Ra-needle equivalent dose destribution made by slit beam rotation therapy using X-ray of medical linear accelerator

Research Project

Project/Area Number	60870036
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	Radiation science
Research Institution	Hokkaido University
Principal Investigator	IRIE Goro Hokkaido University School of Medicine, Professor, 医学部, 教授 (30001788)
Co-Investigator(Kenkyū-buntansha)	TSUJII Hirohiko Hokkaido University School of Medicine, Associate Professor, 医学部, 助教授 (50088853) KAMADA Tadashi Hokkaido University Hospital, Instructor, 医学部付属病院, 助手 (90150242)
Project Period (FY)	1985 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥12,000,000 (Direct Cost: ¥12,000,000) Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000) Fiscal Year 1985: ¥11,000,000 (Direct Cost: ¥11,000,000)
Keywords	X-ray Slit beam / rotation irradiation / 小線源線量分布
Research Abstract	The result of this research proved that Ra-needle equivqlent dose distribution. Can be obtained by rotating irradiation of slited thin high energy X-ray of 10MV. Controlling the relation between rotation angleof irradiation head and guntry of the machine, dose distribution corresponding any direction of Ra-needle is prove to be available. The controlling unit for the above move-ment was developed in this research project. This irradiation showed better respons for a group of malignant glioma cases than usual flat irradiation. One of the short comming of this irradiation method is its time consumption by cutting down the X-ray beam by so narrow slit as narrower than size of X-ray focus. Discussion with technical staff of Toshiba Co. LTD. concluded it is technically possible to over-come the short comming by designing a new accelerator.