# 📐 L2 Spec — Positron Emission Tomography (PET) Mismatch-Only Spec
**ID:** `L2-033-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-033`](/artifact/l1/L1-033)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41552309
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 |
| W | px | 128 |
| Z | — | 16 – 512 |
| N lors | — | 1000000 – 10000000000 |
| Snr db | dB | 0.0 – 35.0 |
| Scatter | — | 0.0 – 0.5 |
| Counts per lor | — | 0.1 – 1000 |
| Patient motion | — | 0.0 – 0.3 |
| Tof timing jitter | — | 0.0 – 0.5 |
| Random coincidences | — | 0.0 – 0.5 |
| Attenuation correction error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
17.0 + 0.3 * SNR_dB - 8.0 * random_coincidences - 5.0 * scatter - 6.0 * patient_motion
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`344b3c4d1b919e991f37c3e3a8e040d37593f8321ae27a837d7efd7744163e2e`
## 5. On-chain Registration
- **Chain hash:** `0x25fbf1accbc1a8369ca858e164521939331c81a140ec25b32fdee2fa7ea07123`
- **Chain tx hash:** `0x5511f780224eb9704703451a6e674e5b7e22595797ca39f2ad3a1708319a4168`
- **Chain block:** `41552309`
---
## File Mapping
This bundle consists of: `L2-033-001.md`, `L2-033-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-033-001.md` | Source of truth — edit this | Human or LLM |
| `L2-033-001.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 `L2-033-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._