A compressor includes pistons, each of which is coupled to a swash plate through a pair of shoes. One application is for delivery of therapeutic catheters to the carotid or cerebral arteries via access from the radial or brachial artery. The queuing system generates the cell memory address of each stored cell when the cell is to be forwarded from the cell memory, and the data path controller appends the cell memory address of that cell to a linked list of addresses of cells to be forwarded from the memory. The supporting element includes a supporting base and a buffer element. The two values are summed to provide an ISI compensation signal at the input of a decision device such as a slicer. The imaging conditions are for example directed to parallel MR imaging.