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

doi:10.1117/12.2007785

6 March 2013 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, Medical Imaging 2013: Physics of Medical Imaging; 866838 (2013) https://doi.org/10.1117/12.2007785
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

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.

Citation Download Citation

Taewon Lee, Miran Park, Yunjeong Lee, Insoo Kim, Bumsoo Han, and Seungryong Cho "Feasibility study on multiple fan-beam data acquisition for low-dose helical CT", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866838 (6 March 2013); https://doi.org/10.1117/12.2007785

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KEYWORDS

Collimators

Reconstruction algorithms

X-ray computed tomography

Collimation

Data acquisition

X-rays

Image quality

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