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Proceedings Paper

Respiratory-gated segment reconstruction for radiation treatment planning using 256-slice CT-scanner during free breathing
Author(s): Shinichiro Mori; Masahiro Endo; Ryosuke Kohno; Shinichi Minohara; Kazutoshi Kohno; Hiroshi Asakura; Hideaki Fujiwara; Kenya Murase
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Paper Abstract

The conventional respiratory-gated CT scan technique includes anatomic motion induced artifacts due to the low temporal resolution. They are a significant source of error in radiotherapy treatment planning for the thorax and upper abdomen. Temporal resolution and image quality are important factors to minimize planning target volume margin due to the respiratory motion. To achieve high temporal resolution and high signal-to-noise ratio, we developed a respiratory gated segment reconstruction algorithm and adapted it to Feldkamp-Davis-Kress algorithm (FDK) with a 256-detector row CT. The 256-detector row CT could scan approximately 100 mm in the cranio-caudal direction with 0.5 mm slice thickness in one rotation. Data acquisition for the RS-FDK relies on the assistance of the respiratory sensing system by a cine scan mode (table remains stationary). We evaluated RS-FDK in phantom study with the 256-detector row CT and compared it with full scan (FS-FDK) and HS-FDK results with regard to volume accuracy and image noise, and finally adapted the RS-FDK to an animal study. The RS-FDK gave a more accurate volume than the others and it had the same signal-to-noise ratio as the FS-FDK. In the animal study, the RS-FDK visualized the clearest edges of the liver and pulmonary vessels of all the algorithms. In conclusion, the RS-FDK algorithm has a capability of high temporal resolution and high signal-to-noise ratio. Therefore it will be useful when combined with new radiotherapy techniques including image guided radiation therapy (IGRT) and 4D radiation therapy.

Paper Details

Date Published: 20 April 2005
PDF: 11 pages
Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.596632
Show Author Affiliations
Shinichiro Mori, National Institute of Radiological Sciences (Japan)
Accelerator Engineering Corp. (Japan)
Masahiro Endo, National Institute of Radiological Sciences (Japan)
Ryosuke Kohno, National Institute of Radiological Sciences (Japan)
Shinichi Minohara, National Institute of Radiological Sciences (Japan)
Kazutoshi Kohno, Accelerator Engineering Corp. (Japan)
Hiroshi Asakura, Accelerator Engineering Corp. (Japan)
Hideaki Fujiwara, Osaka Univ. (Japan)
Kenya Murase, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 5745:
Medical Imaging 2005: Physics of Medical Imaging
Michael J. Flynn, Editor(s)

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