3D data objects: the data3d module

astra.data3d.change_geometry(i, geometry)[source]

Change the geometry of a 3D object.

Parameters
  • i (int) – ID of object.

  • geometry (dict) – Volume or projection geometry.

astra.data3d.clear()[source]

Clear all 3D data objects.

astra.data3d.create(datatype, geometry, data=None)[source]

Create a 3D object.

Parameters
  • datatype (string) – Data object type, ‘-vol’ or ‘-sino’.

  • geometry (dict) – Volume or projection geometry.

  • data (float or numpy.ndarray) – Data to fill the constructed object with, either a scalar or array.

Returns

int – the ID of the constructed object.

astra.data3d.delete(ids)[source]

Delete a 2D object.

Parameters

ids (int or list) – ID or list of ID’s to delete.

astra.data3d.dimensions(i)[source]

Get dimensions of a 3D object.

Parameters

i (int) – ID of object.

Returns

tuple – dimensions of object with ID i.

astra.data3d.get(i)[source]

Get a 3D object.

Parameters

i (int) – ID of object to get.

Returns

numpy.ndarray – The object data.

astra.data3d.get_geometry(i)[source]

Get the geometry of a 3D object.

Parameters

i (int) – ID of object.

Returns

dict – The geometry of object with ID i.

astra.data3d.get_shared(i)[source]

Get a 3D object with memory shared between the ASTRA toolbox and numpy array.

Parameters

i (int) – ID of object to get.

Returns

numpy.ndarray – The object data.

astra.data3d.get_single(i)[source]

Get a 3D object in single precision.

Parameters

i (int) – ID of object to get.

Returns

numpy.ndarray – The object data.

astra.data3d.info()[source]

Print info on 3D objects in memory.

Link a 3D numpy array with the toolbox.

Parameters
  • datatype (string) – Data object type, ‘-vol’ or ‘-sino’.

  • geometry (dict) – Volume or projection geometry.

  • data (numpy.ndarray) – Numpy array to link

Returns

int – the ID of the constructed object.

astra.data3d.store(i, data)[source]

Fill existing 3D object with data.

Parameters
  • i (int) – ID of object to fill.

  • data (float or numpy.ndarray) – Data to fill the object with, either a scalar or array.