# 📐  L2 Spec — Stroke Ischemic Core / Penumbra Classification from CT-Perfusion (PWDR) — Spec Skeleton

**ID:** `L2-524-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-524`](/artifact/l1/L1-524)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553363

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 1024 |
| W | px | 256 – 1024 |
| Z | — | 8 – 80 |
| Kvp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Mas | — | [NEEDS_HAND_AUTHORING: bounds] |
| N time frames | — | 20 – 120 |
| Voxel size mm | mm | [NEEDS_HAND_AUTHORING: bounds] |
| Frame period s | s | 1.0 – 3.0 |
| Contrast dose ml | — | [NEEDS_HAND_AUTHORING: bounds] |
| Contrast bolus timing | — | [NEEDS_HAND_AUTHORING: bounds] |
| Aif selection uncertainty | — | [NEEDS_HAND_AUTHORING: bounds] |
| Motion during acquisition | — | [NEEDS_HAND_AUTHORING: bounds] |
| Partial volume at arteries | — | [NEEDS_HAND_AUTHORING: bounds] |
| Deconvolution regularization | — | [NEEDS_HAND_AUTHORING: bounds] |
| Threshold calibration vendor difference | — | [NEEDS_HAND_AUTHORING: bounds] |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.85_accuracy
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`fc64773a66498b54e6b9e04af409e6544bc381cc3bba8e89f32e9bdeb37122b3`

## 5. On-chain Registration

- **Chain hash:** `0xb54381e8e14b6af80ecb17a170fe99ba90f9560fa3c7cc945dac2aa2d8d127c6`
- **Chain tx hash:** `0x934e2744c9b8f827dad85f6ac8b73b8a14db41ee07e7a1a6ad2f07a28e18577f`
- **Chain block:** `41553363`

---

## File Mapping

This bundle consists of: `L2-524-001.md`, `L2-524-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-524-001.md` | Source of truth — edit this | Human or LLM |
| `L2-524-001.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 `L2-524-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._