# Data formats

Note that all binary formats encode numerical values in little endian.

## Scanner (`Scanner`)

Scanners are defined in two parts:
- A scanner parameters file in JSON format
- A Look-Up-Table (LUT) file in binary format.

See [Documentation on the scanner definition](scanner) for more details

## Image format (`Image`)

Images are read and stored in NIfTI format.
YRT-PET also uses a JSON file to define the Image parameters
(size, voxel size, offset, time dimension).
See [Documentation on the Image parameters format](image).

## YRT-PET raw data format (`Array`)

YRT-PET stores its array structures in the RAWD format.
See [Documentation on the RAWD file structure](rawd_file)

## Listmode (``ListmodeLUT``)

YRT-PET defines a generic default List-Mode format.
When used as input, the format name is `LM`.
See [Documentation on the List-Mode file](list-mode_file)

## Sparse histogram (``SparseHistogram``)

YRT-PET defines a generic default sparse histogram format.
When used as input, the format name is `SH`.
See [Documentation on the sparse histogram file](sparse-histogram)

## Motion information (`LORMotion`)

Motion information is encoded in a binary file describing the transformation
of each frame.
See [Documentation on the Motion information file](motion_file)

## Histogram (`Histogram3D`)

Fully 3D Histograms are stored in YRT-PET's RAWD format
[described earlier](rawd_file). Values are encoded in `float32`.
The histogram's dimensions are defined by the scanner properties, which are
defined in the `json` file [described earlier](scanner).

See [Documentation on the histogram format](histogram3d_format)
for more information.
When used as input, the format name is `H`.