Hi, How should I have the distance between two points in mm? If I use the ?h.sphere, as all the spherical surfaces are normalized to have 100 radius. so the geodesic distances should not be the real distance in mm?
Fariba
__________________________________________________ Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
__________________________________________________ Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
__________________________________________________ Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
__________________________________________________ Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
Hi Fariba,
you can scale the sphere to have the same surface area as the ?h.white, then use great circles on it. cheers Bruce
On Mon, 11 Apr 2011, Fariba Sharifian wrote:
Hi, How should I have the distance between two points in mm? If I use the ?h.sphere, as all the spherical surfaces are normalized to have 100 radius. so the geodesic distances should not be the real distance in mm?
Fariba
Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
Fariba Sharifian, PhD Student.
Vision Systems Physiology group, Brain research unit
Low Temperature Laboratory and AMI centre Aalto University School of Science and Technology PO BOX 13000, FI-00076 Aalto Espoo, Finland
tel: +358-9-470 26159 fax: +358-9-470 22969
e-mail:fariba@neuro.hut.fi http://ltl.tkk.fi/wiki/BRU/Vision_Systems_Physiology
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On 4/11/11 09:36 , Fariba Sharifian wrote:
Hi, How should I have the distance between two points in mm? If I use the ?h.sphere, as all the spherical surfaces are normalized to have 100 radius. so the geodesic distances should not be the real distance in mm?
Fariba
Another way is to use 'mris_pmake'. In fact, this came up on the 1st April and was answered on the list. I'll repeat it here:
This question comes up sometimes -- and the short answer is 'yes', there is a tool that can allow you to do this. Although it will be available in the next version of FS (5.1), it is still a bit rough around the edges. It is called 'mris_pmake' and to use it to determine the distance between two points, do:
mris_pmake --subject <subject> --hemi -<hemi> --surface0 <surface> --curv0 sulc --curv1 sulc --mpmOverlay euclidean --mpmProg pathFind --mpmArgs startVertex:<startArg>,endVertex:<endArg>
So, if you have a subject called 'ID1' and want to determine the shortest distance along the surface between vertex 11111 and vertex 33333 on the left hemisphere smoothwm, do:
mris_pmake --subject ID1 --hemi lh --surface0 smoothwm --curv0 sulc --curv1 sulc --mpmOverlay euclidean --mpmProg pathFind --mpmArgs startVertex:11111,endVertex:33333
Note, that this is *not* the geodesic, but is very close. The path is constrained to run along the surface mesh, so will in general be slightly longer than the geodesic.
freesurfer@nmr.mgh.harvard.edu
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Bruce Fischl -
Fariba Sharifian -
Rudolph Pienaar