Korean J Med Phys.
2010 Dec;21(4):360-366.
Digital Tomosynthesis for Patient Alignment System Using Half-fan Mode CBCT Projection Images
- Affiliations
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- 1Department of Radiation Oncology, Asan Medical Center, Seoul, Korea.
- 2Department of Radiation Oncology, Samsung Medical Center, Seoul, Korea. Jinsung.k@gmail.com
- 3Department of Radiation Oncology, University of California, San Diego, USA. wysung@ucsd.edu
Abstract
- To generate on-board digital tomosynthesis (DTS) for three-dimensionalimage-guided radiation therapy (IGRT) as an alternative to conventional portal imaging or on-board cone-beam computed tomography (CBCT), two clinical cases (liver and bladder) were selected to illustrate the capabilities of on-board DTS for IGRT. DTS images were generated from subsets of CBCT projection data (45, 162 projections) using half-fan mode scanning with a Feldkamp-type reconstruction algorithm. Digital tomosynthesis slices appeared similar to coincident CBCT planes and yielded substantially more anatomic information. Improved bony and soft-tissue visibility in DTS images is likely to improve target localization compared with radiographic verification techniques and might allow for daily localization of a soft-tissue target. Digital tomosynthesis might allow targeting of the treatment volume on the basis of daily localization.
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