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J Korean Soc Ther Radiol Oncol > Volume 28(4); 2010 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2010;28(4): 224-230. doi: https://doi.org/10.3857/jkstro.2010.28.4.224
Evaluation of Scatter Reduction Effect of the Aft-Multiple-Slit (AMS) System Using MC Simulation
Jina Chang, Tae Suk Suh, Doh Yun Jang, Hong Seok Jang, Siyong Kim
1Department of Biomedical Engineering, The Catholic University of Korea School of Medicine, Seoul, Korea. suhsanta@catholic.ac.kr
2Department of Nuclear Engineering, Hanyang University, Seoul, Korea.
3Department of Radiation Oncology, Seoul St.Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.
4Department of Radiation Oncology, Mayo Clinic, Jacksonville, FL, USA.
We designed the aft-multiple-slit (AMS) system to reduce scatter in cone-beam computed tomography (CBCT). As a preliminary study, we performed a Monte Carlo N-Particle Transport Code (MCNP) simulation to verify the effectiveness of this system.
The MCNPX code was used to build the AMS geometry. An AMS is an equi-angled arc to consider beam divergence. The scatter-reduced projection images were compared with the primary images only and the primary plus scatter radiation images with and without AMS to evaluate the effectiveness of scatter reduction. To obtain the full 2 dimensional (2D) projection image, the whole AMS system was moved to obtain closed septa of the AMS after the first image acquisition.
The primary radiation with and without AMS is identical to all the slit widths, but the profiles of the primary plus scattered radiation varied according to the slit widths in the 2D projection image. The average scatter reduction factors were 29%, 15%, 9%, and 8% when the slit widths were 5 mm, 10 mm, 15 mm, and 20 mm, respectively.
We have evaluated the scatter reduction effect of the AMS in CBCT imaging using the Monte Carlo (MC) simulations. A preliminary study based on the MCNP simulations showed a mount of scatter reduction with the proposed system.
Key Words: Aft-multiple-slit (AMS), Scatter reduction, Cone-beam CT (BCT)
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