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+ | ===== FT_READ_SENS ===== | ||
+ | |||
+ | Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_read_sens". | ||
+ | |||
+ | <html><pre> | ||
+ | <a href=/reference/ft_read_sens><font color=green>FT_READ_SENS</font></a> read sensor positions from various manufacturer specific files. See | ||
+ | further down for the list of file types that are supported. | ||
+ | |||
+ | Use as | ||
+ | grad = ft_read_sens(filename, ...) % for gradiometers | ||
+ | elec = ft_read_sens(filename, ...) % for electrodes | ||
+ | |||
+ | Additional options should be specified in key-value pairs and can be | ||
+ | 'fileformat' = string, see the list of supported file formats (the default is determined automatically) | ||
+ | 'senstype' = string, can be 'eeg' or 'meg', specifies which type of sensors to read from the file (default = 'eeg') | ||
+ | 'coordsys' = string, 'head' or 'dewar' (default = 'head') | ||
+ | 'coilaccuracy' = can be empty or a number (0, 1 or 2) to specify the accuracy (default = []) | ||
+ | |||
+ | An electrode definition contain the following fields | ||
+ | elec.elecpos = Nx3 matrix with carthesian (x,y,z) coordinates of each | ||
+ | electrode | ||
+ | elec.label = cell-array of length N with the label of each electrode | ||
+ | elec.chanpos = Nx3 matrix with coordinates of each sensor | ||
+ | |||
+ | A gradiometer definition generally consists of multiple coils per channel, e.g. two | ||
+ | coils for a 1st order gradiometer in which the orientation of the coils is | ||
+ | opposite. Each coil is described separately and a large "tra" matrix has to be | ||
+ | given that defines how the forward computed field is combined over the coils to | ||
+ | generate the output of each channel. The gradiometer definition constsis of the | ||
+ | following fields | ||
+ | grad.coilpos = Mx3 matrix with the position of each coil | ||
+ | grad.coilori = Mx3 matrix with the orientation of each coil | ||
+ | grad.tra = NxM matrix with the weight of each coil into each channel | ||
+ | grad.label = cell-array of length N with the label of each of the channels | ||
+ | grad.chanpos = Nx3 matrix with the positions of each sensor | ||
+ | |||
+ | Files from the following acquisition systems and analysis platforms file formats | ||
+ | are supported. | ||
+ | |||
+ | asa_elc besa_elp besa_pos besa_sfp yokogawa_ave yokogawa_con yokogawa_raw 4d | ||
+ | 4d_pdf 4d_m4d 4d_xyz ctf_ds ctf_res4 itab_raw itab_mhd netmeg neuromag_fif | ||
+ | neuromag_mne neuromag_mne_elec neuromag_mne_grad polhemus_fil polhemus_pos | ||
+ | zebris_sfp spmeeg_mat eeglab_set localite_pos artiins_oxy3 matlab | ||
+ | |||
+ | See also <a href=/reference/ft_read_header><font color=green>FT_READ_HEADER</font></a>, <a href=/reference/ft_transform_sens><font color=green>FT_TRANSFORM_SENS</font></a>, <a href=/reference/ft_prepare_vol_sens><font color=green>FT_PREPARE_VOL_SENS</font></a>, <a href=/reference/ft_compute_leadfield><font color=green>FT_COMPUTE_LEADFIELD</font></a>, | ||
+ | <a href=/reference/ft_datatype_sens><font color=green>FT_DATATYPE_SENS</font></a> | ||
+ | </pre></html> | ||