US 11,717,246 B2
Method to generate localizer radiograph by rotating projections with fan beam
Xiang Wen, Shanghai (CN); Yi Tian, Shanghai (CN); Tao Tao Li, Shanghai (CN); Guo Qing Zhang, Shanghai (CN); and Wen Hao Chen, Shanghai (CN)
Assigned to Siemens Healthcare GmbH, Erlangen (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Mar. 4, 2021, as Appl. No. 17/192,432.
Claims priority of application No. 202010146061.4 (CN), filed on Mar. 5, 2020.
Prior Publication US 2021/0275122 A1, Sep. 9, 2021
Int. Cl. A61B 6/00 (2006.01); G06T 11/00 (2006.01); A61B 6/03 (2006.01)
CPC A61B 6/488 (2013.01) [G06T 11/005 (2013.01); A61B 6/032 (2013.01); A61B 6/4258 (2013.01); G06T 2211/436 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A medical image generation method, comprising:
acquiring projection data of a scanned object during rotation of a radiographic source; and
generating a scout image of the scanned object in one scanning direction using corresponding projection data in two opposite scanning directions in the projection data, generating the scout image including extracting corresponding equivalent projection data in a second scanning direction from the corresponding projection data in a first direction range of a first scanning direction and inserting equivalent projection data into the corresponding projection data in the second scanning direction, wherein the second scanning direction is opposite to the first scanning direction, the one scanning direction being used to represent a relative position relationship between the radiographic source and the scanned object, wherein extracting the corresponding equivalent projection data includes:
for each scanning direction of a plurality of scanning directions in the first direction range, extracting corresponding line projection data of one ray sub-beam from the corresponding projection data in the scanning direction, the ray sub-beam being a collection of rays of ray beam emitted from the radiographic source in the scanning direction, with an included angle between the projection of the rays on a plane of a gantry and a plane where a scanning table is located within a preset angle range, and
re-sorting the extracted line projection data to obtain the equivalent projection data.