Dear Andrej,

The message is actually quite informative about the problem. SPM uses
routines for reading BTi data developed by Jan-Mathijs Schoffelen from
Glasgow. As said in the message there might be problem having to do
with the fact that your BTi sytem is different from his. It looks like
the conversion proceeds to the end but as you say the results are
incorrect. SPMs messages except for Jan-Mathijs's warnings are normal
and do not indicate a problem. I suggest that you get in touch with
Jan-Mathijs ([log in to unmask]) and ask for his help in
resolving the problem. Also if there are other BTi users on the list
who can help with resolving this problem I suggest that they contact
Jan-Mathijs with their suggestions.

Best,

Vladimir

On Wed, Jan 28, 2009 at 10:49 AM, Andrej Stancak
<[log in to unmask]> wrote:
> Dear SPM experts,
>
> I have tried to load our 4D MEG data set, that has 148 MEG sensors and 17
> non-MEG signals (=165), into SPM8b. After calling Convert from the GUI, I
> get a lengthy message (below) but what is worse, the number of channels read
> is wrong - it is 290 instead of the correct number 165. Also fiducials are
> not read (however, they are available in the header), and other information
> seems to be missing as well. I would be grateful for adjusting the reading
> of MEG data for 4D-148 sensors machine, if possible.
>
> Best regards
> Andrej Stancak
>
>
> Here is the message I get by calling Convert in SPM8b:
>
> Warning: reading in weight table: no warranty that this is correct. it seems
> to work for the
> Glasgow 248-magnetometer system. if you have some code yourself, and/or
> would like to test it
> on your own data, please contact Jan-Mathijs
>> In fileio\private\read_4d_hdr at 252
> In fileio\private\read_header at 474
> In fileio_read_header at 11
> In spm_eeg_convert at 73
> In spm_eeg_convert_ui at 81
> Warning: reading in weight table: no warranty that this is correct. it seems
> to work for the
> Glasgow 248-magnetometer system. if you have some code yourself, and/or
> would like to test it
> on your own data, please contact Jan-Mathijs
>> In fileio\private\read_4d_hdr at 252
> In fileio\private\read_header at 474
> In fileio\private\read_event at 426
> In fileio_read_event at 11
> In spm_eeg_convert at 95
> In spm_eeg_convert_ui at 81
> converting units from 'm' to 'mm'
> Warning: reading in weight table: no warranty that this is correct. it seems
> to work for
> the Glasgow 248-magnetometer system. if you have some code yourself, and/or
> would like to
> test it on your own data, please contact Jan-Mathijs
>> In fileio\private\read_4d_hdr at 252
> In fileio\private\read_header at 474
> In fileio\private\read_sens at 146
> In fileio\private\read_headshape at 144
> In fileio_read_headshape at 11
> In spm_eeg_convert at 398
> In spm_eeg_convert_ui at 81
> Warning: Could not obtain fiducials automatically.
>> In spm_eeg_convert at 400
> In spm_eeg_convert_ui at 81
> checkmeeg: no channel type, assigning default
> checkmeeg: no units, assigning default
> checkmeeg: transform type missing, assigning default
> checkmeeg: data scale missing, assigning default
> checkmeeg: data type is missing or incorrect, assigning default
> creating layout from cfg.grad
> creating layout for bti148 system
>