A kind of method includes imaging system of the detection system with blended data of reception radiation. The blended data detection system includes multiple inspection areas along horizontal axis that blended data detector array and one group of spectral detector and one group of integrated detector are arranged. This method further comprises generating one group of projection truncation spectrum and first group of spectral detector. This method further comprises estimating the integrated detector of one group of spectrum protrusion. This method further comprises combining the projection of a set of frequency spectrum of various truncation spectrum protrusions and estimation. This method further comprises estimating that one group of spectrum projection generates the projection of complete one group of frequency spectrum based on combination. This method further comprises handling complete spectrum projection to generate volumetric image data.
