[MINC-users] Mritotal - how many parameters?

[Daniel Schwarz]

Dear minc-users,
 
I have a question which might be too elemental. However I will be happy for
any comments:
 
I am going to ask my colleagues-physicians to segment manually several
features from a set of brain images. I would like them to do it in the MNI
space with Display. Before that, I will do correction for INU artifact with
N3 and transformation into the MNI space with the use of ICBM152 template
and Mritotal. How many parameters of the transform should I use? If I
perform 7-parameter transform (the same scaling factor for x,y,z), I will
not have to worry about changing the proportions of the images and
computations of the featrue volumes will be very easy. Are there any
advantages when using 9-parameter transform? Is it better to use 9-parameter
transform and then recompute the feature volumes according to the various
scaling factors?
 
Thank you in advance
 
Daniel Schwarz