A method for the correction of registration of radiography images comprises means to determine a residual rigid transformation in comparing the pre-operation 3D image with a fluoroscopic image. The present invention relates to a vacuum thermal insulation material which comprises a core material and an envelope in which the core material is sealed. A plasticiser having a desirable combination of high liquid volume resistivity, low amount of light ends and low carbonyl number is obtained. The date on the form includes, in many embodiments, \u201cDate Mailed.