A multi-source inverse-geometry CT system: initial results with an 8 spot x-ray source array

被引:20
|
作者
Baek, Jongduk [1 ]
De Man, Bruno [2 ]
Uribe, Jorge [2 ]
Longtin, Randy [2 ]
Harrison, Daniel [2 ]
Reynolds, Joseph [2 ]
Neculaes, Bogdan [2 ]
Frutschy, Kristopher [2 ]
Inzinna, Louis [2 ]
Caiafa, Antonio [2 ]
Senzig, Robert [3 ]
Pelc, Norbert J. [4 ,5 ]
机构
[1] Yonsei Univ, Sch Integrated Technol, Inchon 406840, South Korea
[2] GE Global Res, Niskayuna, NY USA
[3] GE Healthcare, Waukesha, WI USA
[4] Stanford Univ, Dept Bioengn, Stanford, CA 94305 USA
[5] Stanford Univ, Dept Radiol, Stanford, CA 94305 USA
来源
PHYSICS IN MEDICINE AND BIOLOGY | 2014年 / 59卷 / 05期
关键词
CT; inverse geometry; multiple source array; image quality; NOISE POWER SPECTRUM; COMPUTED-TOMOGRAPHY; RECONSTRUCTION;
D O I
10.1088/0031-9155/59/5/1189
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
We present initial experimental results of a rotating-gantry multi-source inverse-geometry CT (MS-IGCT) system. The MS-IGCT system was built with a single module of 2 x 4 x-ray sources and a 2D detector array. It produced a 75 mm in-plane field-of-view (FOV) with 160 mm axial coverage in a single gantry rotation. To evaluate system performance, a 2.5 inch diameter uniform PMMA cylinder phantom, a 200 mu m diameter tungsten wire, and a euthanized rat were scanned. Each scan acquired 125 views per source and the gantry rotation time was 1 s per revolution. Geometric calibration was performed using a bead phantom. The scanning parameters were 80 kVp, 125 mA, and 5.4 mu s pulse per source location per view. A data normalization technique was applied to the acquired projection data, and beam hardening and spectral nonlinearities of each detector channel were corrected. For image reconstruction, the projection data of each source row were rebinned into a full cone beam data set, and the FDK algorithm was used. The reconstructed volumes from upper and lower source rows shared an overlap volume which was combined in image space. The images of the uniform PMMA cylinder phantom showed good uniformity and no apparent artifacts. The measured in-plane MTF showed 13 lp cm(-1) at 10% cutoff, in good agreement with expectations. The rat data were also reconstructed reliably. The initial experimental results from this rotating-gantry MS-IGCT system demonstrated its ability to image a complex anatomical object without any significant image artifacts and to achieve high image resolution and large axial coverage in a single gantry rotation.
引用
收藏
页码:1189 / 1202
页数:14
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