Hello,

There was a bug in the sbtiv utility that was causing that “Namespace” error you were seeing. Patched versions of the files are available here: https://ftp.nmr.mgh.harvard.edu/pub/dist/lcnpublic/dist/sbtiv_patch/ To apply the patch, download the tarball, unpack it, and then copy the sbtiv.py script to /Applications/freesurfer/8.1.0/python/packages/samseg/cli/sbtiv.py, to replace the buggy file.

You are correct that the value in sbtiv.stats is the same as the intracranial volume reported in samseg.stats, and that it is the sbTIV value. I believe that sbtiv.stats should be automatically generated when running the samseg pipeline, so you probably don’t need to run this util.

You can use the sbtiv util, along with a specified list of measurements that appear in samseg.stats to specify which measures it sums to give the total intracranial volume reported in the output file.

Best, Jackson

From: Chelsea Hennessy chelseahennessy@outlook.com Date: Wednesday, November 12, 2025 at 11:39 PM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] sbTIV SAMSEG error

External Email - Use Caution Hello,

I am trying to run sbTIV following on my SAMSEG output through Freesurfer, but am running into issues.

My SAMSEG code: #!/bin/bash # script to run SAMSEG on all participants

# define directories DATA_DIR=“XYZ" OUTPUT_BASE_DIR=“XYZ" LOG_DIR=“XYZ"

# create directories if they don't exist mkdir -p "${OUTPUT_BASE_DIR}" mkdir -p "${LOG_DIR}"

# log file LOG_FILE="${OUTPUT_BASE_DIR}/samseg_log.txt" echo "SAMSEG processing started: $(date)" > "${LOG_FILE}"

# loop through all participant directories for SUB_DIR in "${DATA_DIR}"/sub-*/; do # extract participant ID from directory name SUB_ID=$(basename "${SUB_DIR}") # define directory paths T1_FILE="${SUB_DIR}ses-01/anat/${SUB_ID}_ses-01_T1w.nii.gz" OUTPUT_DIR="${OUTPUT_BASE_DIR}/${SUB_ID}" INDIVIDUAL_LOG="${LOG_DIR}/${SUB_ID}_samseg_log.txt" # check if T1w image file exists if [ -f "${T1_FILE}" ]; then echo "Processing ${SUB_ID}..." | tee -a "${LOG_FILE}" echo "Input: ${T1_FILE}" | tee -a "${LOG_FILE}" echo "Output: ${OUTPUT_DIR}" | tee -a "${LOG_FILE}" # run SAMSEG run_samseg --input "${T1_FILE}" --output "${OUTPUT_DIR}" --threads 8 2>&1 | tee "${INDIVIDUAL_LOG}" # check if analysis completed successfully if [ $? -eq 0 ]; then echo "SUCCESS: ${SUB_ID} completed at $(date)" | tee -a "${LOG_FILE}" else echo "ERROR: ${SUB_ID} failed at $(date)" | tee -a "${LOG_FILE}" fi echo "-----------------------------------" | tee -a "${LOG_FILE}" else echo "WARNING: T1 file not found for ${SUB_ID}" | tee -a "${LOG_FILE}" echo "Expected: ${T1_FILE}" | tee -a "${LOG_FILE}" echo "-----------------------------------" | tee -a "${LOG_FILE}" fi done

echo "SAMSEG analysis completed: $(date)" | tee -a "${LOG_FILE}" echo "Log file saved to: ${LOG_FILE}"

When trying to run sbTIV for one participant as an example:

sbtiv <path>/samseg.stats -o <path>/sbtiv.stats

Error:

Traceback (most recent call last):

File "/Applications/freesurfer/8.1.0/python/scripts/sbtiv", line 8, in <module>

sys.exit(main())

File "/Applications/freesurfer/8.1.0/python/packages/samseg/cli/sbtiv.py", line 23, in main

with open(args.input) as fid:

AttributeError: 'Namespace' object has no attribute 'input'

Am I correct in understanding that the value provided in the sbtiv.stats is the sbTIV value? Even when it is the same as the intra-cranial measure from the samseg.stats file?

I have very limited coding/neuroimaging analysis knowledge, so any help you can provide here is greatly appreciated!

Cheers, Chelsea