Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
Hi Gabriele,
what are you trying to accomplish? The "right choice" depends on your goals.
cheers Bruce On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
Hi Bruce,
I've a list of intra cerebral electrodes channel position segmented out from the MRI scans. I would like to convert the computed positions from the MRI scanner space to freesurfer vertexes. I've already transformed the coordinates of each point from indexes to Cartesian Space values (in the scanner RAS space). I'm looking to find which is the right surface to use the inflated or the pial surface to compute the nearest vertex for each point.
Does this short description clarify a little bit more my goal?
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele,
what are you trying to accomplish? The "right choice" depends on your goals.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
Hi Gabriele
inflated is definitely wrong as it has no meaning in the MRI coords. Any idea how deep the electrodes are? The white might be best as it will minimize the chances of erroneously assigning the electrode to the wrong bank of a sulcus.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi Bruce,
I've a list of intra cerebral electrodes channel position segmented out from the MRI scans. I would like to convert the computed positions from the MRI scanner space to freesurfer vertexes. I've already transformed the coordinates of each point from indexes to Cartesian Space values (in the scanner RAS space). I'm looking to find which is the right surface to use the inflated or the pial surface to compute the nearest vertex for each point.
Does this short description clarify a little bit more my goal?
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele,
what are you trying to accomplish? The "right choice" depends on your goals.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
The electrodes are quite long they're length vary from 10cm up to 15cm depends on the subject. they usually have been implanted quite deep in the brain.
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele
inflated is definitely wrong as it has no meaning in the MRI coords. Any idea how deep the electrodes are? The white might be best as it will minimize the chances of erroneously assigning the electrode to the wrong bank of a sulcus.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi Bruce,
I've a list of intra cerebral electrodes channel position segmented out from the MRI scans. I would like to convert the computed positions from the MRI scanner space to freesurfer vertexes. I've already transformed the coordinates of each point from indexes to Cartesian Space values (in the scanner RAS space). I'm looking to find which is the right surface to use the inflated or the pial surface to compute the nearest vertex for each point.
Does this short description clarify a little bit more my goal?
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele,
what are you trying to accomplish? The "right choice" depends on your goals.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
then the ?h.white is probably the way to go On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
The electrodes are quite long they're length vary from 10cm up to 15cm depends on the subject. they usually have been implanted quite deep in the brain.
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele
inflated is definitely wrong as it has no meaning in the MRI coords. Any idea how deep the electrodes are? The white might be best as it will minimize the chances of erroneously assigning the electrode to the wrong bank of a sulcus.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi Bruce,
I've a list of intra cerebral electrodes channel position segmented out from the MRI scans. I would like to convert the computed positions from the MRI scanner space to freesurfer vertexes. I've already transformed the coordinates of each point from indexes to Cartesian Space values (in the scanner RAS space). I'm looking to find which is the right surface to use the inflated or the pial surface to compute the nearest vertex for each point.
Does this short description clarify a little bit more my goal?
cheers,
g.
2011/1/25 Bruce Fischl fischl@nmr.mgh.harvard.edu
Hi Gabriele,
what are you trying to accomplish? The "right choice" depends on your goals.
cheers Bruce
On Tue, 25 Jan 2011, Gabriele Arnulfo wrote:
Hi again,
looking in previous emails in the list i found that the best way to find the nearest vertex number to a certain point is by using the matlab script mesh_vertex_nearest. So far I've used it with input parameters: the vertices read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. In this context I'd like to know which surface is the right choice, if there should be a choice. I've inserted either the pial and inflated surface having different result (vertex index) for the same point (RAS xyz).
Cheers,
g.
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
freesurfer@nmr.mgh.harvard.edu
-
Bruce Fischl -
Gabriele Arnulfo