Marking AC-PC Points in BESA MRI - Revision history

Jaehyun at 13:26, 5 May 2021

2021-05-05T13:26:54Z

Jaehyun at 09:37, 5 September 2017

2017-09-05T09:37:56Z

Abinash: /* Marking the AC and PC points in BESA MRI */

2016-05-13T07:09:45Z

‎Marking the AC and PC points in BESA MRI

Abinash: /* Set Rotation */

2016-05-13T07:09:34Z

‎Set Rotation

Abinash: /* Marking the AC and PC points in BESA MRI */

2016-05-13T07:09:00Z

‎Marking the AC and PC points in BESA MRI

Abinash: /* Marking the AC and PC points in BESA MRI */

2016-05-13T07:03:28Z

‎Marking the AC and PC points in BESA MRI

Abinash at 14:49, 12 May 2016

2016-05-12T14:49:06Z

Abinash: /* Troubleshooting */

2016-05-12T14:43:15Z

‎Troubleshooting

Abinash: /* Troubleshooting */

2016-05-12T14:41:10Z

‎Troubleshooting

Abinash: /* Troubleshooting */

2016-05-12T14:40:52Z

‎Troubleshooting

@@ Line 2: / Line 2: @@
 |title = Module information
 |module = BESA MRI
-|version = 2.0 or higher
+|version = BESA MRI 2.0 or higher
 }}

@@ Line 5: / Line 5: @@
 }}
-In BESA MRI, the transformation of the original data into the ACPC coordinate system is defined by first marking the middle of the anterior commissure (AC). Then we rotate  the MR image to obtain an optimal view of the ACPC plane (PC=posterior commissure) and the best separation of both hemispheres by the sagittal plane. The marking of the PC completes the trasformation step.
+In BESA MRI, the transformation of the original data into the ACPC coordinate system is defined by first marking the middle of the anterior commissure (AC). Then we rotate  the MR image to obtain an optimal view of the ACPC plane (PC = posterior commissure) and the best separation of both hemispheres by the sagittal plane. The marking of the PC completes the transformation step.
-−
 == Marking the AC and PC points in BESA MRI ==
 [[File:AC.png|200px|thumb|right|Marking the AC in BESA MRI]] [[File:PC.png|200px|thumb|right|Marking the PC in BESA MRI]]
 A quick guide to locate the AC and PC in BESA MRI, on a structural MR image, is given below.
 === Anterior Commissure ===
 * Tra (1st window): middle of the inter-hemispheric connection
 * Cor (2nd window): middle of the “mustache” shape
 * Sag (3rd window): below the corpus callosum
 ===  Posterior Commissure ===
@@ Line 21: / Line 24: @@
 * Cor (2nd window): the inter-hemispheric connection can be seen
 * Sag (3rd window): above the cerebral aqueduct (visible even in low resolution)
 === Set Rotation ===
@@ Line 29: / Line 34: @@
 == Troubleshooting ==
-[[File:FTTscreen.png|300px|thumb|right|Shrinking caused due to mismarking in “Set Talairach Transformation” screen]]
-Mismarking of the AC PC points can cause the shrinking or expanding of the central brain regions during the trasformation process, which yeilds deformed Talairach-transformed 3D models of the brain. This can be avoided by carefully marking the AC and PC point as decribed before. The effect of mismarking can be also seen on the “Set Talairach Transformation” screen as shown. This might prove helpful in assesing the correctness of the AC-PC marking at an earlier stage.
+Mismarking of the AC and PC points can cause the shrinking or expanding of the central brain regions during the transformation process, which yields deformed Talairach-transformed 3D models of the brain. This can be avoided by carefully marking the AC and PC point as described before. The effect of mismarking can be also seen on the “Set Talairach Transformation” screen as shown. This might prove helpful in assessing the correctness of the AC-PC marking at an earlier stage.
-[[File:Deformed.png|200px|thumb|left|Shrinking, due to mismarking,visible in Talairach-transformed 3D models]]
 [[Category:MRI]]

@@ Line 21: / Line 21: @@
 * Cor (2nd window): the inter-hemispheric connection can be seen
 * Sag (3rd window): above the cerebral aqueduct (visible even in low resolution)
 === Set Rotation ===

@@ Line 23: / Line 23: @@
-== Set Rotation ==
+=== Set Rotation ===
 This step to is required to rotate the image accordingly such that
 * the PC midpoint appears on the cross-hair line behind the AC position and

@@ Line 23: / Line 23: @@
-''Set Rotation'' step to is required to rotate the image accordingly such that
+== Set Rotation ==
 * the PC midpoint appears on the cross-hair line behind the AC position and
 * the sagittal plane separates the two hemispheres optimally.

← Older revision		Revision as of 07:03, 13 May 2016
Line 23:		Line 23:


−	''Set Rotation'' step to is required to rotate the image accordingly such that a) the PC midpoint appears on the ~~crosshair~~ line behind the AC position and b) the sagittal plane separates the two hemispheres optimally. It is also ~~recomended~~ to increase or decrease the zoom factor accordingly, to better localize AC and PC.	+	''Set Rotation'' step to is required to rotate the image accordingly such that
		+	* the PC midpoint appears on the cross-hair line behind the AC position and
		+	* the sagittal plane separates the two hemispheres optimally.
		+	It is also recommended to increase or decrease the zoom factor accordingly, to better localize AC and PC.

	== Troubleshooting ==		== Troubleshooting ==

← Older revision		Revision as of 14:49, 12 May 2016
Line 29:		Line 29:
	Mismarking of the AC PC points can cause the shrinking or expanding of the central brain regions during the trasformation process, which yeilds deformed Talairach-transformed 3D models of the brain. This can be avoided by carefully marking the AC and PC point as decribed before. The effect of mismarking can be also seen on the “Set Talairach Transformation” screen as shown. This might prove helpful in assesing the correctness of the AC-PC marking at an earlier stage.		Mismarking of the AC PC points can cause the shrinking or expanding of the central brain regions during the trasformation process, which yeilds deformed Talairach-transformed 3D models of the brain. This can be avoided by carefully marking the AC and PC point as decribed before. The effect of mismarking can be also seen on the “Set Talairach Transformation” screen as shown. This might prove helpful in assesing the correctness of the AC-PC marking at an earlier stage.
	[[File:Deformed.png\|200px\|thumb\|left\|Shrinking, due to mismarking,visible in Talairach-transformed 3D models]]		[[File:Deformed.png\|200px\|thumb\|left\|Shrinking, due to mismarking,visible in Talairach-transformed 3D models]]
		+
		+	[[Category:MRI]]