# Segmentations `dcmqi` provides command line tools to convert rasterized segmentations stored in commonly used research formats, such as NRRD or NIfTI, into DICOM Segmentation image storage (DICOM Segmentation) object. DICOM Segmentations are organized as a lists of *segments*, where each segment corresponds to a separate object/label being segmented. Segments can overlap (i.e., a single voxel of the source image can have multiple labels). Each segment contains information about what it describes, and what method was used to generate it. To perform the conversion to DICOM, the segmentation (image volume representing the labeling of the individual image voxels) needs to be accompanied by a JSON file that describes segmentation metadata (such as the one in [this example](https://github.com/QIICR/dcmqi/blob/master/doc/examples/seg-example.json)), and by the DICOM dataset corresponding to the source image data being segmented. The source DICOM dataset is used to populate metadata attributes that are inherited by the segmentation (i.e., *composite context*), such as information about patient and imaging study. Conversion from DICOM Segmentation to research formats produces one file per segment saving the labeled image raster in the research format, such as NRRD or NIfTI, and a metadata JSON file. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://qiicr.gitbook.io/dcmqi-guide/opening/cmd_tools/seg.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.