Thank you, Daniel！
I am interested in the activities of different insular subregions recently. I find the available atlases of insular subregions on the Internet are all in MNI space. For example, The atlases which include 5 subregions provided in this site ([size=x-small]Faillenot, I., Heckemann, R. A., Frot, M., & Hammers, A. (2017). Macroanatomy and 3D probabilistic atlas of the human insula. NeuroImage, 150, 88-98.[/size]) are produced in MNI152 space. But all my previous processings were done in Talairach space and TT_N27 was used as the template in AFNI. So I need to transform these atlases to Talairach space firstly if necessary.
But I have some questions before that:
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I know it is not accurate at all no matter what kind of transformation between MNI and Talairach is performed. So do you know any atlas in TT_N27 space which includes several subregions of insular?
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If the insular atlas in Talairach space does not exist, the transformation is ineluctability.
And I have tried to do this:
One subregion in the atlases mentioned above was transformed into Talairach space:
3dWarp -mni2tta -NN -prefix Transformed_dset probmap-gm-r20-insula_posterior_long_gyrus_L.nii
[size=small]++ 3dWarp: AFNI version=AFNI_17.0.09 (Aug 7 2009) [64-bit]
++ Authored by: RW Cox[/size]
And a dateset was generated:
ls Transformed_dset*
[size=small]Transformed_dset+orig.BRIK Transformed_dset+orig.HEAD[/size]
But the generated daset is still with the suffix of ‘+orig’. And it is in the space of TLRC:
3dinfo Transformed_dset*
[size=small]++ 3dinfo: AFNI version=AFNI_17.0.09 (Aug 7 2009) [64-bit]
Dataset File: Transformed_dset+orig
Identifier Code: XYZ_YmftSLU67NPk50y5huwi5w Creation Date: Fri Mar 2 04:07:20 2018
Template Space: TLRC
Dataset Type: Anat Bucket (-abuc)
Byte Order: LSB_FIRST [this CPU native = LSB_FIRST]
Storage Mode: BRIK
Storage Space: 18,515,952 (19 million [mega]) bytes
Geometry String: "MATRIX(1,0,0,-78,0,-1,0,112,0,0,1,-70):157,189,156"
Data Axes Tilt: Plumb
Data Axes Orientation:
first (x) = Right-to-Left
second (y) = Posterior-to-Anterior
third (z) = Inferior-to-Superior [-orient RPI]
R-to-L extent: -78.000 [R] -to- 78.000 [L] -step- 1.000 mm [157 voxels]
A-to-P extent: -76.000 [A] -to- 112.000 [P] -step- 1.000 mm [189 voxels]
I-to-S extent: -70.000 [I] -to- 85.000 [S] -step- 1.000 mm [156 voxels]
Number of values stored at each pixel = 1
-- At sub-brick #0 '#0' datum type is float: 0 to 30
----- HISTORY -----
[emily@zhangxue-Precision-T7610: Fri Mar 2 04:07:20 2018] 3dWarp -mni2tta -NN -prefix Transformed_dset probmap-gm-r20-insula_posterior_long_gyrus_L.nii[/size]
It can’t match the TT_N27 dateset:
3dinfo TT_N27
[size=small]++ 3dinfo: AFNI version=AFNI_17.0.09 (Aug 7 2009) [64-bit]
Dataset File: TT_N27+tlrc
Identifier Code: XYZ_8RjUZA_-GBen3pQPl0DbbA Creation Date: Wed Aug 1 13:46:03 2007
Template Space: TT_N27
Dataset Type: MRI Anatomy (-anat)
Byte Order: MSB_FIRST [this CPU native = LSB_FIRST]
Storage Mode: BRIK
Storage Space: 4,643,401 (4.6 million [mega]) bytes
Geometry String: "MATRIX(1,0,0,-80,0,1,0,-80,0,0,1,-65):161,191,151"
Data Axes Tilt: Plumb
Data Axes Orientation:
first (x) = Right-to-Left
second (y) = Anterior-to-Posterior
third (z) = Inferior-to-Superior [-orient RAI]
R-to-L extent: -80.000 [R] -to- 80.000 [L] -step- 1.000 mm [161 voxels]
A-to-P extent: -80.000 [A] -to- 110.000 [P] -step- 1.000 mm [191 voxels]
I-to-S extent: -65.000 [I] -to- 85.000 [S] -step- 1.000 mm [151 voxels]
Number of values stored at each pixel = 1
-- At sub-brick #0 'colin27T1_seg' datum type is byte: 0 to 222[/size]
And it can’t be used as the mask directly to 3dmaskave. What should I do next?
Yu
