Computed tomography imaging method and apparatus

A computed tomography imaging apparatus, characterized by comprising:

• a first scanning unit that pre-scans an examined site by using an incomplete detector at a pitch factor of greater than 3 to obtain first data, wherein the incomplete detector includes detector missing portions partial off-center detector modules of which are removed from a plurality of detector modules arranged in an array;
• a second scanning unit that axially scans the examined site using the incomplete detector to obtain second data;
• a first processing unit that stitches the first data and the second data to obtain third data;
• a second processing unit that compensates the third data to obtain compensated third data;
• and
• an image reconstruction unit that performs image reconstruction by using the compensated third data to obtain a scanned image, wherein the second processing unit includes a calculating unit that calculates reference data of the first data and the second data in a reference data region and a first compensation unit that compensates data of the third data corresponding to the detector missing portions by using the reference data to obtain the compensated third data.