Title :
Geometric Calibration of a Micro-CT System and Performance for Insect Imaging
Author :
Hu, Zhanli ; Gui, Jianbao ; Zou, Jing ; Rong, Junyan ; Zhang, Qiyang ; Zheng, Hairong ; Xia, Dan
Author_Institution :
Paul Lauterbur Center for Biomed. Imaging Res., Chinese Acad. of Sci., Shenzhen, China
fDate :
7/1/2011 12:00:00 AM
Abstract :
Micro-CT with a high spatial resolution in combination with computer-based-reconstruction techniques is considered a powerful tool for morphological study of insects. The quality of CT images crucially depends on the precise knowledge of the scan geometry of the micro-CT system. In this paper, we have proposed a method to calculate the deviation of rotating axis for compensating deficiency of existing methods. A practical application of this geometric calibration method of the micro-CT system for insect imaging is presented. We have performed the computer-simulation study and experimental study with our prototype micro-CT system. The results demonstrate that the proposed technique is accurate and robust. In addition, we have evaluated the imaging characteristics of the detector in terms of modulation-transfer function (MTF). Finally, insect imaging performance and image reconstruction from data acquired with different energies are presented.
Keywords :
calibration; computerised tomography; image reconstruction; image resolution; medical image processing; computer-based-reconstruction technique; geometric calibration; insect imaging; microCT system; modulation transfer function; rotating axis deviation; spatial resolution; Calibration; Computed tomography; Detectors; Image reconstruction; Insects; X-ray imaging; Geometric calibration; insect imaging; micro-CT; modulation-transfer function (MTF); Algorithms; Animals; Calibration; Image Processing, Computer-Assisted; Insects; Phantoms, Imaging; X-Ray Microtomography;
Journal_Title :
Information Technology in Biomedicine, IEEE Transactions on
DOI :
10.1109/TITB.2011.2159012