What is the meaning of I-S in the csa document

SCT
1

dear jcohenadad . I have a problem , when I run the outcome of the same dti . different I-S value shows the different outcome , even they are the same verlevel. what is the meaning of I-S in the csa document ? why it will come out?

Snip20200211_31
Snip20200211_31968×1992 261 KB

at the same time , I am afraid I have problem in label c2,c2-c3 , c3 ,c3-c4. this is my script. could you have a look ?

 !/usr/bin/env bash

file_dwi="TANG_WING_KUN_WIP_DTI_thk7_breath_1_5_2"

file_bvec=${file_dwi}.bvec

file_bval=${file_dwi}.bval

Separate b=0 and DW images

sct_dmri_separate_b0_and_dwi -i ${file_dwi}.nii.gz -bvec ${file_bvec}

sct_propseg -i ${file_dwi}_dwi_mean.nii.gz -c dwi

sct_create_mask -i ${file_dwi}_dwi_mean.nii.gz -p centerline,${file_dwi}_dwi_mean_seg.nii.gz -size 30mm

sct_crop_image -i ${file_dwi}.nii.gz -m mask_${file_dwi}_dwi_mean.nii.gz -o ${file_dwi}_crop.nii.gz

sct_dmri_moco -i ${file_dwi}_crop.nii.gz -bvec ${file_dwi}.bvec -x spline

file_dwi=${file_dwi}_crop_moco

file_dwi_mean=${file_dwi}_dwi_mean

# # Segment spinal cord (only if it does not exist)

sct_deepseg_sc -i ${file_dwi_mean}.nii.gz -c dwi -qc qc

file_dwi_seg=${file_dwi_mean}_seg

# # # Create labels, assuming that the mid-FOV is centered at C2 vertebral level

# sct_label_utils -i ${file_dwi_seg}.nii.gz -create-seg 2,3 -o label_C2.nii.gz

sct_label_utils -i ${file_dwi_seg}.nii.gz -create-seg -2,3 -o label_C2.nii.gz

sct_register_to_template -i ${file_dwi_mean}.nii.gz -s ${file_dwi_seg}.nii.gz -l label_C3.nii.gz -ref subject -c t1 -param step=1,type=seg,algo=centermassrot:step=2,type=im,algo=syn,metric=CC,slicewise=0,smooth=0,iter=3 -qc qc

mv warp_template2anat.nii.gz warp_template2dwi.nii.gz

mv warp_anat2template.nii.gz warp_dwi2template.nii.gz

sct_warp_template -d ${file_dwi_mean}.nii.gz -w warp_template2dwi.nii.gz -qc qc

sct_dmri_compute_dti -i ${file_dwi}.nii.gz -bvec ${file_bvec} -bval ${file_bval} -method standard

# sct_maths -i label/atlas/PAM50_atlas_00.nii.gz -add $(for i in `seq -w 2 2 36`; do echo "label/atlas/PAM50_atlas_${i}.nii.gz"; done) -o label/atlas/PAM50_atlas_left.nii.gz

# sct_maths -i label/atlas/PAM50_atlas_01.nii.gz -add $(for i in `seq -w 3 2 35`; do echo "label/atlas/PAM50_atlas_${i}.nii.gz"; done) -o label/atlas/PAM50_atlas_right.nii.gz

sct_extract_metric -i dti_FA.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -perlevel 1 -o DWI_FA.csv -append 1

sct_extract_metric -i dti_MD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -perlevel 1 -o DWI_MD.csv -append 1

sct_extract_metric -i dti_RD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -perlevel 1 -o DWI_RD.csv -append 1

sct_extract_metric -i dti_FA.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -o DWI_FA.csv -append 1

sct_extract_metric -i dti_FA.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 3:4 -o DWI_FA.csv -append 1

sct_extract_metric -i dti_MD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -o DWI_MD.csv -append 1

sct_extract_metric -i dti_MD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 3:4 -o DWI_MD.csv -append 1

sct_extract_metric -i dti_RD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 2:3 -o DWI_RD.csv -append 1

sct_extract_metric -i dti_RD.nii.gz -f label/atlas -l 30,31,32,33,34,35,58,59 -vert 3:4 -o DWI_RD.csv -append 1
2

Hi,

different I-S value shows the different outcome , even they are the same verlevel.

everything seems fine. E.g., vertLevel 7 always corresponds to slices 2:3.

what is the meaning of I-S in the csa document ?

Inferior-Superior (direction of your slice indexing).

at the same time , I am afraid I have problem in label c2,c2-c3 , c3 ,c3-c4

I don’t understand the question. If you have a problem, please describe it with explicit terms.

3

The problem is
1)I want to get the value of the Fa of left gm ,left gm ,left lateral gm and left meditation gm and right value for c6 .c6-c7 disc.c7.c7- T1disc. I could calculate the related value of c6 and c7 , but I don’t know how to label the c6-c7 ,and c7-T1 disc. how to modify my script?
Do you think the script is ok?
2)what is more , for your script ,
sct_label_utils -i ${file_dwi_seg}.nii.gz -create-seg -1,6 -o label_C6.nii.gz
I don’t know the meaning of the create-seg -1,6 -o label_C6.nii.gz , why you create-seg-1,6 . could you explain for a while ?
and if I want to label the c4( anther file which contains c4,c5, c4-c5,c5-c6). should I change it to create- seg-1,4 ? this is the file .
ZONG,_XIAOLAN_WIP_DTI_thk7_breath-2_5_2.PAR (34.6 KB)

4

Hi,

With all due respect, I have already answered these questions in my previous posts. I feel that we are going in circle, and that you would need a more extensive and personalized help to perform the analysis for your research. I can do the analysis for you if you want, but first we would need to officialize a collaboration. Please feel free to contact me via email if you are interested in such collaboration.

Best,
Julien