Title :
Data Correction for Gantry-tilted Local CT
Author :
Liang, Hongzhu ; Zhang, Cishen ; Yan, Ming ; Zhou, Jiayin
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ.
Abstract :
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
Keywords :
computerised tomography; error correction; image reconstruction; medical image processing; artifacts reduction; data correction; error correction method; gantry-tilted helical multi-slice computed tomography; gantry-tilted local CT; helical scanning CT system; image degradation; image reconstruction; image sharpness; multirow detector; Chemical technology; Computed tomography; Computer simulation; Degradation; Detectors; Error correction; Geometry; Image quality; Image reconstruction; X-ray imaging;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1616797
