dcm2nii

dcm2nii is a skill for Claude Code, Codex from CUHK-AIM-Group/NeuroClaw. It costs 181 tokens per session (1,986 once invoked), scanned A, original, MIT.

A tool workflow for converting DICOM medical-imaging files into NIfTI files used by research software. DICOM is the clinical format commonly produced by scanners, while NIfTI is a compact format supported by neuroimaging tools.

In plain words
What is it for?
Use it to convert one or many DICOM series, optionally anonymize them, and prepare data for neuroimaging workflows. The standard output is paired .nii.gz and .json files, including BIDS-compatible metadata when requested.
Why use it?
It prepares MRI, CT, PET, and similar scan data for research pipelines while retaining useful acquisition metadata in JSON sidecar files.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is dcm2niix -z y -o ./nifti/ ./dicom/T1_MPRAGE/.

Good fit Use it to convert one or many DICOM series, optionally anonymize them, and prepare data for neuroimaging workflows. The standard output is paired .nii.gz and .json files, including BIDS-compatible metadata when requested.

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Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/CUHK-AIM-Group/NeuroClaw
agentmods
npx agentmods add skills/cuhk-aim-group/neuroclaw/dcm2nii

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for dcm2nii

README.md
[![agentmods](https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/dcm2nii/github.svg)](https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/dcm2nii)
Your own site
<a href="https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/dcm2nii"><img src="https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/dcm2nii/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for dcm2nii

Your own site · 80×15
<a href="https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/dcm2nii"><img src="https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/dcm2nii.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 181 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,986 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 3 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 80
    Docker image references without a specific tag (:latest is implicit) or digest (@sha256:...) can be silently replaced by a malicious image.
    Fix: Pin the image: image:tag or image@sha256:abc123
  • medium MCP Rug Pull · line 81
    Docker image references without a specific tag (:latest is implicit) or digest (@sha256:...) can be silently replaced by a malicious image.
    Fix: Pin the image: image:tag or image@sha256:abc123
  • low Tool Misuse · line 81
    Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
    Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00181 $0.01986
Opus 5 $0.00090 $0.00993
Sonnet 5 $0.00036 $0.00397
Haiku 4.5 $0.00018 $0.00199

Measured 11d ago against content hash 69bd02278312, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

dcm2nii scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

wget https://github.com/rordenlab/dcm2niix/releases/latest/download/dcm2niix_lnx.zip

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

# then call subprocess.run(["dcm2niix", ...])
skills/dcm2nii/SKILL.md · 189 lines

How it starts

The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DICOM to NIfTI conversion

Overview

DICOM is the universal clinical imaging format containing rich metadata, patient information, acquisition parameters, and often multi-slice series.
NIfTI (.nii/.nii.gz) is the de-facto standard in neuroimaging research — compact, orientation-aware, and directly supported by FSL, FreeSurfer, SPM, AFNI, ANTs, etc.

This skill wraps dcm2niix (latest stable release as of 2026), the most widely used and actively maintained DICOM→NIfTI converter in neuroimaging.
It produces high-fidelity 3D/4D NIfTI volumes + comprehensive JSON sidecar files containing DICOM tags (BIDS-compatible when using -b y).

Benchmark-Facing Default Mainline

For benchmark-style DICOM conversion tasks, default to the narrow canonical answer instead of a broad converter survey:

  • Preferred default command shape: dcm2niix -z y -b y -o <output_dir> <dicom_dir>
  • For batch conversion, the default answer should be a simple loop over subject/session or series directories.
  • Metadata preservation means emitting paired .nii.gz and .json outputs; present this as the primary validation target.
  • Prefer dcm2niix over legacy dcm2nii unless the user explicitly asks for the legacy converter.
  • Do not lead with installation, Docker, anonymization, or wrapper-script material unless the prompt asks for those concerns or the task is blocked by a missing binary.

If the prompt is specifically about structural MRI DICOM conversion, keep the answer focused on batch conversion plus sidecar validation. Do not expand into downstream BIDS curation or anatomical processing unless requested.

Research use only — not certified for clinical diagnostic workflows.

Quick Reference

Task Recommended Flags / Approach
Basic single-series conversion dcm2niix -z y -o output/ dicom_folder/
4D fMRI/DWI/perfusion dcm2niix -z y -f "%s_%t" -b y dicom_folder/
BIDS-like naming + JSON sidecar -o out/ -f sub-%s_ses-%t -z y -b y
Lossless compression -z y (pigz) or -z i (internal)
Anonymize (remove most PHI) -x y (cautious) or -x n (aggressive)
Merge 2D slices into 3D volume default behavior (auto-detected)
Keep slice timing / Philips diff -t y (important for fMRI)
Custom output filename -f "%p_%s_%t_%d" (patient_study_time_desc)
Only convert specific series Use -m y + manual selection or post-filter

Read the full file on GitHub · 189 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 189 lines · 181 tokens per session scan A 69bd02278312

Subscribe to this mod's changes

dcm2nii is a skill published in the GitHub repository CUHK-AIM-Group/NeuroClaw (84 stars, last pushed 4d ago), licensed MIT. It adds 181 tokens to every session and 1,986 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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