# 📐  L2 Spec — Pharmacokinetic Dynamic PET (PK-PET) — Spec Skeleton

**ID:** `L2-505-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-505`](/artifact/l1/L1-505)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553390

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 512 |
| W | px | 128 – 512 |
| Z | — | 32 – 256 |
| N frames | — | 12 – 60 |
| Tracer class | — | [NEEDS_HAND_AUTHORING: bounds] |
| Voxel size mm | mm | 1.0 – 4.0 |
| Compartment count | — | 1 – 4 |
| Scan duration min | — | 20 – 180 |
| Motion during scan | — | 0.0 – 0.3 |
| Partial volume effect | — | 0.0 – 0.4 |
| Count statistics dropoff | — | 0.0 – 0.5 |
| Scatter correction error | — | 0.0 – 0.2 |
| Input function uncertainty | — | 0.0 – 0.3 |
| Noise equivalent count rate | — | 10000 – 1000000 |
| Attenuation correction error | — | 0.0 – 0.2 |

## 2. Tolerance (ε)

**Type:** `fn`

```
24.0
```

## 3. Difficulty

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

## 4. Fingerprint

`e00b34759816b6d44143a8521222b3cd1f68036d36c464096d15d95e3dca4093`

## 5. On-chain Registration

- **Chain hash:** `0x9c7010680d1eaf0f28586d53a5f676dcc9e977a854d29bc71c75f83a2dca92dc`
- **Chain tx hash:** `0xa5fcdc38494185396f29014a8f0e26b37cd9f6431eac84fd4ddc6afef4400682`
- **Chain block:** `41553390`

---

## File Mapping

This bundle consists of: `L2-505-001.md`, `L2-505-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-505-001.md` | Source of truth — edit this | Human or LLM |
| `L2-505-001.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 `L2-505-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._