Method and device for processing security check CT (Computed Tomography) reconstructed image

Abstract

The invention discloses a method and a device for processing a security check CT (Computed Tomography) reconstructed image. According to the method, projection data collected by a security check CT wide-row detector is subjected to inter-row expansion, the pixel height after expansion becomes half of the pixel height before expansion, and the expansion row data is obtained through correlation calculation according to two rows of projection data closest to the expansion row data; and iterative inter-row data expansion is performed on the projection data according to the row spacing and the actual pixel width until the pixel height of the expanded projection data is smaller than or equal to the actual pixel width. A CT image processing device comprises a data acquisition module, a wide-row CT projection data expansion module and a reconstruction module. The invention has the advantages that the expanded projection data is used for reconstruction without changing existing scanning conditions, the axial data sampling rate is increased, windmill artifacts are greatly reduced, and the quality of reconstructed images is obviously improved.

Description

technical field [0001] The present invention relates to the technical field of security inspection CT imaging, in particular to a processing method and device for CT (Computed Tomography, electronic computer tomography) reconstructed image. Background technique [0002] At present, security inspection CT generally uses multi-row detectors for spiral trajectory scanning. The CT acquisition system is mainly composed of X-ray light sources, detectors (including plane and arc surfaces), conveyor belts and slip rings. The slip ring rotates around the detected object synchronously, and the light source emits X-rays, which are restricted by the collimator. Only the rays within the required range pass through the collimator, scan the detected object, and reach the receiving area of ​​the detector. After the data acquisition system collects the detector data, the tomographic slice of the detected object is reconstructed through the reconstruction algorithm. [0003] The use of multi...

AI Technical Summary

Problems solved by technology

The appearance of windmill artifacts will reduce the quality of CT reconstruction images, thereby affecting the accuracy of security inspectors in judging whether the inspected items are dangerous based on the images

[0005] In the current related technology, the method of increasing the axial sampling rate is usually used to remove the windmill artifact, but this method requires the equipment to have hardware that supports high axial sampling rate, the equipment price is high, and the cost is high; another method is to start from the software , to remove the windmill artifact through the algorithm. The current main algorithm is to post-process the image to remove the windmill artifact. This image post-processing algorithm has high complexity and low operating efficiency.

Images