IBIC2012 - List of Keywords (heavy-ion)

Paper	Title	Other Keywords	Page
MOPB54	Development of the New Type MLIC with PMMA Plates and Graphite Electrodes	ion, high-voltage, detector, power-supply	194
	S. Iwata, C. Kobayashi, N.S. Shinozaki, A. Takubo AEC, Chiba, Japan S. Fukuda NIRS, Chiba-shi, Japan T. Kanai Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
	The MLIC (Multi-Layer Ionization Chamber) that has a lot of ionization chambers stacked in the depth direction is a useful detector for measuring the depth dose distribution (DDD). By using the MLIC, the measurement time and the amount of beam for dosimetry are drastically decreased. In HIMAC (Heavy-Ion Medical Accelerator in Chiba), the MLIC has been effectively used for QA (Quality Assurance) measurement of heavy-ion therapeutic beam since 2002. We are developing a new type MLIC that has electrodes made of graphite on the surface of the polymethyl-methacrylate (PMMA) plates for particle therapy. The purpose is to obtain the same results as the DDD in water. We will report on the progress of the development.

MOPB58	Beam Quality Ensuring Instruments at the Gunma University Heavy-ion Medical Center	ion, linac, synchrotron, controls	209
	E. Takeshita, T. Kanai, M. Kawashima, Y. Kubota, A. Matsumura, A. Saito, H. Shimada, M. Tashiro, K. Torikai, S. Yamada, K. Yusa Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
	Since the carbon beam based cancer therapy started at the Gunma University Heavy-ion Medical Center in the year 2010, the total number of treated patients increased to 306 by the end of fiscal 2011. This year, already 82 patients have been treated. In order to control the medical beam qualities, i.e., position, size and intensity of the beam, monitoring devices were mounted on the high-energy beam transport line. The beam position and size can be measured and tuned with a screen monitor, which consists of a fluorescent screen and a CCD camera. Just before starting the treatment, the operators check for a proper beam position by strip-line monitor measurements placed close to the iso center. The irradiation dose is controlled using two secondary electron emission monitors placed before the wobbling magnets. This dose monitor is helpful for high fluence of the beam because it's less affected by the recombination effect. In the conference, we would like to report on details of each monitoring device.

MOPB76	Evaluation of a Fluorescent Screen with a CCD System for Quality Assurance in Heavy-Ion Beam Scanning Irradiation System	ion, radiation, controls, background	249
	Y. Hara, T. Furukawa, T. Inaniwa, K. Mizushima, K. Noda, S. Sato, T. Shirai, E. Takeshita NIRS, Chiba-shi, Japan
	The precise heavy-ion therapy such as the scanning irradiation system necessitates the precise quality assurance (QA) procedures to verify the performance of therapeutic scanned ion beams. To evaluate the uniformity of the 2D field, radiographic film is used due to its high spatial resolution and suit for the measurements of the integral dose. However, this technique is time consuming. Thus, we developed the QA tool with high spatial resolution to verify accuracy of the lateral size, position and uniformity of scanned ion beams in clinical application at the HIMAC, which we called the QA-SCN. The QA-SCN consists of a fluorescent screen, a CCD camera, a mirror, camera controllers and a dark box to protect against surrounding light. In this paper, to evaluate the performance of the QA-SCN, we compared the results obtained by using it with the measurements by radiographic film performed in the same experimental conditions. Also, we verified several types of corrections about errors, e.g. background, vignetting, to distort the measurement results. As a result, we confirmed that the QA-SCN can be used as the system for QA procedures of therapeutic scanned ion beams.

Paper

Title

Other Keywords

Page

MOPB54

Development of the New Type MLIC with PMMA Plates and Graphite Electrodes

ion, high-voltage, detector, power-supply

194

S. Iwata, C. Kobayashi, N.S. Shinozaki, A. Takubo
AEC, Chiba, Japan
S. Fukuda
NIRS, Chiba-shi, Japan
T. Kanai
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan

The MLIC (Multi-Layer Ionization Chamber) that has a lot of ionization chambers stacked in the depth direction is a useful detector for measuring the depth dose distribution (DDD). By using the MLIC, the measurement time and the amount of beam for dosimetry are drastically decreased. In HIMAC (Heavy-Ion Medical Accelerator in Chiba), the MLIC has been effectively used for QA (Quality Assurance) measurement of heavy-ion therapeutic beam since 2002. We are developing a new type MLIC that has electrodes made of graphite on the surface of the polymethyl-methacrylate (PMMA) plates for particle therapy. The purpose is to obtain the same results as the DDD in water. We will report on the progress of the development.

MOPB58

Beam Quality Ensuring Instruments at the Gunma University Heavy-ion Medical Center

ion, linac, synchrotron, controls

209

E. Takeshita, T. Kanai, M. Kawashima, Y. Kubota, A. Matsumura, A. Saito, H. Shimada, M. Tashiro, K. Torikai, S. Yamada, K. Yusa
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan

Since the carbon beam based cancer therapy started at the Gunma University Heavy-ion Medical Center in the year 2010, the total number of treated patients increased to 306 by the end of fiscal 2011. This year, already 82 patients have been treated. In order to control the medical beam qualities, i.e., position, size and intensity of the beam, monitoring devices were mounted on the high-energy beam transport line. The beam position and size can be measured and tuned with a screen monitor, which consists of a fluorescent screen and a CCD camera. Just before starting the treatment, the operators check for a proper beam position by strip-line monitor measurements placed close to the iso center. The irradiation dose is controlled using two secondary electron emission monitors placed before the wobbling magnets. This dose monitor is helpful for high fluence of the beam because it's less affected by the recombination effect. In the conference, we would like to report on details of each monitoring device.

MOPB76

Evaluation of a Fluorescent Screen with a CCD System for Quality Assurance in Heavy-Ion Beam Scanning Irradiation System

ion, radiation, controls, background

249

Y. Hara, T. Furukawa, T. Inaniwa, K. Mizushima, K. Noda, S. Sato, T. Shirai, E. Takeshita
NIRS, Chiba-shi, Japan

The precise heavy-ion therapy such as the scanning irradiation system necessitates the precise quality assurance (QA) procedures to verify the performance of therapeutic scanned ion beams. To evaluate the uniformity of the 2D field, radiographic film is used due to its high spatial resolution and suit for the measurements of the integral dose. However, this technique is time consuming. Thus, we developed the QA tool with high spatial resolution to verify accuracy of the lateral size, position and uniformity of scanned ion beams in clinical application at the HIMAC, which we called the QA-SCN. The QA-SCN consists of a fluorescent screen, a CCD camera, a mirror, camera controllers and a dark box to protect against surrounding light. In this paper, to evaluate the performance of the QA-SCN, we compared the results obtained by using it with the measurements by radiographic film performed in the same experimental conditions. Also, we verified several types of corrections about errors, e.g. background, vignetting, to distort the measurement results. As a result, we confirmed that the QA-SCN can be used as the system for QA procedures of therapeutic scanned ion beams.