X-Ray versus Light Field centres difference

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IQI Fields Centres Difference ROIs.png
IQI Fields Centres Difference legend.png

In the example figures above, the witdh is vertical because the test object is rotated by 90°

From the positions of the two fields (X-Ray and Light) the differences of centres on width and height directions are calculated. The difference has a sign: positive values mean that the X-Ray field centre is on the right/lower than the light field centre.


Centres difference on width = :$ CW_X - CW_L $

Centres difference on height = :$ CH_X - CH_L $


where:

$ CW_X $ = Centre on width of the X-Ray field
$ CW_L $ = Centre on width of the light field
$ CH_X $ = Centre on height of the X-Ray field
$ CH_L $ = Centre on height of the light field