2004 Fiscal Year Final Research Report Summary
Dynamic conical conformal radiotherapy using a C-arm mounted accelerator and its treatment planning software
| Project/Area Number |
14570839
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAGAWA Keiichi The University of Tokyo, Faculty of Medicine, Associate Professor, 医学部附属病院, 助教授 (80188896)
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| Co-Investigator(Kenkyū-buntansha) |
ONOGI Yuzo The University of Tokyo, Faculty of Medicine, Associate Professor, 医学部附属病院, 助教授 (90233593)
TERAHARA Atsuro The University of Toho, Radiology, Assistant Professor, 医学部附属病院, 助教授 (80237007)
TAGO Masao The University of Tokyo, Faculty of Medicine, Lecturer, 医学部附属病院, 講師 (50282520)
NAKAMURA Naoki The University of Tokyo, Faculty of Medicine, Research Associate, 医学部附属病院, 助手 (40359625)
NAKANISHI Tetsuya Mitsubishi Electric Corporation, Chief Researcher, 主任研究員
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| Project Period (FY) |
2002 – 2004
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| Keywords | C-arm linac / conformal radiotherapy / Dyconic CRT / 3D-CRT / RTP |
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| Research Abstract |
The aim of the study was to improve dose distribution with rotational conformal radiotherapy (RCRT) using a C-arm mounted accelerator. The linac head was designed to move along the C-arm with a maximum angle of 60 degrees (from a vertical position toward the gantry). Simultaneous rotation of the gantry creates a dynamic conical irradiation technique. Dynamic conical conformal radiation therapy (Dyconic CRT) was developed by combining the technique with continuous motion of multi-leaf collimator (MLC). Dose distributions were measured in phantoms using film densitometry and compared with conventional RCRT. Dose distributions in actual radiation therapy patients are also presented. Dyconic CRT actualized precise non-coplanar beam entry without table rotation. In addition, a specialized treatment planning software for Dyconic CRT was completed on a commercially available RTP computer. The measurements showed that three-dimensionally proportional dose gradient was achieved with Dyconic CRT, when compared to that with conventional RCRT. Dose in homogeneity in the sagittal direction with Dyconic CRT was compensated by use of 30-degree wedge. Drawback of RCRT in dose distribution was overcome with the present technique.
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