# 📐 L2 Spec — Cardiac 4D-flow MRI with Hemodynamic Biomechanics — Spec Skeleton
**ID:** `L2-510-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-510`](/artifact/l1/L1-510)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41552981
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 512 |
| W | px | 128 – 512 |
| Z | — | 32 – 256 |
| Te ms | ms | 1.5 – 5.0 |
| Tr ms | ms | 3.0 – 10.0 |
| Snr db | dB | 5.0 – 38.0 |
| Venc mps | — | 0.5 – 6.0 |
| B0 field t | — | 1.5 – 7.0 |
| Venc aliasing | — | 0.0 – 0.3 |
| Voxel size mm | mm | 1.0 – 4.0 |
| N cardiac phases | — | 10 – 50 |
| Breath hold motion | — | 0.0 – 0.3 |
| Eddy current offset | — | 0.0 – 0.2 |
| Viscosity uncertainty | — | 0.0 – 0.3 |
| Partial volume at walls | — | 0.0 – 0.4 |
| Segmentation error at chambers | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
26.0
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`287b7a0f0741a63f7295979d7aeb936435f341074a92b5aa4b6d728d3cffb153`
## 5. On-chain Registration
- **Chain hash:** `0xdcb72e47de3764722f20e2ef0790e05504f9a3b05f217a540d7b7f744826f13d`
- **Chain tx hash:** `0x48b2c59a2d87196aeeaea1495b10c8c0c3c92e5a174f71b2074a5a9b51458cf3`
- **Chain block:** `41552981`
---
## File Mapping
This bundle consists of: `L2-510-001.md`, `L2-510-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-510-001.md` | Source of truth — edit this | Human or LLM |
| `L2-510-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-510-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._