Issue with using using show_geometry on a slice obtained with get_slice

[lauramurgatroyd]

Using the seeds in a box dataset (which is conebeam):

I applied transmission to absorption conversion and then tried to get a slice and show the geometry with the following code:

data_absorption.reorder(order='tigre')
data_slice = data_absorption.get_slice(vertical='centre')
print(data_slice.geometry)
show_geometry(data_slice.geometry, data_slice.geometry.get_ImageGeometry())

fdk =  FDK(data_slice)
recon_slice = fdk.run()
show2D(recon)

printing the geometry gives:
2D Cone-beam tomography
System configuration:
	Source position: [   0.    , -261.3065]
	Rotation axis position: [0., 0.]
	Detector position: [  0.    , 850.4165]
	Detector direction x: [1., 0.]
Panel configuration:
	Number of pixels: [1000    1]
	Pixel size: [0.4 0.4]
	Pixel origin: top-right
Channel configuration:
	Number of channels: 1
Acquisition description:
	Number of positions: 1571
	Angles 0-20 in degrees:
[180.     , 179.77084, 179.54169, 179.31255, 179.08339, 178.85423,
 178.62508, 178.39592, 178.16678, 177.93762, 177.70847, 177.47931,
 177.25015, 177.02101, 176.79185, 176.5627 , 176.33354, 176.10439,
 175.87524, 175.64609]

I get the following:

[gfardell]

closed by #1492