# Internals

Rules, derivations, frames and units behind the explanation pages.

| Page | Contents |
| --- | --- |
| {doc}`pulseq-file` | Sections, libraries, deduplication, signatures, revisions, binary form and rasters |
| {doc}`cpp-core` | Native hot paths, snapshot ownership, revision counter and facade contracts |
| {doc}`rf-and-gradient-design` | Pulse designers, pTx layout, Bloch simulation and the gradient solver |
| {doc}`sequence-modules` | Module structure, event publication, protocol parsing, labels and chains |
| {doc}`sampling-and-ordering` | Supports, orderings, EPI offsets, angle increments and RF schedules |
| {doc}`sequence-analysis` | Waveform reconstruction, k-space integrals, repetition and FOV transforms |
| {doc}`safety-checks` | Gradient, PNS, mechanical-resonance, sound-pressure and SAR computations |

```{toctree}
:hidden:

pulseq-file
cpp-core
rf-and-gradient-design
sequence-modules
sampling-and-ordering
sequence-analysis
safety-checks
```