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===Boundaries for the ROI's, mainly using FA maps & color by orientation, followed by the color coding of the labelmaps.===
 
 
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'''NOTE: FORNIX LABELS UPDATED ON AUGUST 3rd.'''
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This page describes the definition of the regions of interest for five fiber bundles: the Internal Capsule, the Uncinate Fasciculus, the Fornix, the Arcuate Fasciculus and the Cingulum Bundle.[[Image:ColorPalette.png|thumb|right|300px|Color Palette]]
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Seed points were defined using a two ROIs approach. Each ROI was drawn on FA and color by orientation maps according to the criteria defined below:
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== Internal Capsule (IC) ==
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'''Connects thalamus with frontal lobe.  Involved in executive functions and working memory, both of these cognitive skills are abnormal in schizophrenia.'''
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Anterior limb of internal capsule, specifically interested in thalamocortical connections to frontal cortex.
  
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'''ROI1'''
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The inferior boundary of ROI1 was defined by an axial slice containing the anterior commisure (Fig.1).
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The left and right ROI1s were drawn on a coronal slice containing the anterior commisure, on each side of the midsagittal line (Fig.2). The superior boundary of each ROI1 was defined by the caudate/putamen line
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[[Image:InternalCapsule.jpg|thumb|right|300px|Internal Capsule]]
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[[Image:IC_axial.png|thumb|left|300px|Figure1. Axial View of the Anterior Commisure, which serves as the bottom boundary of ROI 1]]
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[[Image:IC_ROI1.png|thumb|left|300px|Figure 2. Coronal View of ROI 1 (left and right), showing the inferior boundary (in purple)]]
  
 
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'''ROI2'''
  
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The most anterior coronal slice of the corpus collosum was selected using a sagittal view (Fig 3), and the ROI2s were defined by the whole sections of the left and right hemispheres of the brain (Fig 4).
  
====IC - Internal Capsule====
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[[Image:InternalCapsuleROIs.png|thumb|left|300px|Figure 3.Internal Capsule ROI's 1 and 2 (left)]] [[Image:IC_ROI2.png|thumb|left|300px|Figure 4.Coronal View of ROI 2 (left and right)]]
ROI 1) find anterior commisure on axial view and draw ROI on coronal slice on each side on midsag line
 
<p>Top boundary for ROI 1: Caudate/putamen line</p>
 
<p>Bottom boundary for ROI 1: draw entire plane of AC; IC is only superior to AC line.</p>
 
<p>ROI 2) go to the anterior most point of the corpus collosum according to saggital view.  Draw ROI so it covers  entire (left or right) hemisphere of brain on the perpendicular Coronal Slice.</p>
 
 
 
::7= Left ROI 1
 
::11= Left ROI 2
 
:
 
::8= Right ROI 1
 
::12= Right ROI 2
 
:
 
::15= Inferior Boundary... do not track from this.
 
[[Image:InternalCapsuleROIs.png|thumb|left|300px|Internal Capsule ROI's 1 and 2 (left)]]|-
 
  
 
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====unc - Uncinate Fasciculus====
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The color coding of the resulting ROIs is as follows:
Find the most prominant (central) slice of the fornix according to saggital view.  Go one slice anterior to the most anterior point of the fornix and draw Left and Right ROI 1 and ROI 2.
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::ROI 1: Left(7) - Right(8)
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::ROI 2: Left(11) - Right(12)
  
::7= Left ROI 1
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==Uncinate Fasciculus (UNC)==
::11= Left ROI 2
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'''Connects temporal pole and orbito-frontal gyrus. Involved in episodic memory, verbal learning, and emotion.  Related to affective flattening and episodic memory dysfunctions in schizophrenia.'''  <br>
:
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[[Image:Uncinate.jpg|thumb|right|300px|Uncinate Fasciculus]]
::8= Right ROI 1
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The most prominant (central) slice of the fornix was identified using a sagittal view (Fig. 5), and the ROI1s and ROI2s were drawn on  the coronal slice adjacent to the most anterior point of the fornix (Fig. 6).
::12= Right ROI 2
 
  
<p> [[Image:UncinateROIs.png|thumb|left|300px|Uncinate Fasciculus ROI's 1 and 2 (left)]] </p>
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<p> [[Image:unc_fornROI.png|thumb|left|300px|Figure 5. Sagittal view of the fornix, located centrally in the brain]] [[Image:unc_ROIs.png|thumb|left|300px|Figure 6. Coronal View of ROI 1 and ROI 2, (left and right)]]</p>
  
 
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====Fornix====
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<p> [[Image:UncinateROIs.png|thumb|left|300px|Figure 7.Uncinate Fasciculus ROI's 1 and 2 (left)]] </p>
ROI 1) on Coronal view, the first slice where the middle cerebellar peduncles are present
 
<p>ROI 2) posterior to ROI 1; large blobs drawn on coronal view where the middle cerebellar peduncle is clearly connected at bottom of slice</p>
 
  
::7= ROI 1 for both Left and Right
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::11 or 13 = Left ROI 2
 
::12 or 14 = Right ROI 2
 
  
[[Image:Fornix1ROIs.png|left|thumb|300px|Fornix ROI 1 (both left and right)]] [[Image:Fornix2ROIs.png|left|thumb|300px|Fornix ROI 2 (right)]]
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The color coding of the resulting ROIs is as follows:
 +
::ROI 1: Left(7) - Right(8)
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::ROI 2: Left(11) - Right(12)
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==Fornix==
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'''Connects hippocampus with other brain regions (thalamus, prefrontal cortex).  Involved in spatial learning and memory.  Related to memory deficits in schizophrenia.'''
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[[Image:Fornix.jpg|thumb|right|300px|Fornix]]
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ROI 1 was drawn on the sagittal slice, 5 slices superior to the anterior commisure (Fig. 8 & 10).
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ROI 2 was drawn on a coronal slice where the crux of the fornix was present.  It was not always the same slice for both sides (Fig. 9 & 11).
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[[Image:ROI1_ax.png|left|thumb|300px|Figure 8. Axial View of ROI 1]][[Image:ROI2_cor.png|left|thumb|300px|Figure 9. Coronal View of ROI 2 (left=11, right=13)]]
  
 
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===Arcuate Fasciculus===
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[[Image:ROI1_sag.png|left|thumb|300px|Figure 10. Sagittal View of Fornix, ROI 1 (both left and right)]] [[Image:ROI2_sag.png|left|thumb|300px|Figure 11. Sagittal View of Fornix, ROI 2 (right)]]
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The color coding of the resulting ROIs is as follows:
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::ROI 1: Left & Right (7)
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::ROI 2: Left(8) - Right(6)
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==Arcuate Fasciculus==
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'''Connects Broca’s and Wernicke’s areas.  Involved in language processing.  Abnormalities here could be related to thought disorder and semantic processing disruptions that are hallmarks of schizophrenia.'''
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[[Image:Arcuate.jpg|thumb|right|300px|Arcuate Fasciculus]]
 
These labelmaps ('caseD00XXX-FS-arcuate-final.nhdr') were created using automatic gray matter parcellation in Freesurfer and coregistered in Slicer to corresponding DTI dataset.  The labelmaps were dilated in Slicer to increase coverage of gray matter.
 
These labelmaps ('caseD00XXX-FS-arcuate-final.nhdr') were created using automatic gray matter parcellation in Freesurfer and coregistered in Slicer to corresponding DTI dataset.  The labelmaps were dilated in Slicer to increase coverage of gray matter.
  
::5 = Left Superior Temporal Gyrus
 
::13 = Left Inferior Frontal Gyrus
 
:
 
::6 = Right Superior Temporal Gyrus
 
::14 = Right Inferior Frontal Gyrus
 
  
[[Image:Arcuate.png|thumb|left|300px|Gray matter ROI's for Arcuate Fasciculus tractography]] [[Image:Arcuate3d.png|thumb|left|300px|Gray matter ROIs (right side) in 3D]] [[Image:Arcuate.jpg|thumb|left|300px|Arcuate tractography]]
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[[Image:Arcuate.png|thumb|left|300px|Figure 12. Gray matter ROI's for Arcuate Fasciculus tractography]] [[Image:Arcuate3d.png|thumb|left|300px|Figure 13. Gray matter ROIs (right side) in 3D]]  
  
 
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====Cingulum Bundle====
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The color coding of the resulting ROIs is as follows:
ROI 1) on the superior side of the corpus, flush with the most anterior part of the corpus (based on sag view, but drawn on coronal view)
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::ROI 1: Superior Temporal Gyrus - Left(5) - Right(6)
<p>ROI 2) on the first coronal slice where the L & R corpus connect, on the superior side of the corpus.</p>
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::ROI 2:Inferior Frontal Gyrus- Left(13) - Right (14)
<p>ROI 3) on the first coronal slice where the L & R corpus connect, on the inferior side of the corpus.</p>
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<p>ROI 4) on the first coronal slice where the middle cerebellar peduncle is present.</p>
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'''Second generation ROI'''
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The ROIs were generated based on the FreeSurfer cortical parcellation, dilated to include the underlying white matter and mapped back into the DWI-Ed-EPI space:
 +
:: left side: source: Inferior Frontal Gyrus and Sulcus (label #2) ; sink: Superior Temporal Gyrus and Sulcus(label #7)
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:: right side: source: Inferior Frontal Gyrus and Sulcus (label #8); sink: Superior Temporal Gyrus and Sulcus (label #9 ).
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==Cingulum Bundle==
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'''Interconnects limbic structures (DLPFC, cingulate gyrus, parahippocampal gyrus).  Involved in attention, emotions, spatial orientation, memory.  Abnormalities here could be related to negative symptoms, hallucinations, memory and executive attentional deficits in schizophrenia.'''
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Tractography - 4 ROIs define
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Connectivity - Orbital frontal cortex to amygdala
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[[Image:Cingulum1.jpg|thumb|right|300px|Cingulum]]
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'''ROI 1)''' A coronal plane in the most anterior point of the corpus callosum was selected using the mid-saggital plane (Fig.18), and the left and right ROI1s were drawn on the superior side of the corpus callosum (Fig.15)
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 +
'''ROI 2) & ROI 3)''' The first coronal slice where the left and right corpus connect was selected: the left and right ROI2s were drawn on the superior side of the corpus and the left and right ROI3s were drawn on the inferior side of the corpus (Fig. 16 & 18)  
  
::7= Left ROI 1
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'''ROI 4)''' The first coronal slice showing where the middle cerebellar peduncle was slected, and the left and right ROI4s were drawn(Fig. 17 & 19)
::9= Left ROI 2
 
::11= Left ROI 3
 
::13= Left ROI 4
 
  
::8= Right ROI 1
 
::16= Right ROI 2
 
::12= Right ROI 3
 
::14= Right ROI 4
 
  
[[Image:Cing1ROIs.png|left|thumb|300px|Cingulum Bundle ROI's 1, 2, and 3]] [[Image:Cing2ROIs.png|left|thumb|300px|Cingulum Bundle ROI 4]]
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[[Image:cing_roi1.png|left|thumb|300px|Figure 15. Coronal View of Cingulum Bundle ROI 1, Left and Right]] [[Image:cing_roi23.png|left|thumb|300px|Figure 16. Coronal View of Cingulum Bundle ROI's 2 & 3, left and right]][[Image:cing_roi4.png|left|thumb|300px|Figure 17. Coronal View of Cingulum Bundle ROI 4, left and right]]
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[[Image:Cing1ROIs.png|left|thumb|300px|Figure 18. Cingulum Bundle ROI's 1, 2, and 3]] [[Image:Cing2ROIs.png|left|thumb|300px|Figure 19. Cingulum Bundle ROI 4]]
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The color coding of the resulting ROIs is as follows:
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::ROI 1: Left(7) - Right(8)
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::ROI 2: Left(9) - Right(16)
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::ROI 3: Left(11) - Right(12)
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::ROI 4: Left(13) - Right(14)
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== Return to ==
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Return to [[Projects/Diffusion/2007_Project_Week_Contrasting_Tractography_Measures | Contrasting Tractography Project page]]
[[Projects/Diffusion/2007_Project_Week_Contrasting_Tractography_Measures | Contrasting Tractography Project page]]
 

Latest revision as of 20:40, 11 April 2023

Home < Projects < Diffusion < 2007 Project Week Contrasting Tractography Measures < ROI Definitions


NOTE: FORNIX LABELS UPDATED ON AUGUST 3rd.

This page describes the definition of the regions of interest for five fiber bundles: the Internal Capsule, the Uncinate Fasciculus, the Fornix, the Arcuate Fasciculus and the Cingulum Bundle.
Color Palette

Seed points were defined using a two ROIs approach. Each ROI was drawn on FA and color by orientation maps according to the criteria defined below:

Internal Capsule (IC)

Connects thalamus with frontal lobe. Involved in executive functions and working memory, both of these cognitive skills are abnormal in schizophrenia.

Anterior limb of internal capsule, specifically interested in thalamocortical connections to frontal cortex.

ROI1

The inferior boundary of ROI1 was defined by an axial slice containing the anterior commisure (Fig.1).

The left and right ROI1s were drawn on a coronal slice containing the anterior commisure, on each side of the midsagittal line (Fig.2). The superior boundary of each ROI1 was defined by the caudate/putamen line

Internal Capsule
Figure1. Axial View of the Anterior Commisure, which serves as the bottom boundary of ROI 1
Figure 2. Coronal View of ROI 1 (left and right), showing the inferior boundary (in purple)

ROI2

The most anterior coronal slice of the corpus collosum was selected using a sagittal view (Fig 3), and the ROI2s were defined by the whole sections of the left and right hemispheres of the brain (Fig 4).

Figure 3.Internal Capsule ROI's 1 and 2 (left)
Figure 4.Coronal View of ROI 2 (left and right)

The color coding of the resulting ROIs is as follows:

ROI 1: Left(7) - Right(8)
ROI 2: Left(11) - Right(12)

Uncinate Fasciculus (UNC)

Connects temporal pole and orbito-frontal gyrus. Involved in episodic memory, verbal learning, and emotion. Related to affective flattening and episodic memory dysfunctions in schizophrenia.

Uncinate Fasciculus

The most prominant (central) slice of the fornix was identified using a sagittal view (Fig. 5), and the ROI1s and ROI2s were drawn on the coronal slice adjacent to the most anterior point of the fornix (Fig. 6).

Figure 5. Sagittal view of the fornix, located centrally in the brain
Figure 6. Coronal View of ROI 1 and ROI 2, (left and right)

Figure 7.Uncinate Fasciculus ROI's 1 and 2 (left)

The color coding of the resulting ROIs is as follows:

ROI 1: Left(7) - Right(8)
ROI 2: Left(11) - Right(12)

Fornix

Connects hippocampus with other brain regions (thalamus, prefrontal cortex). Involved in spatial learning and memory. Related to memory deficits in schizophrenia.

Fornix

ROI 1 was drawn on the sagittal slice, 5 slices superior to the anterior commisure (Fig. 8 & 10). ROI 2 was drawn on a coronal slice where the crux of the fornix was present. It was not always the same slice for both sides (Fig. 9 & 11).


Figure 8. Axial View of ROI 1
Figure 9. Coronal View of ROI 2 (left=11, right=13)
Figure 10. Sagittal View of Fornix, ROI 1 (both left and right)
Figure 11. Sagittal View of Fornix, ROI 2 (right)

The color coding of the resulting ROIs is as follows:

ROI 1: Left & Right (7)
ROI 2: Left(8) - Right(6)

Arcuate Fasciculus

Connects Broca’s and Wernicke’s areas. Involved in language processing. Abnormalities here could be related to thought disorder and semantic processing disruptions that are hallmarks of schizophrenia.

Arcuate Fasciculus

These labelmaps ('caseD00XXX-FS-arcuate-final.nhdr') were created using automatic gray matter parcellation in Freesurfer and coregistered in Slicer to corresponding DTI dataset. The labelmaps were dilated in Slicer to increase coverage of gray matter.


Figure 12. Gray matter ROI's for Arcuate Fasciculus tractography
Figure 13. Gray matter ROIs (right side) in 3D

The color coding of the resulting ROIs is as follows:

ROI 1: Superior Temporal Gyrus - Left(5) - Right(6)
ROI 2:Inferior Frontal Gyrus- Left(13) - Right (14)

Second generation ROI

The ROIs were generated based on the FreeSurfer cortical parcellation, dilated to include the underlying white matter and mapped back into the DWI-Ed-EPI space:

left side: source: Inferior Frontal Gyrus and Sulcus (label #2) ; sink: Superior Temporal Gyrus and Sulcus(label #7)
right side: source: Inferior Frontal Gyrus and Sulcus (label #8); sink: Superior Temporal Gyrus and Sulcus (label #9 ).

Cingulum Bundle

Interconnects limbic structures (DLPFC, cingulate gyrus, parahippocampal gyrus). Involved in attention, emotions, spatial orientation, memory. Abnormalities here could be related to negative symptoms, hallucinations, memory and executive attentional deficits in schizophrenia.

Tractography - 4 ROIs define Connectivity - Orbital frontal cortex to amygdala

Cingulum

ROI 1) A coronal plane in the most anterior point of the corpus callosum was selected using the mid-saggital plane (Fig.18), and the left and right ROI1s were drawn on the superior side of the corpus callosum (Fig.15)

ROI 2) & ROI 3) The first coronal slice where the left and right corpus connect was selected: the left and right ROI2s were drawn on the superior side of the corpus and the left and right ROI3s were drawn on the inferior side of the corpus (Fig. 16 & 18)

ROI 4) The first coronal slice showing where the middle cerebellar peduncle was slected, and the left and right ROI4s were drawn(Fig. 17 & 19)


Figure 15. Coronal View of Cingulum Bundle ROI 1, Left and Right
Figure 16. Coronal View of Cingulum Bundle ROI's 2 & 3, left and right
Figure 17. Coronal View of Cingulum Bundle ROI 4, left and right
Figure 18. Cingulum Bundle ROI's 1, 2, and 3
Figure 19. Cingulum Bundle ROI 4

The color coding of the resulting ROIs is as follows:

ROI 1: Left(7) - Right(8)
ROI 2: Left(9) - Right(16)
ROI 3: Left(11) - Right(12)
ROI 4: Left(13) - Right(14)



Return to Contrasting Tractography Project page