# 📐 L2 Spec — Pulmonary Embolism Detection from CT Pulmonary Angiography (PWDR) — Spec Skeleton
**ID:** `L2-525-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-525`](/artifact/l1/L1-525)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553376
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 1024 |
| W | px | 256 – 1024 |
| Z | — | 100 – 800 |
| Kvp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Mas | — | [NEEDS_HAND_AUTHORING: bounds] |
| Voxel size mm | mm | [NEEDS_HAND_AUTHORING: bounds] |
| Slice thickness mm | mm | 0.5 – 3.0 |
| Contrast bolus timing | — | [NEEDS_HAND_AUTHORING: bounds] |
| Rv lv measurement axis | — | [NEEDS_HAND_AUTHORING: bounds] |
| Beam hardening artifact | — | [NEEDS_HAND_AUTHORING: bounds] |
| Ai threshold calibration | — | [NEEDS_HAND_AUTHORING: bounds] |
| Motion during breath hold | — | [NEEDS_HAND_AUTHORING: bounds] |
| Partial volume at subsegmental | — | [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
`d72886bd039295edd397b20370118a5381bc4bd2ee26b2bac0d82a9a8a09efe9`
## 5. On-chain Registration
- **Chain hash:** `0xe56ca3a5550ba6b48037722702f7e06d8d222b735fde86070b315519533b09c8`
- **Chain tx hash:** `0x6e067820243570df17f0479d2c800240626e32a65984865764ffb33aad2c6b1a`
- **Chain block:** `41553376`
---
## File Mapping
This bundle consists of: `L2-525-001.md`, `L2-525-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-525-001.md` | Source of truth — edit this | Human or LLM |
| `L2-525-001.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 `L2-525-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._