An imaging method comprises the steps of: putting an object in a detection region, and biasing a detector (1-8) relative to the object； moving an imaging system along a longitudinal Z axis, enabling a ray source (1-7) and the detector (1-8) to synchronously perform circular movement around the object, performing scanning and data collection, and supplementing the data； and reconstructing the collected data to obtain a complete object image. The imaging method combines detector biasing and spiral scanning, solves the problem that an image splicing method used in conventional CT imaging generates artifacts, reduces the usage area of the detector, and reduces system cost.
