Abstract
Maximum information is obtained from angiography if all radiographic images extraneous to the organ under study can be eliminated. This aim is achieved by the combined use of serial angiotomography and photographic subtraction of the resulting radiographs. A tomographic unit with linked serial cassette changer incorporates six multisection cassettes. Each complete tomographic cycle takes 1·4 seconds, making it possible to obtain serial angiotomograms in arterial, parenchymal and venous phases. By arranging the first radiographic exposure before the automatically triggered contrast injection, a set of subtraction blanks is obtained to allow photographic subtraction of each angiotomographic layer. The application of the method is illustrated by the use of a phantom and by clinical examples.
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