Data correction for gantry-tilted local CT

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• 作者：Hongzhu Liang ; Cishen Zhang ; Ming Yan
• 关键词：Computed tomography ; Helical CT ; Gantry-tilted CT ; Local tomography
• 刊名：Computerized Medical Imaging and Graphics
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：32
• 期：4
• 页码：251-257
• 全文大小：822 K

文摘

The gantry-tilted helical cone-beam computed tomography (CT) has an inherent problem that the relative shift of the region of interest (ROI) blurs the reconstructed image. This problem becomes more serious in the gantry-tilted local CT imaging due to the nature of local scanning. This paper proposes a new method to improve the gantry-tilted local imaging by correcting the local scanning data. Computer simulations show that the proposed method can enhance the local imaging performance to a certain extent in terms of the image sharpening and artifacts reduction.