| 摘要 |
<P>PROBLEM TO BE SOLVED: To comprehensively perform data supplement in ray cones concerning CT using the plurality of ray cones, and to evade an artifact. <P>SOLUTION: A first ray cone with a relatively larger fan angle and a second ray cone with a relatively smaller fan angle scan an object circularly or spirally. The first ray cone generates a first dataset A because of its absorption in the object, and the second ray cone generates a dataset B. The dataset B of the smaller ray cone is supplemented with other data at the edge to give an expanded dataset B+ for reconstruction of the CT representation. The expanded dataset B+ of the second, smaller ray cone and the dataset A of the first, larger ray cone is subjected to a convolution operation to give datasets B+' and A'. Finally, a back projection to reconstruct CT representations or volume data is respectively carried out from the convoluted datasets B+' and A'. <P>COPYRIGHT: (C)2007,JPO&INPIT |
