Frank Dennerlein;Stefan Hoppe;Markus Kowarschik;Holger Scherl
发明人:
Frank Dennerlein,Stefan Hoppe,Markus Kowarschik,Holger Scherl
申请号：
US12772793
公开号：
US08619944B2
申请日:
2010.05.03
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.
