ct image reconstruction method

Abstract

The present invention provides a CT image reconstruction method, comprising the following steps: performing CT scanning on the air to obtain air data at various angles and the intensity values ​​of X-rays received by the edge detector channel, the air data including the X-rays received by the detector The intensity value of the edge detector channel is located on both sides of the detector; under the same scanning protocol, CT scanning is performed on the phantom to obtain the raw data of the phantom at each angle and the intensity of X-rays received by the edge detector channel value, the phantom raw data includes the intensity value of the X-ray received by the detector; respectively judge whether the edge detector channel is blocked when scanning the phantom and determine the edge channel value at each angle; use the detection when sweeping air at each angle The X-ray intensity value and edge channel value received by the detector are used to correct the raw data of the phantom to obtain air-corrected data at various angles; image reconstruction is performed using the air-corrected data at various angles to obtain CT reconstruction images.

Description

【Technical field】 [0001] The invention relates to the technical field of medical image processing, in particular to a CT image reconstruction method. 【technical background】 [0002] Computed Tomography (CT) imaging, which is clinically used for disease diagnosis, uses X-rays to irradiate the human body to obtain X-rays passing through various parts of the human body according to the principle that different tissues or organs in the human body have different degrees of attenuation of X-rays. The attenuated image of the tissue, and the use of the image for disease diagnosis. CT scanning equipment currently used for CT imaging generally includes a frame with a detection chamber for the object to be detected to enter and exit, a ball tube arranged on the frame for emitting X-rays, and a detection device arranged on the frame opposite to the ball tube. A detector array and a computer electrically connected to the detector array. The detector array is used to receive X-rays pass...

AI Technical Summary

Problems solved by technology

[0005] Although the existing CT equipment can install the reference detector on the rack to complete the air correction step in the CT image reconstruction process to ensure the quality of the CT image reconstruction, there will be problems due to the limited installation space in the rack and the installation of the reference detector. When using a detector, it is also necessary to install a circuit connected to the reference detector, which increases the difficulty of system installation, and also leads to higher cost of CT equipment

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