# using phantom data

**URL:** <https://mne.discourse.group/t/using-phantom-data/278>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [December 9, 2010, 11:56am UTC](https://mne.discourse.group/t/using-phantom-data/278 "2010-12-09T11:56:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [December 9, 2010, 11:56am UTC](https://mne.discourse.group/t/using-phantom-data/278/1 "2010-12-09T11:56:09Z")

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Hi all,

I am working on testing source-analysis with minimum-norm estimate in  
FieldTrip. I would like to compare the results with MNE Suite. For the  
comparison, I am using a phantom (MEG) dataset, and I would like to use  
a spherical volume conductor model (r=10 cm, origin at [0 0 0],  
conductivity = 1) and a surface at [0 0 7] with .5 (cm) spacing.

I am wondering if I could get any help to create this spherical volume  
conductor and the simple surface that it is in the appropriate format  
for MNE Suite.

Thank you for any help.

Best,  
Lilla Magyari

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [December 15, 2010, 8:00pm UTC](https://mne.discourse.group/t/using-phantom-data/278/2 "2010-12-15T20:00:39Z")

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Hi all,

Maybe someone will be interested later in the answer for my question.  
I have realized that it is possible to create a volumetric or discrete  
source space of arbitrary located source points, and to create bem  
meshes from ascii files with the mne\_volume\_source\_space and  
mne\_surf2bem utilities. They are described in the tutorial. Sorry for  
the unnecessary posting.

Best,  
Lilla Magyari

Magyari, Lilla wrote:

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [December 15, 2010, 8:10pm UTC](https://mne.discourse.group/t/using-phantom-data/278/3 "2010-12-15T20:10:54Z")

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> Hi all,
> 
> Maybe someone will be interested later in the answer for my question.  
> I have realized that it is possible to create a volumetric or discrete  
> source space of arbitrary located source points, and to create bem  
> meshes from ascii files with the mne\_volume\_source\_space and  
> mne\_surf2bem utilities. They are described in the tutorial. Sorry for  
> the unnecessary posting.

Hi Lilla,

Also, note that you can readily use the spherically symmetric  
conductor model in the forward calculation by using  
mne\_forward\_solution directly rather than the mne\_do\_forward\_solution  
wrapper script.

Unfortunately, there are no volume data visualization tools in MNE.  
You need to use the FreeSurfer tools for this.

- Matti