# Importing Multiple Single-Frame DICOM Files as a 3D NRRD Asset

You may group together single-frame 2D DICOM files and upload them to Hub as a single 3D NRRD asset.

Assets uploaded this way are opened in the [Medical Labeling Editor](/labeling/labeling-editor-interface/medical-labeling-editor.md), rather than the DICOM labeling editor.

{% hint style="warning" %}
This functionality is only available for single-frame 2D DICOM files.
{% endhint %}

You may upload such multi-DICOM assets using the *Cloud Import* and the *File Explorer* methods outlined below. During upload, Ango Hub converts the grouped DICOM files into one NRRD file.

## Importing DICOM Files as NRRD Assets using the Cloud Upload Method

Prepare a JSON like the following, where each URL points to a DICOM you'd like to include in the asset. The order of the URLs will determine the order in which images will be presented to the annotator in the series.

The following JSON will import two NRRD assets:

```json
[
  {
    "externalId": "my-asset-external-id-1",
    "dataset": [
      "https://url.com/65c18c8b-4513-4a0a-b876-1aeb2e0908ec.dcm",
      "https://url.com/b0b70590-e4cc-42ef-8537-3ee3f7917fed.dcm",
      "https://url.com/38e11364-1ce0-417a-9e38-436468c555ce.dcm",
      "https://url.com/eff59355-03bd-447f-aa47-46028f90c2e6.dcm"
    ]
  },
  {
    "externalId": "my-asset-external-id-2",
    "dataset": [
      "https://url.com/65c18c8b-4513-4a0a-b876-123456789012.dcm",
      "https://url.com/b0b70590-e4cc-42ef-8537-234456566787.dcm",
      "https://url.com/38e11364-1ce0-417a-9e38-876345383488.dcm",
      "https://url.com/eff59355-03bd-447f-aa47-319485019239.dcm"
    ]
  }
]
```

From your project dashboard, go to the *Assets* tab and click on *Add Data*. Then, enter the *Cloud Storage* section and drag and drop your JSON on the file upload field.

Enable the "*Upload individual DICOM frames as single NRRD file*" checkbox on the left.

Then, press on *Upload*. Your DICOM files will be uploaded and converted into one NRRD asset.

If your DICOM files are in a private bucket, ensure you select the appropriate [storage integration](/data/storages.md) from the list on the left.

If Ango Hub cannot convert the DICOM files into an NRRD asset, the asset will remain in the *Assets* tab with a *Metadata extraction failed* status in the *Tasks* column, and no labeling task will be created for it.

## Using the File Explorer Method

From the File Explorer, select the single DICOM files you'd like to group into a series, or select the folder containing the DICOM files. Then, enable the checkbox named "*Upload individual DICOM frames as single NRRD file*". Click on *Upload*.


---

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