The present invention is directed to an apparatus for supplying power to a rotatable x-ray tube for generation of an x-ray beam for acquisition of CT data. More concretely, at the masking unit A an interlaced mask pattern is used and a masking process is performed with respect to 2 pl dot data obtained from the dot pattern development unit 604. The compounds may also bind to and are an antagonist of the adrenergic receptor \u03b12B; or the compounds are not antagonists of the adrenergic receptor \u03b12B and the compounds are administered in conjunction with a second agent that reduces, or is expected to reduce, blood pressure in an individual.