# Pulseq basics

The first lessons of the course: events, blocks and timing, from the
two-event experiment that every later lesson extends to a slice-selective
gradient echo.

| Page | What it establishes |
| --- | --- |
| {doc}`/generated/gallery/01-pulseq-basics/01_fid` | A pulse and an acquisition window, the limits and rasters they are built against, and the file that is written. |
| {doc}`/generated/gallery/01-pulseq-basics/02_spin_echo` | A refocusing pulse and the crusher pair around it, and the shortest echo time the pair admits. |
| {doc}`/generated/gallery/01-pulseq-basics/03_gradient_echo` | Slice selection, phase encoding and an echo formed by the readout gradient, and where the echo lands when the prewinder is shortened. |

```{toctree}
:hidden:

/generated/gallery/01-pulseq-basics/01_fid
/generated/gallery/01-pulseq-basics/02_spin_echo
/generated/gallery/01-pulseq-basics/03_gradient_echo
```