siibra.volumes.providers

Subpackage handling the digestion of different volume and mesh types

Submodules

• siibra.volumes.providers.freesurfer
• siibra.volumes.providers.gifti
• siibra.volumes.providers.neuroglancer
• siibra.volumes.providers.nifti
• siibra.volumes.providers.provider

Classes

FreesurferAnnot	Helper class that provides a standard way to create an ABC using
GiftiMesh	One or more surface mesh fragments in Gifti format.
GiftiSurfaceLabeling	A mesh labeling, specified by a gifti file.
NeuroglancerMesh	A surface mesh provided as neuroglancer precomputed mesh.
NeuroglancerProvider	Helper class that provides a standard way to create an ABC using
NiftiProvider	Helper class that provides a standard way to create an ABC using
ZippedFreesurferAnnot	Helper class that provides a standard way to create an ABC using

Package Contents

class siibra.volumes.providers.FreesurferAnnot(url: str | dict)

Helper class that provides a standard way to create an ABC using inheritance.

fetch(fragment: str = None, label: int = None, **kwargs)

Returns a 1D numpy array of label indices.

abstract get_boundingbox(clip=False, background=0.0) → siibra.locations.boundingbox.BoundingBox

class siibra.volumes.providers.GiftiMesh(url: str | Dict[str, str], volume=None)

One or more surface mesh fragments in Gifti format.

fetch(fragment: str = None, **kwargs)

Returns the mesh as a dictionary with two numpy arrays.

Parameters:

fragment (str, default: None) –

A fragment name can be specified to choose from multiple fragments.

Note

If not specified, multiple fragments will be merged into one mesh. In such a case, the verts and faces arrays of different fragments are appended to one another.

Returns:

• ‘verts’: An Nx3 array of vertex coordinates,

• ’faces’: an Mx3 array of face definitions using row indices of the vertex array

Return type:

dict

fetch_iter()

Iterator returning all submeshes

Returns:

• ‘verts’: An Nx3 array of vertex coordinates,

• ’faces’: an Mx3 array of face definitions using row indices of the vertex array

• ’name’: Name of the of the mesh variant

Return type:

dict

abstract get_boundingbox(clip=False, background=0.0, **fetch_kwargs) → siibra.locations.boundingbox.BoundingBox

Bounding box calculation is not yet implemented for meshes.

property fragments

property variants

volume = None

class siibra.volumes.providers.GiftiSurfaceLabeling(url: str | dict)

A mesh labeling, specified by a gifti file.

fetch(fragment: str = None, label: int = None, **kwargs)

Returns a 1D numpy array of label indices.

abstract get_boundingbox(clip=False, background=0.0) → siibra.locations.boundingbox.BoundingBox

class siibra.volumes.providers.NeuroglancerMesh(resource: str | dict, volume=None)

A surface mesh provided as neuroglancer precomputed mesh.

fetch(label: int, fragment: str)

Fetches a particular mesh. Each mesh is a dictionary with keys:

Parameters:

• label (int) – Label of the volume

• fragment (str, default: None) –

  A fragment name can be specified to choose from multiple fragments.

  Note

  If not specified, multiple fragments will be merged into one mesh. In such a case, the verts and faces arrays of different fragments are appended to one another.

Returns:

• ‘verts’: An Nx3 array of vertex coordinates (in nanometer)

• ’faces’: an MX3 array containing connection data of vertices

• ’name’: Name of the of the mesh variant

Return type:

dict

abstract get_boundingbox(clip=False, background=0.0, **fetch_kwargs) → siibra.locations.boundingbox.BoundingBox

Bounding box calculation is not yet implemented for meshes.

volume = None

class siibra.volumes.providers.NeuroglancerProvider(url: str | Dict[str, str])

Helper class that provides a standard way to create an ABC using inheritance.

fetch(fragment: str = None, resolution_mm: float = None, voi: siibra.locations.boundingbox.BoundingBox = None, **kwargs) → nibabel.Nifti1Image

Fetch 3D image data from neuroglancer volume.

Parameters:

• fragment (str, optional) – The name of a fragment volume to fetch, if any. For example, some volumes are split into left and right hemisphere fragments. See fragments()

• resolution_mm (float, default: None (i.e, lowest)) – Desired resolution in millimeters. .. tip:: Set to -1 to get the highest resolution. (might need to set max_bytes)

• voi (BoundingBox) – optional specification of a volume of interest to fetch.

• max_bytes (float: Default: NeuroglancerVolume.MAX_BYTES) – Maximum allowable size (in bytes) for downloading the image. siibra will attempt to find the highest resolution image with a size less than this value.

get_boundingbox(**fetch_kwargs) → siibra.locations.boundingbox.BoundingBox

Return the bounding box in physical coordinates of the union of fragments in this neuroglancer volume.

Parameters:

fetch_kwargs – key word arguments that are used for fetching volumes, such as voi or resolution_mm.

class siibra.volumes.providers.NiftiProvider(src: str | Dict[str, str] | nibabel.Nifti1Image | Tuple[numpy.ndarray, numpy.ndarray])

Helper class that provides a standard way to create an ABC using inheritance.

fetch(fragment: str = None, voi: siibra.locations.boundingbox.BoundingBox = None, label: int = None)

Loads and returns a Nifti1Image object

Parameters:

• fragment (str) – Optional name of a fragment volume to fetch, if any. For example, some volumes are split into left and right hemisphere fragments. see fragments()

• voi (BoundingBox) – optional specification of a volume of interest to fetch.

• label (int, default: None) – Optional: a label index can be provided. Then the mask of the 3D volume will be returned, where voxels matching this label are marked as “1”.

find_peaks(min_distance_mm=5)

Find peaks in the image data.

Parameters:

• min_distance_mm (float) – Minimum distance between peaks in mm

• Returns –

• -------- –

• PointCloud –

get_boundingbox(**fetch_kwargs) → siibra.locations.boundingbox.BoundingBox

Return the bounding box in physical coordinates of the union of fragments in this nifti volume.

Parameters:

fetch_kwargs – Not used

get_shape(resolution_mm=None)

is_float()

property fragments

class siibra.volumes.providers.ZippedFreesurferAnnot(url: str | dict)

Helper class that provides a standard way to create an ABC using inheritance.

fetch(fragment: str = None, label: int = None, **kwargs)

Returns a 1D numpy array of label indices.

abstract get_boundingbox(clip=False, background=0.0) → siibra.locations.boundingbox.BoundingBox