| abstract |
The invention relates to the field of CT technology application, and provides a CT system parameter calibration and imaging algorithm to solve the dilemma of the CT system in practical application: when the template is known as a uniform medium, template geometric information and absorption rate, determine the CT The position of the rotation center of the system in the square tray, the distance between the detector units, and the 180 directions of X-rays; use the obtained calibration parameters to determine the position, geometric shape and absorption rate of the unknown medium in the square tray; through Known calibration parameters, determine the relevant information of unknown media; discuss the accuracy and stability of parameter calibration. The invention gives certain reasonable assumptions: the sample to be tested is infinitely thin, and the parallel plate has no offset during rotation. The invention has the characteristics of high precision, and the obtained result has small error and is close to the actual value. |