Hi Mehul
writing as full floats should be fine, I didn't realize tkmedit rounded
Bruce
On Mon, 1 Jul 2013, Mehul Sampat wrote:
Thanks Bruce.
Okay will convert them from scanner RAS to surface RAS; last question: I
looked at the control points made from tkmedit;
it seems like you round of the co-ordinates to integers and then save them
as floats;
Does the co-ordinate information saved in control.dat need to be rounded
or is it okay to save floats in control.dat; ?
I also noticed the following difference between tkmedit and freeview;
if I make and save control points in tkmedit it says "useRealRAS 0"
while if i make and save control points in freeview it says "useRealRAS 1"
(here the co-ordinate info is not rounded off). Not sure if this could
affect the workflow but just wanted to let you know;
Thanks
Mehul
ps: In case, anyone needs to convert from scanner RAS to surface RAS; this
is how I am doing it in Matlab:
1. First read the vox2ras0 from MRIread and compute it's inverse.
2. Then do a matrix multiplication to get surface RAS. that is:
surface RAS = inv(vox2ras0) * scanner RAS;
Mehul
On Mon, Jul 1, 2013 at 12:51 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>
wrote:
1. Yes, I think so, although I wouldn't swear that everything is
smart enough to read this flag. You might be safer converting
them to surface ras and using them that way
2. Yes.
On Mon, 1 Jul 2013, Mehul Sampat wrote:
Thanks Bruce; Okay i assume, useRealRAS should be 1
for scanner RAS;
Two questions:
1. If my control points are in scanner RAS, then can
I use them directly as
long as I set
useRealRAS to 1 in the control.dat file ?
2. Can useRealRAS variable be only 0/1 or do you
have a different value for
surface RAS?
Thanks
Mehul
On Mon, Jul 1, 2013 at 12:13 PM, Bruce Fischl
<fis...@nmr.mgh.harvard.edu>
wrote:
Hi Mehul
they can either be in "real" (meaning scanner)
RAS or in surface
RAS
cheers
Bruce
On Mon, 1 Jul 2013, Mehul Sampat wrote:
Thanks Bruce; I noticed that in the
control.dat file
the second last line is
"useRealRAS 0"
just curious to know if info is used by
recon-all or
is only used by the
viewer ?
Thanks
Mehul
On Mon, Jul 1, 2013 at 11:34 AM, Bruce
Fischl
<fis...@nmr.mgh.harvard.edu>
wrote:
yes, they are stored in ras
On Mon, 1 Jul 2013, Mehul Sampat
wrote:
Hi Folks, Once we make
control points in
tkmedit,
they are stored in the
file control.dat
Are these control points
stored in RAS
co-ordinate
system ?
If not what is the
co-ordinate system
used to store
the control points
Thanks
Mehul
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