2D data objects: the data2d module

astra.data2d.change_geometry(i, geom)

Change the geometry of a 2D object.

Parameters:

• i (int) – ID of object.

• geom (dict) – new geometry.

astra.data2d.clear()

Clear all 2D data objects.

astra.data2d.create(datatype, geometry, data=None)

Create a 2D 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.data2d.delete(ids)

Delete a 2D object.

Parameters:

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

astra.data2d.get(i)

Get a 2D object.

Parameters:

i (int) – ID of object to get.

Returns:

numpy.ndarray – The object data.

astra.data2d.get_geometry(i)

Get the geometry of a 2D object.

Parameters:

i (int) – ID of object.

Returns:

dict – The geometry of object with ID i.

astra.data2d.get_shared(i)

Get a 2D 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.data2d.get_single(i)

Get a 2D object in single precision.

Parameters:

i (int) – ID of object to get.

Returns:

numpy.ndarray – The object data.

astra.data2d.info()

Print info on 2D objects in memory.

astra.data2d.link(datatype, geometry, data)

Link a 2D 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.data2d.shepp_logan(geometry, modified=True, returnData=True)

Create a 2D data object with a Shepp-Logan phantom.

Parameters:

• geometry – Volume geometry

• modified – If False, generate the original Shepp-Logan phantom

• returnData – If False, only return the ID of the new data object

Returns:

int or (int, :class`numpy.ndarray`)

astra.data2d.store(i, data)

Fill existing 2D 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.