Data Correction for Gantry-tilted Local CT

Gantry-tilted helical multi-slice computed tomography (CT) refers to the helical scanning CT system equipped with multi-row detector operating at some gantry tilting angle. Its purpose is to avoid the area which is vulnerable to the X-ray radiation. The local tomography is to reduce the total radiation dose by only scanning the region of interest for image reconstruction. In this paper we consider the scanning scheme, and incorporate the local tomography technique with the gantry-tilted helical multi-slice CT. The image degradation problem caused by gantry tilting is studied, and a new error correction method is proposed to deal with this problem in the local CT. Computer simulation shows that the proposed method can enhance the local imaging performance in terms of image sharpness and artifacts reduction

[1]  Katsuyuki Taguchi,et al.  Feldkamp-based cone-beam reconstruction for gantry-tilted helical multislice CT. , 2003, Medical physics.

[2]  H Hu,et al.  Multi-slice helical CT: scan and reconstruction. , 1999, Medical physics.

[3]  K. J. Ray Liu,et al.  Wavelet-based multiresolution local tomography , 1997, IEEE Trans. Image Process..

[4]  K. J. Ray Liu,et al.  Local tomography in fan-beam geometry using wavelets , 1996, Proceedings of 3rd IEEE International Conference on Image Processing.

[5]  Hiroyuki Kudo,et al.  General reconstruction theory for multislice X-ray computed tomography with a gantry tilt , 2004, IEEE Transactions on Medical Imaging.

[6]  Yoram Bresler,et al.  Multiresolution tomographic reconstruction using wavelets , 1994, Proceedings of 1st International Conference on Image Processing.

[7]  Tim Olson,et al.  Wavelet localization of the Radon transform , 1994, IEEE Trans. Signal Process..

[8]  Jens Krause,et al.  Spiral Interpolation Algorithms for Multi-Slice Spiral CT Part I: Theory , 2000, IEEE Trans. Medical Imaging.

[9]  G. Wang,et al.  A general cone-beam reconstruction algorithm , 1993, IEEE Trans. Medical Imaging.

[10]  Katsuyuki Taguchi,et al.  Tilted helical Feldkamp cone-beam reconstruction algorithm for multislice CT , 2003, SPIE Medical Imaging.

[11]  J. Hsieh.  Tomographic reconstruction for tilted helical multislice CT , 2000, IEEE Trans. Medical Imaging.

[12]  K. Taguchi,et al.  Algorithm for image reconstruction in multi-slice helical CT. , 1998, Medical physics.

[13]  Stefan Schaller,et al.  A new approximate algorithm for image reconstruction in cone-beam spiral CT at small cone-angles , 1996, 1996 IEEE Nuclear Science Symposium. Conference Record.