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Original Article

Korean Journal of Medical Physics 2010; 21(3): 281-290

Published online September 25, 2010

Copyright © Korean Society of Medical Physics.

Optimizing Imaging Conditions in Digital Tomosynthesis for Image-Guided Radiation Therapy

영상유도 방사선 치료를 위한 디지털 단층영상합성법의 촬영조건 최적화에 관한 연구

Hanbean Youn*, Jin Sung Kim, Min Kook Cho*, Sun Young Jang*, William Y. Song, Ho Kyung Kim*

윤한빈*ㆍ김진성ㆍ조민국*ㆍ장선영*ㆍ송영재ㆍ김호경*

*School of Mechanical Engineering, Pusan National University, Busan, Department of Radiation Oncology, Samsung Medical Center, Seoul, Korea,Department of Radiation Oncology, University of California San Diego, CA, USA

*부산대학교 기계공학부, 삼성서울병원 방사선종양학과, UC 샌디에고 방사선종양학과

Abstract

Cone-beam digital tomosynthesis (CBDT) has greatly been paid attention in the image-guided radiation therapy because of its attractive advantages such as low patient dose and less motion artifact. Image quality of tomograms is, however, dependent on the imaging conditions such as the scan angle (Ղscan) and the number of projection views. In this paper, we describe the principle of CBDT based on filtered-backprojection technique and investigate the optimization of imaging conditions. As a system performance, we have defined the figure-of-merit with a combination of signal difference-to-noise ratio, artifact spread function and floating-point operations which determine the computational load of image reconstruction procedures. From the measurements of disc phantom, which mimics an impulse signal and thus their analyses, it is concluded that the image quality of tomograms obtained from CBDT is improved as the scan angle is wider than 60 degrees with a larger step scan angle (ԤՂ). As a rule of thumb, the system performance is dependent on . If the exact weighting factors could be assigned to each image-quality metric, we would find the better quantitative imaging conditions.

KeywordsImage-guided radiation therapy, Tomosynthesis, Filtered backprojection

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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