ILI

Trevor Day // day00096@umn.edu

Code to create the Singularity container for ILI ROI creation and processing.

The steps are to:

1. roi: Create the mixed ROIs for a given source ROI.
2. analysis: For each of those mixed ROIs, create a seedmap and calculate its laterality.
3. ili: From the results of analysis, calculate the ILI for all available results.

Setup

This repository relies on a second repository as a submodule. When cloning for the first time, run the following code (see this StackOverflow answer).

git submodule update --recursive --remote

The container itself requires Git Large File Storage. To get the .sif file:

git lfs fetch
git lfs checkout

Running ROI creation

The container requires two bind points: the input ROI and the location to save the created crossotopes to.

The directory containing the ROI gets bound to /roi and the outputs to /roi_outputs. The name of the file must still be passed to the container with --input_roi. The output directory does not.

roi_name=example.dscalar.nii
roi_outputs=container_rois

# This is done to make sure too many ROIs aren't created
rm -rf ${roi_outputs}
mkdir -p ${roi_outputs}

singularity run                         \
    -B data/example_roi/:/roi           \
    -B ${roi_outputs}:/roi_outputs      \
    my_img.sif roi                      \
        --input_roi /roi/${roi_name}    \
        -n 10

The ROI creation:

1. Creates a mirror of your input on the right hemisphere. (Needs update to start in the right hemisphere.)
2. Generates n different dscalars for each value of nrh between 1 and the total size of your ROI. So if you ask for -n 10 repeats of a 100-greyordinate ROI, you will create 100 ROIs.
3. The dscalars are mapped onto dlabel files (in fsLR32k space: needs update to add 164k space).
4. The dlabels are split into left/right label.gii files. Only the GIFTIs are saved from all this processing: You don't need any of the other files.

ROI tree

ili_manager.py
    |- rois_create_mirror.sh
    |- rois_permute_ROI.R
    |- rois_dscalar_to_surface.sh

Running analysis

The analysis works best using derivatives from the DCAN Labs ABCD pipelines.

The analysis flow requires a lot more bind points. From top to bottom:

1. The session-level directory containing the dtseries, and motion .mat file.
2. The ROIs created using the ROI flow above.
3. The Matlab runtime. R2023b is known to work with this code.
4. The JSON configuration file for the analysis parameters (see below).
5. The directory to save the output CSV to. One CSV per session.

Additionally, the midthickness files must be including if smoothing is enabled.

The options to the container itself are more self-explanatory. If you bind the directory to its default value (i.e. binding the Matlab as such ${MRE}:/matlab or example_config.json:/config.json), you do not need to set the associated parameter.

• The positional arguments are the input dtseries file and its associated motion .mat file.
  • If you do not wish to perform censoring, pass the string "NONE." As of Dec. 12, 2024, passing NONE doesn't seem to be working.
• --roi_dir takes the path to the ROIs and figures out how many there are.
  • Default: /input_rois/
• --n_samples is how many ROIs to use (e.g. if the ROI is 500 greyordinates, you don't have to use them all).
  • Default: 100.
• The path to the Matlab binary (--matlab), since I can't package it in the container.
• The path to the Matlab runtime (--MRE).
  • Default: /matlab/
• The path to the JSON config file, which should be bound to the container (--json_config).
  • Default: /config.json
• Finally, the --label is prepended to the results, e.g. label_results.csv.
  • Default: "crossotope"

Example code:

MRE=/common/software/install/manual/matlab/R2023b/

singularity run \
    -B ${ex_sub}/:/session/            \
    -B container_rois/:/input_rois/    \
    -B ${MRE}:/matlab/                 \
    -B config.json:/config.json        \
    -B container_output:/output/       \
    my_img.sif analysis                \
        --n_samples     100                 \
        --matlab        "$(which matlab)"   \
        --label         foobar              \
        /session/${dtseries}                \
        /session/${motion}

Config file

All options regarding the processing itself (e.g. motion limits, minute limits) are included in a configuration JSON file, see below. This also makes the CLI options less overwhelming to navigate.

{
    # Values for seedmap wrapper

    "fd_threshold":         0.2,    # Threshold in mm

    "smoothing_kernel":     0,      # Smoothing kernel in mm
                                    #   0 = none

    "max_minutes":          10,     # Minutes to sample from dtseries
                                    #   0 = no limit

    "remove_outliers_yn":   1,      # Whether to remove outliers (0/1)

    "z_transform_yn":       1       # Whether to Z-transform results (0/1)

    # Thresholds for determining laterality

    "cluster_value_min":        0.4     # Value to threshold map at

    "cluster_surf_area_min":    10,     # Minimum cluster size to keep
                                        #   (mm^2)
}

Default values are those listed in example above. NB: You can't include comments in actual JSON files.

Minutes

dtseries files with less than 10 minutes of good data will be run; the output files have a different name than those that met the criterion.

Files with less than 30 s of good data will not be run at all.

Z-threshold

Currently, the no-transformation option isn't complete. Keep it set to 1.

Analysis tree

ili_manager.py
    |- analysis-run_seedmap.sh
        |- seedmap_wrapper.py
            |- Cifti_conn_matrix_to_corr_dt_pt
            |- MATLAB
    |- analysis-cluster.sh

Benchmarks

On MSI

• ROI creation: With 16 GB RAM: 7-8 minutes for 490 total ROIs (1 s/ROI, or 61 ROIs/minute).
• Analysis: With 56 GB RAM: 20 minutes for 100 samples (12 s/ROI or 5 samples per minute).

ILI Calculation

The analysis step above creates one CSV per session with the actual L/R values for possible futher computation. The subcommand ili takes a single-level directory of n CSVs and returns a single CSV with n non-header rows with the name of the file and the computed ILI value.

singularity run crossotope.sif ili input_dir output.csv

The maximum size of each ROI will be estimated by the largest value in the results. Technically, n values are sampled between {1..size}, which means this doesn't affect the values materially, especially for n in the hundreds.

You can suppy a JSON file with the max size of each ROI, that takes the simple format:

{
    "roi1": 100,
    "roi2": 150
}

Extracting FD

The motion exclusion results for every framewise displacement (FD) threshold between 0.0 and 0.5 mm (in steps of 0.01 mm) are provided in the ABCD HCP pipeline .mat files. This makes it easy to extract the amount of data that were used in each analysis post hoc.

The command below extracts from a single .mat file and FD threshold the following values: TR (in seconds), frames remaining, seconds remaining (i.e. TR times frames remaining), and the mean FD of the remaining frames.

singularity run crossotope.sif fd [mat file] [fd]

This code should be run on a list of .mat files. Future versions will incorporate output of FD statistics as part of analysis, but hasn't been integrated yet.

Acknowledgements

• Seed map wrapper development: Robert Hermosillo, PhD; Greg Conan
• Testing and development: Eric Feczko, PhD; Maryam Mahmoudi, PhD

Change log

• Dec. 12, 2024: ver. 0.7.2

  • Fixed issue with opening temporary directories.
  • Added information to print statements to help locate issues (not complete).

• Dec. 2, 2024: ver. 0.7.0

  • Many fixes in order to get around MATLAB problems caused by MSI updated to Rocky 8.
  • As a consequence, the seed map wrapper was writing out one-frame dtseries files, which are now being averaged to create a dscalar, resulting in a new warning, which can be safely ignored.
  • Currently tested to be working with MATLAB R2023b.