Abstract: A PACS including a source of medical data, such as a CT unit (20), a workstation (100) capable of creating an image of the data, and a local area network (40). A server (60) stores compressed medical data in a RAID (70) and also in a magneto-optical unit (80) and a tape DLT unit (90). The tape unit (90) has a transfer rate equal to or greater than the transfer rate of the RAID.

Abstract: A method and apparatus are disclosed for reducing variation in a spot size of an electron beam at a target due to multipole aberrations in an electron beam tomography (EBT) scanner. A magnitude of a DC voltage applied to a positive ion electrode (PIE) within the EBT scanner is adjusted and an orientation of a non-circular aperture of the PIE is aligned with respect to the electron beam. A profile of the spot size is monitored while adjusting the magnitude of the DC voltage and while aligning the orientation of the non-circular aperture of the PIE until the variation in the spot size is sufficiently reduced.