The present invention relates to monomeric bivalent phenoxy tin compounds, processes for making the phenoxy tin compounds, and processes for making polyurethanes using the tin compounds as polymerization catalysts. This new member is believed to resist flaking and other problems associated with traditional foam members. Absorption in the imaged object and also in the patient table changes as a function of the angle. The tabbed panel includes a tabbed panel core body and a first tabbed panel facesheet, the tabbed panel core body defining a first tabbed panel side with the first tabbed panel facesheet disposed thereto. A mulching plug with a forwardly extending separator vane can be inserted into the mouth of the exit tunnel to convert the deck from a dischargecollection mode of operation to a mulching mode of operation.