%0 Journal Article
%T Fast Calculation of Simulation Projection for Cone-beam CT Based on Shepp-Logan Head Phantom<br>基于Shepp-Logan头模型的锥束CT仿真投影快速计算
%A ZHANG Shun-li
%A ZHANG Ding-hua
%A LI Xiao-lin
%A LIU Min-na
%A <br>张顺利
%A 张定华
%A 李小林
%A 刘敏娜
%J 计算机科学
%D 2012
%I 
%X Aiming at the problem of projection simulation of 3D Shepp-I_ogan head phantom, this paper proposed a fast parallel method to calculate simulation projection. Firstly, the intersection points of 3D ray and each ellipsoid were calcu- lated in turn. Then, the sequence of intersection points was sorted, by which the region number of phantom and length of intersection between the ray and the region were determined. Finally,the projection of the ray was obtained by summing the projection of each region. On this basis,we decomposed the computing task into four independent subtasks and rea- lined fast parallel calculation of simulation projection of con}beam CT on multi-core platform by multi-thread tech- nictue. Experimental result shows that the proposed method is very effective, can get a speedup about 3. 5 times on ctuad cores platform. The accuracy of the projection data generated by the proposed method was verified by results of image reconstruction.
%K Cone-beam CT
%K Shepp-Logan head phantom
%K Projection simulation
%K Multi-thread
%K Image reconstruction<br>锥束CT
%K Shepp-Logan头模型
%K 投影仿真
%K 多线程
%K 图像重建
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=64A12D73428C8B8DBFB978D04DFEB3C1&aid=4207430C62DE8EBE0ED0A3A98AD72B21&yid=99E9153A83D4CB11&vid=7C3A4C1EE6A45749&iid=94C357A881DFC066&sid=4290346F7268639E&eid=89AC6B0ADBEA2741&journal_id=1002-137X&journal_name=计算机科学&referenced_num=0&reference_num=0