Dr. Insu Kim Profile

Dr. Insu Kim

at KAIST

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Proceedings Article | 6 March 2013 Paper

Feasibility study on multiple fan-beam data acquisition for low-dose helical CT

Taewon Lee, Miran Park, Yunjeong Lee, Insoo Kim, Bumsoo Han, Seungryong Cho

Proceedings Volume 8668, 866838 (2013) https://doi.org/10.1117/12.2007785

KEYWORDS: Collimators, X-ray computed tomography, Reconstruction algorithms, Collimation, Data acquisition, X-rays, Image quality, Image restoration, Switching, Computer simulations

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In computed tomography (CT) imaging, radiation dose delivered to the patient is one of the major concerns. Many CT developers and researchers have been making efforts to reduce radiation dose. Sparse-view CT takes projections at sparser view-angles and provides a viable option to reducing radiation dose. However, a fast power switching of an x-ray tube, which is needed for the sparse-view sampling, can be challenging in many CT systems. We have recently proposed a novel alternative approach to sparse-view circular CT that can be readily incorporated in the existing CT systems. Instead of switching the x-ray tube power, we proposed to use a multi-slit collimator placed between the x-ray source and the patient to partially block the x-ray beam thereby reducing the radiation. In this study, we performed a simulation study based on numerically acquired projection data to demonstrate a feasibility of using a multi-slit collimator in a helical CT. The XCAT phantom was used and a numerical collimator has been made to apply on the projection data. Numerical multi-slit collimator was designed to have equal size of slit-openings and radio-opaque rectangular areas, and the length dimension of the slits is perpendicular to the rotation axis. For image reconstruction, we used a total-variation minimization (TV) algorithm which has shown its out-performance in many sparse-view CT applications. We demonstrated that the proposed multiple fan-beam helical CT can provide a useful low-dose scanning option.

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