http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Y. Hara,T. Furukawa,K. Mizushima,S. Sato,T. Shirai,K. Noda,E. Takeshita 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional dosimetry system was developed for the quality assurance (QA) of therapeuticscanned ion beams at Heavy Ion Medical Accelerator in Chiba (HIMAC). This system consists of afluorescent screen and a charge-coupled device (CCD) camera. To evaluate the performance of thissystem, we carried out a few experiments concerning QA procedures. A verification of this systemwas also carried out by comparing the film dosimetry and the ionization chamber array. Also, weverified several types of corrections for errors, e.g., background and vignetting, that distort themeasurement results. As a result, we confirmed that this system could be used for QA proceduresof the therapeutic scanned ion beams.
Adjustment Procedure for Beam Alignment in Scanned Ion-Beam Therapy
Y. Saraya,E. Takeshita,T. Furukawa,Y. Hara,K. Mizushima,N. Saotome,R. Tansho,T. Shirai,K. Noda 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
Control of the beam position for three-dimensional pencil-beam scanning is important because the position accuracy of the beam significantly impacts the alignment of the irradiation field. To suppress this effect, we have developed a simple procedure for beamline tuning. At first, beamline tuning is performed with steering magnets and fluorescent screen monitors to converge the beam’s trajectory to a central orbit. Misalignment between the beam’s position and the reference axis is checked by using the verification system, which consists of a screen monitor and an acrylic phantom. If the beam position deviates from the reference axis, two pairs of steering magnets, which are placed on downstream of the beam transport line, will be corrected. These adjustments are iterated until the deviations for eleven energies of the beam are within 0.5 mm of the reference axis. To demonstrate the success of our procedure, we used our procedure to perform beam commissioning at the Kanagawa Cancer Center.
Beam Spot Imaging System Using a Fluorescent Screen for Carbon-ion Radiotherapy
K. Mizushima,E. Takeshita,T. Furukawa,Y. Hara,T. Shirai,K. Katagiri,K. Noda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional (2D) beam imaging system with a fluorescent intensifying screen and highspeedcharge-coupled device (CCD) camera was developed to observe the fluctuations of the beamposition and size. This system can perform imaging of the beam spot and the calculation of bothits position and size from the obtained image with a cycle-time of 20 ms. For quality assurance ofscanned carbon-ion therapy, we measured the stability of the unscanned-beam position and size byusing this system at the isocenter in a treatment room. We confirmed that the fluctuation rangesof its position and size were less than the tolerance for scanning irradiation.