Fast katsevich algorithm based on GPU for helical cone-beam computed tomography

Katsevich reconstruction algorithm represents a breakthrough for helical cone-beam computed tomography (CT) reconstruction, because it is the first exact cone-beam reconstruction algorithm of filtered backprojection (FBP) type with 1-D shiftinvariant filtering. Although FBP-type reconstruction algorithm is effective, 3-D CT reconstruction is time-consuming, and the accelerations of Katsevich algorithm on CPU or cluster have been widely studied. In this paper, Katsevich algorithm is accelerated by using graphics processing unit, including flat-detector and curveddetector geometry in the case of helical orbit. An overscan formula is derived, which helps to avoid unnecessary overscan in practical CT scanning. Based on the overscan formula, a volume-blocking method in device memory is proposed. One advantage of the blocking method is that it can reconstruct large volume with high speed.

• Type: Journal
• Year: 2010
• Where: TITB
• Authors: Guorui Yan, Jie Tian, Shouping Zhu, Chenghu Qin, Yakang Dai, Fei Yang, Di Dong, Ping Wu
• Keywords: Education, Katsevich Algorithm, Katsevich Reconstruction Algorithm, Reconstruction Algorithm, TITB 2010