| http://www.w3.org/ns/prov#value | - at N angles of said rotation, where N represents a positive integer not less than 2, (2) second processing means, connected to said first processing means, for summing successive n sets of back-projection matrix data, among N sets of back-projection matrix data, and for successively providing summed data, where n is a positive integer not less than 2, (3) image memory means for temporarily storing
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