A beam-filter-based low-dose imaging for multi-detector-row helical CT

Sunho Lim; Subong Hyun; Chanyoung Oh; Seungryong Cho

doi:10.1117/12.2612801

4 April 2022 A beam-filter-based low-dose imaging for multi-detector-row helical CT

Sunho Lim, Subong Hyun, Chanyoung Oh, Seungryong Cho

Proceedings Volume 12031, Medical Imaging 2022: Physics of Medical Imaging; 120312M (2022) https://doi.org/10.1117/12.2612801
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

Conference Poster

Abstract

Low-dose CT has been investigated and employed in various forms for clinical practices. One of the viable options for low-dose imaging is using a multi-slit beam collimator to achieve a sparse sampling. We have earlier demonstrated the feasibility of such technique, and extended the method for dual-energy imaging from a single scan using a multi-slit beam-filter in the circular CBCT system. Multi-detector-row helical CT is indeed in wide use in the clinics. In this work, we continue to explore the beam-filter based imaging technique in the multi-row helical CT scans. We conducted a simulation study by applying a virtual filter to the real data acquired from a helical CT scanner. We separated the sinograms of each row from the multi-row helical CT data, and removed the streaks using a notch filter in the Fourier domain of each sinogram. We then reconstructed the image by use of the filtered-backprojection algorithm and reduced the image noise by applying l0-norm based smoothing.

Conference Presentation

Citation Download Citation

Sunho Lim, Subong Hyun, Chanyoung Oh, and Seungryong Cho "A beam-filter-based low-dose imaging for multi-detector-row helical CT", Proc. SPIE 12031, Medical Imaging 2022: Physics of Medical Imaging, 120312M (4 April 2022); https://doi.org/10.1117/12.2612801

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