MEG Sensor Coordinate Files - Revision history

Jaehyun at 13:26, 5 May 2021

2021-05-05T13:26:23Z

Jaehyun at 15:49, 15 February 2019

2019-02-15T15:49:56Z

Jaehyun at 15:47, 15 February 2019

2019-02-15T15:47:53Z

Jaehyun at 08:16, 26 May 2017

2017-05-26T08:16:39Z

Robert at 14:06, 15 February 2017

2017-02-15T14:06:50Z

Harald at 15:07, 8 April 2016

2016-04-08T15:07:06Z

Robert: Initial creation of article

2016-04-08T14:25:31Z

Initial creation of article

New page

MEG sensor coordinate files can be used to define coordinates and positions of gradiometer and magnetometer sensors. Our convention is to save magnetometer information in *.pmg, and gradiometer information in *.pos files. In practice, the distinction between gradiometers and magnetometers is based on the number of values on each line in the file.

=== File Header ===
MEG sensor coordinate files do not require a file header.

=== Format ===
Every line in the files represent the coordinates for one sensor. Labels in these files are ignored.
* Magnetometers: consist of six coordinates per line (3x location, 3x orientation).
* Gradiometers: consit of nine coordinates per line (3x location of primary sensor, 3x location of secondary sensor, 3x orientation). The program decides whether gradiometers are planar or axial based on the distance between the primary and secondary sensor locations and the center of the head.

=== Examples ===

'''1.) Magnetometer A1 of a BTI recording system:'''<br>
-0.0019193 0.0304846 0.1081738 0.1188222 0.2394208 0.9636177

'''2.) Gradiometer of a Neuromag recording system:'''<br>
0.108510 -0.000143 -0.044954 0.108510 0.000463 -0.028766 0.999999 0.001450 0.000000

@@ Line 2: / Line 2: @@
 |title = Module information
 |module = BESA Research Basic MEG or higher
-|version = 5.2 or higher
+|version = BESA Research 5.2 or higher
 }}

@@ Line 5: / Line 5: @@
 }}
-MEG sensor coordinate files can be used to define coordinates and positions of gradiometer and magnetometer sensors. Our convention is to save magnetometer information in <span style="color:#ff9c00;">*.pmg</span>, and gradiometer information in <span style="color:#ff9c00;">*.pos</span> files (the units of positions is ''meter'', and the coordinate system is the ''head coordinates''). In practice, the distinction between gradiometers and magnetometers is based on the number of values on each line in the file.
+MEG sensor coordinate files can be used to define coordinates and positions of gradiometer and magnetometer sensors. Our convention is to save magnetometer information in <span style="color:#ff9c00;">*.pmg</span>, and gradiometer information in <span style="color:#ff9c00;">*.pos</span> files (the units of positions is ''meter'', and the [[Electrodes_and_Surface_Locations#Coordinate_systems | coordinate system]] is the ''head coordinates''). In practice, the distinction between gradiometers and magnetometers is based on the number of values on each line in the file.
 === File Header ===

@@ Line 5: / Line 5: @@
 }}
-MEG sensor coordinate files can be used to define coordinates and positions of gradiometer and magnetometer sensors. Our convention is to save magnetometer information in *.pmg, and gradiometer information in *.pos files. In practice, the distinction between gradiometers and magnetometers is based on the number of values on each line in the file.
+MEG sensor coordinate files can be used to define coordinates and positions of gradiometer and magnetometer sensors. Our convention is to save magnetometer information in <span style="color:#ff9c00;">*.pmg</span>, and gradiometer information in <span style="color:#ff9c00;">*.pos</span> files. In practice, the distinction between gradiometers and magnetometers is based on the number of values on each line in the file.
 === File Header ===
@@ Line 17: / Line 17: @@
 === Examples ===
-'''1.) Magnetometer A1 of a BTI recording system:'''<br>
+'''1) Magnetometer A1 of a BTI recording system:'''
--0.0019193 0.0304846 0.1081738 0.1188222 0.2394208 0.9636177
+<pre>-0.0019193 0.0304846 0.1081738 0.1188222 0.2394208 0.9636177</pre>
-'''2.) Gradiometer of a Neuromag recording system:'''<br>
+'''2) Gradiometer of a Neuromag recording system:'''
-.108510 -0.000143 -0.044954 0.108510 0.000463 -0.028766 0.999999 0.001450 0.000000
+<pre>0.108510 -0.000143 -0.044954 0.108510 0.000463 -0.028766 0.999999 0.001450 0.000000</pre>
 [[Category:Preprocessing]] [[Category:Data Import/Export]]

← Older revision		Revision as of 14:06, 15 February 2017
Line 23:		Line 23:
	0.108510 -0.000143 -0.044954 0.108510 0.000463 -0.028766 0.999999 0.001450 0.000000		0.108510 -0.000143 -0.044954 0.108510 0.000463 -0.028766 0.999999 0.001450 0.000000

−	[[Category:Preprocessing]]	+	[[Category:Preprocessing]] [[Category:Data Import/Export]]