IBIC2015 - List of Authors (Saraya, Y.)

Paper	Title	Page
MOPB015	A Patient-Specific QA Procedure for Moving Target Irradiation in Scanned Ion Therapy	62
	Y. Hara, T. Furukawa, K. Mizushima, K. Noda, N. S. Saotome, Y. Saraya, T. Shirai, R. Tansho NIRS, Chiba-shi, Japan
	Three-dimensional (3D) pencil-beam scanning technique has been utilised since 2011 in NIRS-HIMAC. The beam delivery system and treatment planning software (TPS) require dosimetric patient-specific QA to check each individual plan. Any change in the scanned beams will result in a significant impact on the irradiation dose. Therefore, patient-specific QA for moving target irradiation requires additional procedure. In an additional QA for moving target irradiation, we placed a 2D ionization chamber on the PMMA plate tilted with respect to the beam axis. The PMMA plate was set on the stage of the moving phantom. The moving phantom was moved according to patient data. We measured the dose distribution for both the static target and the moving target. We compared the results for the moving target with those for the static targets by means of a gamma index analysis. In the additional patient-specific QA, the gamma analysis between the moving and static targets showed a good agreement. We confirmed that this new technique was a beneficial QA procedure for moving target irradiation.
	Poster MOPB015 [1.576 MB]
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MOPB016	Development of QA System for the Rotating Gantry for Carbon Ion Therapy at NIRS	66
	N. S. Saotome, T. Furukawa, Y. Hara, K. Mizushima, K. Noda, Y. Saraya, T. Shirai, R. Tansho NIRS, Chiba-shi, Japan
	At the National Institute of Radiological Sciences (NIRS), we have been developing the rotating-gantry system for carbon-ion radiotherapy. This system is equipped with a three-dimensional pencil beam scanning irradiation system. To ensure the treatment quality, calibration of the primary dose monitor, range check, dose rate check, machine safety check, and some mechanical tests should be performed efficiently. For this purpose, we have developed a measurement system dedicated for quality assurance (QA) of this gantry system. The ion beam's dose output was calibrated by measurement using an ionization chamber. A Farmer type ionization chamber was inserted into the center of a plastic water phantom. The thickness of the phantom could be changed so that it employs both calibration of the output at entrance and output checking at center of the irradiation field. The ranges of beams are verified using a CCD camera and a scintillator system. From the taken images, maximum gradient points are determined by some image processing and compared with reference data. In this paper, we describe consideration of the daily QA for the rotating-gantry.
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Paper

Title

Page

A Patient-Specific QA Procedure for Moving Target Irradiation in Scanned Ion Therapy

62

Y. Hara, T. Furukawa, K. Mizushima, K. Noda, N. S. Saotome, Y. Saraya, T. Shirai, R. Tansho
NIRS, Chiba-shi, Japan

Three-dimensional (3D) pencil-beam scanning technique has been utilised since 2011 in NIRS-HIMAC. The beam delivery system and treatment planning software (TPS) require dosimetric patient-specific QA to check each individual plan. Any change in the scanned beams will result in a significant impact on the irradiation dose. Therefore, patient-specific QA for moving target irradiation requires additional procedure. In an additional QA for moving target irradiation, we placed a 2D ionization chamber on the PMMA plate tilted with respect to the beam axis. The PMMA plate was set on the stage of the moving phantom. The moving phantom was moved according to patient data. We measured the dose distribution for both the static target and the moving target. We compared the results for the moving target with those for the static targets by means of a gamma index analysis. In the additional patient-specific QA, the gamma analysis between the moving and static targets showed a good agreement. We confirmed that this new technique was a beneficial QA procedure for moving target irradiation.

Poster MOPB015 [1.576 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

MOPB016

Development of QA System for the Rotating Gantry for Carbon Ion Therapy at NIRS

66

N. S. Saotome, T. Furukawa, Y. Hara, K. Mizushima, K. Noda, Y. Saraya, T. Shirai, R. Tansho
NIRS, Chiba-shi, Japan

At the National Institute of Radiological Sciences (NIRS), we have been developing the rotating-gantry system for carbon-ion radiotherapy. This system is equipped with a three-dimensional pencil beam scanning irradiation system. To ensure the treatment quality, calibration of the primary dose monitor, range check, dose rate check, machine safety check, and some mechanical tests should be performed efficiently. For this purpose, we have developed a measurement system dedicated for quality assurance (QA) of this gantry system. The ion beam's dose output was calibrated by measurement using an ionization chamber. A Farmer type ionization chamber was inserted into the center of a plastic water phantom. The thickness of the phantom could be changed so that it employs both calibration of the output at entrance and output checking at center of the irradiation field. The ranges of beams are verified using a CCD camera and a scintillator system. From the taken images, maximum gradient points are determined by some image processing and compared with reference data. In this paper, we describe consideration of the daily QA for the rotating-gantry.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)