# 📐  L2 Spec — Single-Photon Emission Computed Tomography (SPECT) Mismatch-Only Spec

**ID:** `L2-034-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-034`](/artifact/l1/L1-034)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553360

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 |
| W | px | 64 |
| Z | — | 16 – 512 |
| Snr db | dB | 0.0 – 35.0 |
| Scatter | — | 0.0 – 0.5 |
| N angles | — | 8 – 256 |
| Patient motion | — | 0.0 – 0.3 |
| Collimator blur | — | 0.0 – 0.3 |
| Counts per pixel | — | 1 – 10000 |
| Attenuation correction error | — | 0.0 – 0.3 |

## 2. Tolerance (ε)

**Type:** `fn`

```
14.0 + 2.0 * log10(counts_per_pixel / 1) - 8.0 * collimator_blur - 6.0 * scatter
```

## 3. Difficulty

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

## 4. Fingerprint

`c704df4b07d1726ce39d5c5af9d4dd0fba338356644f217ea2302d6adc3fc995`

## 5. On-chain Registration

- **Chain hash:** `0x987cb707e9b34b71283a328d812f544e4081144b0ef7955d52899404204aad14`
- **Chain tx hash:** `0x16505511ca35d24cad1fdb1fc3d72b500f31f431bfaafe552b023f30ca0747c6`
- **Chain block:** `41553360`

---

## File Mapping

This bundle consists of: `L2-034-001.md`, `L2-034-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-034-001.md` | Source of truth — edit this | Human or LLM |
| `L2-034-001.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 `L2-034-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._