```{index} single: Filters; Read North Star Imaging CT (.nsihdr/.nsidat)
```
# Read North Star Imaging CT (.nsihdr/.nsidat)

## Group (Subgroup)

IOFilters (Input)

## Description

This **Filter** will import a NorthStar Imaging data set consisting of a single .nsihdr and one or more .nsidat files. The data is read into an Image Geometry. The user can import a subvolume instead of reading the entire data set into memory.

The user should note that when using the subvolume feature that the ending voxels are **inclusive**.

The .nsihdr file will be read during preflight and the .nsidat file(s) will be extracted from there. The expectation is that the .nsidat files are in the same directory as the .nsihdr files.


### Input Parameter(s)

| Parameter Name | Parameter Type | Parameter Notes | Description |
|----------------|----------------|-----------------|-------------|
| Input Header File | FileSystemPath |  | The path to the .nsihdr file |
| Import Subvolume | Bool |  | Import a subvolume instead of the entire volume |
| Starting XYZ Voxel for Subvolume | Vector of Int32 Values | Order=,, | The starting subvolume voxel |
| Ending XYZ Voxel for Subvolume | Vector of Int32 Values | Order=,, | The ending subvolume voxel (inclusive) |
| Length Unit | Choices |  | The length unit that will be set into the created image geometry |

### Output Data Object(s)

| Parameter Name | Parameter Type | Parameter Notes | Description |
|----------------|----------------|-----------------|-------------|
| Image Geometry Path | DataGroupCreation |  | The path that will be used to create the Image Geometry. |
| Cell Attribute Matrix Name | DataObjectName |  | The name used to create the Cell Attribute Matrix. |
| Density Array | DataObjectName |  | The name used to create the Density data array. |

## License & Copyright

Please see the description file distributed with this plugin.

## DREAM3D-NX Help

If you need help, need to file a bug report or want to request a new feature, please head over to the [DREAM3DNX-Issues](https://github.com/BlueQuartzSoftware/DREAM3DNX-Issues/discussions) GitHub site where the community of DREAM3D-NX users can help answer your questions.
