Projects:SlicerFAQ:RegistrationMasking - Revision history

Grundlett: Text replacement - "http://www.slicer.org/slicerWiki/index.php/" to "https://www.slicer.org/wiki/"

2017-07-10T17:44:19Z

Text replacement - "http://www.slicer.org/slicerWiki/index.php/" to "https://www.slicer.org/wiki/"

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:34:31Z

What's the purpose of masking / VOI in registration?

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:34:00Z

What's the purpose of masking / VOI in registration?

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:31:18Z

What's the purpose of masking / VOI in registration?

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:30:41Z

What's the purpose of masking / VOI in registration?

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:29:45Z

What's the purpose of masking / VOI in registration?

Meier: /* What's the purpose of masking / VOI in registration? */

2010-11-16T16:27:12Z

What's the purpose of masking / VOI in registration?

Meier at 16:24, 16 November 2010

2010-11-16T16:24:51Z

Meier: Created page with 'What's the purpose of masking / VOI in registration?'

2010-11-16T16:14:20Z

Created page with 'What's the purpose of masking / VOI in registration?'

New page

What's the purpose of masking / VOI in registration?

@@ Line 6: / Line 6: @@
 *'''Note:''' masking within the registration is different from feeding a masked/stripped image as input, where areas of no interest have been erased. Such masking can still produce valuable results and is a viable option if the module in question does not provide a direct masking option. But direct masking by erasing portions of the image content can produce sharp edges that registration methods can lock onto. If the edge becomes dominant then the resulting registration will be only as good as the accuracy of the masking. That problem does not occur when using masking option within the module.
 *The following modules currently (v.3.6.1) provide masking:
-**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit '''BRAINSFit''']
+**[https://www.slicer.org/wiki/Modules:BRAINSFit '''BRAINSFit''']
 ***found under: ''Masking Options'' tab
 ***requires mask for both fixed and moving image
 ***has option to automatically generate masks
 ***some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
-**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImages-Documentation-3.6 '''Expert Automated Registration''']
+**[https://www.slicer.org/wiki/Modules:RegisterImages-Documentation-3.6 '''Expert Automated Registration''']
 ***found under: ''Advanced Registration Parameters'' tab
 ***requires mask for fixed image only
-**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImagesMultiRes-Documentation-3.6 '''Robust Multiresolution Affine''']
+**[https://www.slicer.org/wiki/Modules:RegisterImagesMultiRes-Documentation-3.6 '''Robust Multiresolution Affine''']
 ***found under: ''Optional'' tab
 ***requires mask for fixed image only
 ***provides option to define a mask as a box ROI
-**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSDemonWarp '''BRAINSDemonWarp''']
+**[https://www.slicer.org/wiki/Modules:BRAINSDemonWarp '''BRAINSDemonWarp''']
 ***found under: ''Mask Options'' tab
 ***requires mask for both fixed and moving image
 ***has option to automatically generate masks

@@ Line 5: / Line 5: @@
 *'''Explanation:''' The masking option is a very effective tool to focus the registration onto the image content that is most important. It is often the case that the  alignment of the two images is more important in some areas than others. ''Masking'' provides the opportunity to specify those regions and make the algorithm ignore the image content outside the mask. This does not mean that the rest is not registered, but rather that it moves along passively, i.e. areas outside the mask do not actively contribute to the cost function that determines the quality of the match. Note the mask defines the areas to ''include'', i.e. to exclude a particular region, build a mask that contains the entire object/image except that region.
 *'''Note:''' masking within the registration is different from feeding a masked/stripped image as input, where areas of no interest have been erased. Such masking can still produce valuable results and is a viable option if the module in question does not provide a direct masking option. But direct masking by erasing portions of the image content can produce sharp edges that registration methods can lock onto. If the edge becomes dominant then the resulting registration will be only as good as the accuracy of the masking. That problem does not occur when using masking option within the module.
-*The following modules provide masking:
+*The following modules currently (v.3.6.1) provide masking:
 **[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit '''BRAINSFit''']
 ***found under: ''Masking Options'' tab

@@ Line 7: / Line 7: @@
 *The following modules provide masking:
 **[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit '''BRAINSFit''']
 ***requires mask for both fixed and moving image
 ***has option to automatically generate masks
 ***some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
 **[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImages-Documentation-3.6 '''Expert Automated Registration''']
 ***requires mask for fixed image only
 **[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImagesMultiRes-Documentation-3.6 '''Robust Multiresolution Affine''']
 ***requires mask for fixed image only
 ***provides option to define a mask as a box ROI
 **[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSDemonWarp '''BRAINSDemonWarp''']

@@ Line 7: / Line 7: @@
 *The following modules provide masking:
 **[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit '''BRAINSFit''']
-****requires mask for both fixed and moving image
+***requires mask for both fixed and moving image
-****has option to automatically generate masks
+***has option to automatically generate masks
-****some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
+***some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
 **[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImages-Documentation-3.6 '''Expert Automated Registration''']
-****requires mask for fixed image only
+***requires mask for fixed image only
 **[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImagesMultiRes-Documentation-3.6 '''Robust Multiresolution Affine''']
-****requires mask for fixed image only
+***requires mask for fixed image only
-****provides option to define a mask as a box ROI
+***provides option to define a mask as a box ROI
 **[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSDemonWarp '''BRAINSDemonWarp''']

@@ Line 6: / Line 6: @@
 *'''Note:''' masking within the registration is different from feeding a masked/stripped image as input, where areas of no interest have been erased. Such masking can still produce valuable results and is a viable option if the module in question does not provide a direct masking option. But direct masking by erasing portions of the image content can produce sharp edges that registration methods can lock onto. If the edge becomes dominant then the resulting registration will be only as good as the accuracy of the masking. That problem does not occur when using masking option within the module.
 *The following modules provide masking:
-**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit BRAINSFit]
+**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSFit '''BRAINSFit''']
-***requires mask for both fixed and moving image
+****requires mask for both fixed and moving image
-***has option to automatically generate masks
+****has option to automatically generate masks
-***some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
+****some initialization modes (''CenterOfHeadAlign'') will not work in conjunction with masks
-**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImages-Documentation-3.6 Expert Automated Registration]
+**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImages-Documentation-3.6 '''Expert Automated Registration''']
-***requires mask for fixed image only
+****requires mask for fixed image only
-**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImagesMultiRes-Documentation-3.6 Robust Multiresolution Affine]
+**[http://www.slicer.org/slicerWiki/index.php/Modules:RegisterImagesMultiRes-Documentation-3.6 '''Robust Multiresolution Affine''']
-***requires mask for fixed image only
+****requires mask for fixed image only
-***provides option to define a mask as a box ROI
+****provides option to define a mask as a box ROI
-**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSDemonWarp BRAINS DemonWarp]
+**[http://www.slicer.org/slicerWiki/index.php/Modules:BRAINSDemonWarp '''BRAINSDemonWarp''']

← Older revision		Revision as of 16:24, 16 November 2010
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−	What's the purpose of masking / VOI in registration?	+	*[[Projects:SlicerFAQ\|back to Slicer FAQ]]
		+
		+	= What's the purpose of masking / VOI in registration? =
		+	*'''Problem:''' What does the masking option in some of the registration modules accomplish ?
		+	*'''Explanation:''' The masking option is a very effective tool to focus the registration onto the image content that is most important. It is often the case that the alignment of the two images is more important in some areas than others. ''Masking'' provides the opportunity to specify those regions and make the algorithm ignore the image content outside the mask. This does not mean that the rest is not registered, but rather that it moves along passively, i.e. areas outside the mask do not actively contribute to the cost function that determines the quality of the match. Note the mask defines the areas to ''include'', i.e. to exclude a particular region, build a mask that contains the entire object/image except that region.
		+	*'''Note:''' masking within the registration is different from feeding a masked/stripped image as input, where areas of no interest have been erased. Such masking can still produce valuable results and is a viable option if the module in question does not provide a direct masking option. But direct masking by erasing portions of the image content can produce sharp edges that registration methods can lock onto. If the edge becomes dominant then the resulting registration will be only as good as the accuracy of the masking. That problem does not occur when using masking option within the module.
		+	*The following modules provide masking:
		+	**BRAINSFit
		+	**Expert Automated
		+	**Robust Multiresolution Affine
		+	**BRAINS Demonwarp