf
Type: application/pdf
Size: 1319142 bytes
Desc: not available
Url : http://lists.mristudio.org/pipermail/mristudio-users/attachments/20140201/d601a9c5/attachment-0001.pdf