Exact consideration of data redundancies for spiral cone-beam CT

被引:0
作者
Lauritsch, G [1 ]
Katsevich, A [1 ]
Hirsch, M [1 ]
机构
[1] Siemens Med Solut, D-91301 Forchheim, Germany
来源
MEDICAL IMAGING 2004: IMAGE PROCESSING, PTS 1-3 | 2004年 / 5370卷
关键词
image reconstruction; computed tomography; spiral CT; cone-beam; theoretically exact; filtered backprojection algorithm; reduced pitch; data redundancy;
D O I
10.1117/12.535249
中图分类号
TB8 [摄影技术];
学科分类号
0804 ;
摘要
In multi-slice spiral computed tomography (CT) there is an obvious trend in adding more and more detector rows. The goals are numerous: volume coverage, isotropic spatial resolution, and speed. Consequently, there will be a variety of scan protocols optimizing clinical applications. Flexibility in table feed requires consideration of data redundancies to ensure efficient detector usage. Until recently this was achieved by approximate reconstruction algorithms only. However, due to the increasing cone angles there is a need of exact treatment of the cone beam geometry. A new, exact and efficient 3-PI algorithm for considering three-fold data redundancies was derived from a general, theoretical framework based on 3D Radon inversion using, Grangeat's formula. The 3-PI algorithm possesses a simple and efficient structure. This publication deals with a thorough evaluation of the performance of the 3-PI algorithm in comparison to the I-PI method for non-redundant data. Image quality of the 3-PI algorithm is superior. The prominent spiral artifacts and other discretization artifacts are significantly reduced due to averaging effects when taking into account redundant data. Certainly signal-to-noise ratio is increased. The computational expense is comparable even to that of approximate algorithms. The 3-PI algorithm proves its practicability for applications in medical imaging.
引用
收藏
页码:2034 / 2045
页数:12
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