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The deformation of the therapeutic couch due to the laying of patients always from the one side of the couch. (a) Photography of the area where recess of the top of the couch was observed (in circle), (b) transversal visualization of the couch where recess about 1.5 mm was observed (arrows), and (c) the recess area reconstructed on the basis of the MVCT images. The effect was found at the Greater Poland Cancer Centre.
