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As a means of non-destructive testing,CT detection can be used as a common auxiliary method in concrete structure and material design.However,with the increasing requirements of in-situ testing,conventional CT testing can no longer meet the requirements.In order to meet the in-situ testing requirements of engineering design and post-inspection,a CT detection imaging method that does not require fixed orbits is proposed.This paper implements the method under the condition of indefinite orbit CT scanning.